Spraying temperature control method and system

Abstract

The invention provides a spraying temperature control method and system, and the method comprises the steps: obtaining an inlet flue gas temperature and an outlet flue gas temperature after a temperature control instruction is received; smoothing the inlet flue gas temperature and the outlet flue gas temperature to obtain an inlet flue gas temperature correction value and an outlet flue gas temperature correction value; calculating a first deviation between the inlet flue gas temperature correction value and a set temperature, and obtaining an advance of a target water flow based on the first deviation; calculating a second deviation between the outlet flue gas temperature correction value and a set temperature, obtaining a compensation amount of a target water flow based on the second deviation, and summing the initial amount and the compensation amount to obtain the target water flow; the actual water flow of the current process section is obtained, and a first difference value between the actual water flow and the target water flow is calculated; and adjusting the opening degree of the current process section waterway valve based on the first difference value. The change of the required water flow is predicted through the change of the inlet temperature, and the corresponding response speed is increased.

Description

Technical Field

[0001] The present application relates to the field of automatic control technology, and in particular to a spray temperature control method and system. Background Art

[0002] The pollution of coal-fired boilers, in addition to the pollution caused by coal transportation, ash and slag to roads and storage sites, and fly ash pollution, flue gas emissions are the biggest pollution. In the design and manufacture of general industrial coal-fired boilers, in order to avoid corrosion of the tail heating surface and ash blockage, and to further burn out the fly ash, the standard exhaust temperature is generally not less than 180℃, and the highest can reach 250℃. High-temperature flue gas emissions not only cause a large amount of heat energy waste, but also pollute the environment, so generally economizers, dust collectors and other equipment are added to reduce the exhaust temperature to below 200℃ and the smoke and dust emissions to within the emission standards.

[0003] Flue gas contains highly polluting components such as sulfur dioxide and nitrogen oxides, and direct emission will pollute the environment. For example, part of the sulfur dioxide in coke oven flue gas is formed by the combustion of sulfur-containing substances brought in by coke oven leakage, and part of it comes from the combustion of sulfur-containing substances in the return gas. Therefore, the emission of coke oven flue gas needs to be desulfurized before it can meet the emission standards. The temperature of coke oven flue gas is about 200 degrees, which is too high for desulfurization treatment, so flue gas cooling pretreatment before desulfurization is required. At present, traditional flue gas cooling pretreatment generally adopts direct spraying of a large amount of water to achieve the cooling effect, but this method has the following problems: after the spraying is completed, it is impossible to know whether the flue gas has been cooled to the temperature required for desulfurization, resulting in poor flue gas desulfurization treatment effect and uneven flue gas quality discharged into the air; at the same time, it is easy to cause too much water to be added to the desulfurization system, thereby destroying the water balance.

[0004] Therefore, the current control method for flue gas cooling spray has a lag and cannot accurately determine whether the flue gas cooling temperature meets the desulfurization requirements, resulting in increased water consumption and increased energy consumption. Summary of the invention

[0005] The present application provides a spray temperature control method and system to solve the problem that the current control method for flue gas cooling spray has hysteresis and cannot accurately determine whether the flue gas cooling temperature meets the desulfurization requirements, resulting in increased water consumption and increased energy consumption.

[0006] In a first aspect, the present application provides a spray temperature control method, the method comprising:

[0007] After receiving the temperature control instruction, the inlet flue gas temperature and the outlet flue gas temperature are obtained;

[0008] Smoothing the inlet flue gas temperature and the outlet flue gas temperature to obtain an inlet flue gas temperature correction value and an outlet flue gas temperature correction value;

[0009] Calculating a first deviation between the inlet flue gas temperature correction value and the set temperature, and obtaining an advance amount of a target water flow rate based on the first deviation;

[0010] Calculating a second deviation between the outlet flue gas temperature correction value and the set temperature, and obtaining a compensation amount for a target water flow rate based on the second deviation;

[0011] The target water flow rate is obtained by summing the advance amount and the compensation amount;

[0012] Acquire an actual water flow rate of a current process section, and calculate a first difference between the actual water flow rate and the target water flow rate;

[0013] The opening of the water circuit valve of the current process section is adjusted based on the first difference.

[0014] In some possible implementations, the method includes:

[0015] The inlet flue gas temperature and the outlet flue gas temperature are smoothed by using a median filtering method to obtain an inlet flue gas temperature correction value and an outlet flue gas temperature correction value.

[0016] In some possible implementations, it is characterized in that the process sections include a semi-oxygen stage, a full oxygen stage, a feeding stage, a first reaction stage, a second reaction stage, and a third reaction stage; wherein different process sections correspond to different parameters.

[0017] In some possible implementations, adjusting the opening of the waterway valve of the current process section based on the first difference includes:

[0018] Determine the proportional coefficient and integral coefficient of the current process section;

[0019] Obtain the first valve opening of the previous process section of the current process section;

[0020] The opening of the waterway valve of the current process section is calculated based on the proportional coefficient, the integral coefficient and the first valve opening.

[0021] In some possible implementations, calculating the opening of the waterway valve of the current process section based on the proportional coefficient, the integral coefficient, and the first valve opening includes:

[0022] Calculate the opening of the waterway valve in the current process section based on the first formula;

[0023] The first formula is Among them, P and TI are the proportional coefficient and integral coefficient corresponding to different process sections, and ΔQ is the first difference.

[0024] In some possible implementations, calculating the deviation between the inlet flue gas temperature correction value and the set temperature to obtain the advance amount of the target water flow rate includes:

[0025] Calculating a first deviation between the inlet flue gas temperature correction value and the set temperature;

[0026] Substitute the first deviation into the second formula to calculate the advance amount of the target water flow rate; the second formula is Q 水1 =ΔT 入口烟气 *c 烟气 *Q 烟气 / (ΔT 水 *c 水 ).

[0027] In some possible implementations, calculating the second deviation between the outlet flue gas temperature correction value and the set temperature to obtain the compensation amount of the target water flow rate includes:

[0028] Calculating a second deviation between the outlet flue gas temperature correction value and the set temperature;

[0029] Substitute the second deviation into the third formula to calculate the compensation amount of the target water flow; the third formula is Q 水2 =ΔT 出口烟气 *c 烟气 *Q 烟气 / (ΔT 水 *c 水 ).

[0030] In some possible implementations, smoothing the inlet flue gas temperature and the outlet flue gas temperature to obtain an inlet flue gas temperature correction value and an outlet flue gas temperature correction value includes:

[0031] Performing differentiation processing on the first deviation and the second deviation to obtain a first differential value and a second differential value;

[0032] Substitute the first differential value and the second differential value into the fourth formula to calculate the target water flow rate; the fourth formula is Q 水 =(2-(ΔT 出口微分 -0.65))×(ΔT 出口 +ΔT 入口微分 )×4.7×10 -7 ×Q 烟气 .

[0033] In some possible implementations, the method further includes:

[0034] At every preset interval, the inlet smoke temperature and the outlet smoke temperature are obtained, and the inlet smoke temperature and the outlet smoke temperature are combined with the server communication protocol format and the packaged data packet is sent to the server.

[0035] In a second aspect, the present application provides a spray temperature control system, the system comprising:

[0036] A temperature detection device is provided on the inner wall of the pipeline and is used to detect the temperature;

[0037] A spraying device, used for spraying clean water to achieve cooling;

[0038] A flow device, arranged on a water inlet pipe connected to the spray device, wherein the flow meter is used to detect the flow rate of the inlet water;

[0039] A controller, electrically connected to the temperature detection device, the spray device and the flow device;

[0040] The controller is configured to:

[0041] After receiving the temperature control instruction, the inlet flue gas temperature and the outlet flue gas temperature are obtained;

[0042] Smoothing the inlet flue gas temperature and the outlet flue gas temperature to obtain an inlet flue gas temperature correction value and an outlet flue gas temperature correction value;

[0043] Calculating a first deviation between the inlet flue gas temperature correction value and the set temperature, and obtaining an advance amount of a target water flow rate based on the first deviation;

[0044] Calculating a second deviation between the outlet flue gas temperature correction value and the set temperature, and obtaining a compensation amount for a target water flow rate based on the second deviation;

[0045] The target water flow rate is obtained by summing the advance amount and the compensation amount;

[0046] Acquire an actual water flow rate of a current process section, and calculate a first difference between the actual water flow rate and the target water flow rate;

[0047] The opening of the water circuit valve of the current process section is adjusted based on the first difference.

[0048] From the above content, it can be seen that the present application provides a spray temperature control method and system, which includes obtaining the inlet flue gas temperature and the outlet flue gas temperature after receiving the temperature control instruction; smoothing the inlet flue gas temperature and the outlet flue gas temperature to obtain the inlet flue gas temperature correction value and the outlet flue gas temperature correction value; calculating the first deviation between the inlet flue gas temperature correction value and the set temperature, and obtaining the advance amount of the target water flow based on the first deviation; calculating the second deviation between the outlet flue gas temperature correction value and the set temperature, and obtaining the compensation amount of the target water flow based on the second deviation; summing the advance amount and the compensation amount to obtain the target water flow; obtaining the actual water flow of the current process section, calculating the first difference between the actual water flow and the target water flow; adjusting the opening of the water valve of the current process section based on the first difference. The present application calculates the required water volume through a model based on the deviation between the inlet temperature, the outlet temperature and the set temperature, and then uses PID to control the regulating valve according to the water flow. The change in the required water flow is predicted by the change in the inlet temperature, which improves the corresponding speed. The regulating valve can be debugged before hot debugging, shortening the hot test time. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0050] Figure 1 This is a flow chart of the spray temperature control method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0051] The following embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following embodiments do not represent all implementations consistent with the present application. They are only examples of systems and methods consistent with some aspects of the present application as detailed in the claims.

[0052] The pollution of coal-fired boilers, in addition to the pollution caused by coal transportation, ash and slag to roads and storage sites, and fly ash pollution, flue gas emissions are the biggest pollution. In the design and manufacture of general industrial coal-fired boilers, in order to avoid corrosion of the tail heating surface and ash blockage, and to further burn out the fly ash, the standard exhaust temperature is generally not less than 180℃, and the highest can reach 250℃. High-temperature flue gas emissions not only cause a large amount of heat energy waste, but also pollute the environment, so generally economizers, dust collectors and other equipment are added to reduce the exhaust temperature to below 200℃ and the smoke and dust emissions to within the emission standards.

[0053] Flue gas contains highly polluting components such as sulfur dioxide and nitrogen oxides, and direct emission will pollute the environment. For example, part of the sulfur dioxide in coke oven flue gas is formed by the combustion of sulfur-containing substances brought in by coke oven leakage, and part of it comes from the combustion of sulfur-containing substances in the return gas. Therefore, the emission of coke oven flue gas needs to be desulfurized before it can meet the emission standards. The temperature of coke oven flue gas is about 200 degrees, which is too high for desulfurization treatment, so flue gas cooling pretreatment before desulfurization is required. At present, traditional flue gas cooling pretreatment generally adopts direct spraying of a large amount of water to achieve the cooling effect, but this method has the following problems: after the spraying is completed, it is impossible to know whether the flue gas has been cooled to the temperature required for desulfurization, resulting in poor flue gas desulfurization treatment effect and uneven flue gas quality discharged into the air; at the same time, it is easy to cause too much water to be added to the desulfurization system, thereby destroying the water balance.

[0054] Therefore, the current control method for flue gas cooling spray has a lag and cannot accurately determine whether the flue gas cooling temperature meets the desulfurization requirements, resulting in increased water consumption and increased energy consumption.

[0055] Based on this, the present application provides a spray temperature control method and system. First, the temperature parameters are smoothed to eliminate the disturbance of the sampling process. The deviation between the inlet temperature and the set temperature can be calculated to obtain the advance amount of the required water flow, and the deviation between the outlet temperature and the set temperature is the compensation amount of the water flow. The sum of the advance amount and the compensation amount is the required cooling water flow. Finally, the regulating valve tracks the set water flow.

[0056] In some embodiments, Figure 1 As shown, the present application provides a spray temperature control method, the method comprising:

[0057] S1: After receiving the temperature control instruction, the inlet flue gas temperature and the outlet flue gas temperature are obtained.

[0058] In some embodiments, the inlet smoke temperature and the outlet smoke temperature are obtained at preset intervals, and the inlet smoke temperature and the outlet smoke temperature are packaged and sent to the server in accordance with the server communication protocol format to monitor and record the inlet smoke temperature and the outlet smoke temperature.

[0059] S2: Smoothing the inlet flue gas temperature and the outlet flue gas temperature to obtain an inlet flue gas temperature correction value and an outlet flue gas temperature correction value.

[0060] In some embodiments, the inlet flue gas temperature and the outlet flue gas temperature are smoothed using a median filtering method to obtain an inlet flue gas temperature correction value and an outlet flue gas temperature correction value.

[0061] S3: Calculate a first deviation between the inlet flue gas temperature correction value and the set temperature, and obtain an advance amount of the target water flow rate based on the first deviation.

[0062] S4: Calculate a second deviation between the outlet flue gas temperature correction value and the set temperature, and obtain a compensation amount of the target water flow based on the second deviation.

[0063] S5: summing the advance amount and the compensation amount to obtain a target water flow rate.

[0064] The specific heat capacity of water is generally 4.186 kJ / (kg·℃). According to the law of conservation of energy, the heat released by the flue gas should be equal to the heat absorbed by the water. Based on the formula ΔT 烟气 *c 烟气 *Q 烟气 =ΔT 水 *c 水 *Q 水 The advance amount and compensation amount of the required water flow can be derived.

[0065] Calculate the first deviation ΔT between the inlet flue gas temperature correction value and the set temperature 入口烟气 , and calculating the second deviation ΔT between the outlet flue gas temperature correction value and the set temperature 出口烟气 .

[0066] The advance amount of water flow required is:

[0067] Q 水1 =ΔT 入口烟气 *c 烟气 *Q 烟气 / (ΔT 水 *c 水 );

[0068] The required water flow compensation is:

[0069] Q 水2 =ΔT 出口烟气 *c 烟气 *Q 烟气 / (ΔT 水 *c 水 );

[0070] According to the above formula, the required water supply flow rate is:

[0071] Q 水 =Q 水1 +Q 水2 .

[0072] In practice, the temperature control has a certain degree of deviation due to factors such as the atomization effect of water, so it is necessary to perform differential processing on the first deviation and the second deviation to obtain the first differential value ΔT 入口微分 and the second differential value ΔT出口微分 .

[0073] ΔT 出口微分 =P 出口 *TD*ΔT 出口 / dt;

[0074] Where P 出口 is the export deviation coefficient, TD is the differential coefficient, dt is the sampling interval, ΔT 出口 is the deviation between the actual temperature and the set value.

[0075]

[0076] Where P 入口 is the inlet deviation coefficient, TI is the integral coefficient, ΔT 入口 is the deviation between the actual inlet temperature and the reference inlet temperature.

[0077] The first differential value ΔT 入口微分 and the second differential value ΔT 出口微分 Alternative Q 水 =Q 水1 +Q 水2 ΔT in 入口烟气 and ΔT 出口烟气 , we get the following formula: Q 水 =(2-(ΔT 出口微分 -0.65))×(ΔT 出口 +ΔT 入口微分 )×4.7×10 -7 ×Q 烟气 .

[0078] S6: Obtain the actual water flow rate of the current process section, and calculate a first difference between the actual water flow rate and the target water flow rate.

[0079] The process sections in the present application include a semi-oxygen stage, a full oxygen stage, a feeding stage, a first reaction stage, a second reaction stage, and a third reaction stage; wherein different process sections correspond to different parameters; and different process sections correspond to different water consumptions based on different parameters.

[0080] S7: adjusting the opening of the water valve of the current process section based on the first difference.

[0081] Wherein, adjusting the opening of the waterway valve of the current process section based on the first difference includes:

[0082] Determine the proportional coefficient and integral coefficient of the current process section;

[0083] Obtain the first valve opening of the previous process section of the current process section;

[0084] The opening of the waterway valve of the current process section is calculated based on the proportional coefficient, the integral coefficient and the first valve opening.

[0085] To improve the speed and stability of response, the temperature adjustment is divided into six stages according to the converter blowing process, namely, semi-oxygen stage, full oxygen stage, feeding stage, first reaction stage, second reaction stage and third reaction stage. According to the changes in the process, the flue gas temperature changes are responded to in advance. At the same time, the PID parameters of different process stages are set by means of segmented control, and the restrictions are open to engineers for modification.

[0086] First calculate the actual measured value Q 测量 With the calculated value Q 水 The deviation ΔQ is then used to control the opening Y of the water valve. n .

[0087] ΔQ=Q 测量 -Q 水 ;

[0088]

[0089] P and TI are proportional coefficients and integral coefficients. According to the converter blowing conditions, it is divided into 6 stages: semi-oxygen stage, full oxygen stage, feeding stage, first reaction stage, second reaction stage and third reaction stage. The P parameters and TI parameters of each stage are set respectively to meet the response speed of the valve and the stability of the water flow in the current stage.

[0090] The spray temperature control method provided in the above embodiment calculates the required water volume through the model according to the deviation between the inlet temperature, the outlet temperature and the set temperature, and then uses the PID control valve according to the water flow rate. The change in the required water flow rate is predicted by the change in the inlet temperature, thereby increasing the corresponding speed. The PID setting of the regulating valve is simple and can be completed before the hot commissioning, thus shortening the hot test time.

[0091] In some embodiments, the present application provides a spray temperature control system, the system comprising:

[0092] A temperature detection device is provided on the inner wall of the pipeline and is used to detect the temperature;

[0093] A spraying device, used for spraying clean water to achieve cooling;

[0094] A flow device, arranged on a water inlet pipe connected to the spray device, wherein the flow meter is used to detect the flow rate of the inlet water;

[0095] A controller, electrically connected to the temperature detection device, the spray device and the flow device;

[0096] The controller is configured to:

[0097] After receiving the temperature control instruction, the inlet flue gas temperature and the outlet flue gas temperature are obtained;

[0098] Smoothing the inlet flue gas temperature and the outlet flue gas temperature to obtain an inlet flue gas temperature correction value and an outlet flue gas temperature correction value;

[0099] Calculating the deviation between the inlet flue gas temperature correction value and the set temperature to obtain the advance amount of the target water flow rate;

[0100] Calculating the deviation between the outlet flue gas temperature correction value and the set temperature to obtain a compensation amount for the target water flow rate;

[0101] The target water flow rate is obtained by summing the advance amount and the compensation amount;

[0102] Acquire an actual water flow rate of a current process section, and calculate a first difference between the actual water flow rate and the target water flow rate;

[0103] The opening of the water circuit valve of the current process section is adjusted based on the first difference.

[0104] In some embodiments, the spray temperature control system includes, in addition to the spray device in the flue and the water inlet pipe connected to the spray device, a temperature detection device arranged in the flue, a flow meter and an electric regulating valve arranged on the water inlet pipe, a controller whose input end signal is connected to the main temperature detection device and the flow meter, and whose output end signal is connected to the electric regulating valve; the controller receives and processes the signals of the main temperature detection device and the flow meter, and outputs a regulating signal to the electric regulating valve to control the flux of the electric regulating valve. By adopting the above technical solution, the temperature detection device detects the temperature of the incoming flue gas, converts the temperature detection signal into a corresponding temperature detection signal to the controller, and the controller converts the required spray water flow according to the temperature detection signal; at the same time, the flow meter can output the flow detection signal to the controller in real time, compare it with the required spray water flow, and the compared numerical signal is fed back to the electric regulating valve to adjust the opening of the electric regulating valve, thereby adjusting the spray water flow, so as to control the temperature of the flue gas cooling according to the real-time detected temperature, thereby achieving the purpose of desulfurization requirements; at the same time, since the water output is controlled, it is not easy to destroy the water balance of the desulfurization system. The spray temperature control system first predicts the required water volume through the deviation between the temperature and the set value, and then adjusts the water circuit regulating valve according to the water volume, which improves the system's response speed to changes in inlet temperature, and the system output is stable with small fluctuations.

[0105] As can be seen from the above embodiments, the present application provides a spray temperature control method and system, which includes obtaining the inlet flue gas temperature and the outlet flue gas temperature after receiving the temperature control instruction; smoothing the inlet flue gas temperature and the outlet flue gas temperature to obtain the inlet flue gas temperature correction value and the outlet flue gas temperature correction value; calculating the first deviation between the inlet flue gas temperature correction value and the set temperature, and obtaining the advance amount of the target water flow based on the first deviation; calculating the second deviation between the outlet flue gas temperature correction value and the set temperature, and obtaining the compensation amount of the target water flow based on the second deviation; summing the advance amount and the compensation amount to obtain the target water flow; obtaining the actual water flow of the current process section, calculating the first difference between the actual water flow and the target water flow; adjusting the opening of the water valve of the current process section based on the first difference. The present application calculates the required water volume through a model based on the deviation between the inlet temperature, the outlet temperature and the set temperature, and then uses PID to control the regulating valve according to the water flow. The change in the required water flow is predicted by the change in the inlet temperature, thereby increasing the corresponding speed. The regulating valve can be debugged before hot debugging, shortening the hot test time.

[0106] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the general concept of this application and do not constitute a limitation on the protection scope of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without creative work belong to the protection scope of this application.

Claims

1. A spray temperature control method, characterized in that: The method comprises: After receiving the temperature control instruction, the inlet flue gas temperature and the outlet flue gas temperature are obtained; Smoothing the inlet flue gas temperature and the outlet flue gas temperature to obtain an inlet flue gas temperature correction value and an outlet flue gas temperature correction value; Calculating a first deviation between the inlet flue gas temperature correction value and the set temperature, and obtaining an advance amount of a target water flow rate based on the first deviation; Calculating a second deviation between the outlet flue gas temperature correction value and the set temperature, and obtaining a compensation amount for a target water flow rate based on the second deviation; The target water flow rate is obtained by summing the advance amount and the compensation amount; Acquire an actual water flow rate of a current process section, and calculate a first difference between the actual water flow rate and the target water flow rate; The opening of the water circuit valve of the current process section is adjusted based on the first difference.

2. The spray temperature control method according to claim 1, characterized in that: The method comprises: The inlet flue gas temperature and the outlet flue gas temperature are smoothed by using a median filtering method to obtain an inlet flue gas temperature correction value and an outlet flue gas temperature correction value.

3. The spray temperature control method according to claim 1, characterized in that: The process sections include a semi-oxygen stage, a full oxygen stage, a feeding stage, a first reaction stage, a second reaction stage, and a third reaction stage; wherein different process sections correspond to different parameters.

4. The spray temperature control method according to claim 3, characterized in that: Adjusting the opening of the waterway valve of the current process section based on the first difference includes: Determine the proportional coefficient and integral coefficient of the current process section; Obtain the first valve opening of the previous process section of the current process section; The opening of the waterway valve of the current process section is calculated based on the proportional coefficient, the integral coefficient and the first valve opening.

5. The spray temperature control method according to claim 4, characterized in that: Calculating the opening of the waterway valve of the current process section based on the proportional coefficient, the integral coefficient and the first valve opening includes: Calculate the opening of the waterway valve in the current process section based on the first formula; The first formula is Among them, P and TI are the proportional coefficient and integral coefficient corresponding to different process sections, and ΔQ is the first difference.

6. The spray temperature control method according to claim 1, characterized in that: Calculating a first deviation between the inlet flue gas temperature correction value and the set temperature, and obtaining an advance amount of a target water flow rate based on the first deviation includes: Calculate the first deviation ΔT between the inlet flue gas temperature correction value and the set temperature 入口烟气 ; Substitute the first deviation into the second formula to calculate the advance amount of the target water flow rate; the second formula is Q 水1 =ΔT 入口烟气 *c 烟气 *Q 烟气 / (ΔT 水 *c 水 ).

7. The spray temperature control method according to claim 1, characterized in that: Calculating a second deviation between the outlet flue gas temperature correction value and the set temperature, and obtaining a compensation amount of a target water flow rate based on the second deviation includes: Calculate the second deviation ΔT between the outlet flue gas temperature correction value and the set temperature 出口烟气 ; Substitute the second deviation into the third formula to calculate the compensation amount of the target water flow; the third formula is Q 水2 =ΔT 出口烟气 *c 烟气 *Q 烟气 / (ΔT 水 *c 水 ).

8. The spray temperature control method according to claim 6 or 7, characterized in that: The method further comprises: The first deviation and the second deviation are differentiated to obtain a first differential value ΔT 入口微分 and the second differential value ΔT 出口微分 ; Substitute the first differential value and the second differential value into the fourth formula to calculate the target water flow rate; the fourth formula is Q 水 =(2-(ΔT 出口微分 -0.65))×(ΔT 出口 +ΔT 入口微分 )×4.7×10 -7 ×Q 烟气 .

9. The spray temperature control method according to claim 1, characterized in that: The method further comprises: At every preset interval, the inlet smoke temperature and the outlet smoke temperature are obtained, and the inlet smoke temperature and the outlet smoke temperature are combined with the server communication protocol format and the packaged data packet is sent to the server.

10. A spray temperature control system, characterized in that: The system comprises: A temperature detection device is provided on the inner wall of the pipeline and is used to detect the temperature; A spraying device, used for spraying clean water to achieve cooling; A flow device, arranged on a water inlet pipe connected to the spray device, wherein the flow meter is used to detect the flow rate of the inlet water; A controller, electrically connected to the temperature detection device, the spray device and the flow device; The controller is configured to: After receiving the temperature control instruction, the inlet flue gas temperature and the outlet flue gas temperature are obtained; Smoothing the inlet flue gas temperature and the outlet flue gas temperature to obtain an inlet flue gas temperature correction value and an outlet flue gas temperature correction value; Calculating a first deviation between the inlet flue gas temperature correction value and the set temperature, and obtaining an advance amount of a target water flow rate based on the first deviation; Calculating a second deviation between the outlet flue gas temperature correction value and the set temperature, and obtaining a compensation amount for a target water flow rate based on the second deviation; The target water flow rate is obtained by summing the advance amount and the compensation amount; Acquire an actual water flow rate of a current process section, and calculate a first difference between the actual water flow rate and the target water flow rate; The opening of the water circuit valve of the current process section is adjusted based on the first difference.

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