Denitrification ammonia injection advance control method, device, storage medium and equipment

Abstract

The present disclosure relates to a denitration ammonia injection advanced control method and device, a storage medium and equipment, the method comprising: obtaining a NOx set value at a chimney inlet, a NOx measured value at the chimney inlet, a NOx measured value at an SCR inlet, a NOx measured value at an SCR outlet, and an oxygen content measured value at a boiler side; determining a deviation value according to the NOx measured value at the chimney inlet and the NOx measured value at the SCR outlet; determining a first correction coefficient according to the NOx measured value at the SCR inlet and the oxygen content measured value at the boiler side; determining a theoretical ammonia injection amount according to the NOx set value at the chimney inlet, the deviation value, and the NOx measured value at the SCR inlet; determining a second correction coefficient according to the NOx set value at the chimney inlet, the deviation value, and the NOx measured value at the SCR outlet; determining an actual ammonia injection amount according to the first correction coefficient, the theoretical ammonia injection amount, and the second correction coefficient; and controlling an ammonia injection valve opening degree according to the actual ammonia injection amount.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of SCR denitration device ammonia injection system, in particular, to a denitration ammonia injection advanced control method and device, a storage medium and equipment. BACKGROUND

[0002] At present, the flow requirement of NOx (a general term for nitrogen oxides, including NO, NO2, etc.) at the chimney inlet is reduced from the original "less than 100 Nm 3 / h" to "less than 25 Nm 3 / h". The ammonia injection automatic control logic of the SCR (Selective Catalytic Reduction) denitration control system of most existing thermal power generating units generally adopts a typical "feedforward + feedback" mode, the feedforward is the f(x) function corresponding to the NOx at the SCR inlet, and the feedback is the NOx data at the SCR outlet or the chimney inlet after PID calculation, which acts on the opening degree of the ammonia injection valve. SUMMARY

[0003] The purpose of the present disclosure is to provide a denitration ammonia injection advanced control method, device, storage medium and equipment to solve the above technical problems.

[0004] In order to achieve the above purpose, the present disclosure provides a denitration ammonia injection advanced control method, comprising:

[0005] obtaining the NOx set value at the chimney inlet, the NOx measured value at the chimney inlet, the NOx measured value at the SCR inlet, the NOx measured value at the SCR outlet, and the oxygen content measured value at the boiler side;

[0006] determining a deviation value according to the NOx measured value at the chimney inlet and the NOx measured value at the SCR outlet;

[0007] determining a first correction coefficient according to the NOx measured value at the SCR inlet and the oxygen content measured value at the boiler side, wherein the first correction coefficient represents a correction coefficient of the leading error between the oxygen content measured value at the boiler side and the NOx measured value at the SCR inlet;

[0008] determining a theoretical ammonia injection amount according to the NOx set value at the chimney inlet, the deviation value and the NOx measured value at the SCR inlet;

[0009] determining a second correction coefficient according to the NOx set value at the chimney inlet, the deviation value and the NOx measured value at the SCR outlet, wherein the second correction coefficient represents a correction coefficient of the theoretical ammonia injection amount;

[0010] determining an actual ammonia injection amount according to the first correction coefficient, the theoretical ammonia injection amount and the second correction coefficient;

[0011] According to the actual ammonia injection amount, the opening of the ammonia injection valve for the denitrification ammonia injection is controlled in advance.

[0012] Optionally, determining the deviation value according to the actual measured NOx value at the chimney inlet and the actual measured NOx value at the SCR outlet includes:

[0013] Calculating an average value of the NOx measured at the SCR outlet within a preset time range and an average value of the NOx measured at the chimney inlet within the preset time range to obtain a first average value and a second average value, respectively;

[0014] The difference between the first mean and the second mean is calculated to obtain the deviation value.

[0015] Optionally, determining the first correction coefficient according to the actual NOx value at the SCR inlet and the actual oxygen content value at the boiler side includes:

[0016] Calculating a first change rate and a second change rate, wherein the first change rate represents a change rate per minute of the oxygen content measured at the boiler side, and the second change rate represents a change rate per minute of the NOx measured at the SCR inlet;

[0017] According to a pre-established first function, the first change rate is input to obtain an oxygen correction coefficient, wherein the first function is a functional relationship established based on historical data;

[0018] According to a pre-established second function, the second change rate is input to obtain a NOx correction coefficient, wherein the second function is a functional relationship established based on the historical data;

[0019] The product of the oxygen correction coefficient and the NOx correction coefficient is calculated to obtain the first correction coefficient.

[0020] Optionally, determining the theoretical ammonia injection amount according to the NOx set value at the chimney inlet, the deviation value, and the NOx measured value at the SCR inlet includes:

[0021] Obtaining a total coal amount and a total air amount, wherein the total coal amount represents an actual total coal amount consumed by the boiler, and the total air amount represents an actual total air amount consumed by the boiler;

[0022] Calculating the sum of the total coal volume and the total air volume to obtain the boiler flue gas volume;

[0023] determining a fixed coefficient according to the boiler flue gas volume;

[0024] Calculating the sum of the NOx set value at the chimney inlet and the deviation value to obtain the NOx set value at the SCR outlet;

[0025] The theoretical ammonia injection amount is calculated based on the boiler flue gas volume, the fixed coefficient, the NOx set value at the SCR outlet, and the NOx measured value at the SCR inlet.

[0026] Optionally, determining the fixed coefficient according to the boiler flue gas volume includes:

[0027] Determining input values ​​of a pre-established third function based on the actual NOx value at the SCR inlet, the actual NOx value at the SCR outlet, and the boiler flue gas volume, wherein the third function is a functional relationship established based on historical data;

[0028] The fixed coefficient is obtained by inputting the input value of the third function through the third function.

[0029] Optionally, determining the input value of a pre-constructed third function according to the NOx measured value at the SCR inlet, the NOx measured value at the SCR outlet, and the boiler flue gas volume includes:

[0030] calculating an average value of the NOx values ​​measured at the SCR inlet as a third average value, and calculating an average value of the NOx values ​​measured at the SCR outlet as a fourth average value;

[0031] Calculating a difference between the third mean and the fourth mean as a first difference;

[0032] The product of the first difference and the boiler flue gas volume is calculated to obtain an input value of the third function.

[0033] Optionally, the calculating the theoretical ammonia injection amount according to the boiler flue gas volume, the fixed coefficient, the NOx set value at the SCR outlet, and the NOx measured value at the SCR inlet includes:

[0034] Calculating a difference between a measured NOx value at the SCR inlet and a set NOx value at the SCR outlet as a second difference;

[0035] The product of the second difference, the fixed coefficient, and the boiler flue gas volume is calculated to obtain the theoretical ammonia injection volume.

[0036] Optionally, determining the second correction coefficient according to the NOx set value at the chimney inlet, the deviation value, and the NOx measured value at the SCR outlet includes:

[0037] Get the NOx set value at the SCR outlet;

[0038] Obtaining a PID output value through PID calculation according to the NOx set value at the SCR outlet and the NOx measured value at the SCR outlet;

[0039] The second correction coefficient is obtained by inputting the PID output value through a pre-constructed fourth function, wherein the fourth function is a functional relationship established based on historical data.

[0040] Optionally, determining the actual ammonia injection amount according to the first correction coefficient, the theoretical ammonia injection amount, and the second correction coefficient includes:

[0041] The actual ammonia injection amount is obtained by calculating the product of the first correction coefficient, the theoretical ammonia injection amount, and the second correction coefficient.

[0042] In a second aspect, the present disclosure provides a denitrification ammonia injection advance control device, comprising:

[0043] The data acquisition module is used to obtain the NOx set value at the chimney inlet, the NOx measured value at the chimney inlet, the NOx measured value at the SCR inlet, the NOx measured value at the SCR outlet, and the oxygen content measured value at the boiler side;

[0044] a deviation module, configured to determine a deviation value based on the NOx measured value at the chimney inlet and the NOx measured value at the SCR outlet;

[0045] an advance module, configured to determine a first correction coefficient based on the actual NOx value at the SCR inlet and the actual oxygen content value at the boiler side, wherein the first correction coefficient represents a correction coefficient for a lead error between the actual oxygen content value at the boiler side and the actual NOx value at the SCR inlet;

[0046] a theoretical ammonia injection amount calculation module, configured to determine a theoretical ammonia injection amount based on the NOx set value at the chimney inlet, the deviation value, and the NOx measured value at the SCR inlet; and to determine a second correction coefficient based on the NOx set value at the chimney inlet, the deviation value, and the NOx measured value at the SCR outlet, wherein the second correction coefficient represents a correction coefficient for the theoretical ammonia injection amount;

[0047] an actual ammonia injection amount calculation module, configured to determine an actual ammonia injection amount based on the first correction coefficient, the theoretical ammonia injection amount, and the second correction coefficient;

[0048] The control module is used to control the opening of the ammonia injection regulating valve of the denitration ammonia injection according to the actual ammonia injection amount.

[0049] In a third aspect, the present disclosure provides a non-transitory computer-readable storage medium having a computer program stored thereon, which implements the steps of the method described in the first aspect when executed by a processor.

[0050] In a fourth aspect, the present disclosure provides an electronic device, comprising:

[0051] a memory having a computer program stored thereon;

[0052] A processor is used to execute the computer program in the memory to implement the steps of the method of the first aspect.

[0053] In the above technical solution, the deviation between the actual NOx value at the chimney inlet and the actual NOx value at the SCR outlet is first determined, and then the first correction coefficient is determined through the actual NOx value at the SCR inlet and the actual oxygen content measured on the boiler side. The deviation value and the first correction coefficient are introduced into the calculation of the ammonia injection amount. This can eliminate the error caused by calculating the ammonia injection amount based on the actual value at the SCR outlet, and can increase or decrease the denitrification ammonia injection amount before the boiler operating condition is disturbed, correct the calculation of the ammonia injection amount, and make the ammonia injection valve act in advance to ensure that NOx is within the range of environmental protection requirements.

[0054] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0056] Figure 1 A flow chart of a method for advanced control of denitration ammonia injection provided by an exemplary embodiment is shown;

[0057] Figure 2 A flowchart showing a specific implementation of S130 in an exemplary embodiment is shown;

[0058] Figure 3 A flowchart showing a specific implementation of S140 in an exemplary embodiment is shown;

[0059] Figure 4 A flowchart showing a specific implementation of S143 in an exemplary embodiment is shown;

[0060] Figure 5 A flowchart showing a specific implementation of S150 in an exemplary embodiment is shown;

[0061] Figure 6 A schematic diagram of a denitrification ammonia injection advance control device provided by an exemplary embodiment is shown;

[0062] Figure 7 A block diagram of an electronic device provided by an exemplary embodiment is shown. DETAILED DESCRIPTION

[0063] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0064] It should be noted that all actions of acquiring signals, information or data in the present disclosure are carried out in compliance with the corresponding data protection laws and policies of the country where they are located and with the authorization given by the owner of the corresponding device.

[0065] As described in the background technology, in the related art, since the NOx hysteresis at the chimney inlet is very long, usually about 2 minutes, and the NOx hysteresis at the SCR outlet is relatively short, usually about 70s, this will cause the NOx values ​​at the chimney inlet and the SCR outlet to deviate, leading to a series of problems such as adjustment lag, excessive ammonia injection, preheater blockage, and unit failure to operate normally. Therefore, it is particularly important to control the deviation of NOx between the SCR outlet and the chimney inlet.

[0066] As for the acquisition of SCR outlet data, in the relevant technology, since the data collected on the boiler side changes about 70 seconds ahead of the data on the SCR side, when the denitrification data on the SCR side at a certain moment is collected, the data lags behind the actual denitrification data at the collection moment by about 70 seconds. Therefore, it is equally important to control the leading changes in the data on the boiler side relative to the SCR side in advance, as well as the impact on obtaining the data on the SCR side.

[0067] Therefore, the present disclosure provides a method for advanced control of denitrification ammonia injection, which pre-calculates the deviation of NOx at the SCR outlet and the chimney inlet, as well as the coefficient used to correct the lead of boiler-side data compared to the SCR-side data. On the one hand, the deviation value can be used as feedback along with the chimney inlet NOx to control the SCR outlet NOx. The SCR outlet NOx can be calculated solely based on the chimney inlet NOx. This ensures both rapid and precise control and ensures that the actual chimney inlet NOx value remains near its set value, eliminating the need for constant manual supervision and management, significantly reducing manual workload. On the other hand, the denitrification ammonia injection amount can be increased or decreased before the boiler operating conditions are disturbed, enabling the denitrification valve to operate in advance, ensuring that the chimney-side NOx at the environmental protection measurement point does not exceed the limit.

[0068] In order to enable those skilled in the art to better understand the present disclosure, the present invention is further explained in detail below with reference to a 1000MW boiler denitrification control system as an example.

[0069] The flue gas flow of the denitrification system is divided into two sides, A and B, corresponding to the denitrification SCR1 side and SCR2 side respectively. Each side is equipped with a set of denitrification automatic ammonia injection device, and a total of two dilution fans are configured for both sides of denitrification, one of which is in operation and the other is on standby.

[0070] Figure 1 A flow chart of a method for advanced control of denitrification ammonia injection provided by an exemplary embodiment is shown.

[0071] like Figure 1 As shown, the method includes:

[0072] S110 , obtaining the NOx set value at the chimney inlet, the NOx measured value at the chimney inlet, the NOx measured value at the SCR inlet, the NOx measured value at the SCR outlet, and the oxygen content measured value at the boiler side.

[0073] Among them, the NOx set value at the chimney inlet is manually input, and the NOx measured value at the chimney inlet, the NOx measured value at the SCR inlet, the NOx measured value at the SCR outlet, and the oxygen content measured value on the boiler side are all obtained through the DCS (Distributed Control System).

[0074] For example, the flue gas flow of the denitrification system is divided into two sides, A and B, corresponding to the denitrification SCR1 and SCR2 sides, respectively. For SCR1, the measured NOx values ​​at the SCR1 inlet and the SCR1 outlet are obtained; for SCR2, the measured NOx values ​​at the SCR2 inlet and the SCR2 outlet are obtained.

[0075] In a possible implementation manner, all measurement points of the NOx measured values ​​are converted to values ​​with a 6% oxygen content to ensure calculation and control accuracy.

[0076] S120: Determine a deviation value based on the actual NOx value at the chimney inlet and the actual NOx value at the SCR outlet.

[0077] Due to flue gas flow and equipment layout, there is a deviation between the NOx data at the chimney inlet and the SCR outlet. Therefore, the deviation between the actual measured NOx values ​​at the chimney inlet and the SCR outlet is calculated in advance. This allows the NOx setpoint at the SCR outlet to be accurately calculated by simply setting the NOx setpoint at the chimney inlet. Specifically, the NOx setpoint at the SCR outlet can be calculated, for example, as shown in step S144 below.

[0078] In a specific implementation, the above-mentioned step S120 includes: calculating the average value of the NOx measured value at the SCR outlet within a preset time range and the average value of the NOx measured value at the chimney inlet within a preset time range, respectively obtaining a first mean value and a second mean value; calculating the difference between the first mean value and the second mean value to obtain a deviation value.

[0079] It is worth noting that the preset time can be, for example, 0.5 hours, and this value can be changed according to actual needs. The first mean value represents the average value of the NOx value measured at the SCR outlet within 0.5 hours. It is worth noting that the average value of the NOx value measured at the SCR outlet within 0.5 hours is the average value of the NOx value measured at the SCR1 outlet within 0.5 hours and the average value of the NOx value measured at the SCR2 outlet within 0.5 hours; the second mean value represents the average value of the NOx value measured at the chimney inlet within 0.5 hours.

[0080] Specifically, the calculation formula of the deviation value D is as follows:

[0081]

[0082] Where D represents the deviation value, μ1 represents the average value of the NOx measured at the outlet of SCR1 within the preset time, μ2 represents the average value of the NOx measured at the outlet of SCR2 within the preset time, and μ3 represents the second average value. Represents the first mean.

[0083] S130 , determining a first correction coefficient based on the actual NOx value at the SCR inlet and the actual oxygen value at the boiler side, wherein the first correction coefficient represents a correction coefficient for a lead error between the actual oxygen value at the boiler side and the actual NOx value at the SCR inlet.

[0084] Due to flue gas flow, equipment layout, and the sampling, calculation, and transmission capabilities of the denitrification CEMS system, changes in oxygen levels at the boiler occur approximately 70 seconds before changes in NOx at the SCR inlet. By the time the actual NOx value at the SCR inlet begins to change, the data generated by the boiler 70 seconds earlier has already been generated. Therefore, a correction factor (the first correction factor) is calculated based on the actual NOx value at the SCR inlet and the actual oxygen value at the boiler. This ensures that when the SCR inlet acquires NOx data, it also synchronizes the data with the moment the oxygen level at the boiler begins to change.

[0085] For example, for SCR1, the first correction coefficient on the SCR1 side is determined based on the actual NOx value at the SCR1 inlet and the actual oxygen content on the boiler side; for SCR2, the first correction coefficient on the SCR2 side is determined based on the actual NOx value at the SCR2 inlet and the actual oxygen content on the boiler side.

[0086] The specific calculation method of the first correction coefficient can be, for example, Figure 2 as shown in the method steps.

[0087] S140, determining the theoretical ammonia injection amount according to the NOx set value at the chimney inlet, the deviation value, and the NOx measured value at the SCR inlet.

[0088] According to the deviation value calculated in step S120, the NOx set value at the chimney inlet obtained by the DCS, and the NOx measured value at the SCR inlet, the theoretical ammonia injection amount for denitration ammonia injection is calculated.

[0089] For example, for SCR1, the theoretical ammonia injection amount for denitration ammonia injection on the SCR1 side is determined according to the NOx set value at the SCR1 inlet, the set value, and the deviation value calculated in step S120; for SCR2, the theoretical ammonia injection amount for denitration ammonia injection on the SCR2 side is determined according to the NOx set value at the SCR2 inlet, the deviation value calculated in step S120, and the NOx measured value at the SCR2 inlet.

[0090] The specific calculation method of the theoretical ammonia injection amount is shown in the method steps. Figure 3

[0091] S150, determining the second correction coefficient according to the NOx set value at the chimney inlet, the deviation value, and the NOx measured value at the SCR outlet, wherein the second correction coefficient represents a correction coefficient of the theoretical ammonia injection amount.

[0092] According to the deviation value calculated in step S120, the NOx set value at the chimney inlet obtained by the DCS, and the NOx measured value at the SCR outlet, the second correction coefficient is calculated. Since the deviation value is added in the calculation, the calculated second correction coefficient is more accurate.

[0093] For example, for SCR1, the second correction coefficient on the SCR1 side is determined according to the NOx measured value at the SCR1 outlet and the set value; for SCR2, the second correction coefficient on the SCR2 side is determined according to the NOx measured value at the SCR2 outlet and the set value.

[0094] The specific calculation method of the second correction coefficient can be, for example, Figure 5 as shown in the method steps.

[0095] S160, determining the actual ammonia injection amount according to the first correction coefficient, the theoretical ammonia injection amount, and the second correction coefficient.

[0096] ​According to the first correction coefficient calculated in step S130, the theoretical ammonia injection amount calculated in step S140 and the second correction coefficient calculated in step S150, the actual ammonia injection amount of denitrification ammonia injection is calculated. Since the first correction coefficient and the second correction coefficient are added to the calculation, and the deviation value is added to the calculation of the theoretical ammonia injection amount, the calculated actual ammonia injection amount is more accurate.

[0097] For example, for SCR1, the actual ammonia injection amount on the SCR1 side for denitrification ammonia injection is determined based on the first correction coefficient on the SCR1 side, the theoretical ammonia injection amount on the SCR1 side, and the second correction coefficient on the SCR1 side; for SCR2, the actual ammonia injection amount on the SCR2 side for denitrification ammonia injection is determined based on the first correction coefficient on the SCR2 side, the theoretical ammonia injection amount on the SCR2 side, and the second correction coefficient on the SCR2 side.

[0098] In a specific implementation, the above step S160 includes: calculating the product of the first correction coefficient, the theoretical ammonia injection amount, and the second correction coefficient to obtain the actual ammonia injection amount.

[0099] Specifically, the calculation formula for the actual ammonia injection amount Q is as follows:

[0100] Q=Q′×K i ×k s

[0101] In the formula, Q represents the actual ammonia injection amount, Q' represents the theoretical ammonia injection amount, K i represents the second correction coefficient, k s Indicates the first correction coefficient.

[0102] For example, for SCR1, the theoretical ammonia injection amount Q′1 on the SCR1 side and the first correction coefficient k are calculated. s1 And the second correction coefficient K i1 According to the calculation formula of the actual ammonia injection amount, the actual ammonia injection amount Q1 on the SCR1 side can be calculated; for SCR2, the theoretical ammonia injection amount Q′2 on the SCR2 side and the first correction coefficient K s2 And the second correction coefficient K i2 According to the calculation formula of the actual ammonia injection amount, the actual ammonia injection amount Q2 on the SCR2 side can be calculated.

[0103] S170, controlling the opening of the ammonia injection regulating valve for denitrification ammonia injection according to the actual ammonia injection amount.

[0104] Specifically, the measured ammonia injection rate is first obtained. Based on the deviation between the calculated actual ammonia injection rate and the measured ammonia injection rate, a PID (proportional-integral controller) is automatically adjusted to output the ammonia injection valve opening, with an output value ranging from 0 to 100. It is worth noting that the proportional coefficient and integration time of the PID controller are adjusted based on field tests.

[0105] For example, for SCR1, according to the deviation between the actual ammonia injection amount on the SCR1 side and the actually measured ammonia injection amount on the SCR1 side, PID is automatically adjusted to output the ammonia injection valve opening on the SCR1 side, with an output value of 0 to 100. According to the valve opening, the ammonia injection amount on the SCR1 side is controlled; for SCR2, according to the deviation between the actual ammonia injection amount on the SCR2 side and the actually measured ammonia injection amount on the SCR2 side, PID is automatically adjusted to output the ammonia injection valve opening on the SCR2 side, with an output value of 0 to 100. According to the valve opening, the ammonia injection amount on the SCR2 side is controlled.

[0106] In the above technical solution, the deviation between the actual NOx value at the chimney inlet and the actual NOx value at the SCR outlet is first determined, and then the first correction coefficient is determined through the actual NOx value at the SCR inlet and the actual oxygen content measured on the boiler side. The deviation value and the first correction coefficient are introduced into the calculation of the ammonia injection amount. This can eliminate the error caused by calculating the ammonia injection amount based on the actual value at the SCR outlet, and can increase or decrease the denitrification ammonia injection amount before the boiler operating condition is disturbed, correct the calculation of the ammonia injection amount, and make the ammonia injection valve act in advance to ensure that NOx is within the range of environmental protection requirements.

[0107] Figure 2 FIG. 4 shows a flow chart of a specific implementation of S130 in an exemplary embodiment. Figure 2 As shown, the method includes:

[0108] S131, calculate a first change rate and a second change rate, wherein the first change rate represents the change rate per minute of the oxygen content measured value on the boiler side, and the second change rate represents the change rate per minute of the NOx measured value at the SCR inlet.

[0109] According to the actual oxygen content measured on the boiler side obtained in step S110, the "analog change rate algorithm" (RATECHANGE) module in the Guodian Zhishen EDPF-NT control system is used to take the change rate per minute of the value and output the first change rate dQ. The upper and lower limits of the output of the change rate algorithm can be adjusted according to field tests.

[0110] According to the actual measured NOx value at the SCR inlet obtained in step S110, the "analog change rate algorithm" module in the Guodian Zhishen EDPF-NT control system is used to take the change rate per minute of the value and output the second change rate. The upper and lower limits of the output of the change rate algorithm can also be adjusted according to field tests.

[0111] For example, for SCR1, according to the actual NOx measured value at the inlet of the SCR1 side obtained in step S110, the "analog change rate algorithm" module in the Guodian Zhishen EDPF-NT control system is used to take the change rate per minute for the value, and output the second change rate dq1 on the SCR1 side; for SCR2, according to the actual NOx measured value at the inlet of the SCR2 side obtained in step S110, the "analog change rate algorithm" module in the Guodian Zhishen EDPF-NT control system is used to take the change rate per minute for the value, and output the second change rate dq2 on the SCR2 side.

[0112] S132 , according to a pre-constructed first function, a first change rate is input to obtain an oxygen correction coefficient, wherein the first function is a functional relationship established based on historical data.

[0113] Based on the historical data of multiple denitrification and ammonia injection, a first function is constructed, wherein the first function refers to the functional relationship between the first change rate dQ and the oxygen correction coefficient Kv0. The comparison table of the first functional relationship is shown in Table 1 below:

[0114] Table 1 Functional relationship between the first change rate and the oxygen correction coefficient

[0115] The first rate of change dQ -0.4 0 0.4 Oxygen correction factor Kv0 0.9 1 1.1

[0116] It is worth noting that, considering the normal fluctuation of the oxygen measurement point, a dead zone of 0.2 is set for the first change rate of the function, that is, when the input first change rate is in the range of [-0.2, 0.2], the output oxygen correction coefficient is 1.

[0117] According to the first change rate dQ calculated in step S131, this value is substituted into the first function, and the corresponding oxygen amount correction coefficient Kv0 is output.

[0118] S133, according to a pre-constructed second function, a second change rate is input to obtain a NOx correction coefficient, wherein the second function is a functional relationship established based on historical data.

[0119] Based on the historical data of multiple denitrification ammonia injections, a second function is constructed, wherein the second function refers to the functional relationship between the second change rate and the NOx correction coefficient. The comparison table of the second functional relationship is shown in Table 2 below:

[0120] Table 2 Functional relationship between the second change rate and the NOx correction coefficient

[0121] Second change rate dq1(dq2) -30 0 30 NOx correction coefficient Kv1 (Kv2) 0.9 1 1.1

[0122] It is worth noting that, considering the normal fluctuation of the SCR inlet measurement point, a dead band of 10 is set for the second change rate of the function, that is, when the input second change rate is in the range of [-10,10], the output NOx correction coefficient is 1.

[0123] The second rate of change dq calculated in step S131 is substituted into the second function to output the corresponding NOx correction factor. For example, for SCR1, the second rate of change dq1 on the SCR1 side calculated in step S131 is substituted into the second function to output the corresponding NOx correction factor Kv1 on the SCR1 side. For SCR2, the second rate of change dq2 on the SCR2 side calculated in step S131 is substituted into the second function to output the corresponding NOx correction factor Kv2 on the SCR2 side.

[0124] S134: Calculate the product of the oxygen correction coefficient and the NOx correction coefficient to obtain a first correction coefficient.

[0125] For example, for SCR1, the first correction coefficient k on the SCR1 side is s1 The calculation formula is as follows:

[0126] k s1 =Kv0×Kv1

[0127] Where k s1 represents the first correction coefficient on the SCR1 side, Kv0 represents the oxygen amount correction coefficient, and Kv1 represents the NOx correction coefficient on the SCR1 side.

[0128] The first correction coefficient k on the SCR1 side s1 The “Lead / Lag Link Algorithm” (LEADLAG) module in the GDZ EDPF-NT control system is used for tuning, and the fault filter is used as the output value of the SCR1 side of the lead module.

[0129] For example, for SCR2, the first correction coefficient k on the SCR2 side is s2 The calculation formula is as follows:

[0130] k s2 =Kv0×Kv2

[0131] Where k s2 represents the first correction coefficient on the SCR2 side, Kv0 represents the oxygen amount correction coefficient, and Kv2 represents the NOx correction coefficient on the SCR2 side.

[0132] The first correction coefficient k on the SCR2 side s2 The “lead / lag link algorithm” module in the Guodian Zhishen EDPF-NT control system is used to adjust it, and the fault filter is used as the output value of the SCR2 side of the lead module.

[0133] In the above technical solution, the first and second rates of change are first determined. Then, based on pre-established first and second functions, the first and second rates of change are inputted to obtain the oxygen correction factor and NOx correction factor, respectively. Finally, the obtained oxygen correction factor and NOx correction factor are multiplied together to obtain the first correction factor. This pre-calculates the correction factor for the lead error between the actual oxygen value measured on the boiler side and the actual NOx value measured at the SCR inlet. This allows the denitrification ammonia injection rate to be increased or decreased before the boiler operating conditions are disturbed, enabling the denitrification valve to operate in advance and ensuring that NOx levels on the chimney side of the environmental protection measurement point do not exceed the limit.

[0134] Figure 3 FIG. 4 shows a flow chart of a specific implementation of S140 in an exemplary embodiment. Figure 3 As shown, the method includes:

[0135] S141, obtaining the total coal amount and the total air volume, wherein the total coal amount represents the actual total coal amount consumed by the boiler, and the total air volume represents the actual total air volume consumed by the boiler.

[0136] When obtaining the total coal and total air volume consumed by the current boiler, since these two values ​​actually fluctuate greatly, they must undergo a certain degree of fault filtering to obtain stable values. Therefore, after the "lead / lag link algorithm" module is adjusted, the output value is used as the total coal volume or total air volume.

[0137] S142, calculating the sum of the total coal volume and the total air volume to obtain the boiler flue gas volume.

[0138] S143: Determine a fixed coefficient based on the flue gas volume of the boiler.

[0139] The fixed system F is adjusted on site by the current boiler. Through long-term tracking statistics, the proportional relationship between the boiler flue gas volume and the fixed coefficient is given. Its purpose is to optimize the theoretical ammonia injection volume to make it closer to the actual ammonia injection volume of the current boiler.

[0140] The specific calculation method of the fixed coefficient F is shown in Figure 4 The method steps shown.

[0141] S144 , calculating the sum of the NOx set value at the chimney inlet and the deviation value to obtain the NOx set value at the SCR outlet.

[0142] The NOx set value at the SCR outlet can be obtained by calculating the sum of the deviation value calculated in step S120 and the NOx set value at the chimney inlet obtained by the DCS.

[0143] S145 , calculating the theoretical ammonia injection amount according to the boiler flue gas volume, the fixed coefficient, the NOx set value at the SCR outlet, and the NOx measured value at the SCR inlet.

[0144] The theoretical ammonia injection amount for denitrification is calculated based on the boiler flue gas volume calculated in step S142, the fixed coefficient calculated in step S143, the NOx set value at the SCR outlet calculated in step S144, and the NOx measured value at the SCR inlet obtained in step S110.

[0145] In a specific implementation, the above step S145 includes: calculating the difference between the actual NOx value at the SCR inlet and the NOx set value at the SCR outlet as the second difference; calculating the product of the second difference, the fixed coefficient and the boiler flue gas volume to obtain the theoretical ammonia injection amount.

[0146] Specifically, the calculation formula of the theoretical ammonia injection amount Q' is as follows:

[0147]

[0148] Where Q′ represents the theoretical ammonia injection amount, S represents the second difference, V represents the boiler flue gas volume, and F represents the fixed coefficient.

[0149] The second difference S=the measured NOx value at the SCR inlet−the set NOx value at the SCR outlet.

[0150] For SCR1, the second difference S1 on the SCR1 side = the NOx measured value at the SCR1 inlet - the NOx set value at the SCR1 outlet; for SCR2, the second difference S2 on the SCR2 side = the NOx measured value at the SCR2 inlet - the NOx set value at the SCR2 outlet.

[0151] In the above technical solution, the total coal volume and total air volume are first determined. The boiler flue gas volume is then determined based on the total coal volume and total air volume, and the fixed coefficient is then determined. The NOx setpoint at the SCR outlet is then determined based on the NOx setpoint at the chimney inlet and the deviation value. Finally, the theoretical ammonia injection rate is determined based on the calculated boiler flue gas volume, the fixed coefficient, the NOx setpoint at the SCR outlet, and the measured NOx value at the SCR inlet. This allows for accurate determination of the theoretical ammonia injection rate for denitrification.

[0152] Figure 4 FIG. 4 shows a flow chart of a specific implementation of S143 in an exemplary embodiment. Figure 4 As shown, the method includes:

[0153] S1431, determining the input value of a pre-constructed third function based on the actual NOx value at the SCR inlet, the actual NOx value at the SCR outlet, and the boiler flue gas volume, wherein the third function is a functional relationship established based on historical data.

[0154] In a specific implementation, the above step S1431 includes:

[0155] The average value of the NOx measured at the SCR inlet is calculated as the third average value, and the average value of the NOx measured at the SCR outlet is calculated as the fourth average value; the difference between the third average value and the fourth average value is calculated as the first difference value; the product of the first difference value and the boiler flue gas volume is calculated to obtain the input value of the third function.

[0156] Specifically, the third mean is the average of the NOx measured values ​​at the SCR1 inlet and the NOx measured values ​​at the SCR2 inlet, and the fourth mean is the average of the NOx measured values ​​at the SCR1 outlet and the NOx measured values ​​at the SCR2 outlet; the first difference = the third mean - the fourth mean.

[0157] Based on the historical data of multiple denitrification and ammonia injection, a third function is constructed, where the third function refers to the functional relationship between (third mean - fourth mean) * boiler flue gas volume and fixed coefficient. The comparison table of the third function relationship is shown in Table 3 below:

[0158] Table 3 (Third mean - fourth mean) *Functional relationship between smoke volume and fixed coefficient F

[0159] (Third mean - fourth mean) * smoke volume 50 100 200 400 Fixed coefficient 0.4 0.2 0.12 0.07

[0160] S1432: Input the input value of the third function through the third function to obtain the fixed coefficient.

[0161] According to the input value of the third function calculated in step S1431, the value is substituted into the third function and the corresponding fixed coefficient is output. It is worth noting that the input value of the third function = (third mean - fourth mean) * smoke volume.

[0162] In the above technical solution, the input value of the third function is first determined, and then the fixed coefficient is output based on the pre-constructed third function. This can provide reliable data support for calculating the theoretical ammonia injection amount for denitrification.

[0163] Figure 5 FIG. 4 shows a flow chart of a specific implementation of S150 in an exemplary embodiment. Figure 5 As shown, the method includes:

[0164] S151, obtaining the NOx set value at the SCR outlet.

[0165] Specifically, the NOx set value at the SCR outlet calculated in step S144 is obtained.

[0166] For example, a NOx set value at the outlet of SCR1 and a NOx set value at the outlet of SCR2 are obtained.

[0167] S152: Obtain a PID output value through PID calculation based on the NOx set value at the SCR outlet and the NOx actual measured value at the SCR outlet.

[0168] Specifically, based on the NOx setpoint at the SCR outlet obtained in step S151 and the measured NOx value at the SCR outlet obtained in step S110, the PID controller in the Guodian Zhishen EDPF-NT control system automatically adjusts the deviation between the two values ​​and outputs a PID output value ranging from 0 to 100. It is worth noting that the proportional coefficient and integral time of the proportional-integral controller were set based on field tests.

[0169] S153, inputting the PID output value through a pre-constructed fourth function to obtain a second correction coefficient, wherein the fourth function is a functional relationship established based on historical data.

[0170] According to the historical data of multiple denitrification and ammonia injection, the fourth function is constructed, wherein the fourth function refers to the PID output value and the second correction coefficient K i The comparison table of the fourth functional relationship is shown in Table 4 below:

[0171] Table 4 Functional relationship between PID output value and second correction coefficient

[0172] PID output value 0 50 100 <![CDATA[第二修正系数K i ]]> 0.7 1 1.3

[0173] According to the PID output value calculated in step S152, the value is brought into the fourth function and the corresponding second correction coefficient K is output. i .

[0174] For example, for SCR1, according to the NOx set value at the outlet of SCR1 and the NOx measured value at the outlet of SCR1, according to the deviation between the two, PID is automatically adjusted to output the PID output value of the SCR1 side, and the output value is 0-100. The PID output value is input as an input into the pre-built fourth function to obtain the second correction coefficient K on the SCR1 side. i1 For SCR2, according to the NOx set value at the outlet of SCR2 and the NOx measured value at the outlet of SCR2, according to the deviation between the two, PID is automatically adjusted to output the PID output value of the SCR2 side, and the output value is 0-100. The PID output value is input as the input to the pre-built fourth function to obtain the second correction coefficient K on the SCR2 side. i2 .

[0175] In the above technical solution, the PID output value is first determined, and then the second correction coefficient is output according to the pre-established fourth function. In this way, the theoretical ammonia injection amount error of the denitrification ammonia injection is calculated in advance, and the theoretical ammonia injection amount of the denitrification ammonia injection is corrected in advance.

[0176] Figure 6 FIG. 1 shows a schematic diagram of a denitrification ammonia injection advance control device provided by an exemplary embodiment. Figure 6 As shown, the denitrification ammonia injection advance control device 600 includes: a data acquisition module 610, a deviation module 620, an advance module 630, a theoretical ammonia injection amount calculation module 640, an actual ammonia injection amount calculation module 650 and a control module 660. Among them:

[0177] The data acquisition module 610 is used to obtain the NOx set value at the chimney inlet, the NOx measured value at the chimney inlet, the NOx measured value at the SCR inlet, the NOx measured value at the SCR outlet, and the oxygen content measured value at the boiler side;

[0178] The deviation module 620 is used to determine a deviation value according to the actual NOx value measured at the chimney inlet and the actual NOx value measured at the SCR outlet;

[0179] The leading module 630 is configured to determine a first correction coefficient based on the actual NOx value at the SCR inlet and the actual oxygen value at the boiler side, wherein the first correction coefficient represents a correction coefficient for a leading error between the actual oxygen value at the boiler side and the actual NOx value at the SCR inlet;

[0180] The theoretical ammonia injection amount calculation module 640 is used to determine the theoretical ammonia injection amount based on the NOx set value at the chimney inlet, the deviation value, and the actual NOx value at the SCR inlet; and to determine a second correction coefficient based on the NOx set value at the chimney inlet, the deviation value, and the actual NOx value at the SCR outlet, wherein the second correction coefficient represents a correction coefficient for the theoretical ammonia injection amount;

[0181] The actual ammonia injection amount calculation module 650 is used to determine the actual ammonia injection amount based on the first correction coefficient, the theoretical ammonia injection amount and the second correction coefficient;

[0182] The control module 660 is used to control the opening of the ammonia injection valve of the denitrification ammonia injection according to the actual ammonia injection amount.

[0183] Optionally, the deviation module 620 is further used to calculate the average value of the NOx measured value at the SCR outlet within a preset time range and the average value of the NOx measured value at the chimney inlet within a preset time range to obtain a first mean value and a second mean value, respectively; and to calculate the difference between the first mean value and the second mean value to obtain a deviation value.

[0184] Optionally, the look-ahead module 630 is further configured to calculate a first rate of change and a second rate of change, and to obtain an oxygen correction coefficient by inputting the first rate of change according to a pre-established first function, and to obtain a NOx correction coefficient by inputting the second rate of change according to a pre-established second function, and to calculate the product of the oxygen correction coefficient and the NOx correction coefficient to obtain the first correction coefficient. The first rate of change represents the rate of change per minute of the measured oxygen value at the boiler side, and the second rate of change represents the rate of change per minute of the measured NOx value at the SCR inlet. The first function and the second function are functional relationships established based on historical data.

[0185] Optionally, the theoretical ammonia injection amount calculation module 640 is further configured to calculate the sum of the total coal amount and the total air amount to obtain the boiler flue gas volume, determine a fixed coefficient based on the boiler flue gas volume, calculate the sum of the NOx set value at the chimney inlet and the deviation value to obtain the NOx set value at the SCR outlet, and calculate the theoretical ammonia injection amount based on the boiler flue gas volume, the fixed coefficient, the NOx set value at the SCR outlet, and the measured NOx value at the SCR inlet. The total coal amount and the total air amount are obtained from the DCS, with the total coal amount representing the actual total coal consumed by the boiler, and the total air amount representing the actual total air consumed by the boiler.

[0186] Optionally, the theoretical ammonia injection amount calculation module 640 is further configured to determine an input value of a pre-established third function based on the actual NOx value at the SCR inlet, the actual NOx value at the SCR outlet, and the boiler flue gas volume, and to obtain the fixed coefficient by inputting the input value of the third function through the third function. The third function is a functional relationship established based on historical data.

[0187] Optionally, the theoretical ammonia injection amount calculation module 640 is also used to calculate the average value of the NOx measured value at the SCR inlet as a third mean, and calculate the average value of the NOx measured value at the SCR outlet as a fourth mean, and calculate the difference between the third mean and the fourth mean as a first difference; calculate the product of the first difference and the boiler flue gas volume to obtain the input value of the third function.

[0188] Optionally, the theoretical ammonia injection amount calculation module 640 is further used to calculate the difference between the actual NOx value at the SCR inlet and the NOx set value at the SCR outlet as a second difference; and calculate the product of the second difference, the fixed coefficient and the boiler flue gas volume to obtain the theoretical ammonia injection amount.

[0189] Optionally, the data acquisition module 610 is also used to obtain the NOx set value of the SCR outlet, and the theoretical ammonia injection amount calculation module 640 is also used to obtain a PID output value through PID calculation based on the NOx set value of the SCR outlet and the actual NOx value of the SCR outlet, and input the PID output value through a pre-constructed fourth function to obtain a second correction coefficient, wherein the fourth function is a functional relationship established based on historical data.

[0190] Optionally, the actual ammonia injection amount calculation module 650 is further configured to calculate the product of the first correction coefficient, the theoretical ammonia injection amount, and the second correction coefficient to obtain the actual ammonia injection amount.

[0191] Regarding the apparatus in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0192] Figure 7 FIG. 7 shows a block diagram of an electronic device provided by an exemplary embodiment. For example, the electronic device 700 can be provided as a server. Figure 7 The electronic device 700 includes a processor 701, which may be one or more, and a memory 702 for storing a computer program executable by the processor 701. The computer program stored in the memory 702 may include one or more modules, each corresponding to a set of instructions. Furthermore, the processor 701 may be configured to execute the computer program to perform the aforementioned denitrification ammonia injection advance control method.

[0193] In addition, the electronic device 700 may further include a power supply component 703 and a communication component 704. The power supply component 703 may be configured to perform power management of the electronic device 700, and the communication component 704 may be configured to implement communication of the electronic device 700, for example, wired or wireless communication. In addition, the electronic device 700 may further include an input / output (I / O) interface 705. The electronic device 700 may operate based on an operating system stored in the memory 702, such as Windows Server 2003. TM , Mac OSX TM , Unix TM , Linux TM etc.

[0194] In another exemplary embodiment, a computer-readable storage medium including program instructions is further provided. When executed by a processor, the program instructions implement the steps of the aforementioned denitrification ammonia injection advance control method. For example, the non-transitory computer-readable storage medium may be the aforementioned memory 702 including the program instructions. The program instructions may be executed by the processor 701 of the electronic device 700 to implement the aforementioned denitrification ammonia injection advance control method.

[0195] In another exemplary embodiment, a computer program product is also provided, which includes a computer program that can be executed by a programmable device, and the computer program has a code portion for executing the above-mentioned denitrification ammonia injection advance control method when executed by the programmable device.

[0196] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0197] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0198] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A method for advanced control of denitrification ammonia injection, characterized in that: include: Obtain the NOx set value at the chimney inlet, the NOx measured value at the chimney inlet, the NOx measured value at the SCR inlet, the NOx measured value at the SCR outlet, and the oxygen content measured value on the boiler side; Determining a deviation value according to the actual measured NOx value at the chimney inlet and the actual measured NOx value at the SCR outlet; determining a first correction coefficient based on the actual NOx value at the SCR inlet and the actual oxygen content value at the boiler side, wherein the first correction coefficient represents a correction coefficient for a lead error between the actual oxygen content value at the boiler side and the actual NOx value at the SCR inlet; Determining a theoretical ammonia injection amount according to the NOx set value at the chimney inlet, the deviation value, and the NOx measured value at the SCR inlet; determining a second correction coefficient according to the NOx set value at the chimney inlet, the deviation value, and the NOx measured value at the SCR outlet, wherein the second correction coefficient represents a correction coefficient of the theoretical ammonia injection amount; determining an actual ammonia injection amount according to the first correction coefficient, the theoretical ammonia injection amount, and the second correction coefficient; controlling the opening of the ammonia injection regulating valve of the denitration ammonia injection according to the actual ammonia injection amount; The determining of the first correction coefficient according to the NOx measured value at the SCR inlet and the oxygen amount measured value at the boiler side includes: Calculating a first change rate and a second change rate, wherein the first change rate represents a change rate per minute of the oxygen content measured at the boiler side, and the second change rate represents a change rate per minute of the NOx measured at the SCR inlet; According to a pre-established first function, the first change rate is input to obtain an oxygen correction coefficient, wherein the first function is a functional relationship established based on historical data; According to a pre-established second function, the second change rate is input to obtain a NOx correction coefficient, wherein the second function is a functional relationship established based on the historical data; The product of the oxygen correction coefficient and the NOx correction coefficient is calculated to obtain the first correction coefficient.

2. The method according to claim 1, characterized in that The determining of the deviation value according to the actual measured NOx value at the chimney inlet and the actual measured NOx value at the SCR outlet includes: Calculating an average value of the NOx measured at the SCR outlet within a preset time range and an average value of the NOx measured at the chimney inlet within the preset time range to obtain a first average value and a second average value, respectively; The difference between the first mean and the second mean is calculated to obtain the deviation value.

3. The method according to claim 1, characterized in that The determining of the theoretical ammonia injection amount according to the NOx set value at the chimney inlet, the deviation value, and the NOx measured value at the SCR inlet includes: Obtaining a total coal amount and a total air amount, wherein the total coal amount represents an actual total coal amount consumed by the boiler, and the total air amount represents an actual total air amount consumed by the boiler; Calculating the sum of the total coal volume and the total air volume to obtain the boiler flue gas volume; determining a fixed coefficient according to the boiler flue gas volume; Calculating the sum of the NOx set value at the chimney inlet and the deviation value to obtain the NOx set value at the SCR outlet; The theoretical ammonia injection amount is calculated based on the boiler flue gas volume, the fixed coefficient, the NOx set value at the SCR outlet, and the NOx measured value at the SCR inlet.

4. The method according to claim 3, characterized in that Determining the fixed coefficient according to the boiler flue gas volume includes: Determining input values ​​of a pre-established third function based on the actual NOx value at the SCR inlet, the actual NOx value at the SCR outlet, and the boiler flue gas volume, wherein the third function is a functional relationship established based on historical data; The fixed coefficient is obtained by inputting the input value of the third function through the third function.

5. The method according to claim 4, characterized in that The step of determining the input value of the pre-constructed third function according to the NOx measured value at the SCR inlet, the NOx measured value at the SCR outlet, and the boiler flue gas volume includes: calculating an average value of the NOx values ​​measured at the SCR inlet as a third average value, and calculating an average value of the NOx values ​​measured at the SCR outlet as a fourth average value; Calculating a difference between the third mean and the fourth mean as a first difference; The product of the first difference and the boiler flue gas volume is calculated to obtain an input value of the third function.

6. The method according to claim 3, characterized in that The calculating of the theoretical ammonia injection amount according to the boiler flue gas volume, the fixed coefficient, the NOx set value at the SCR outlet, and the NOx measured value at the SCR inlet includes: Calculating a difference between a measured NOx value at the SCR inlet and a set NOx value at the SCR outlet as a second difference; The product of the second difference, the fixed coefficient, and the boiler flue gas volume is calculated to obtain the theoretical ammonia injection volume.

7. The method according to claim 1, characterized in that The determining of the second correction coefficient according to the NOx set value at the chimney inlet, the deviation value, and the NOx measured value at the SCR outlet includes: Get the NOx set value at the SCR outlet; Obtaining a PID output value through PID calculation according to the NOx set value at the SCR outlet and the NOx measured value at the SCR outlet; The second correction coefficient is obtained by inputting the PID output value through a pre-constructed fourth function, wherein the fourth function is a functional relationship established based on historical data.

8. The method according to claim 1, characterized in that The determining the actual ammonia injection amount according to the first correction coefficient, the theoretical ammonia injection amount, and the second correction coefficient includes: The actual ammonia injection amount is obtained by calculating the product of the first correction coefficient, the theoretical ammonia injection amount, and the second correction coefficient.

9. A denitrification ammonia injection advance control device, characterized in that: include: The data acquisition module is used to obtain the NOx set value at the chimney inlet, the NOx measured value at the chimney inlet, the NOx measured value at the SCR inlet, the NOx measured value at the SCR outlet, and the oxygen content measured value at the boiler side; a deviation module, configured to determine a deviation value based on the NOx measured value at the chimney inlet and the NOx measured value at the SCR outlet; an advance module, configured to determine a first correction coefficient based on the actual NOx value at the SCR inlet and the actual oxygen content value at the boiler side, wherein the first correction coefficient represents a correction coefficient for a lead error between the actual oxygen content value at the boiler side and the actual NOx value at the SCR inlet; a theoretical ammonia injection amount calculation module, configured to determine the theoretical ammonia injection amount according to the NOx set value at the chimney inlet, the deviation value, and the NOx measured value at the SCR inlet; and for determining a second correction coefficient according to the NOx set value at the chimney inlet, the deviation value, and the NOx measured value at the SCR outlet, wherein the second correction coefficient represents a correction coefficient for the theoretical ammonia injection amount; an actual ammonia injection amount calculation module, configured to determine an actual ammonia injection amount based on the first correction coefficient, the theoretical ammonia injection amount, and the second correction coefficient; A control module, configured to control the opening of the ammonia injection regulating valve of the denitration ammonia injection according to the actual ammonia injection amount; The advance module is also used to calculate a first change rate and a second change rate, and to input the first change rate according to a pre-constructed first function to obtain an oxygen correction coefficient, wherein the first function is a functional relationship established based on historical data, and to input the second change rate according to a pre-constructed second function to obtain a NOx correction coefficient, and to calculate the product of the oxygen correction coefficient and the NOx correction coefficient to obtain the first correction coefficient, wherein the first change rate represents the change rate per minute of the actual measured oxygen value on the boiler side, and the second change rate represents the change rate per minute of the actual measured NOx value at the SCR inlet, and the second function is a functional relationship established based on the historical data.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

11. An electronic device, characterized in that: include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to any one of claims 1 to 8.

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