Automatic ammonia spraying control method and device for flue gas denitration and readable storage medium

Abstract

The invention belongs to the technical field of boiler flue gas treatment, and particularly provides an automatic ammonia spraying control method and device for flue gas denitration and a readable storage medium. The automatic ammonia spraying control method for flue gas denitration comprises the steps that oxygen content information in boiler flue gas is obtained; acquiring an ammonia spraying adjusting instruction according to the oxygen content information; and adjusting the opening degree of the ammonia spraying adjusting valve according to the ammonia spraying adjusting instruction to complete advanced control of the ammonia spraying amount. The oxygen content in the flue gas is detected, the ammonia spraying amount is controlled in advance according to the oxygen content, and the opening degree of the ammonia spraying adjusting valve is increased or decreased, so that the effect of intervention in advance is achieved, the content of NOX in the denitrated flue gas is effectively inhibited, and the emission requirement is met.

Description

Technical Field

[0001] The present invention belongs to the technical field of boiler flue gas treatment, and in particular relates to an automatic ammonia spraying control method and device for flue gas denitration, and a readable storage medium. Background Art

[0002] In industrial facilities such as coal-fired boilers, flue gas emissions are one of the main sources of nitrogen oxide (NOX) emissions.

[0003] In order to meet the requirements of boiler flue gas NOX emission, the boiler flue gas needs to be denitrated by SCR outside the furnace. The denitration process is carried out by the Selective Catalytic Reduction (SCR) denitration process. The process mainly includes urea solution preparation → urea solution injection (regulating valve) → pyrolysis in pyrolysis furnace → ammonia after pyrolysis enters the flue gas denitration catalyst → flue gas denitration.

[0004] Urea solution injection regulation is the key to the entire denitrification process. Due to the influence of factors such as the uncertainty of boiler flue gas NOX changes, obvious hysteresis, poor characteristics of the ammonia injection valve, etc., it is easy to make untimely adjustments or over-adjustments, resulting in excessive NOX values ​​after flue gas denitrification.

[0005] Therefore, how to adjust the injection amount of urea solution to reduce the NOX value after flue gas denitrification is a technical problem that needs to be solved urgently.

[0006] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the invention

[0007] The embodiments of the present disclosure at least provide a method, a device and a readable storage medium for automatic ammonia injection control for flue gas denitrification.

[0008] In a first aspect, an embodiment of the present disclosure provides a method for controlling automatic ammonia injection for flue gas denitrification, the control method comprising:

[0009] Obtain information on oxygen content in boiler flue gas;

[0010] Obtain ammonia injection adjustment instructions based on oxygen content information;

[0011] The opening of the ammonia injection regulating valve is adjusted according to the ammonia injection regulating instruction to achieve advance control of the ammonia injection amount.

[0012] In an optional implementation, the method for obtaining an ammonia injection adjustment instruction based on oxygen content information includes:

[0013] Calculating an oxygen differential feedforward signal based on oxygen content information;

[0014] The oxygen amount differential feed-forward signal is input into the PID regulator to obtain the ammonia injection adjustment instruction.

[0015] In an optional embodiment, the method for calculating the oxygen differential feedforward signal based on the oxygen content information is:

[0016] Performing differential processing on the acquired oxygen content signal;

[0017] The oxygen content signal after the differential processing is multiplied by the differential coefficient to obtain the oxygen content differential feedforward signal.

[0018] In an optional implementation, the method for obtaining an ammonia injection adjustment instruction based on oxygen content information further includes:

[0019] Obtain NOX target setting value;

[0020] Detect the NOX content in the flue gas after denitrification and obtain the NOX measurement value;

[0021] The parameters of the PID regulator are adjusted according to the NOX measurement value and the NOX target setting value.

[0022] In a second aspect, the present disclosure also provides an automatic ammonia spraying control device for flue gas denitrification, comprising:

[0023] An oxygen detection module, which is configured to detect oxygen content information in boiler flue gas;

[0024] A control module configured to obtain an ammonia injection adjustment instruction according to the oxygen content information;

[0025] The execution module is configured to adjust the opening of the ammonia injection regulating valve according to the ammonia injection regulating instruction to complete the advance control of the ammonia injection amount.

[0026] In an optional implementation, the control module includes:

[0027] A differential feedforward calculation unit is configured to calculate an oxygen differential feedforward signal according to the oxygen content information;

[0028] The PID regulator is configured to obtain an ammonia injection regulation instruction according to an oxygen amount differential feedforward signal.

[0029] In an optional implementation, the control module further includes:

[0030] A first acquisition unit configured to acquire a NOx target setting value;

[0031] A second acquisition unit is configured to acquire a NOx measurement value according to the NOx content in the flue gas after denitration;

[0032] The regulating unit is configured to regulate the parameters of the PID regulator according to the NOx measurement value and the NOx target setting value.

[0033] In a third aspect, the present disclosure also provides a flue gas denitrification system, including:

[0034] boiler furnace;

[0035] a denitration catalytic chamber, which is in communication with the boiler furnace;

[0036] a pyrolysis furnace, which is in communication with the denitration catalytic chamber;

[0037] A urea liquid supply pipe, which is connected to the pyrolysis furnace through an ammonia injection regulating valve;

[0038] An oxygen meter, which is arranged on a pipe connecting the boiler furnace and the denitration catalytic chamber and is used to detect oxygen content information in boiler flue gas;

[0039] A controller is electrically connected to the ammonia injection regulating valve and is configured to control the ammonia injection regulating valve according to the automatic ammonia injection control method for flue gas denitrification as described above.

[0040] In a fourth aspect, an embodiment of the present disclosure further provides a computer-readable storage medium having a computer program / instruction stored thereon, which, when executed by a processor, implements the steps of the automatic ammonia injection control method as described above.

[0041] In a fifth aspect, an embodiment of the present disclosure further provides a computer program product, including a computer program / instructions, which, when executed by a processor, implement the steps of the automatic ammonia injection control method as described above.

[0042] The beneficial effect of the present invention is that the automatic ammonia injection control method, device and readable storage medium for flue gas denitrification detect the oxygen content in the flue gas, and advance control the ammonia injection amount according to the oxygen content, increase or decrease the opening of the ammonia injection regulating valve, thereby achieving the effect of early intervention, effectively suppressing the NOx content in the flue gas after denitrification, and meeting the emission requirements.

[0043] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, this article specifically cites preferred embodiments and provides detailed descriptions as follows in conjunction with the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 A flow chart of an automatic ammonia injection control method for flue gas denitrification provided by an embodiment of the present disclosure;

[0047] Figure 2 A schematic diagram of the PID advance adjustment principle provided in an embodiment of the present disclosure;

[0048] Figure 3 A principle block diagram of an automatic ammonia spraying control device for flue gas denitrification provided in an embodiment of the present disclosure;

[0049] Figure 4 A principle block diagram of a control module of an automatic ammonia injection control device for flue gas denitrification provided in an embodiment of the present disclosure;

[0050] Figure 5 A principle block diagram of a flue gas denitration system provided in an embodiment of the present disclosure;

[0051] Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0054] To facilitate understanding of this embodiment, a model building method disclosed in the embodiment of the present disclosure is first introduced in detail. The execution subject of the automatic ammonia injection control method for flue gas denitrification provided in the embodiment of the present disclosure is generally a computer device with certain computing capabilities, and the computer device includes, for example: a terminal device or a server or other processing device, and the terminal device can be a user equipment (User Equipment, UE), a mobile device, a user terminal, a terminal, a cellular phone, a cordless phone, a personal digital assistant (Personal Digital Assistant, PDA), a handheld device, a computing device, a vehicle-mounted device, a wearable device, etc. In some possible implementations, the model building method can be implemented by a processor calling a computer-readable instruction stored in a memory.

[0055] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0056] See also Figure 1 At least one embodiment provides an automatic ammonia injection control method for flue gas denitrification, which detects the oxygen content in the flue gas and controls the ammonia injection amount in advance according to the oxygen content, increases or decreases the opening of the ammonia injection regulating valve, thereby achieving the effect of early intervention, effectively suppressing the NOx content in the flue gas after denitrification, and meeting the emission requirements.

[0057] Specifically, the automatic ammonia injection control method for flue gas denitrification includes the following steps:

[0058] S110: Obtaining oxygen content information in boiler flue gas.

[0059] Specifically, the oxygen content in the boiler flue gas is detected by setting an oxygen meter on the flue gas exhaust duct of the boiler furnace.

[0060] S120: Obtaining an ammonia injection adjustment instruction according to the oxygen content information.

[0061] See also Figure 2 Specifically, step S120 includes the following steps:

[0062] S121: Calculate the oxygen differential feedforward signal based on the oxygen content information.

[0063] Specifically, S121 includes the following steps: performing differential processing on the acquired oxygen content signal; multiplying the oxygen content signal after the differential processing by a differential coefficient to obtain an oxygen content differential feedforward signal.

[0064] S122: Input the oxygen differential feedforward signal into the PID regulator to obtain the ammonia injection adjustment instruction.

[0065] In some embodiments, step S120 further includes:

[0066] S123: Obtain NOx target setting value.

[0067] Specifically, the NOX target setting value is a manually input value.

[0068] S124: Detect the NOX content in the flue gas after denitration and obtain the NOX measurement value.

[0069] S125: Adjust the parameters of the PID regulator according to the NOx measurement value and the NOx target setting value.

[0070] It should be noted that the parameter adjustment process of the PID regulator belongs to the prior art, and the specific adjustment process is not described in this embodiment.

[0071] S130: adjusting the opening of the ammonia injection regulating valve according to the ammonia injection regulating instruction to complete the advance control of the ammonia injection amount.

[0072] See also Figure 3 At least one embodiment further provides an automatic ammonia injection control device for flue gas denitrification, comprising: an oxygen detection module, a control module and an execution module.

[0073] Specifically, the oxygen detection module is configured to detect the oxygen content information in the boiler flue gas. The oxygen content information detected by the oxygen detection module is sent to the control module.

[0074] The control module is configured to obtain an ammonia injection adjustment instruction according to the oxygen content information.

[0075] See also Figure 4 , wherein the control module includes the following units:

[0076] The differential feedforward calculation unit is configured to calculate the oxygen differential feedforward signal according to the oxygen content information. Specifically, the obtained oxygen content signal is differentially processed; the oxygen content signal after the differential processing is multiplied by the differential coefficient to obtain the oxygen differential feedforward signal.

[0077] The PID regulator is configured to obtain an ammonia injection regulation instruction according to an oxygen amount differential feedforward signal.

[0078] The first acquisition unit is configured to acquire a NOx target setting value. Specifically, the NOx target setting value is a manually input value.

[0079] The second acquisition unit is configured to acquire the NOx measurement value according to the NOx content in the flue gas after denitration. Specifically, the flue gas after denitration is detected by a NOx meter to acquire the NOx content, and the NOx content is sent to the second acquisition unit of the control module to acquire the NOx measurement value.

[0080] The adjustment unit is configured to adjust the parameters of the PID regulator according to the NOx measurement value and the NOx target setting value. It should be noted that the parameter adjustment process of the PID regulator belongs to the prior art, and the specific adjustment process is not described in this embodiment.

[0081] The execution module is configured to adjust the opening of the ammonia injection regulating valve according to the ammonia injection regulating instruction to complete the advance control of the ammonia injection amount.

[0082] Specifically, the ammonia injection regulating valve is a solenoid valve, which is electrically connected to the control module and controls its opening according to the ammonia injection regulating instruction issued by the control module, thereby achieving advanced control of the ammonia injection amount.

[0083] See also Figure 5 At least one embodiment further provides a flue gas denitrification system, comprising: a boiler furnace; a denitrification catalyst chamber, which is connected to the boiler furnace; a pyrolysis furnace, which is connected to the denitrification catalyst chamber; a urea liquid supply pipe, which is connected to the pyrolysis furnace through an ammonia injection regulating valve; an oxygen meter, which is arranged on a pipeline connecting the boiler furnace and the denitrification catalyst chamber, and is used to detect oxygen content information in the boiler flue gas; a controller, which is electrically connected to the ammonia injection regulating valve and is configured to control the ammonia injection regulating valve according to the above automatic ammonia injection control method for flue gas denitrification.

[0084] The oxygen meter is electrically connected to the controller and is suitable for sending the detected oxygen content information to the controller.

[0085] The controller is used to perform the following steps:

[0086] S121: Calculate the oxygen differential feedforward signal based on the oxygen content information.

[0087] Specifically, S121 includes the following steps: performing differential processing on the acquired oxygen content signal; multiplying the oxygen content signal after the differential processing by a differential coefficient to obtain an oxygen content differential feedforward signal.

[0088] S122: Input the oxygen differential feedforward signal into the PID regulator to obtain the ammonia injection adjustment instruction.

[0089] In some embodiments, the flue gas denitrification system further includes a NOx meter, which is disposed at the flue gas discharge port of the denitrification catalytic chamber.

[0090] The controller is also used to perform the following steps:

[0091] S123: Obtain NOx target setting value.

[0092] Specifically, the NOX target setting value is a manually input value.

[0093] S124: Detect the NOX content in the flue gas after denitration and obtain the NOX measurement value.

[0094] Specifically, the controller detects the NOX content in the flue gas after denitrification through a NOX meter, and obtains the NOX measurement value based on the NOX content.

[0095] S125: Adjust the parameters of the PID regulator according to the NOx measurement value and the NOx target setting value.

[0096] It should be noted that the parameter adjustment process of the PID regulator belongs to the prior art, and the specific adjustment process is not described in this embodiment.

[0097] Based on the same technical concept, at least one embodiment further provides an electronic device / computer device / computer equipment / computer system. Figure 6 As shown, it is a schematic diagram of the structure of an electronic device provided in an embodiment of the present disclosure, including: a processor, a memory and a bus; the memory is used to store execution instructions, including internal memory and external memory; the internal memory here is also called internal memory, which is used to temporarily store the calculation data in the processor, as well as the data exchanged with the external memory such as the hard disk. The processor exchanges data with the external memory through the internal memory. When the electronic device is running, the processor communicates with the memory through the bus, so that the processor can execute the steps of the automatic ammonia injection control method for flue gas denitrification shown in the above method embodiment.

[0098] At least one embodiment further provides a computer storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the automatic ammonia injection control method for selecting flue gas denitrification by the business scheme described in the above method embodiment are executed. The storage medium may be a volatile or non-volatile computer-readable storage medium.

[0099] At least one embodiment provides a computer program product of a business solution selection method, including a computer storage medium storing program code, wherein the instructions included in the program code can be used to execute the steps of the automatic ammonia injection control method for flue gas denitrification described in the above method embodiment. For details, please refer to the above method embodiment, which will not be repeated here.

[0100] In summary, the present invention provides an automatic ammonia spraying control method, device and readable storage medium for flue gas denitrification, wherein the automatic ammonia spraying control method for flue gas denitrification includes: obtaining oxygen content information in boiler flue gas; obtaining ammonia spraying adjustment instructions according to the oxygen content information; adjusting the opening of the ammonia spraying regulating valve according to the ammonia spraying adjustment instructions to complete the advance control of the ammonia spraying amount. By detecting the oxygen content in the flue gas and controlling the ammonia spraying amount in advance according to the oxygen content, the opening of the ammonia spraying regulating valve is increased or decreased, so as to achieve the effect of early intervention, effectively suppress the NOX content in the flue gas after denitrification, and meet the emission requirements.

[0101] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A method for controlling automatic ammonia injection for flue gas denitrification, characterized in that: The automatic ammonia injection control method comprises: Obtain information on oxygen content in boiler flue gas; Obtain ammonia injection adjustment instructions based on oxygen content information; The opening of the ammonia injection regulating valve is adjusted according to the ammonia injection regulating instruction to achieve advance control of the ammonia injection amount.

2. The automatic ammonia spraying control method for flue gas denitrification according to claim 1, characterized in that: The method for obtaining an ammonia injection adjustment instruction based on oxygen content information includes: Calculating an oxygen differential feedforward signal based on oxygen content information; The oxygen amount differential feed-forward signal is input into the PID regulator to obtain the ammonia injection adjustment instruction.

3. The automatic ammonia control method for flue gas denitrification according to claim 2, characterized in that: The method for calculating the oxygen differential feedforward signal based on the oxygen content information is as follows: Performing differential processing on the acquired oxygen content signal; The oxygen content signal after the differential processing is multiplied by the differential coefficient to obtain the oxygen content differential feedforward signal.

4. The automatic ammonia control method for flue gas denitrification according to claim 2, characterized in that: The method for obtaining an ammonia injection adjustment instruction according to oxygen content information further includes: Obtain NOX target setting value; Detect the NOX content in the flue gas after denitrification and obtain the NOX measurement value; The parameters of the PID regulator are adjusted according to the NOX measurement value and the NOX target setting value.

5. An automatic ammonia spraying control device for flue gas denitrification, characterized in that: include: An oxygen detection module, which is configured to detect oxygen content information in boiler flue gas; A control module configured to obtain an ammonia injection adjustment instruction according to the oxygen content information; The execution module is configured to adjust the opening of the ammonia injection regulating valve according to the ammonia injection regulating instruction to complete the advance control of the ammonia injection amount.

6. The automatic ammonia spraying control device for flue gas denitrification according to claim 5, characterized in that: The control module comprises: A differential feedforward calculation unit is configured to calculate an oxygen differential feedforward signal according to the oxygen content information; The PID regulator is configured to obtain an ammonia injection regulation instruction according to an oxygen amount differential feedforward signal.

7. The automatic ammonia spraying control device for flue gas denitrification according to claim 6, characterized in that: The control module also includes: A first acquisition unit configured to acquire a NOx target setting value; A second acquisition unit is configured to acquire a NOx measurement value according to the NOx content in the flue gas after denitration; The regulating unit is configured to regulate the parameters of the PID regulator according to the NOx measurement value and the NOx target setting value.

8. A flue gas denitrification system, characterized in that: include: boiler furnace; a denitration catalytic chamber, which is in communication with the boiler furnace; a pyrolysis furnace, which is in communication with the denitration catalytic chamber; A urea liquid supply pipe, which is connected to the pyrolysis furnace through an ammonia injection regulating valve; An oxygen meter, which is arranged on a pipe connecting the boiler furnace and the denitration catalytic chamber and is used to detect oxygen content information in boiler flue gas; A controller is electrically connected to the ammonia injection regulating valve and is configured to control the ammonia injection regulating valve according to the automatic ammonia injection control method for flue gas denitrification according to any one of claims 1 to 4.

9. A computer-readable storage medium having a computer program / instruction stored thereon, characterized in that: When the computer program / instructions are executed by a processor, the steps of the automatic ammonia injection control method according to claim 1 are implemented.

10. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the automatic ammonia injection control method according to claim 1 are implemented.

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