阅读说明：本技术 富氧空气燃烧系统 (Oxygen-enriched air combustion system ) 是由 杨勇 魏孟军 张开翼 张义华 蔡律律 李定波 温栋 于 2021-10-20 设计创作，主要内容包括：本发明提供了富氧空气燃烧系统,系统包括：富氧空气供给模块、燃料供给模块、助燃空气供给模块、预混燃烧装置、燃烧炉和控制器；所述富氧空气供给模块、所述燃料供给模块和所述助燃空气供给模块连接所述预混燃烧装置的进料口,所述预混燃烧装置的出料口连接所述燃烧炉；所述控制器用于控制富氧空气供给模块产生并向所述预混燃烧装置提供富氧空气、控制所述燃料供给模块向所述预混燃烧装置提供燃料、控制所述助燃空气供给模块向所述预混燃烧装置提供助燃空气；所述预混燃烧装置用于混合所述富氧空气、所述燃料及所述助燃空气并将混合物输送至所述燃烧炉进行燃烧。本发明的方案能够提高燃烧效率和燃料利用率。(The invention provides an oxygen-enriched air combustion system, comprising: the system comprises an oxygen-enriched air supply module, a fuel supply module, a combustion-supporting air supply module, a premixed combustion device, a combustion furnace and a controller; the oxygen-enriched air supply module, the fuel supply module and the combustion air supply module are connected with a feed inlet of the premixed combustion device, and a discharge outlet of the premixed combustion device is connected with the combustion furnace; the controller is used for controlling the oxygen-enriched air supply module to generate and provide oxygen-enriched air for the premixed combustion device, controlling the fuel supply module to provide fuel for the premixed combustion device, and controlling the combustion-supporting air supply module to provide combustion-supporting air for the premixed combustion device; the premixed combustion device is used for mixing the oxygen-enriched air, the fuel and the combustion air and conveying the mixture to the combustion furnace for combustion. The scheme of the invention can improve the combustion efficiency and the fuel utilization rate.)

1. An oxygen-enriched air combustion system, comprising:

the system comprises an oxygen-enriched air supply module, a fuel supply module, a combustion-supporting air supply module, a premixed combustion device, a combustion furnace and a controller; the oxygen-enriched air supply module, the fuel supply module and the combustion air supply module are connected with a feed inlet of the premixed combustion device, and a discharge outlet of the premixed combustion device is connected with the combustion furnace; the controller is used for controlling the oxygen-enriched air supply module to generate and provide oxygen-enriched air for the premixed combustion device, controlling the fuel supply module to provide fuel for the premixed combustion device, and controlling the combustion-supporting air supply module to provide combustion-supporting air for the premixed combustion device; the premixed combustion device is used for mixing the oxygen-enriched air, the fuel and the combustion air and conveying the mixture to the combustion furnace for combustion.

2. An enriched air combustion system in accordance with claim 1,

the oxygen-enriched air supply module includes: the oxygen-enriched air generating device, the oxygen-enriched air control valve and the oxygen-enriched air flow measuring device; the oxygen-enriched air producing device is connected with the oxygen-enriched air control valve, the oxygen-enriched air control valve is connected with the air flow measuring device, and the air flow measuring device is connected with the premixed combustion device; the oxygen-enriched air producing device is used for producing oxygen-enriched air; the oxygen-enriched air control valve is used for controlling the flow of oxygen-enriched air under the control of the controller; the oxygen-enriched air flow measuring device is used for feeding back the flow of the oxygen-enriched air to the controller in real time.

3. An oxycombustion air combustion system according to claim 2, further comprising: a temperature measuring device; the temperature measuring device is arranged in the combustion furnace; the temperature measuring device is used for detecting the combustion temperature in the combustion furnace and feeding back the combustion temperature to the controller.

4. An enriched air combustion system in accordance with claim 3,

the fuel supply module includes: a fuel supply, fuel control valves and fuel gauges; the fuel supply is connected with the fuel control valve, the fuel control valve is connected with the fuel measurer, and the fuel measurer is connected with the premixed combustion device; the fuel supplier is used for supplying fuel to the premixing combustion device; the fuel control valve is used for controlling the amount of fuel entering the premixing combustion device under the control of the controller; the fuel measurer is used for detecting the fuel quantity entering the premixing combustion device and feeding the fuel quantity back to the controller;

the controller is also used for receiving feedback results of the fuel measurer and the oxygen-enriched air flow measuring device and controlling the oxygen-enriched air control valve according to a preset volume flow ratio.

5. An oxycombustion system according to claim 1, further comprising: the device comprises a flue, a flue gas oxygen content measuring device and a chimney; the flue is connected with the combustion furnace and the flue gas oxygen content measuring device, and the flue gas oxygen content measuring device is connected with the chimney; the flue gas oxygen content measuring device is used for detecting the oxygen content of tail flue gas discharged by the combustion furnace through the flue and feeding the oxygen content back to the controller.

6. An enriched air combustion system in accordance with claim 1,

the combustion air supply module comprises: a blower, a damper and an air measuring device; the air feeder is connected with the air door, the air door is connected with the air measuring device, and the air measuring device is connected with the premixed combustion device; the blower is used for generating the combustion air, and the air door is used for controlling the flow of the combustion air entering the premixing combustion device under the control of the controller; the air measuring device is used for detecting the flow of the combustion air entering the premixing combustion device and feeding the flow back to the controller;

and the controller is used for controlling the air door according to the feedback result of the air measuring device.

7. An enriched air combustion system in accordance with claim 2,

the oxygen-enriched air producing device produces oxygen-enriched air through a screw vacuum pump or a water ring vacuum pump, and the oxygen concentration of the oxygen-enriched air is 28-32%.

8. An enriched air combustion system in accordance with claim 4,

the controller is used for controlling the fuel control valve to increase the opening degree when the feedback result of the temperature measuring device is low temperature; and when the feedback result of the temperature measuring device is overtemperature, controlling the fuel control valve to reduce the opening.

9. An enriched air combustion system in accordance with claim 1,

the premix combustion apparatus comprises at least one premix burner.

10. An enriched air combustion system in accordance with claim 3,

the temperature measuring device comprises at least one measuring point.

Technical Field

The invention relates to the technical field of industrial kilns, in particular to an oxygen-enriched air combustion system.

Background

Combustion is a process in which oxygen in the air participates in fuel oxidation, releasing light and heat at the same time. During the combustion operation of the industrial kiln, the volume content of oxygen in the air is about 21 percent, namely the oxygen which really participates in the combustion occupies one fifth of the total amount of the air, and the rest nitrogen and inert gas can not support combustion and can carry away a large amount of heat energy in the combustion process, thereby seriously affecting the thermal efficiency of the industrial kiln.

At present, in order to improve the thermal efficiency of a kiln, the combustion intensity of fuel is improved, the burnout speed of the fuel is increased, and the heat release efficiency is improved by adopting an oxygen-enriched combustion-supporting method, however, the currently used oxygen-enriched combustion method cannot realize the accurate control of a fuel valve and a combustion-supporting air valve, the combustion stability is poor, and the utilization rate of the fuel is low.

Disclosure of Invention

The embodiment of the invention provides an oxygen-enriched air combustion system which can improve the combustion efficiency and the fuel utilization rate.

According to an aspect of the present invention, there is provided an oxy-air combustion system comprising:

the system comprises an oxygen-enriched air supply module, a fuel supply module, a combustion-supporting air supply module, a premixed combustion device, a combustion furnace and a controller; the oxygen-enriched air supply module, the fuel supply module and the combustion air supply module are connected with a feed inlet of the premixed combustion device, and a discharge outlet of the premixed combustion device is connected with the combustion furnace; the controller is used for controlling the oxygen-enriched air supply module to generate and provide oxygen-enriched air for the premixed combustion device, controlling the fuel supply module to provide fuel for the premixed combustion device, and controlling the combustion-supporting air supply module to provide combustion-supporting air for the premixed combustion device; the premixed combustion device is used for mixing the oxygen-enriched air, the fuel and the combustion air and conveying the mixture to the combustion furnace for combustion.

Optionally, the oxygen-enriched air supply module comprises: the oxygen-enriched air generating device, the oxygen-enriched air control valve and the oxygen-enriched air flow measuring device; the oxygen-enriched air producing device is connected with the oxygen-enriched air control valve, the oxygen-enriched air control valve is connected with the air flow measuring device, and the air flow measuring device is connected with the premixed combustion device; the oxygen-enriched air producing device is used for producing oxygen-enriched air; the oxygen-enriched air control valve is used for controlling the flow of oxygen-enriched air under the control of the controller; the oxygen-enriched air flow measuring device is used for feeding back the flow of the oxygen-enriched air to the controller in real time.

Optionally, the oxygen-enriched air combustion system further comprises: a temperature measuring device; the temperature measuring device is arranged in the combustion furnace; the temperature measuring device is used for detecting the combustion temperature in the combustion furnace and feeding back the combustion temperature to the controller.

Optionally, the fuel supply module comprises: a fuel supply, fuel control valves and fuel gauges; the fuel supply is connected with the fuel control valve, the fuel control valve is connected with the fuel measurer, and the fuel measurer is connected with the premixed combustion device; the fuel supplier is used for supplying fuel to the premixing combustion device; the fuel control valve is used for controlling the amount of fuel entering the premixing combustion device under the control of the controller; the fuel measurer is used for detecting the fuel quantity entering the premixing combustion device and feeding the fuel quantity back to the controller; the controller is also used for receiving feedback results of the fuel measurer and the oxygen-enriched air flow measuring device and controlling the oxygen-enriched air control valve according to a preset volume flow ratio.

Optionally, the oxygen-enriched air combustion system further comprises: the device comprises a flue, a flue gas oxygen content measuring device and a chimney; the flue is connected with the combustion furnace and the flue gas oxygen content measuring device, and the flue gas oxygen content measuring device is connected with the chimney; the flue gas oxygen content measuring device is used for detecting the oxygen content of tail flue gas discharged by the combustion furnace through the flue and feeding the oxygen content back to the controller.

Optionally, the combustion air supply module comprises: a blower, a damper and an air measuring device; the air feeder is connected with the air door, the air door is connected with the air measuring device, and the air measuring device is connected with the premixed combustion device; the blower is used for generating the combustion air, and the air door is used for controlling the flow of the combustion air entering the premixing combustion device under the control of the controller; the air measuring device is used for detecting the flow of the combustion air entering the premixing combustion device and feeding the flow back to the controller;

and the controller is used for controlling the air door according to the feedback result of the air measuring device.

Optionally, the oxygen-enriched air producing device generates oxygen-enriched air through a screw vacuum pump or a water ring vacuum pump, and the oxygen concentration of the oxygen-enriched air is 28% -32%.

Optionally, the controller is configured to control the fuel control valve to increase the opening degree when the feedback result of the temperature measuring device is low temperature; and when the feedback result of the temperature measuring device is overtemperature, controlling the fuel control valve to reduce the opening.

Optionally, the premix burner apparatus comprises at least one premix burner.

Optionally, the temperature measuring device comprises at least one measuring point.

The embodiment of the invention provides an oxygen-enriched air combustion system, which realizes the control of a fuel valve, a combustion-supporting air valve and an oxygen-enriched air control valve through a controller, adopts accurate measurement and accurate control, ensures the efficient and stable combustion of the oxygen-enriched air combustion system, and reduces the fuel quantity. And the combustion intensity of the fuel is enhanced, the burnout speed of the fuel is accelerated and the heat release efficiency is improved through oxygen-enriched combustion supporting.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of an oxycombustion system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of another oxycombustion system provided by an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.

Combustion is a process in which oxygen in the air participates in fuel oxidation, releasing light and heat at the same time. The air contains 21% by volume of oxygen and 78% nitrogen, and further contains a very small amount of inert gas. The oxygen which really participates in the combustion is only used for filling the total amount of the air 1/5, and a large amount of nitrogen and inert gas can not assist combustion and can take away a large amount of heat energy in the combustion process, so that the heat efficiency of the industrial furnace is severely limited. Especially, when the temperature at the outlet of the kiln is more than 300 ℃, the heat loss of the discharged smoke is obviously increased. With the trend of international energy supply and the increasing energy price, many developed countries invest a lot of manpower and material resources to research oxygen enrichment technology, and focus on applying the oxygen enrichment technology to industrial furnaces for supporting combustion and saving energy. In western industrial countries, oxygen-rich combustion-supporting technology is called "resource creation technology". The use of oxygen enrichment in the kiln will, in addition to reducing heat losses by reducing the content of unwanted gases, also radically improve the distribution of the fuel and the combustion conditions inside the furnace. The oxygen-enriched combustion-supporting can enhance the combustion intensity of the fuel, accelerate the burnout speed of the fuel, improve the heat release efficiency and have obvious energy-saving and environment-friendly benefits.

At present, various oxygen-enriched combustion systems exist in the industrial field, but the oxygen-enriched combustion systems are only used in specific fields, and the application range is not large. Generally, methods for producing oxygen-enriched gas by oxyfuel combustion include a low-temperature air separation method, a pressure swing adsorption method and a membrane separation method. The oxygen concentration of oxygen-enriched air prepared by low-temperature air separation and pressure swing adsorption is high, but the consumed electric quantity is large; in both cases, the fuel cost of energy savings is not sufficient to offset the electricity costs of producing oxygen-enriched air. In the last decade, a membrane oxygen generation system has made great progress, but the current oxygen-enriched combustion system lacks accurate control over the whole combustion system, and lacks accurate measurement of fuel flow, oxygen-enriched air flow, combustion air and oxygen content of a tail flue, so that accurate control over a fuel valve and a combustion air valve is difficult to realize, energy conservation is difficult to realize stably for a long time, and the stability of a combustion process is poor.

At present, in order to improve the thermal efficiency of a kiln, the combustion intensity of fuel is improved, the burnout speed of the fuel is increased, and the heat release efficiency is improved by adopting an oxygen-enriched combustion-supporting method, however, the currently used oxygen-enriched combustion method cannot realize the accurate control of a fuel valve and a combustion-supporting air valve, the combustion stability is poor, and the utilization rate of the fuel is low.

The oxygen-enriched air combustion system provided by the embodiments of the invention is described in detail in the following with reference to the attached drawings.

As shown in FIG. 1, an embodiment of the present invention provides an oxygen-enriched air combustion system, including:

an oxygen-enriched air supply module 110, a fuel supply module 120, a combustion air supply module 130, a premix burner apparatus 140, a burner 150, and a controller 160; the oxygen-enriched air supply module 110, the fuel supply module 120 and the combustion air supply module 130 are connected with the feed inlet of the premixed combustion device 140, and the discharge outlet of the premixed combustion device 140 is connected with the combustion furnace 150; the controller 160 is configured to control the oxygen-enriched air supply module 110 to generate and provide oxygen-enriched air to the premix burner apparatus 140, control the fuel supply module 120 to provide fuel to the premix burner apparatus 140, and control the combustion air supply module 130 to provide combustion air to the premix burner apparatus 140; the premix burner apparatus 140 is used to mix oxygen-enriched air, fuel and combustion air and deliver the mixture to the burner 150 for combustion.

The embodiment of the invention provides an oxygen-enriched air combustion system, which realizes the control of a fuel valve, a combustion-supporting air valve and an oxygen-enriched air control valve through a controller, adopts accurate measurement and accurate control, ensures the efficient and stable combustion of the oxygen-enriched air combustion system, and reduces the fuel quantity. And the combustion intensity of the fuel is enhanced, the burnout speed of the fuel is accelerated and the heat release efficiency is improved through oxygen-enriched combustion supporting.

In one embodiment of the present invention, as shown in FIG. 2, an oxy-air combustion system includes: an oxygen-enriched air producing device 4, an oxygen-enriched air control valve 5 and an oxygen-enriched air flow measuring device 6; the oxygen-enriched air producing device 4 is connected with the oxygen-enriched air control valve 5, the oxygen-enriched air control valve 5 is connected with the air flow measuring device 6, and the air flow measuring device 6 is connected with the premixed combustion device 10; the oxygen-enriched air producing device 4 is used for generating oxygen-enriched air; the oxygen-enriched air control valve 5 is used for controlling the flow of the oxygen-enriched air under the control of the controller 16; the oxygen-enriched air flow measuring device 6 is used for feeding back the flow of the oxygen-enriched air to the controller 16 in real time.

In an embodiment of the present invention, as shown in fig. 2, the oxy-air combustion system further includes: a temperature measuring device 12; the temperature measuring device 12 is installed in the combustion furnace 11; the temperature measuring device 12 is used for detecting the combustion temperature in the combustion furnace 11 and feeding back to the controller 16.

In an embodiment of the present invention, as shown in fig. 2, the fuel supply module includes: a fuel supplier 1, a fuel control valve 2, and a fuel gauge 3; the fuel supplier 1 is connected with the fuel control valve 2, the fuel control valve 2 is connected with the fuel measurer 3, and the fuel measurer 3 is connected with the premixed combustion device 10; the fuel supplier 1 is used for supplying fuel to the premix burner apparatus 10; the fuel control valve 2 is used for controlling the amount of fuel entering the premix combustion apparatus 10 under the control of the controller 16; the fuel measurer 3 is used for detecting the amount of fuel entering the premixing combustion device 10 and feeding the detected amount of fuel back to the controller 16;

the controller 16 is further configured to receive feedback results of the fuel gauge 3 and the oxygen-enriched air flow rate measuring device 6, and control the oxygen-enriched air control valve 5 according to a preset volume flow rate ratio.

In an embodiment of the present invention, as shown in fig. 2, the oxy-air combustion system further includes: a flue 13, a flue gas oxygen content measuring device 14 and a chimney 15; the flue 13 is connected with the combustion furnace 11 and the flue gas oxygen content measuring device 14, and the flue gas oxygen content measuring device 14 is connected with the chimney 15; the flue gas oxygen content measuring device 14 is used for detecting the oxygen content of tail flue gas discharged from the combustion furnace 11 through the flue 13 and feeding the oxygen content back to the controller 16.

In an embodiment of the present invention, as shown in fig. 2, the combustion air supply module includes: a blower 7, a damper 8, and an air measuring device 9; the blower 7 is connected with the air door 8, the air door 8 is connected with the air measuring device 9, and the air measuring device 9 is connected with the premixed combustion device 10; the blower 7 is used for generating the combustion air, and the damper 8 is used for controlling the flow rate of the combustion air entering the premixing combustion device 10 under the control of the controller 16; the air measuring device 9 is used for detecting the flow of the combustion air entering the premix burner 10 and feeding the flow back to the controller 16;

and the controller 16 is used for controlling the air door 8 according to the feedback result of the air measuring device 9.

In an embodiment of the present invention, as shown in fig. 2, the controller 16 is configured to control the fuel control valve 2 to increase the opening degree when the feedback result of the temperature measuring device 12 is a low temperature; when the feedback result of the temperature measuring device 12 is an over-temperature, the fuel control valve 2 is controlled to decrease the opening degree.

Specifically, a front-end pipeline of the premixed combustion system is connected with an oxygen-enriched air making device, and an oxygen-enriched air control valve and an oxygen-enriched air flow measuring device are sequentially connected behind the oxygen-enriched air making device; a fuel control valve and a fuel measurer are connected behind the fuel supplier; the fuel passing through the fuel gauge is premixed with the enriched air passing through the enriched air flow measuring device before entering the premixed combustion device. And part of the oxygen-enriched air and the fuel are premixed and then combusted, so that the uniform mixing of the fuel and the air is ensured, and the combustion efficiency is further ensured.

The premixed combustion device is connected with a combustion-supporting air pipeline, and combustion-supporting air sequentially enters the premixed combustion device through the air feeder, the air door (8) and the air measuring device; the premixed combustion device is connected with the inlet of the combustion furnace. The fuel combustion needs most of oxygen or comes from combustion air, and the quantity of the combustion air is accurately controlled through the air door, so that the oxygen content of flue gas is ensured to be within a target range.

A temperature measuring device is arranged in the combustion furnace; by measuring the temperature in the combustion furnace and the temperature required by the process in real time, if the temperature is insufficient, a large fuel control valve is opened; if the temperature is over-temperature, the fuel control valve will be closed. Therefore, the control of the amount of fuel depends on the deviation of the measured value of the temperature inside the combustion furnace from the target required for the process, and the control is performed according to the deviation.

The outlet of the combustion furnace is connected with the flue and the chimney; a smoke oxygen content measuring device is arranged in the flue; real-time measurement signals of the fuel measurement device, the oxygen-enriched air flow measurement device, the air measurement device, the flue gas oxygen content measurement device and the temperature measurement device are sent to the controller; the controller outputs control signals through calculation to control the opening of the fuel control valve, the oxygen-enriched air control valve and the air door.

And controlling the volume flow ratio of the oxygen-enriched air flow measuring device to the fuel measuring device in a standard state to be kept between 0.8 and 1.5 through an internal control algorithm. Therefore, the opening of the fuel control valve is determined according to the deviation of the temperature of the combustion furnace required by the process and the measured value, so that the fuel flow is controlled; and determining the flow of the oxygen-enriched air according to the proportional relation, and further realizing control by controlling the oxygen-enriched air control valve.

The oxygen content of the tail flue gas measured by the flue gas oxygen content measuring device is controlled to be kept at 2% -4% through an internal control algorithm, and when the content deviation is large, the combustion air amount is accurately controlled by controlling the air door

Oxygen boosting system gas device chooses for use vacuum membrane method oxygen boosting system gas device, its characterized in that: the mode of generating vacuum adopts a screw vacuum pump or a water ring vacuum pump; the oxygen concentration of the oxygen-enriched air generated by the method is between 28 and 32 percent. The premixing combustion device connected with the burner comprises one or more premixing burners; the internally disposed temperature measuring device contains one or more measuring points.

The characteristics of this embodiment are: the front end pipeline of the premixing combustion device is connected with a vacuum membrane oxygen-enriched gas making device, and the flow of oxygen-enriched air and combustible gas is kept in a certain proportion by a controller control valve; the air excess coefficient is ensured to be in a certain range through the measurement of the oxygen content of the tail flue, so that the heat loss of the exhaust smoke is controlled.

It should be noted that not all steps and modules in the above flows and system structure diagrams are necessary, and some steps or modules may be omitted according to actual needs. The execution order of the steps is not fixed and can be adjusted as required. The system structure described in the above embodiments may be a physical structure or a logical structure, that is, some modules may be implemented by the same physical entity, or some modules may be implemented by a plurality of physical entities, or some components in a plurality of independent devices may be implemented together.

In the above embodiments, the hardware unit may be implemented mechanically or electrically. For example, a hardware element may comprise permanently dedicated circuitry or logic (such as a dedicated processor, FPGA or ASIC) to perform the corresponding operations. The hardware elements may also comprise programmable logic or circuitry, such as a general purpose processor or other programmable processor, that may be temporarily configured by software to perform the corresponding operations. The specific implementation (mechanical, or dedicated permanent, or temporarily set) may be determined based on cost and time considerations.

While the invention has been shown and described in detail in the drawings and in the preferred embodiments, the invention is not limited to the embodiments disclosed, and those skilled in the art will appreciate that various combinations of code auditing means in the various embodiments described above may be employed to obtain further embodiments of the invention, which are also within the scope of the invention.