Intelligent control oxygen-enriched firing system and method for kiln
阅读说明：本技术 一种窑炉用智能控制富氧烧成系统及方法 (Intelligent control oxygen-enriched firing system and method for kiln ) 是由 张云峰 朱航 何森林 韦霆 杨正军 于 2020-04-29 设计创作，主要内容包括：本发明公开一种窑炉用智能控制富氧烧成系统,包括富氧系统、富氧燃烧器、测温分析系统、烧成专家优化系统及智能控制系统。本发明由专有富氧系统生产提供富氧,采用新型富氧燃烧器,根据窑炉系统不同煤粉种类、煤粉量及研磨粒度,由精确测温分析系统获取火焰形状及温度分布,结合窑炉现场所有实际热工参数及状态,通过烧成专家优化系统分析、预测判断及智能控制系统控制专有富氧系统智能调节、动态匹配,使窑炉烧成系统保持最佳运行状态,实现富氧燃烧器煤粉高效、稳定燃烧、减少煤粉用量,提高烧成物料品质,并有效降低NOx的生成和排放,同时可减少因操作人员调试经验和水平差异造成窑炉系统波动,保证窑炉系统的正常稳定运行。(The invention discloses an intelligent control oxygen-enriched burning system for a kiln, which comprises an oxygen-enriched system, an oxygen-enriched combustor, a temperature measurement analysis system, a burning expert optimization system and an intelligent control system. The invention provides oxygen enrichment by a special oxygen enrichment system, adopts a novel oxygen enrichment burner, obtains flame shape and temperature distribution by an accurate temperature measurement analysis system according to different pulverized coal types, pulverized coal amounts and grinding particle sizes of a kiln system, combines all actual thermal parameters and states on the site of the kiln, controls intelligent adjustment and dynamic matching of the special oxygen enrichment system by a burning expert optimization system analysis, prediction judgment and intelligent control system, enables a kiln burning system to keep the optimal operation state, realizes high-efficiency and stable combustion of the pulverized coal of the oxygen enrichment burner, reduces the pulverized coal amount, improves the quality of burning materials, effectively reduces generation and emission of NOx, simultaneously can reduce fluctuation of the kiln system caused by debugging experience and level difference of operators, and ensures normal and stable operation of the kiln system.)
1. An intelligent control oxygen-enriched burning system for a kiln is characterized by comprising an oxygen-enriched system, an oxygen-enriched burner, a temperature measurement analysis system, a burning expert optimization system and an intelligent control system,
the oxygen enrichment system can simultaneously produce a low-temperature medium-pressure oxygen enrichment product, a high-temperature low-pressure oxygen enrichment product and a high-temperature high-pressure oxygen enrichment product, and is respectively used for coal air feeding, rotational flow air and axial flow air of the oxygen enrichment combustor of the cement kiln;
the oxygen-enriched combustor is used for combusting pulverized coal and providing heat energy for a cement kiln firing system;
the temperature measurement analysis system is used for acquiring flame temperatures at different positions in the cement kiln in real time, processing the flame temperatures to obtain flame temperature distribution and shape data in the cement kiln, and sending the flame temperature distribution and shape data to the firing expert optimization system in real time;
the firing expert optimization system is used for receiving the flame temperature distribution and shape data in the cement kiln sent by the temperature measurement analysis system, evaluating and predicting the optimal firing state of the cement by combining with the on-site actual measurement data of the cement kiln, generating regulation and control instructions of the flow, pressure and purity of each oxygen-enriched product of the oxygen enrichment system and sending the regulation and control instructions to the intelligent control system;
and the intelligent control system receives a regulation and control instruction of the firing expert optimization system on the flow, pressure and purity of each oxygen-enriched product of the oxygen-enriched system, sends the regulation and control instruction to the oxygen-enriched system, and realizes the automatic regulation and matching of the oxygen-enriched system on related parameters in a pre-regulation mode.
2. The intelligent control oxygen-enriched combustion system for the kiln as claimed in claim 1, wherein the oxygen-enriched system comprises a compression module, a graded cold energy recovery pre-cooling module, a purification module, and a rectification module,
the compression module is used for filtering and compressing raw air;
the gradient cold energy recovery pre-cooling module is used for pre-cooling the compressed raw material air by using the cold energy of the rectification module; simultaneously recovering the heat energy of the compressed raw material air to obtain a high-temperature high-pressure oxygen-enriched product and a high-temperature low-pressure oxygen-enriched product which are respectively used for axial flow air and rotational flow air of the oxygen-enriched combustor of the cement kiln;
the purification module is used for purifying the precooled raw material air;
and the rectification module is used for rectifying the purified raw material air to obtain a low-temperature medium-pressure oxygen-enriched product which is used for supplying coal air to the cement kiln and providing cold energy for the gradient cold energy recovery pre-cooling module.
3. The intelligent oxygen-enriched combustion system for the kiln as recited in claim 2, wherein the compression module comprises a filter, a turbine air compressor,
the graded cold energy recovery pre-cooling module comprises a high-temperature heat energy recoverer, a water cooler and a low-temperature cold energy recoverer,
the purification module comprises a molecular sieve adsorber and an electric heater,
the rectification module comprises a main heat exchanger, a rectification tower, a condensation evaporator, a subcooler and a booster turboexpander,
the filter, the turbine air compressor, the high-temperature heat energy recoverer, the water cooler, the low-temperature cold energy recoverer, the molecular sieve adsorber, the electric heater and the supercharging end of the supercharging turboexpander are arranged outside the rectifying box, the main heat exchanger, the rectifying tower, the condensing evaporator, the subcooler and the supercharging turboexpander are arranged in the rectifying box, and the condensing evaporator is arranged above the rectifying tower;
the filter, the turbine air compressor, the high-temperature heat energy recoverer, the water cooler, the low-temperature cold energy recoverer, the molecular sieve adsorber and the main heat exchanger are sequentially connected, and the main heat exchanger is connected with a raw material air inlet at the bottom of the rectifying tower;
an oxygen-enriched liquid air outlet at the bottom of the rectifying tower is connected with a subcooler, the subcooler is connected with a condensing evaporator, a throttle valve is arranged on a connecting pipeline of the subcooler and the condensing evaporator, an oxygen-enriched air outlet of the condensing evaporator is connected with the subcooler, the subcooler is connected with a main heat exchanger, and an oxygen-enriched air reheating outlet of the main heat exchanger provides a low-temperature medium-pressure oxygen-enriched product for coal air supply of a cement kiln; the reheating outlet of the oxygen-enriched air part of the main heat exchanger is respectively connected to the boosting ends of a low-temperature cold energy recoverer and a boosting turbine expander, the low-temperature cold energy recoverer is connected with a high-temperature heat energy recoverer and then connected with a throttle valve so as to provide a high-temperature low-pressure oxygen-enriched product for cyclone air of an oxygen-enriched combustor of the cement kiln; the supercharging end of the supercharging turboexpander is connected with the high-temperature heat energy recoverer to provide a high-temperature high-pressure oxygen-enriched product for axial flow air of the oxygen-enriched combustor of the cement kiln;
a pressurized nitrogen outlet at the top of the rectifying tower is respectively connected with a condensation evaporator and a main heat exchanger, a liquid nitrogen outlet of the condensation evaporator is respectively connected with an external liquid nitrogen product storage tank and the top of the rectifying tower, and a throttle valve is arranged on a connecting pipeline between the liquid nitrogen outlet of the condensation evaporator and the external liquid nitrogen product storage tank; the hot nitrogen part reheating outlet of the main heat exchanger is connected with a booster expansion turbine, the booster expansion turbine is connected with a subcooler, the subcooler is connected with the main heat exchanger, the main heat exchanger provides low-temperature normal-pressure nitrogen which is respectively connected with an electric heater and a low-temperature cold energy recoverer, and the electric heater is connected with a molecular sieve adsorber; the low-temperature cold energy recoverer is connected with the high-temperature heat energy recoverer, and the high-temperature heat energy recoverer is connected with an external emptying pipeline.
4. The intelligent control oxygen-enriched combustion system for the kiln as claimed in claim 1, wherein the oxygen-enriched combustor is a sleeve combustor, and comprises a central ignition channel, a rotational flow air channel, an inner axial flow air channel, a pulverized coal air channel, an outer axial flow air channel and a cooling air channel;
the central ignition channel is arranged in the center of the burner, the rotational flow air channel is arranged between the central ignition channel and the inner axial flow air channel, the inner axial flow air channel is arranged on the outer ring of the rotational flow air channel, the pulverized coal air channel is arranged on the outer ring of the inner axial flow air channel, the outer axial flow air channel is arranged on the outer ring of the pulverized coal air channel, and the cooling air channel is arranged on the outer ring of the outer axial flow air channel.
5. An intelligent control oxygen-enriched combustion system for a kiln as claimed in claim 4, wherein the pulverized coal air passage is a zigzag passage comprising an inner layer and an outer layer, a plurality of axial serrations are uniformly arranged on the outer wall of the inner layer, a plurality of axial serrations are uniformly arranged on the inner wall of the outer layer in a matching manner, and during installation, the axial serrations of the outer wall of the inner layer and the axial serrations of the inner wall of the outer layer are staggered to form the zigzag passage; the outer wall of the inner layer is provided with a plurality of convex blocks for positioning and supporting when the inner layer and the outer layer are installed.
6. The intelligent control oxygen-enriched combustion system for the kiln as claimed in claim 1, wherein the temperature measurement analysis system comprises a temperature acquisition module, a data processing and control module, and a display module,
the temperature acquisition module is used for acquiring flame temperature data of different positions in the cement kiln in real time and sending the acquired data to the data processing and control module;
the data processing and controlling module is used for receiving the data transmitted by the temperature acquisition module, processing the data to obtain the temperature distribution and shape data of the flame in the kiln and transmitting the data to the burning expert optimizing system and the display module;
and the display module is used for displaying the temperature distribution and the shape of the flame in the cement kiln in real time.
7. The intelligent control oxygen-enriched combustion system for the kiln as claimed in claim 6, wherein the image acquisition module is an infrared high temperature thermometer.
8. The intelligent control oxygen-enriched combustion system for the kiln as claimed in claim 1, wherein the combustion expert optimization system is used for evaluating and predicting the optimal combustion state of the cement by monitoring the flame shape and temperature distribution in the cement kiln and combining the analysis, summarization and comparison of the thermal calibration data of approximately 200 cement kilns through the statistics, analysis and principle calculation of each measured data on site of the cement kiln and the analysis, summarization and comparison of the thermal calibration data of the cement kilns, so as to summarize the corresponding relation between the flame shape and temperature distribution and the oxygen-enriched flow, pressure and purity of the oxygen-enriched combustor, generate the regulation and control instruction of each oxygen-enriched product flow, pressure and purity of the oxygen-enriched system and send the regulation and control instruction to the intelligent control system.
9. The intelligent control oxygen-enriched combustion system for the kiln as claimed in claim 1, wherein the intelligent control system is respectively connected with the combustion expert optimization system and the oxygen-enriched system, receives the regulation and control instruction of the combustion expert optimization system on the flow, pressure and purity of each oxygen-enriched product of the oxygen-enriched system, and sends the regulation and control instruction to the oxygen-enriched system, and realizes the automatic regulation and matching of the oxygen-enriched system on the relevant parameters in a pre-regulation mode.
10. The method for intelligently controlling the oxygen-enriched combustion of the kiln by using the system as claimed in any one of claims 1 to 9 is characterized by comprising the following steps:
simultaneously producing a low-temperature medium-pressure oxygen-enriched product, a high-temperature low-pressure oxygen-enriched product and a high-temperature high-pressure oxygen-enriched product by using an oxygen-enriched system, wherein the low-temperature medium-pressure oxygen-enriched product, the high-temperature low-pressure oxygen-enriched product and the high-temperature high-pressure oxygen-enriched product are respectively used for coal air; wherein the low-temperature medium-pressure oxygen-enriched product contains 25-50% of O2The temperature is 12-20 ℃, and the pressure is 60-80 KPa; the high-temperature low-pressure oxygen-enriched product contains 25-50% of O2The temperature is 90-115 ℃, and the pressure is 20-35 KPa; the high-temperature high-pressure oxygen-enriched product contains 25-50% of O2The temperature is 90-115 ℃, and the pressure is 80-100 KPa;
the temperature measurement analysis system collects flame temperatures at different positions in the cement kiln in real time, processes the flame temperatures to obtain flame temperature distribution and shape data in the cement kiln, and sends the flame temperature distribution and shape data to the firing expert optimization system in real time;
the firing expert optimization system receives the flame temperature distribution and shape data in the cement kiln sent by the temperature measurement analysis system, evaluates and predicts the optimal firing state of the cement by combining with the on-site actual measurement data of the cement kiln, generates a regulation and control instruction for the flow, pressure and purity of each oxygen-enriched product of the oxygen enrichment system and sends the regulation and control instruction to the intelligent control system;
the intelligent control system receives the regulation and control instruction of the firing expert optimization system on the flow, pressure and purity of each oxygen-enriched product of the oxygen-enriched system, sends the regulation and control instruction to the oxygen-enriched system, and realizes the automatic regulation and matching of the oxygen-enriched system on related parameters in a pre-regulation mode.
Technical Field
The invention relates to the technical field of oxygen-enriched combustion, in particular to an intelligent control oxygen-enriched firing system and method for a kiln.
Background
Along with the general glide-down situation of the investment acceleration of domestic fixed assets, the domestic cement productivity is excessive and obvious, and under the background of reform at the supply side and capacity removal, the newly added cement production line is reduced year by year. The development of a novel dry cement process technology, a novel low-carbon cement production technology, an advanced energy-saving and emission-reducing technology for cement production and a complete set of technology and equipment for cement kiln cooperative treatment is a great trend for the development of the cement industry.
The coal proportion of the pulverized coal burner at the kiln head of the rotary kiln in the cement production line is 30-50%, the fuel cost is one of the main costs of cement clinker, on the premise of ensuring the cement yield and not increasing the extra production cost of a cement plant, the fuel combustion efficiency can be improved through the intelligently controlled kiln firing system organization, the coal consumption in the kiln combustion reaction process is reduced, the quality of materials fired by the kiln is improved, and the production and emission of NOx in the kiln smoke can be effectively controlled. Different kiln systems, coal dust types, the ground particle sizes, the control of various process parameters of a burner and the debugging experience and technical level of different operators can greatly influence the stability of the thermal regulation of a kiln firing system, so that insufficient coal dust combustion, increased coal consumption, reduced product quality and increased NOx emission amount are caused.
Disclosure of Invention
The invention aims to provide an intelligent control oxygen-enriched firing system and method for a kiln, which aim to overcome the defects in the prior art.
The invention adopts the following technical scheme:
an intelligent control oxygen-enriched burning system for a kiln comprises an oxygen-enriched system, an oxygen-enriched burner, a temperature measurement analysis system, a burning expert optimization system and an intelligent control system,
the oxygen enrichment system can simultaneously produce a low-temperature medium-pressure oxygen enrichment product, a high-temperature low-pressure oxygen enrichment product and a high-temperature high-pressure oxygen enrichment product, and is respectively used for coal air feeding, rotational flow air and axial flow air of the oxygen enrichment combustor of the cement kiln;
the oxygen-enriched combustor is used for combusting pulverized coal and providing heat energy for a cement kiln firing system;
the temperature measurement analysis system is used for acquiring flame temperatures at different positions in the cement kiln in real time, processing the flame temperatures to obtain flame temperature distribution and shape data in the cement kiln, and sending the flame temperature distribution and shape data to the firing expert optimization system in real time;
the firing expert optimization system is used for receiving the flame temperature distribution and shape data in the cement kiln sent by the temperature measurement analysis system, evaluating and predicting the optimal firing state of the cement by combining with the on-site actual measurement data of the cement kiln, generating regulation and control instructions of the flow, pressure and purity of each oxygen-enriched product of the oxygen enrichment system and sending the regulation and control instructions to the intelligent control system;
and the intelligent control system receives a regulation and control instruction of the firing expert optimization system on the flow, pressure and purity of each oxygen-enriched product of the oxygen-enriched system, sends the regulation and control instruction to the oxygen-enriched system, and realizes the automatic regulation and matching of the oxygen-enriched system on related parameters in a pre-regulation mode.
Further, the oxygen enrichment system comprises a compression module, a gradient cold energy recovery pre-cooling module, a purification module and a rectification module,
the compression module is used for filtering and compressing raw air;
the gradient cold energy recovery pre-cooling module is used for pre-cooling the compressed raw material air by using the cold energy of the rectification module; simultaneously recovering the heat energy of the compressed raw material air to obtain a high-temperature high-pressure oxygen-enriched product and a high-temperature low-pressure oxygen-enriched product which are respectively used for axial flow air and rotational flow air of the oxygen-enriched combustor of the cement kiln;
the purification module is used for purifying the precooled raw material air;
and the rectification module is used for rectifying the purified raw material air to obtain a low-temperature medium-pressure oxygen-enriched product which is used for supplying coal air to the cement kiln and providing cold energy for the gradient cold energy recovery pre-cooling module.
Further, the compression module comprises a filter and a turbine air compressor,
the gradient cold energy recovery pre-cooling module comprises a high-temperature heat energy recoverer, a water cooler and a low-temperature cold energy recoverer, the purification module comprises a molecular sieve adsorber and an electric heater,
the rectification module comprises a main heat exchanger, a rectification tower, a condensation evaporator, a subcooler and a booster turboexpander,
the filter, the turbine air compressor, the high-temperature heat energy recoverer, the water cooler, the low-temperature cold energy recoverer, the molecular sieve adsorber, the electric heater and the supercharging end of the supercharging turboexpander are arranged outside the rectifying box, the main heat exchanger, the rectifying tower, the condensing evaporator, the subcooler and the supercharging turboexpander are arranged in the rectifying box, and the condensing evaporator is arranged above the rectifying tower;
the filter, the turbine air compressor, the high-temperature heat energy recoverer, the water cooler, the low-temperature cold energy recoverer, the molecular sieve adsorber and the main heat exchanger are sequentially connected, and the main heat exchanger is connected with a raw material air inlet at the bottom of the rectifying tower;
an oxygen-enriched liquid air outlet at the bottom of the rectifying tower is connected with a subcooler, the subcooler is connected with a condensing evaporator, a throttle valve is arranged on a connecting pipeline of the subcooler and the condensing evaporator, an oxygen-enriched air outlet of the condensing evaporator is connected with the subcooler, the subcooler is connected with a main heat exchanger, and an oxygen-enriched air reheating outlet of the main heat exchanger provides a low-temperature medium-pressure oxygen-enriched product for coal air supply of a cement kiln; the reheating outlet of the oxygen-enriched air part of the main heat exchanger is respectively connected to the boosting ends of a low-temperature cold energy recoverer and a boosting turbine expander, the low-temperature cold energy recoverer is connected with a high-temperature heat energy recoverer and then connected with a throttle valve so as to provide a high-temperature low-pressure oxygen-enriched product for cyclone air of an oxygen-enriched combustor of the cement kiln; the supercharging end of the supercharging turboexpander is connected with the high-temperature heat energy recoverer to provide a high-temperature high-pressure oxygen-enriched product for axial flow air of the oxygen-enriched combustor of the cement kiln;
a pressurized nitrogen outlet at the top of the rectifying tower is respectively connected with a condensation evaporator and a main heat exchanger, a liquid nitrogen outlet of the condensation evaporator is respectively connected with an external liquid nitrogen product storage tank and the top of the rectifying tower, and a throttle valve is arranged on a connecting pipeline between the liquid nitrogen outlet of the condensation evaporator and the external liquid nitrogen product storage tank; the hot nitrogen part reheating outlet of the main heat exchanger is connected with a booster expansion turbine, the booster expansion turbine is connected with a subcooler, the subcooler is connected with the main heat exchanger, the main heat exchanger provides low-temperature normal-pressure nitrogen which is respectively connected with an electric heater and a low-temperature cold energy recoverer, and the electric heater is connected with a molecular sieve adsorber; the low-temperature cold energy recoverer is connected with the high-temperature heat energy recoverer, and the high-temperature heat energy recoverer is connected with an external emptying pipeline.
Furthermore, the oxygen-enriched combustor is a sleeve-type combustor and comprises a central ignition channel, a rotational flow air channel, an inner axial flow air channel, a pulverized coal air channel, an outer axial flow air channel and a cooling air channel;
the central ignition channel is arranged in the center of the burner, the rotational flow air channel is arranged between the central ignition channel and the inner axial flow air channel, the inner axial flow air channel is arranged on the outer ring of the rotational flow air channel, the pulverized coal air channel is arranged on the outer ring of the inner axial flow air channel, the outer axial flow air channel is arranged on the outer ring of the pulverized coal air channel, and the cooling air channel is arranged on the outer ring of the outer axial flow air channel.
Furthermore, the pulverized coal air channel is a zigzag channel and comprises an inner layer and an outer layer, a plurality of axial sawteeth are uniformly arranged on the outer wall of the inner layer, a plurality of axial sawteeth are uniformly arranged on the inner wall of the outer layer in a matched mode, and during installation, the axial sawteeth on the outer wall of the inner layer and the axial sawteeth on the inner wall of the outer layer are staggered to form a zigzag channel; the outer wall of the inner layer is provided with a plurality of convex blocks for positioning and supporting when the inner layer and the outer layer are installed.
Furthermore, the temperature measurement analysis system comprises a temperature acquisition module, a data processing and control module and a display module,
the temperature acquisition module is used for acquiring flame temperature data of different positions in the cement kiln in real time and sending the acquired data to the data processing and control module;
the data processing and controlling module is used for receiving the data transmitted by the temperature acquisition module, processing the data to obtain the temperature distribution and shape data of the flame in the kiln and transmitting the data to the burning expert optimizing system and the display module;
and the display module is used for displaying the temperature distribution and the shape of the flame in the cement kiln in real time.
Further, the image acquisition module is an infrared high-temperature thermometer.
Furthermore, the firing expert optimization system realizes the assessment and prediction of the optimal firing state of the cement by monitoring the flame shape and temperature distribution in the cement kiln and summarizing the corresponding relation between the flame shape and temperature distribution and the oxygen-enriched flow, pressure and purity of the oxygen-enriched combustor through the statistics, analysis and principle calculation of each measured data on site of the cement kiln and the analysis, summarization and comparison of nearly 200 pieces of thermal calibration data of the cement kiln, generates the regulation and control instructions of each oxygen-enriched product flow, pressure and purity of the oxygen-enriched system and sends the regulation and control instructions to the intelligent control system.
Furthermore, the intelligent control system is respectively connected with the firing expert optimization system and the oxygen enrichment system, receives the regulation and control instruction of the firing expert optimization system on the flow, pressure and purity of each oxygen enrichment product of the oxygen enrichment system, sends the regulation and control instruction to the oxygen enrichment system, and realizes the automatic regulation and matching of the oxygen enrichment system on relevant parameters in a pre-regulation mode.
The method for intelligently controlling oxygen-enriched sintering by utilizing the system comprises the following steps:
simultaneously producing a low-temperature medium-pressure oxygen-enriched product, a high-temperature low-pressure oxygen-enriched product and a high-temperature high-pressure oxygen-enriched product by using an oxygen-enriched system, wherein the low-temperature medium-pressure oxygen-enriched product, the high-temperature low-pressure oxygen-enriched product and the high-temperature high-pressure oxygen-enriched product are respectively used for; wherein the low-temperature medium-pressure oxygen-enriched product contains 25-50% of O2The temperature is 12-20 ℃, and the pressure is 60-80 KPa; the high-temperature low-pressure oxygen-enriched product contains 25-50% of O2The temperature is 90-115 ℃, and the pressure is 20-35 KPa; the high-temperature high-pressure oxygen-enriched product contains 25-50% of O2The temperature is 90-115 ℃, and the pressure is 80-100 KPa;
the temperature measurement analysis system collects flame temperatures at different positions in the cement kiln in real time, processes the flame temperatures to obtain flame temperature distribution and shape data in the cement kiln, and sends the flame temperature distribution and shape data to the firing expert optimization system in real time;
the firing expert optimization system receives the flame temperature distribution and shape data in the cement kiln sent by the temperature measurement analysis system, evaluates and predicts the optimal firing state of the cement by combining with the on-site actual measurement data of the cement kiln, generates a regulation and control instruction for the flow, pressure and purity of each oxygen-enriched product of the oxygen enrichment system and sends the regulation and control instruction to the intelligent control system;
the intelligent control system receives the regulation and control instruction of the firing expert optimization system on the flow, pressure and purity of each oxygen-enriched product of the oxygen-enriched system, sends the regulation and control instruction to the oxygen-enriched system, and realizes the automatic regulation and matching of the oxygen-enriched system on related parameters in a pre-regulation mode.
The invention has the beneficial effects that:
1. the invention provides oxygen enrichment by a special oxygen enrichment system, adopts a novel oxygen enrichment burner, obtains flame shape and temperature distribution by an accurate temperature measurement analysis system according to different pulverized coal types, pulverized coal amounts and grinding particle sizes of a kiln system, combines all actual thermal parameters and states on the site of the kiln, controls intelligent adjustment and dynamic matching of the special oxygen enrichment system by a burning expert optimization system analysis, prediction judgment and intelligent control system, enables a kiln burning system to keep the optimal operation state, realizes high-efficiency and stable pulverized coal combustion of the oxygen enrichment burner, reduces the pulverized coal amount, improves the quality of burning materials, effectively reduces generation and emission of NOx, and simultaneously can reduce fluctuation of the kiln system caused by debugging experience and level difference of operators and ensure normal and stable operation of the kiln system.
2. The special oxygen enrichment system can simultaneously produce three strands of oxygen enrichment products of different types, one strand is a low-temperature medium-pressure oxygen enrichment product and is used for coal air supply of a cement kiln, the temperature of the oxygen enrichment product is low, safe conveying of pulverized coal is facilitated, the oxygen component content is high, and efficient combustion of the pulverized coal is promoted; the other two streams are high-temperature low-pressure oxygen-enriched products and high-temperature high-pressure oxygen-enriched products which are respectively used for rotational flow air and axial flow air (inner axial flow air and outer axial flow air) of the oxygen-enriched combustor of the cement kiln. The high-temperature high-pressure oxygen-enriched product used as axial flow air has high pressure, improves oxygen for combustion of pulverized coal, wraps the pulverized coal, enables the pulverized coal air to continuously maintain the jet flow direction to move forward to complete combustion after entering the rotary kiln, and maintains the stability of flame; the high-temperature low-pressure oxygen-enriched product used as cyclone air can absorb high-temperature secondary air in the kiln, can control the shape of flame expansion according to the difference of the angles of the cyclones, and can properly adjust the cyclone angle according to the difference of coal types and the change of kiln load so as to meet the optimal cyclone entrainment strength. The two oxygen-enriched products obtain high temperature through the gradient cold energy recovery pre-cooling module, and the gradient cold energy recovery pre-cooling module replaces the traditional pre-cooling module, so that the temperature of raw material air entering the purification module is reduced, and the power consumption is reduced; meanwhile, the high temperature generated by the compression module is recovered, a high-temperature oxygen-enriched product is provided for the oxygen-enriched combustor, the heat value of a kiln system is increased, the burning rate of pulverized coal is promoted, the burnout rate of the pulverized coal is improved, the coal consumption of cement kiln production is reduced, the cost is saved, and meanwhile, the exhaust emission is reduced. The pressure, the flow and the oxygen component concentration of each oxygen-enriched product of the oxygen-enriched system can be automatically adjusted, the pulverized coal is uniformly and stably conveyed, the pulverized coal combustion flame is kept stable, the flame temperature is concentrated, and the temperature field distribution is reasonable.
3. The high pressure of the high-pressure oxygen enrichment of the special oxygen enrichment system is obtained by utilizing the expansion work of the booster turboexpander for boosting, so that the energy utilization rate is improved, the energy consumption is saved, meanwhile, the temperature is increased, the heat value of a cement kiln system can be increased, and the coal powder consumption is reduced. And the system pressure of the special oxygen enrichment system is greatly reduced, and the pressure discharge of the compression module is reduced, so that the energy consumption is greatly reduced.
4. The novel oxygen-enriched combustor adopts a sleeve type combustor, sequentially comprises a central ignition channel, a rotational flow air channel, an inner axial flow air channel, a pulverized coal air channel, an outer axial flow air channel and a cooling air channel from inside to outside, and has the advantages of compact structure, simplicity in operation, stability in combustion, high combustion efficiency and the like. The central ignition channel is used for ignition when the cement kiln is started. The cyclone air channel is arranged between the central ignition channel and the inner axial flow air channel, is mainly used for sucking high-temperature secondary air in the rotary kiln, and can control the shape of flame expansion according to different angles of the cyclone. The cyclone body plays a certain supporting role, the initial angle of the cyclone is set to be 45 degrees, and the cyclone angle can be properly adjusted according to different coal types and the change of the load of the rotary kiln so as to meet the optimal cyclone entrainment strength. The rotational flow air channel is provided by high-temperature low-pressure oxygen enrichment produced by the oxygen enrichment system. The inner axial flow air channel is arranged on the outer ring of the rotational flow air channel, and mainly has the functions of providing oxygen required by the initial combustion of the pulverized coal, increasing the amount of oxygen mixed with the pulverized coal air, maintaining the rigidity of flame to a certain degree and also maintaining the stability of the flame. The outer axial flow air channel is arranged on the outer side of the pulverized coal air channel and mainly provides oxygen for the initial combustion stage of pulverized coal, and pulverized coal can be wrapped from the outer side, so that pulverized coal air can continuously maintain the jet flow direction to move forward to complete combustion after entering the rotary kiln, and flame is prevented from spreading outwards. And the design of the double-axial-flow air channel can reduce the scouring of the burner head of the backflow area and reduce the abrasion of the burner head. The inner axial flow air channel and the outer axial flow air channel are provided by high-pressure high-temperature oxygen enrichment produced by the oxygen enrichment system. The two oxygen-enriched products used by the rotational flow air channel, the inner axial flow air channel and the outer axial flow air channel have high temperature, so that the heat value of a kiln system can be increased, the coal consumption of cement kiln production is reduced, the cost is saved, and the exhaust emission is reduced. The coal dust air channel preferably adopts a zigzag channel, compared with the annular coal air channel of the coal dust burner of the traditional cement kiln, the zigzag channel can increase the turbulence degree of coal dust airflow, and the circumference of the channel is increased under the condition of the same flow area, and compared with the increase of the contact area of the coal dust and oxygen of other channels, when the coal dust air passes through the zigzag ring, the zigzag channel is beneficial to better mixing of the coal dust and the oxygen in other channels, the combustion intensity and the burnout degree of the coal dust are enhanced, and the efficient combustion of the coal dust is realized. The pulverized coal air channel is conveyed by low-temperature medium-pressure oxygen enrichment produced by the oxygen enrichment system, and the temperature of the oxygen enrichment product is low, so that safe conveying of pulverized coal is facilitated. And cooling air is arranged on the outermost side, so that the head part of the burner is prevented from being over-heated, and the safe and stable operation of the burner is ensured.
5. The accurate temperature measurement analysis system can uninterruptedly monitor the pulverized coal combustion state in the cement kiln in real time for 24 hours, record the flame temperature distribution and the shape, transmit the data to the burning expert optimization system, and display the flame temperature distribution, the flame temperature shape and the like on the display in a graphic form, so that a process operator can master the production condition at any time according to the working condition.
6. The invention discloses a firing expert optimizing system which realizes the evaluation and prediction of the optimized firing state of a cement firing system by monitoring the flame shape and temperature distribution in a cement kiln and generating regulation and control instructions of the flow, pressure and purity of each oxygen-enriched product of an oxygen-enriched system and sending the regulation and control instructions to an intelligent control system through the statistics, analysis and principle calculation of each measured data on the cement kiln site and the analysis, summarization and comparison of nearly 200 pieces of thermal calibration data of the cement kiln, realizes the automatic regulation and matching of the oxygen-enriched system to related parameters through a pre-regulation mode, flexibly regulates the shape, length and fire strength of the fire of pulverized coal, ensures that the firing system of the kiln keeps the optimal operation state, realizes the high-efficiency and stable combustion of the pulverized coal of an oxygen-enriched combustor, reduces the pulverized coal consumption, improves the quality of fired materials, and effectively reduces the generation and emission of NOx, meanwhile, the fluctuation of the kiln system caused by debugging experience and level difference of operators can be reduced, and the normal and stable operation of the kiln system is ensured.
Drawings
FIG. 1 is a schematic structural diagram of an intelligent control oxygen-enriched combustion system for a kiln of the invention.
FIG. 2 is a schematic diagram of the oxygen enrichment system of the present invention.
FIG. 3 is a sectional view of the main structure of the oxycombustion burner of the present invention.
FIG. 4 is an axial schematic view of the oxycombustion burner head of the present invention.
FIG. 5 is a schematic view of the configuration of the oxycombustion burner head of the present invention.
FIG. 6 is a schematic diagram of the inner layer structure of the pulverized coal air passage of the oxygen-enriched burner of the present invention.
FIG. 7 is a schematic diagram of the outer layer structure of the pulverized coal air passage of the oxygen-enriched burner of the present invention.
FIG. 8 is a schematic view of a thermometric analysis system according to the present invention.
Detailed Description
The invention is explained in more detail below with reference to exemplary embodiments and the accompanying drawings. The following examples are provided only for illustrating the present invention and are not intended to limit the scope of the present invention.
An intelligent control oxygen-enriched burning system for a kiln is shown in figure 1 and comprises an oxygen-enriched system, an oxygen-enriched combustor, a temperature measurement analysis system, a burning expert optimization system and an intelligent control system.
The oxygen enrichment system can simultaneously produce low-temperature medium-pressure oxygen enrichment products, high-temperature low-pressure oxygen enrichment products and high-temperature high-pressure oxygen enrichment products, and is respectively used for coal feeding air, rotational flow air and axial flow air (outer axial flow air and inner axial flow air) of a cement kiln.
As shown in fig. 2, the oxygen enrichment system includes a compression module, a gradient cold energy recovery pre-cooling module, a purification module, and a rectification module.
And the compression module is used for filtering and compressing the raw air.
The gradient cold energy recovery pre-cooling module is used for pre-cooling the compressed raw material air by using the cold energy of the rectification module; meanwhile, the heat energy of the compressed raw material air is recovered, and a high-temperature high-pressure oxygen-enriched product and a high-temperature low-pressure oxygen-enriched product are obtained and are respectively used for axial flow air and rotational flow air of the oxygen-enriched combustor of the cement kiln.
And the purification module is used for purifying the precooled raw material air.
And the rectification module is used for rectifying the purified raw material air to obtain a low-temperature medium-pressure oxygen-enriched product which is used for supplying coal air to the cement kiln and providing cold energy for the gradient cold energy recovery pre-cooling module.
The compression module comprises a filter 101, a turbine air compressor 102.
The gradient cold energy recovery pre-cooling module comprises a high-temperature heat energy recoverer 103, a water cooler 104 and a low-temperature cold energy recoverer 105.
The purification module comprises a molecular sieve adsorber 106, an electric heater 107.
The rectification module comprises a main heat exchanger 108, a rectification tower 109, a condensation evaporator 110, a subcooler 111 and a booster turboexpander 112.
The filter 101, the turbine air compressor 102, the high-temperature heat energy recoverer 103, the water cooler 104, the low-temperature cold energy recoverer 105, the molecular sieve adsorber 106, the electric heater 107 and the pressurizing end of the pressurizing turboexpander 112 are arranged outside the rectifying box, the main heat exchanger 108, the rectifying tower 109, the condensing evaporator 110, the subcooler 111 and the pressurizing turboexpander 112 are arranged in the rectifying box, and the condensing evaporator 110 is arranged on the rectifying tower 109.
The filter 101, the turbine air compressor 102, the high-temperature heat energy recoverer 103, the water cooler 104, the low-temperature cold energy recoverer 105, the molecular sieve adsorber 106 and the main heat exchanger 108 are sequentially connected, and the main heat exchanger 108 is connected with a raw material air inlet at the bottom of the rectifying tower 109;
an oxygen-enriched liquid air outlet at the bottom of the rectifying tower 109 is connected with a subcooler 111, the subcooler 111 is connected with a condensing evaporator 110, a throttle valve is arranged on a connecting pipeline of the subcooler 111 and the condensing evaporator 110, an oxygen-enriched air outlet of the condensing evaporator 110 is connected with the subcooler 111, the subcooler 111 is connected with a main heat exchanger 108, and an oxygen-enriched air reheating outlet of the main heat exchanger 108 provides a low-temperature medium-pressure oxygen-enriched product for coal air supply of a cement kiln; the reheating outlet of the oxygen-enriched air part of the main heat exchanger 108 is respectively connected to the pressurization ends of a low-temperature cold energy recoverer 105 and a pressurization turbine expander 112, the low-temperature cold energy recoverer 105 is connected with a high-temperature heat energy recoverer 103, and then is connected with a throttle valve to provide a high-temperature low-pressure oxygen-enriched product for cyclone air of the oxygen-enriched combustor of the cement kiln; the supercharging end of the supercharging turbine expander 112 is connected with the high-temperature heat energy recoverer 103 to provide a high-temperature high-pressure oxygen-enriched product for axial flow air of the oxygen-enriched combustor of the cement kiln;
a pressurized nitrogen outlet at the top of the rectifying tower 109 is respectively connected with a condensation evaporator 110 and a main heat exchanger 108, a liquid nitrogen outlet of the condensation evaporator 110 is respectively connected with an external liquid nitrogen product storage tank and the top of the rectifying tower 109, and a throttle valve is arranged on a connecting pipeline between the liquid nitrogen outlet of the condensation evaporator 110 and the external liquid nitrogen product storage tank; the hot nitrogen partial reheat outlet of the main heat exchanger 108 is connected with a booster turboexpander 112, the booster turboexpander 112 is connected with a subcooler 111, the subcooler 111 is connected with the main heat exchanger 108, the main heat exchanger 108 provides low-temperature normal-pressure nitrogen which is respectively connected with an electric heater 107 and a low-temperature cold energy recoverer 105, and the electric heater 107 is connected with a molecular sieve adsorber 106; the low-temperature cold energy recoverer 105 is connected with the high-temperature heat energy recoverer 103, and the high-temperature heat energy recoverer 103 is connected with an external emptying pipeline.
The preparation method comprises the following steps:
firstly, raw material air enters a turbine air compressor 102 after dust and mechanical impurities are filtered out by a filter 101, and the raw material air is compressed to 0.35-0.4 MPa;
step two, the compressed raw material air enters a high-temperature heat energy recoverer 103, exchanges heat with normal-temperature medium-pressure oxygen enrichment, normal-temperature normal-pressure nitrogen and high-pressure oxygen enrichment of a rectification module from a low-temperature heat energy recoverer 105, is heated and throttled by a throttle valve to serve as a high-temperature low-pressure oxygen enrichment product, and contains 25-50% of O2The temperature is 90-115 ℃, the pressure is 20-35KPa, and the cyclone air is used for the cyclone air of the oxygen-enriched combustor of the cement kiln; the high-pressure oxygen-enriched gas is heated to be used as a high-temperature high-pressure oxygen-enriched product containing 25 to 50 percent of O2The temperature is 90-115 ℃, the pressure is 80-100KPa, and the air is used for axial flow air of an oxygen-enriched combustor of the cement kiln; heating nitrogen at normal temperature and normal pressure, then emptying, and cooling the raw material air from the temperature of 100-125 ℃ to the temperature of 65-75 ℃; the cooled raw material air enters a water cooler 104 to be continuously cooled to about 40 ℃, then enters a low-temperature cold energy recoverer 105 to exchange heat with part of first low-temperature medium-pressure oxygen enrichment and part of low-temperature normal-pressure nitrogen of a rectification module, the first low-temperature medium-pressure oxygen enrichment is heated and then enters a high-temperature heat energy recoverer 103 for heat exchange with normal-temperature medium-pressure oxygen enrichment, the low-temperature normal-pressure nitrogen is heated and then enters the high-temperature heat energy recoverer 103 for heat exchange with normal-temperature normal-pressure nitrogen, and the raw material air is further cooled to 15-20 ℃;
step three, purifying the precooled raw material air in a molecular sieve adsorber 106 to remove moisture and CO2、C2H2And the purified raw air is used as instrument air, and the rest part of the purified raw air enters the main heat exchanger 108 to be cooled to saturation and has certain moisture content and then enters the bottom of the rectifying tower 109 to participate in rectification;
step four, the air is rectified by the rectifying tower 109 and then separated into oxygen-enriched liquid air and nitrogen with pressure (18-25KPa), the oxygen-enriched liquid air is supercooled by the subcooler 111 and throttled by the throttle valve, then enters the condensing evaporator 110 to exchange heat with the nitrogen with pressure, the oxygen-enriched liquid air is vaporized into oxygen-enriched air, 25% -50% of O is extracted from the top of the rectifying tower 1092Oxygen-enriched air with the pressure of 60-80KPa enters a main heat exchanger 108 after being reheated by a cooler 111 and is divided into two parts, one part is reheated to 16-20 ℃ and then is used as a low-temperature medium-pressure oxygen-enriched product containing 25 percent of ion-enriched air50％O2The temperature is 16-20 ℃, the pressure is 60-80KPa, and the air is used for feeding coal air to a cement kiln; the other strand of the heat exchanger is reheated to 5-10 ℃, and then is divided into two parts by first low-temperature medium-pressure oxygen enrichment, and one part of the heat exchanger sequentially enters a low-temperature cold energy recoverer 105 and a high-temperature heat energy recoverer 103 for heat exchange; the other part is pressurized to 80-100KPa pressure and 60-70 ℃ by the pressurizing end of the pressurizing turboexpander 112, and enters the high-temperature heat energy recoverer 103 for heat exchange by high-pressure oxygen enrichment;
step five, a part of nitrogen with pressure enters a condensation evaporator 110 to exchange heat with the oxygen-enriched liquid air, the nitrogen with pressure is condensed into liquid nitrogen, one part of the liquid nitrogen is taken as a liquid nitrogen product and is discharged out of a rectifying box, and the other part of the liquid nitrogen is introduced into the top of a rectifying tower 109 to be taken as reflux liquid; the other part of nitrogen with pressure enters a main heat exchanger 108 and is introduced into a booster turbine expander 112 for expansion and refrigeration after being partially reheated, the expanded normal-pressure nitrogen is divided into two parts by low-temperature normal-pressure nitrogen after being reheated by a cooler 111 and the main heat exchanger 108, one part of the expanded normal-pressure nitrogen is used as regeneration gas and is introduced into a molecular sieve adsorber 106 after being heated by an electric heater 107 of a purification module, and the other part of the expanded normal-pressure nitrogen sequentially enters a low-temperature cold energy recoverer 105 and a high-temperature heat energy.
The oxygen-enriched combustor is used for pulverized coal combustion and provides heat energy for a cement kiln firing system. The different types, amounts and grinding particle sizes of the pulverized coal can affect the operation state of a kiln firing system.
The oxygen-enriched combustor is a sleeve-type combustor and comprises a central ignition channel 1, a rotational flow air channel 2, an inner axial flow air channel 3, a pulverized coal air channel 4, an outer axial flow air channel 5 and a cooling air channel 6 as shown in figures 3-5.
The central ignition channel 1 is arranged in the center of the burner and is used for ignition when the rotary kiln is started.
The rotational flow air channel 2 is arranged between the central ignition channel 1 and the inner axial flow air channel 3. The cyclone air channel 2 is mainly used for sucking high-temperature secondary air in the rotary kiln, and the shape of flame expansion can be controlled according to different angles of the cyclone. The cyclone body plays a certain supporting role, the initial angle of the cyclone can be set to be 45 degrees, and the cyclone angle can be properly adjusted according to different coal types and the change of the load of the rotary kiln so as to meet the optimal cyclone entrainment strength.
The inner axial flow air channel 3 is arranged on the outer ring of the rotational flow air channel 2, the outlet of the inner axial flow air channel 3 is in a circular hole shape, and the number of the outlets in the circular hole shape is generally 4-48. The inner axial flow air channel 3 mainly has the functions of providing oxygen required by the initial combustion of the pulverized coal, increasing the oxygen mixed with the pulverized coal air, maintaining the rigidity of flame to a certain degree and also maintaining the stability of the flame.
The pulverized coal air channel 4 is arranged at the outer ring of the inner axial flow air channel 3, and preferably, the pulverized coal air channel 4 is a zigzag channel. The zigzag channel can be realized by the following structure: as shown in fig. 6 and 7, the pulverized coal air passage 4 comprises an inner layer and an outer layer, a plurality of axial sawteeth are uniformly arranged on the outer wall of the inner layer, a plurality of axial sawteeth are uniformly arranged on the inner wall of the outer layer in a matched manner, and during installation, the axial sawteeth of the outer wall of the inner layer and the axial sawteeth of the inner wall of the outer layer are staggered to form a sawteeth passage. Compared with the annular pulverized coal air channel of the conventional cement kiln pulverized coal burner, the zigzag channel can increase the turbulence degree of pulverized coal air, the perimeter of the channel is increased under the condition of the same flow area, which is equivalent to increase the contact area of pulverized coal and oxygen of other channels, and when pulverized coal air passes through the zigzag ring, the pulverized coal burner is beneficial to better mixing of the pulverized coal and oxygen in other channels, so that the efficient combustion of the pulverized coal is realized. Preferably, a plurality of projections are arranged on the outer wall of the inner layer and used for positioning and supporting when the inner layer and the outer layer are installed.
The outer axial flow air channel 5 is arranged on the outer ring of the pulverized coal air channel 4, the outlet of the outer axial flow air channel 5 is in a circular hole shape, and the number of the outlets in the circular hole shape is generally 4-48. The outer axial flow air channel 5 mainly provides oxygen for the initial stage of pulverized coal combustion, and can wrap pulverized coal from the outer side, so that pulverized coal air can continuously maintain the jet flow direction to move forward to complete combustion after entering the rotary kiln, and flame is prevented from spreading outwards.
The cooling air channel 6 is arranged at the outer ring of the outer axial flow air channel 5 and is an arc annular gap-shaped channel. The cooling air channel 6 prevents the head part of the burner from being over-heated, and ensures the safe and stable operation of the burner.
The central ignition channel 1, the rotational flow air channel 2, the inner axial flow air channel 3, the pulverized coal air channel 4 and the outer axial flow air channel 5 can be made of stainless steel or ceramic, and the cooling air channel 6 can be made of stainless steel. When the pulverized coal air passage 4 is made of stainless steel, the rear ends of the axial sawteeth on the inner outer wall of the pulverized coal air passage 4 and the rear ends of the axial sawteeth on the outer inner wall are respectively provided with matched ceramic sawteeth so as to reduce the abrasion to the pulverized coal air passage 4.
And the temperature measurement analysis system is used for acquiring flame temperatures at different positions in the cement kiln in real time, processing the flame temperatures to obtain the flame temperature distribution and shape data in the cement kiln, and sending the flame temperature distribution and shape data to the firing expert optimization system in real time.
As shown in fig. 8, the thermometric analysis system includes a temperature acquisition module, a data processing and control module, and a display module.
And the temperature acquisition module is used for acquiring flame temperature data of different positions in the cement kiln in real time and sending the acquired data to the data processing and control module. Preferably, the temperature acquisition module is an infrared high-temperature thermometer.
And the data processing and control module is used for receiving the data transmitted by the temperature acquisition module, processing the data to obtain the temperature distribution and shape data of the flame in the kiln and sending the data to the burning expert optimization system and the display module.
And the display module is used for displaying the temperature distribution and the shape of the flame in the cement kiln in real time.
The temperature measurement analysis system can uninterruptedly monitor the pulverized coal combustion state in the cement kiln in real time for 24 hours, record the flame temperature distribution and the shape, transmit the data to the burning expert optimization system, and display the flame temperature distribution, the flame temperature shape and the like on a display in a graphic form, so that a process operator can master the production condition at any time according to the working condition.
And the firing expert optimization system is used for receiving the flame temperature distribution and shape data in the cement kiln sent by the temperature measurement analysis system, evaluating and predicting the optimal firing state of the cement by combining with the field actual measurement data of the cement kiln, generating a regulation and control instruction for the flow, pressure and purity of each oxygen-enriched product of the oxygen enrichment system and sending the regulation and control instruction to the intelligent control system.
Specifically, the optimization system of the firing expert realizes the assessment and prediction of the optimized firing state of the cement by monitoring the flame shape and temperature distribution in the cement kiln and summarizing the corresponding relation between the flame shape and temperature distribution and the oxygen-enriched flow, pressure and purity of the oxygen-enriched combustor through the statistics, analysis and principle calculation of each measured data on site of the cement kiln and the analysis, summarization and comparison of nearly 200 pieces of thermal calibration data of the cement kiln, generates the regulation and control instructions of the flow, pressure and purity of each oxygen-enriched product of the oxygen-enriched system and sends the regulation and control instructions to the intelligent control system.
The intelligent control system is respectively connected with the firing expert optimization system and the oxygen enrichment system, receives the regulation and control instructions of the firing expert optimization system on the flow, pressure and purity of each oxygen enrichment product of the oxygen enrichment system and sends the regulation and control instructions to the oxygen enrichment system, the automatic regulation and matching of the oxygen enrichment system on related parameters are realized in a pre-regulation mode, the shape, length and fire intensity of pulverized coal combustion flame are flexibly regulated, the firing system of the kiln is kept in the optimal operation state, the pulverized coal of the oxygen enrichment burner is efficiently and stably combusted, the pulverized coal consumption is reduced, the quality of fired materials is improved, the generation and emission of NOx are effectively reduced, meanwhile, the fluctuation of the kiln system caused by the debugging experience and level difference of operators is reduced, and the normal and stable operation of the.
The method for intelligently controlling oxygen-enriched sintering by utilizing the system comprises the following steps:
simultaneously producing a low-temperature medium-pressure oxygen-enriched product, a high-temperature low-pressure oxygen-enriched product and a high-temperature high-pressure oxygen-enriched product by using an oxygen enrichment system, wherein the low-temperature medium-pressure oxygen-enriched product, the high-temperature low-pressure oxygen-enriched product and the high-temperature high-pressure oxygen-enriched product are respectively used for coal feeding air, rotational flow air and axial; wherein the low-temperature medium-pressure oxygen-enriched product contains 25-50% of O2The temperature is 12-20 ℃, and the pressure is 60-80 KPa; the high-temperature low-pressure oxygen-enriched product contains 25-50% of O2The temperature is 90-115 ℃, and the pressure is 20-35 KPa; the high-temperature high-pressure oxygen-enriched product contains 25-50% of O2The temperature is 90-115 ℃, and the pressure is 80-100 KPa;
the temperature measurement analysis system collects flame temperature data of different positions in the cement kiln in real time, processes the data to obtain the flame temperature distribution and shape data in the cement kiln, and sends the data to the firing expert optimization system in real time;
the firing expert optimization system receives the flame temperature distribution and shape data in the cement kiln sent by the temperature measurement analysis system, evaluates and predicts the optimal firing state of the cement by combining with the on-site actual measurement data of the cement kiln, generates a regulation and control instruction for the flow, pressure and purity of each oxygen-enriched product of the oxygen enrichment system and sends the regulation and control instruction to the intelligent control system;
the intelligent control system receives the regulation and control instruction of the firing expert optimization system on the flow, pressure and purity of each oxygen-enriched product of the oxygen-enriched system, sends the regulation and control instruction to the oxygen-enriched system, and realizes the automatic regulation and matching of the oxygen-enriched system on related parameters in a pre-regulation mode.
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