阅读说明：本技术 一种基于渗滤液浓缩液雾化干燥技术的自动控制系统 (Automatic control system based on concentrated solution atomization drying technology of percolate ) 是由 雷钦平 司景忠 雷东 曾贤琼 岑振兴 张栩聪 郑雪艳 詹爱平 李立亚 张鹏 吴崇 于 2021-07-28 设计创作，主要内容包括：本发明涉及一种基于渗滤液浓缩液雾化干燥技术的自动控制系统,属于垃圾处理技术领域。该系统包括：进料单元、燃烧单元、尾气处理单元、干燥塔、固气分离单元、热量回收系统、汽水分离单元及控制单元；所述控制单元包括传感器、执行部件、控制器和上位机；所述传感器包括温度计、压力计、液位计和流量计；传感器用于各部件的温度、压力、液位或流量信号,并将采集的信号上传给控制器和上位机；上位机用于设定各部件的温度及压力限值；控制器用于比较传感器采集的信号与上位机设定的信号,并输出控制信号,对应控制执行部件的工作。本发明能在设定的温度、压力环境条件下稳定运行,且大大提高了渗滤液处理的效率和质量。(The invention relates to an automatic control system based on an infiltration liquid concentrated solution atomization drying technology, and belongs to the technical field of garbage treatment. The system comprises: the system comprises a feeding unit, a combustion unit, a tail gas treatment unit, a drying tower, a solid-gas separation unit, a heat recovery system, a steam-water separation unit and a control unit; the control unit comprises a sensor, an execution component, a controller and an upper computer; the sensor comprises a thermometer, a pressure gauge, a liquid level meter and a flow meter; the sensor is used for temperature, pressure, liquid level or flow signals of each part and uploading the acquired signals to the controller and the upper computer; the upper computer is used for setting temperature and pressure limit values of all parts; the controller is used for comparing the signals acquired by the sensor with the signals set by the upper computer, outputting control signals and correspondingly controlling the operation of the execution part. The invention can stably operate under the environmental conditions of set temperature and pressure, and greatly improves the efficiency and quality of the leachate treatment.)

1. An automated control system based on a diafiltration concentrate spray drying technique comprising: feed unit, combustion unit, tail gas processing unit, its characterized in that, this system still includes: the system comprises a drying tower, a solid-gas separation unit, a heat recovery system, a steam-water separation unit and a control unit; the control unit comprises a sensor, an execution component, a controller and an upper computer; the sensor comprises a thermometer, a pressure gauge, a liquid level meter and a flow meter;

the sensor is used for acquiring temperature, pressure, liquid level or flow signals at the feeding unit, the combustion unit, the drying tower, the solid-gas separation unit, the heat recovery system and the steam-water separation unit and uploading the acquired signals to the controller and the upper computer;

the upper computer is used for setting temperature and pressure limit values of a combustion unit outlet, a drying tower, an atomizer matching oil tank, a solid-gas separation unit and a heat recovery system;

the controller is used for comparing the signals acquired by the sensor with the signals set by the upper computer, outputting control signals and correspondingly controlling the work of the execution part.

2. The automatic control system according to claim 1, characterized in that the heat recovery system comprises a preheating column (V104), a storage tank (V105) and a washing column (V107).

3. The automatic control system of claim 2, wherein the execution component comprises: the device comprises a blower (BM108), a burner (BM128), an atomizer (BM123), a feed pump (BM126), a feed pump (BM124), an induced draft fan (BM110) and a blanking air shutoff valve (BM 101);

the blower (BM108) is arranged at an inlet of the combustor (BM128), and the operation frequency is automatically adjusted according to the set outlet temperature and the natural gas inlet flow of the combustor (BM 128);

the atomizer (BM123) is installed at the inlet of the drying tower (T101);

the feed pump (BM126) is connected with the liquid storage tank (V105), and the start and stop of the feed pump are controlled according to the stock solution tank liquid level meter and the liquid storage tank liquid level meter;

the feeding pump (BM124) is respectively connected with the liquid storage tank (V105) and the drying tower (T101), and the operating frequency of the feeding pump is adjusted according to the liquid storage tank liquid level meter (LI101) and the drying tower thermometer (TI 102);

the induced draft fan (BM110) is arranged between a gas outlet of the water scrubber (V107) and an inlet of the steam-water separation unit;

and the blanking air shutter (BM101) is arranged at the bottom of the solid-gas separation unit and used for discharging.

4. The automatic control system of claim 1, wherein the sensor comprises: thermometers, pressure gauges, level gauges and flow meters;

the thermometers (TI101, TI102, TI103, TI104, TI106, TI107 and TI108) are arranged at the top and the middle part of the drying tower (T101), the outlet of the burner (BM128), the matching oil tank (V111) of the atomizer, the outlet of the solid-gas separation unit, the outlet of the preheating tower (V104) and the outlet of the water washing tower (V107);

the pressure gauges (PI101, PI102, PI103 and PIG101-103) are arranged on a feeding pipe and a discharging pipe of the solid-gas separation unit, a matching oil tank (V111) of the atomizer and the bottom of the drying tower (T101);

the liquid level meter (LI101) is arranged at the stock solution pool and the liquid storage tank;

the flow meter (FI101) is arranged at the inlet pipeline of the igniter (E101) and the outlet of the feeding pump (BM 126).

5. The automatic control system according to claim 1 or 4, characterized in that the solid-gas separation unit employs a bag-type dust collector (V103).

6. The automatic control system according to any one of claims 1 to 4, wherein the control method of the automatic control system specifically includes the steps of:

s1: acquiring temperature, pressure, liquid level and flow signals of all positions of the automatic control system, and uploading all the signals to the controller and the upper computer;

s2: the temperature and pressure limit values of a burner outlet, a drying tower, an atomizer matching oil tank, a solid-gas separation unit and a heat recovery system in an automatic control system are set through an upper computer;

s3: comparing the temperature and pressure process values collected in step S1 with the set values in step S2; after comparison, the controller sends out a corresponding action instruction;

if the outlet temperature process value is larger than the set value, the opening degree of the inlet regulating valve is reduced, and the natural gas inflow is reduced; if the outlet temperature process value is smaller than the set value, the opening of the inlet regulating valve is adjusted to be large, and the natural gas inflow is increased.

7. The automatic control system of claim 6, wherein the step S3 of comparing the collected temperature and pressure process values with set values comprises:

(1) comparison of drying tower units: the temperature process values in the drying towers are larger than a set value, and after the temperature process values are calculated through a PID (proportion integration differentiation) module in the controller, the frequencies of the atomizer and the feeding pump are output and increased, and the input amount of concentrated solution is increased for designation; the temperature process values in the drying tower bodies are smaller than a set value, and after the temperature process values are calculated through a PID (proportion integration differentiation) module, a command for reducing the frequency of an atomizer and a feeding pump is output, and the input quantity of concentrated solution is increased;

(2) comparison of solid-gas separation units: if the pressure of the feeding hole is larger than the set value of the system, a command of closing the bypass electric valve is sent out, and meanwhile, after the operation is carried out through a PID (proportion integration differentiation) module in the controller, the frequency of an induced draft fan is output and increased, and the air draft speed amount is increased for designation; if the pressure of the feeding hole is smaller than a set value, a bypass electric valve opening instruction is sent, and meanwhile, after the operation of the PID module, the frequency of the induced draft fan is output and reduced, and the air draft speed amount is reduced.

Technical Field

The invention belongs to the technical field of garbage treatment, and relates to an automatic control system based on a percolate concentrated solution atomization drying technology.

Background

With the continuous improvement of the environmental protection requirement, the discharge standard of the percolate is becoming stricter, and the nanofiltration reverse osmosis technology is the most reliable technology for meeting the current standard. At present, a common percolate project adopts a biochemical treatment system and a membrane treatment system, so that a large amount of membrane filtration concentrated solution is generated, pollutants in the membrane filtration concentrated solution mainly comprise humic acid organic matters and salts, and the membrane filtration concentrated solution has the characteristics of high concentration and difficult degradation and is difficult to treat.

The safe treatment and disposal of the membrane filtration concentrated solution are the bottleneck of the development of the current percolate treatment technology, and are the key points and difficulties of environmental management. At present, various problems still exist in the treatment technology of domestic concentrated solution, the treatment is mainly carried out by means of recharging, evaporation, incineration, material membrane separation and the like, and the treatment technology is mainly characterized in that: the concentrated solution recharging technology is to re-introduce the concentrated solution into a landfill system through a recharging system and gradually degrade toxic and harmful substances in the concentrated solution through the landfill. The technology has lower cost and wider application, but has larger limitation in use because many projects do not have landfill sites for recharging, even if the landfill sites have extremely high water content and are extremely difficult to recharge due to the extremely high water content of the garbage heap bodies, the conductivity and the salt concentration of the leachate are easy to continuously increase even if the landfill sites are recharged, and the subsequent treatment difficulty is increased; secondly, the concentrated solution evaporation technology is mainly divided into Submerged Combustion Evaporation (SCE) and mechanical vapor recompression evaporation (MVR): the submerged combustion evaporation system can generate 10-20% of residual liquid, the residual liquid is not treated, the unit treatment cost of the concentrated solution is greatly improved as hazardous waste treatment, and the mechanical vapor recompression evaporation technology is influenced by scaling and foam and is difficult to realize continuous and stable operation; the concentrated solution incineration technology is mainly characterized in that concentrated solution is sprayed back to an incinerator, so that the concentrated solution is seriously corroded to incineration system equipment and the incineration power generation amount is influenced; the concentrated solution material membrane separation technology is to filter the concentrated solution by using a material membrane, wherein the filtering aperture is between ultrafiltration and nanofiltration, ammonia nitrogen and total nitrogen in the concentrated solution are difficult to remove, and the concentrated solution generated by the material membrane still needs to be treated.

Therefore, in order to solve the above technical problems, a method for improving the treatment of leachate is needed.

Disclosure of Invention

In view of the above, the present invention provides an automatic control system based on a concentrated percolate atomization drying technology, which monitors the operating process parameters of the system through a sensor, and acts on an execution component through the signal acquisition, operation and output capabilities of a controller, so that the system process can stably operate under the set temperature and pressure environment conditions, and the efficiency and quality of percolate treatment are greatly improved.

In order to achieve the purpose, the invention provides the following technical scheme:

an automated control system based on a diafiltration concentrate spray drying technique comprising: the system comprises a feeding unit, a combustion unit, a tail gas treatment unit (deodorization system), a drying tower, a solid-gas separation unit, a heat recovery system, a steam-water separation unit (condensation system) and a control unit; the control unit comprises a sensor, an execution component, a controller and an upper computer; the sensor comprises a thermometer, a pressure gauge, a liquid level meter and a flow meter;

the sensor is used for acquiring temperature, pressure, liquid level or flow signals at the feeding unit, the combustion unit, the drying tower, the solid-gas separation unit, the heat recovery system and the steam-water separation unit and uploading the acquired signals to the controller and the upper computer;

the upper computer is used for setting temperature and pressure limit values of a combustion unit outlet, a drying tower, an atomizer matching oil tank, a solid-gas separation unit and a heat recovery system;

the controller is used for comparing the signals acquired by the sensor with the signals set by the upper computer, outputting control signals and correspondingly controlling the work of the execution part.

Preferably, the solid-gas separation unit adopts a bag-type dust collector (V103).

Preferably, the heat recovery system comprises a preheating tower (V104), a liquid storage tank (V105) and a water washing tower (V107).

Preferably, the executing means includes: the device comprises a blower (BM108), a burner (BM128), an atomizer (BM123), a feed pump (BM126), a feed pump (BM124), an induced draft fan (BM110) and a blanking air shutoff valve (BM 101);

the blower (BM108) is arranged at the inlet of the burner (BM128), and the operation frequency is automatically adjusted according to the outlet temperature of the burner (BM128) and the natural gas inlet flow;

the atomizer (BM123) is installed at the inlet of the drying tower (T101);

the feed pump (BM126) is connected with the liquid storage tank (V105), and the start and stop of the feed pump are controlled according to the stock solution tank liquid level meter and the liquid storage tank liquid level meter;

the feeding pump (BM124) is respectively connected with the liquid storage tank (V105), the preheating tower and the drying tower (T101), and the operating frequency of the feeding pump is adjusted according to the drying tower thermometer (TI 102);

the induced draft fan (BM110) is arranged between a gas outlet of the water scrubber (V107) and an inlet of the steam-water separation unit;

and the blanking blower (BM101) is arranged at the bottom of a spiral conveyor of the bag-type dust collector (V103) and is used for discharging.

Preferably, the sensor comprises: thermometers, pressure gauges, level gauges and flow meters;

the thermometers (TI101, TI102, TI103, TI104, TI106, TI107 and TI108) are arranged at the top and the middle part of the drying tower (T101), the outlet of the burner (BM128), the matching oil tank (V111) of the atomizer, the outlet of the solid-gas separation unit (bag-type dust collector V103), the outlet of the preheating tower (V104) and the outlet of the water washing tower (V107);

the pressure gauges (PI101, PI102, PI103 and PIG101-103) are arranged on a feeding pipe and a discharging pipe of the solid-gas separation unit (bag-type dust remover V103), an atomizer matching oil tank (V111) and the bottom of the drying tower (T101);

the liquid level meter (LI101) is arranged at the stock solution pool and the liquid storage tank;

the flow meter (FI101) is arranged at the inlet pipeline of the igniter (E101) and the outlet of the feeding pump (BM 126).

Further, the control method of the automatic control system specifically comprises the following steps:

s1: acquiring temperature, pressure, liquid level and flow signals of all positions of the automatic control system, and uploading all the signals to a PLC (programmable logic controller) and an upper computer;

s2: the temperature and pressure limit values of a burner outlet, a drying tower, an atomizer matching oil tank, a solid-gas separation unit and a heat recovery system in an automatic control system are set through an upper computer;

s3: comparing the temperature and pressure process values collected in step S1 with the set values in step S2; after comparison, the PLC controller sends out a corresponding action instruction;

if the outlet temperature process value is larger than the set value, the opening degree of the inlet regulating valve is reduced, and the natural gas inflow is reduced; if the outlet temperature process value is smaller than the set value, the opening of the inlet regulating valve is adjusted to be large, and the natural gas inflow is increased.

Further, in step S3, comparing the collected temperature and pressure process values with set values, specifically including:

(1) comparison of drying tower units: the temperature process values in the drying towers are larger than a set value, and after the temperature process values are calculated through a PID (proportion integration differentiation) module in the controller, the frequencies of the atomizer and the feeding pump are output and increased, and the input amount of concentrated solution is increased for designation; the temperature process values in the drying tower bodies are smaller than a set value, and after the temperature process values are calculated through a PID (proportion integration differentiation) module, a command for reducing the frequency of an atomizer and a feeding pump is output, and the input quantity of concentrated solution is increased;

(2) comparison of solid-gas separation units (i.e., bag-type dust collectors V103): if the pressure of the feeding hole is larger than the set value of the system, a command of closing the bypass electric valve is sent out, and meanwhile, after the operation is carried out through a PID (proportion integration differentiation) module in the controller, the frequency of an induced draft fan is output and increased, and the air draft speed amount is increased for designation; if the pressure of the feeding hole is smaller than a set value, a bypass electric valve opening instruction is sent, and meanwhile, after the operation of the PID module, the frequency of the induced draft fan is output and reduced, and the air draft speed amount is reduced.

The invention has the beneficial effects that: the invention monitors the operation process parameters of the system in the whole process through the sensor, and acts on the field execution component through the signal acquisition, operation and output capacity of the controller, so that the system can stably operate under the environmental conditions of set temperature and pressure, and the efficiency and the quality of the leachate treatment are greatly improved.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.

Drawings

For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic diagram of the overall structure of the automatic control system of the present invention;

FIG. 2 is a flow chart of the automatic control system of the present invention;

FIG. 3 is a flow chart of temperature control of the automatic control system of the present invention;

FIG. 4 is a pressure control flow diagram of the automatic control system of the present invention.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.

Referring to fig. 1 to 4, the present invention preferably discloses an automatic control system based on the diafiltration concentrated solution atomization drying technology, which comprises: the system comprises a feeding unit, a combustion unit, a tail gas treatment unit (deodorization system), a drying tower T101, a solid-gas separation unit, a heat recovery system, a steam-water separation unit (condensing system) and a control unit. The control unit comprises a sensor, an execution component, a controller and an upper computer; the heat recovery system comprises a preheating tower V104, a liquid storage tank V105 and a water washing tower V107; the solid-gas separation unit adopts a bag-type dust collector V103.

The execution unit includes: the blower BM108, the burner BM128, the atomizer BM123, the feed pump BM126, the feed pump BM124, the induced draft fan BM110 and the blanking air lock-out machine BM 101. The blower BM108 is installed at the inlet of the burner BM128, and automatically adjusts the operation frequency according to the burner outlet temperature and the natural gas intake flow rate. The atomizer BM123 is installed at the inlet of the drying tower T101. The feed pump BM126 is connected with the liquid storage tank V105, and the start and stop of the feed pump are controlled according to the stock solution tank liquid level meter and the liquid storage tank liquid level meter. The feeding pump BM124 is respectively connected with the liquid storage tank V105 and the drying tower T101, and the operating frequency of the feeding pump is adjusted according to the liquid storage tank liquid level meter LI101 and the drying tower temperature meter TI 102. And an induced draft fan BM110 is arranged between a gas outlet of the water washing tower V107 and an inlet of the steam-water separation unit. And the blanking air shutter BM101 is arranged at the bottom of the bag-type dust collector V103 screw conveyer and used for discharging.

The sensors include thermometers (TI101, TI102, TI103, TI104, TI106, TI107, TI108), pressure gauges (PI101, PI102, PI103, PIGs 101-103), a level gauge LI101 and a flow meter FI 101. Thermometers (TI101, TI102, TI103, TI104, TI106, TI107 and TI108) are arranged at the top and the middle part of the drying tower T101, the outlet of the burner BM128, the outlet of the atomizer matching oil tank V111, the outlet of the bag-type dust collector V103, the outlet of the preheating tower V104 and the outlet of the water washing tower V107. The pressure gauges PI101, PI102, PI103 and PIG101-103 are arranged on a feed pipe and a discharge pipe of the bag-type dust remover V103, a matching oil tank V111 of the atomizer and the bottom of the drying tower T101. The liquid level meter LI101 is arranged at the stock solution pool and the liquid storage tank. The flow meter FI101 is arranged at the inlet duct of the igniter E101 and at the outlet of the feed pump BM 126.

The control principle of each execution component in the automatic control system is as follows:

(1) control of blower BM 108:

the blower BM108 is controlled by a frequency converter, and can automatically adjust the operating frequency according to the outlet temperature TI104 of the burner and the value of the natural gas inlet flow FI101, adjust the oxygen content of the burner, thereby adjusting the combustion of the burner and finally achieving the purpose of controlling the outlet temperature TI104 of the burner. The blower frequency adjustment is automatic adjustment through PID control.

(2) Control of the burner BM 128:

after the blower continuously operates for not less than 120S (the value can be set), an igniter E101 can be started, a natural gas flow meter FI101 and a natural gas inlet electric regulating valve TV101 are arranged in an igniter air inlet pipeline, an igniter is normally started at the pressure value of 30-50Kpa, and the igniter cannot be started or is emergently stopped at the pressure value of less than 30Kpa and more than 50 Kpa; the flowmeter FI101 is used for counting the gas consumption of the system and participating in frequency adjustment of the blower BM108 through calculation.

(3) Control of the feed pump BM 126:

the feed pump BM126 is interlocked with a stock solution pool liquid level meter and a liquid storage tank liquid level meter LI101, the pump is stopped when the stock solution pool liquid level is lower than 0.5 m (adjustable), the pump is stopped when the liquid storage tank liquid level is higher than 1.0 m (adjustable), and the feed pump is started when the liquid storage tank liquid level is lower than 0.4 m (adjustable) (the stock solution pool liquid level is not lower than a set value); and a flowmeter is arranged at the outlet of the feed pump BM126 and is used for the feed statistics of the concentrated solution.

(4) Control of the feed pump BM 124:

the feeding pump BM124 is controlled by a frequency converter, the feeding pump BM124 is interlocked with a liquid storage tank liquid level meter LI101 and a drying tower thermometer TI102, when the liquid level of a storage tank is lower than 0.4 m (adjustable), the feeding pump is stopped, the drying tower thermometer TI102 participates in the frequency adjustment of the feeding pump through calculation, and when the temperature is lower than a set value, the frequency of the feeding pump is smaller; when the temperature is above the set point, the feed pump frequency is increased. The operating frequency of the feed pump is automatically adjusted by PID adjustment.

(5) Control of the drying tower T101:

starting the oil supply pump BM 122; starting the oil well pump BM 120; the oil supply pump BM122 and the oil well pump BM120 are interlocked with the TI103 and the PI 103; the atomizer BM123 is controlled by a frequency converter, the atomizer is interlocked with a temperature TI103 and a pressure gauge PI103 of a matched oil tank, when the temperature TI103 of the oil tank is higher than 60 ℃ (adjustable) or the pressure is lower than 8kpa (adjustable), the atomizer is stopped, and the automatic adjustment of the frequency of the atomizer is interlocked with the measurement value of a middle temperature TI10) of a drying tower; starting the oil supply pump BM 122; starting the oil well pump BM 120; the oil supply pump BM122 and the oil well pump BM120 are interlocked with the TI103 and the PI 103; the drying tower temperature TI102 is simultaneously interlocked with the feeding pump BM 124; a thermometer TI101 at the top of the drying tower is interlocked with a natural gas inlet electric regulating valve TV101, the opening degree of the TV101 is reduced when the TI101 measuring value is higher than a set value 130 ℃ (adjustable), and the opening degree of the TV101 is increased when the TI101 measuring value is smaller than a set value 110 ℃ (adjustable); three pressure gauges (PIG101-103) are arranged at the bottom of the drying tower, and when the pressure value is larger than a set value, an alarm is given out, which indicates that the materials at the bottom of the drying tower are seriously accumulated.

(6) Control of bag-type dust collector V103:

the lifting cylinder can be started and stopped manually or automatically by one key according to an equipment starting scheme; starting a blanking auger (BM 114); starting a blanking air-lock machine; a pressure gauge PI101 and a bypass electric valve TV102 are arranged on a feed pipe of a bag-type dust collector V103; the discharge pipe is provided with a temperature TI106 and a pressure gauge PI 102; PI101 is interlocked with an outlet induced draft fan BM110, TV102 is interlocked with a bag-type dust collector outlet thermometer TI106, and when the TI106 temperature is higher than a set value of 80 ℃ (adjustable), the TV102 is turned on.

(7) Control of the preheating column V104:

and starting a blanking air-lock machine BM101, and setting a thermometer TI107 on an outlet pipeline.

(8) Control of the induced draft fan BM 110:

and starting an induced draft fan BM110, wherein the induced draft fan adopts frequency conversion control, and the automatic adjustment of the frequency is interlocked with the PI 101. The operation frequency of the induced draft fan is automatically adjusted through PID adjustment.

(9) The control of the condensing system and the deodorizing system adopts one-key starting.

The control method of the automatic control system of the embodiment specifically comprises the following steps:

s1: acquiring temperature, pressure, liquid level and flow signals of all positions of the automatic control system, and uploading all the signals to a PLC (programmable logic controller) and an upper computer;

s2: the temperature and pressure limit values of a burner outlet, a drying tower, an atomizer matching oil tank, a solid-gas separation unit and a heat recovery system in an automatic control system are set through an upper computer;

s3: comparing the temperature and pressure process values collected in step S1 with the set values in step S2; after comparison, the PLC controller sends out a corresponding action instruction;

s4: the burner unit goes through the step S3, the outlet temperature process value is larger than the set value, the opening degree of the inlet adjusting valve is adjusted to be small, and the natural gas inlet amount is reduced; and when the outlet temperature process value is smaller than the set value, the opening of the inlet regulating valve is increased, and the natural gas inflow is increased.

If the outlet temperature process value is larger than the set value, the opening degree of the inlet regulating valve is reduced, and the natural gas inflow is reduced; if the outlet temperature process value is smaller than the set value, the opening of the inlet regulating valve is adjusted to be large, and the natural gas inflow is increased.

Further, in step S3, comparing the collected temperature and pressure process values with set values, specifically including:

after the comparison in the step S3, the temperature process values in the drying towers are greater than the set value, after the operation of the PID module, the frequencies of the atomizer and the feeding pump are output and increased, the designation of the input quantity of the concentrated solution is increased, the temperature process values in the drying towers are less than the set value, after the operation of the PID module, the frequency commands of the atomizer and the feeding pump are output and decreased, and the input quantity of the concentrated solution is increased;

after the comparison in the step S3, if the temperature process value in the atomizer oil tank is greater than the set value, an instruction for starting the oil pump to increase the circulation speed of the oil in the oil tank is issued, and if the temperature process value in the atomizer oil tank is greater than the set value, an instruction for stopping the oil pump to supply the oil is issued;

after the solid-gas separation unit (bag-type dust collector V103) is compared in the step S3, if the pressure of the feeding hole is larger than the set value in the step S2, a command of closing a bypass electric valve is sent out, and meanwhile, after the operation of a PID (proportion integration differentiation) module, the frequency of an induced draft fan is output and increased, and the air draft speed amount is increased to be specified; if the pressure of the feeding hole is smaller than the set value in the step S2, a bypass electric valve opening instruction is sent out, and meanwhile, after the operation of a PID (proportion integration differentiation) module, the frequency of an induced draft fan is output and reduced, and the air draft speed amount is reduced;

the specific control method of step S4: when the process value of the temperature of each link in the system is larger than a set value, reducing the supply amount of natural gas, increasing the supply amount of concentrated solution, outputting an instruction of reducing the opening of an air inlet valve and increasing the output power of a field execution part, increasing the output power of a feed pump and an atomizer, and increasing the input amount of a cold medium; when the process value of the temperature of each link in the system is smaller than a set value, the supply amount of natural gas is increased, the supply amount of concentrated solution is reduced, at the moment, an instruction for increasing the opening of the air inlet valve and reducing the output power of the field execution part is output, the output power of the feeding pump and the atomizer is reduced, and the input amount of cold medium is reduced.

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.