Flue gas denitrification control methods and related equipment for heating furnaces

Abstract

This invention discloses a method and related equipment for flue gas denitrification control in a heating furnace, relating to the field of flue gas denitrification in heating furnaces. It primarily addresses the problem that current flue gas denitrification control methods are highly susceptible to temperature fluctuations, resulting in poor performance. The method includes: acquiring the furnace temperature and nitrogen oxide concentration in the heat recovery section of the heating furnace; determining a target metering and distribution device based on the furnace temperature, wherein the target metering and distribution device is located in the heat recovery section of the heating furnace; and adjusting the nitrogen oxide concentration in the heat recovery section of the heating furnace based on the target metering and distribution device, wherein the target metering and distribution device includes an ammonia pump. This invention is used for the flue gas denitrification control process in heating furnaces.

Description

Technical Field

[0001] This invention relates to the field of flue gas denitrification in heating furnaces, and more particularly to a method and related equipment for controlling flue gas denitrification in heating furnaces. Background Technology

[0002] In the metallurgical industry, the heating furnace is the first process in the hot rolling production line, and the performance of the heated slab directly affects the slab rolling process and the quality of the finished product. The flue gas produced by the combustion in the heating furnace contains nitrogen oxides, and excessive nitrogen oxide levels seriously harm the natural environment. With increasingly stringent national environmental protection requirements, heating furnaces are increasingly equipped with flue gas denitrification systems. However, because the ammonia water in the denitrification system reacts optimally with nitrogen oxides within the range of 850℃-1050℃, excessively high or low temperatures will affect the denitrification effect. Large fluctuations in the heating furnace load also lead to large fluctuations in the flue gas temperature at the location of the ammonia water injection device, making it difficult to guarantee the optimal reaction temperature. Therefore, current flue gas denitrification control in heating furnaces is highly susceptible to temperature influences, resulting in unsatisfactory performance. Summary of the Invention

[0003] In view of the above problems, the present invention provides a method and related equipment for flue gas denitrification control of a heating furnace, the main purpose of which is to solve the problem that the current flue gas denitrification control of heating furnaces is easily affected by temperature and has poor effect.

[0004] To solve at least one of the above-mentioned technical problems, in a first aspect, the present invention provides a method for controlling flue gas denitrification in a heating furnace, the method comprising:

[0005] Obtain the furnace temperature and nitrogen oxide concentration in the heat recovery section of the heating furnace;

[0006] The target metering and distribution device is determined based on the furnace temperature, wherein the target metering and distribution device is installed in the heat recovery section of the heating furnace.

[0007] The concentration of nitrogen oxides in the heat recovery section of the heating furnace is adjusted based on the aforementioned target metering and distribution device, wherein the aforementioned target metering and distribution device includes an ammonia pump.

[0008] Optionally, there are at least two metering and dispensing devices, and the aforementioned device for determining the target metering and dispensing based on the furnace temperature includes:

[0009] When the furnace temperature is less than or equal to the preset furnace temperature, the first metering and dispensing device is selected as the target metering and dispensing device, wherein the distance between the first metering and dispensing device and the heating section of the furnace is less than the distance between the second metering and dispensing device and the heating section of the furnace.

[0010] When the furnace temperature is higher than the preset furnace temperature, the second metering and distributing device is selected as the target metering and distributing device, wherein the distance between the second metering and distributing device and the heating section of the heating furnace is greater than the distance between the first metering and distributing device and the heating section of the heating furnace.

[0011] Optionally, the above methods also include:

[0012] The ammonia pump speed is controlled based on the above nitrogen oxide concentration and relationship mapping table to regulate the ammonia release.

[0013] Optionally, the above-mentioned target metering and distribution device further includes a demineralized water pump, and the above-mentioned method further includes:

[0014] The speed of the ammonia pump is controlled to regulate the amount of ammonia released into the target metering and distribution device.

[0015] The speed of the demineralized water pump is controlled to regulate the amount of demineralized water released into the target metering and distribution device.

[0016] Optionally, the above methods also include:

[0017] With the above-mentioned demineralized water pump turned on, the above-mentioned ammonia water pump is also turned on.

[0018] If the ammonia pump is shut down, then the demineralized water pump is also shut down.

[0019] Optionally, the above methods also include:

[0020] Determine the number of heating furnaces to be put into operation;

[0021] The target metering and distribution device is determined based on the number of heating furnaces put into operation mentioned above.

[0022] Optionally, the aforementioned ammonia pump and demineralized water pump are metering variable frequency pumps.

[0023] Secondly, embodiments of the present invention also provide a flue gas denitrification control device for a heating furnace, comprising:

[0024] The acquisition unit is used to acquire the furnace temperature and nitrogen oxide concentration of the heat recovery section of the heating furnace;

[0025] A determining unit is used to determine the target metering and distribution device based on the furnace temperature, wherein the target metering and distribution device is located in the heat recovery section of the heating furnace.

[0026] An adjustment unit is used to adjust the nitrogen oxide concentration in the heat recovery section of the heating furnace based on the target metering and distribution device, wherein the target metering and distribution device includes an ammonia pump.

[0027] To achieve the above objectives, according to a third aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium comprising a stored program, wherein, when the program is executed by a processor, the steps of the above-described flue gas denitrification control method for a heating furnace are implemented.

[0028] To achieve the above objectives, according to a fourth aspect of the present invention, an electronic device is provided, comprising at least one processor and at least one memory connected to the processor; wherein the processor is configured to invoke program instructions in the memory to execute the steps of the above-described flue gas denitrification control method for a heating furnace.

[0029] By employing the above technical solution, the flue gas denitrification control method and related equipment for heating furnaces provided by this invention address the problem that current flue gas denitrification control for heating furnaces is highly susceptible to temperature influences and suffers from poor performance. This invention obtains the furnace temperature and nitrogen oxide concentration in the heat recovery section of the heating furnace; determines a target metering and distribution device based on the furnace temperature, wherein the target metering and distribution device is located in the heat recovery section of the heating furnace; and adjusts the nitrogen oxide concentration in the heat recovery section of the heating furnace based on the target metering and distribution device, wherein the target metering and distribution device includes an ammonia pump. In this solution, by installing at least two metering and distribution devices in the heat recovery section of the heating furnace, the metering and distribution device more suitable for the current temperature is automatically selected based on the flue gas temperature. The metering and distribution device includes an ammonia pump, ensuring that the ammonia injected into the furnace reacts with the nitrogen oxides in the flue gas at the optimal temperature. At this temperature, the ammonia injected into the heating furnace reacts with the nitrogen oxides in the flue gas to generate nitrogen gas, which is then discharged into the atmosphere, thus optimizing the reaction process between ammonia and nitrogen oxides in the denitrification system.

[0030] Correspondingly, the flue gas denitrification control device, equipment, and computer-readable storage medium for the heating furnace provided in the embodiments of the present invention also have the above-mentioned technical effects.

[0031] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0032] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0033] Figure 1 A schematic flowchart of a flue gas denitrification control method for a heating furnace provided in an embodiment of the present invention is shown.

[0034] Figure 2 A schematic diagram of a flue gas denitrification control system for a heating furnace provided in an embodiment of the present invention is shown.

[0035] Figure 3 This diagram shows a schematic block diagram of the composition of a flue gas denitrification control device for a heating furnace according to an embodiment of the present invention;

[0036] Figure 4 This diagram illustrates the composition of an electronic device for flue gas denitrification control of a heating furnace according to an embodiment of the present invention. Detailed Implementation

[0037] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0038] To address the problem that current flue gas denitrification control methods for heating furnaces are highly susceptible to temperature fluctuations and thus ineffective, this invention provides a flue gas denitrification control method for heating furnaces, such as... Figure 1 As shown, the method includes:

[0039] S101. Obtain the furnace temperature and nitrogen oxide concentration of the heat recovery section of the heating furnace;

[0040] For example, in this embodiment of the application, a temperature detection device is installed in the heat recovery section of the heating furnace to detect the temperature of the flue gas inside the furnace. The temperature detection device can be a thermocouple.

[0041] S102. A target metering and distribution device is determined based on the furnace temperature, wherein the target metering and distribution device is installed in the heat recovery section of the heating furnace.

[0042] For example, this application installs at least two metering and distribution devices in the heat recovery section of the heating furnace. The metering and distribution devices are automatically switched according to the furnace temperature detected in the heat recovery section, so as to achieve the optimal reaction temperature between the ammonia water injected into the furnace and the nitrogen oxides in the flue gas.

[0043] S103. Adjust the nitrogen oxide concentration in the heat recovery section of the heating furnace based on the above-mentioned target metering and distribution device, wherein the above-mentioned target metering and distribution device includes an ammonia pump.

[0044] For example, embodiments of this application can enable the denitrification system to use a target metering and distribution device more suitable for the current temperature under different heating furnace loads. Ammonia water injected into the heating furnace can react with ammonia oxides in the flue gas to generate nitrogen gas which is discharged into the atmosphere, thereby achieving the optimal denitrification effect and significant control effect. Each metering and distribution device of the denitrification system of the above-mentioned heating furnace has its own ammonia water injection device, which is arranged as a set above the furnace top of the heat recovery section of the heating furnace.

[0045] By employing the above technical solution, the flue gas denitrification control method for heating furnaces provided by this invention addresses the problem that current flue gas denitrification control methods are highly susceptible to temperature fluctuations and have poor effectiveness. This invention obtains the furnace temperature and nitrogen oxide concentration in the heat recovery section of the heating furnace; determines a target metering and distribution device based on the furnace temperature, wherein the target metering and distribution device is located in the heat recovery section of the heating furnace; and adjusts the nitrogen oxide concentration in the heat recovery section of the heating furnace based on the target metering and distribution device, wherein the target metering and distribution device includes an ammonia pump. In this solution, by installing at least two metering and distribution devices in the heat recovery section of the heating furnace, the metering and distribution device more suitable for the current temperature is automatically selected based on the flue gas temperature. The metering and distribution device includes an ammonia pump, ensuring that the ammonia injected into the furnace reacts with the nitrogen oxides in the flue gas at the optimal temperature. At this temperature, the ammonia injected into the heating furnace reacts with the nitrogen oxides in the flue gas to generate nitrogen gas, which is then discharged into the atmosphere.

[0046] In one embodiment, there are at least two metering and dispensing devices, and the device for determining the target metering and dispensing based on the furnace temperature includes:

[0047] When the furnace temperature is less than or equal to the preset furnace temperature, the first metering and dispensing device is selected as the target metering and dispensing device, wherein the distance between the first metering and dispensing device and the heating section of the furnace is less than the distance between the second metering and dispensing device and the heating section of the furnace.

[0048] When the furnace temperature is higher than the preset furnace temperature, the second metering and distributing device is selected as the target metering and distributing device, wherein the distance between the second metering and distributing device and the heating section of the heating furnace is greater than the distance between the first metering and distributing device and the heating section of the heating furnace.

[0049] For example, in the embodiment of this application, at least two metering and distribution devices are installed in the heat recovery section of the heating furnace, and the two metering and distribution devices are designed to automatically switch according to the flue gas temperature to select the optimal target metering and distribution device.

[0050] Temperature detection devices are installed around each metering and distribution unit to monitor the flue gas temperature inside the furnace where the unit is located. Each metering and distribution unit has independent ammonia and demineralized water distribution pipelines. Electric and manual valves are installed on the branch pipelines from the ammonia and demineralized water pumps to the metering and distribution units, enabling at least two metering and distribution units to automatically switch based on the detected flue gas temperature, ensuring that the ammonia injected into the furnace reacts with the nitrogen oxides in the flue gas at the optimal temperature. It is understood that the aforementioned temperature detection devices can be thermocouples.

[0051] For example, when the furnace temperature is less than or equal to the preset furnace temperature, indicating that the current furnace temperature has not reached the preset value and is low, a first metering and distribution device that is closer to the heating section of the furnace can be selected as the target metering and distribution device, thus achieving the optimal reaction temperature between the ammonia water injected into the furnace and the nitrogen oxides in the flue gas. When the furnace temperature is greater than the preset furnace temperature, indicating that the current furnace temperature has reached the preset value and is high, a second metering and distribution device that is farther from the heating section of the furnace (understandably, a second metering and distribution device that is farther from the heating section of the furnace is less affected by the heating section and therefore has a lower temperature) can be selected as the target metering and distribution device, thus achieving the optimal reaction temperature between the ammonia water injected into the furnace and the nitrogen oxides in the flue gas.

[0052] In summary, the embodiments of this application can ensure that the ammonia water injected into the furnace reacts with the nitrogen oxides in the flue gas at the optimal temperature, thus solving the problem that the load fluctuation of the heating furnace leads to the failure to achieve the denitrification effect.

[0053] In one embodiment, the above method further includes:

[0054] The ammonia pump speed is controlled based on the above nitrogen oxide concentration and relationship mapping table to regulate the ammonia release.

[0055] For example, in this embodiment of the application, the corresponding ammonia pump speed is set according to the concentration range of nitrogen oxides, and the concentration of nitrogen oxides in the flue gas of the heating furnace is controlled within the index range by controlling the speed of the ammonia pump.

[0056] It is understandable that the higher the speed of the ammonia pump, the higher the amount of ammonia released; the lower the speed of the ammonia pump, the less ammonia released.

[0057] For example, in the embodiments of this application, the concentration of nitrogen oxides is divided into N i There are three different intervals, and a corresponding ammonia pump speed n is set for each interval. i The amount of ammonia injected into the furnace is controlled by adjusting the speed of the ammonia pump. The zones can be refined according to the actual operating conditions of the heating furnace, which not only keeps nitrogen oxide emissions within the required range but also achieves low ammonia consumption, reducing energy costs.

[0058] Specifically, the above relationship mapping table is as follows:

[0059]

[0060] Furthermore, in this embodiment, a target value Sp for nitrogen oxides is set, and an actual detection value Pv for nitrogen oxides is obtained. When the actual detection value Pv for nitrogen oxides is greater than the target value Sp, the ammonia pump speed is increased proportionally. In this embodiment, the original ammonia pump speed n... i Based on the above, the amount of ammonia water injected is increased by 5%. Therefore, if the actual solubility of nitrogen oxides deviates from the required range, the amount of ammonia water injected can be increased appropriately to accelerate the reduction of nitrogen oxide concentration.

[0061] In one embodiment, the target metering and dispensing device further includes a demineralized water pump, and the method further includes:

[0062] The speed of the ammonia pump is controlled to regulate the amount of ammonia released into the target metering and distribution device.

[0063] The speed of the demineralized water pump is controlled to regulate the amount of demineralized water released into the target metering and distribution device.

[0064] For example, the target metering and dispensing device in this application embodiment is equipped with an ammonia pump and a demineralized water pump, which are used to transport ammonia water and demineralized water to the metering and dispensing device for mixing, and then send them to the ammonia water injection device for injection into the furnace. The ammonia water content used in the above scheme can be 20%. After being mixed and diluted with demineralized water, it is injected into the furnace. The ammonia water acts as a reducing agent, which can reduce nitrogen oxides in the flue gas into nitrogen gas and discharge it into the atmosphere.

[0065] like Figure 2 As shown, 1 is the main ammonia water pipeline, 2 is the ammonia water branch pipeline, 3 is the main demineralized water pipeline, 4 is the demineralized water branch pipeline, 5 is the ammonia water manual valve, 6 is the ammonia water electric valve A, 7 is the demineralized water manual valve, 8 is the demineralized water electric valve A, 9 is the ammonia water electric valve B, and 10 is the demineralized water electric valve B.

[0066] For example, the heat recovery section of the heating furnace is equipped with two rows of metering and distribution devices, namely metering and distribution device A and metering and distribution device B. Temperature detection devices A and B are installed around each row of metering and distribution devices to detect the flue gas temperature inside the furnace where the metering and distribution devices are located. The two rows of metering and distribution devices are provided with independent ammonia and demineralized water distribution pipelines. The ammonia branch pipeline 2 and the demineralized water branch pipeline 4 of the two rows of metering and distribution devices are connected to the main ammonia pipeline 1 and the main demineralized water pipeline 3, respectively. The branch pipelines of the two rows of metering and distribution devices are equipped with electric valves and manual valves. The ammonia branch pipeline of metering and distribution device A is also equipped with a manual valve 5 and an electric valve 6, and the demineralized water branch pipeline is equipped with a manual valve 7 and an electric valve 8. The ammonia branch pipeline and the demineralized water branch pipeline are connected to metering and distribution device A. Metering and distribution device A mixes the ammonia and demineralized water evenly and distributes them evenly into the injection device of ammonia injection device A. Similarly, the ammonia branch pipeline of metering and distribution device B is equipped with a manual valve (omitted in the figure) and an electric valve 9, and the demineralized water branch pipeline is equipped with a manual valve (omitted in the figure) and an electric valve 10. The ammonia branch pipeline (omitted in the figure) and the demineralized water branch pipeline (omitted in the figure) are connected to metering and distribution device B. Metering and distribution device B mixes the ammonia and demineralized water evenly and distributes them evenly into the spraying device of ammonia spraying device B.

[0067] The two rows of ammonia injection devices automatically switch based on the detected flue gas temperature, ensuring that the ammonia injected into the furnace reacts with the nitrogen oxides in the flue gas at the optimal temperature. The temperature detection device is a thermocouple. Specifically:

[0068] The switching condition is based on the flue gas temperature detected by the temperature detection device A, where the metering and distribution device A is located. When the detected temperature is greater than 1000℃, it automatically switches to the metering and distribution device B, that is, the electric valves 6 and 8 of the metering and distribution device A are closed, and the electric valves 9 and 10 of the metering and distribution device B are opened; when the detected temperature is less than 900℃, it automatically switches back to the metering and distribution device A, that is, the electric valves 6 and 8 of the metering and distribution device A are opened, and the electric valves 9 and 10 of the metering and distribution device B are closed.

[0069] In one embodiment, the above method further includes:

[0070] With the above-mentioned demineralized water pump turned on, the above-mentioned ammonia water pump is also turned on.

[0071] If the ammonia pump is shut down, then the demineralized water pump is also shut down.

[0072] For example, a safety interlock is installed between the aforementioned ammonia pump and the aforementioned demineralized water pump. The demineralized water pump is allowed to start after it starts, and is allowed to stop after the ammonia pump stops. This prevents excessive ammonia water from being injected into the furnace, thus avoiding ammonia escape exceeding the standard. Specifically, unreacted ammonia water is discharged into the atmosphere through the chimney, with an ammonia escape exceedance index of ≤8 mg / m³. 3 .

[0073] In practical applications, to avoid fluctuations in the denitrification system caused by frequent switching, the switching can be based on the number of heating furnaces in operation. For example, if the production line uses three heating furnaces, each with a moderate load, ammonia injection device A can be selected. If the production line uses two heating furnaces, due to the increased load and relatively higher flue gas temperature for each furnace, ammonia injection device B can be selected. Using the flue gas flow direction as a reference, ammonia injection device B is positioned after ammonia injection device A, meaning the flue gas temperature at ammonia injection device A is higher than that at ammonia injection device B. Thus, when the flue gas temperature from three heating furnaces is relatively low, the flue gas temperature at the location of ammonia injection device A reaches the optimal reaction temperature, and ammonia injection device A is selected. When two heating furnaces are in operation, the flue gas temperature is relatively high, the flue gas temperature at the location of ammonia injection device A is higher, and the flue gas temperature at the location of ammonia injection device B reaches the optimal reaction temperature, and ammonia injection device B is selected. The optimal reaction temperature for the denitrification system is 850-1050℃.

[0074] The ammonia pump and demineralized water pump are metering variable frequency pumps, ensuring that the delivered ammonia and demineralized water do not interfere with each other due to pressure changes. They also have a good check valve function, effectively preventing compressed air backflow when ammonia spraying stops. 。 Because diluted ammonia water needs to be atomized before being sprayed into the furnace to ensure sufficient contact with the flue gas, atomization is achieved by introducing compressed air into the spray gun. When ammonia water spraying stops, if the pressure in the ammonia water pipeline is low, compressed air may enter the ammonia water pipeline, affecting normal operation. This patent uses a metering variable frequency pump, which effectively avoids this situation, and its actual performance is significant. This denitrification system is equipped with a corresponding variable frequency system, enabling variable frequency speed control of the ammonia water pump and the demineralized water pump, while maintaining a relatively constant demineralized water pump speed. Operators can manually adjust the speeds of the ammonia water pump and the demineralized water pump through the HMI screen.

[0075] In one embodiment, the above method further includes:

[0076] Determine the number of heating furnaces to be put into operation;

[0077] The target metering and distribution device is determined based on the number of heating furnaces put into operation mentioned above.

[0078] For example, in actual operation, the number of heating furnaces in operation and their corresponding load requirements differ, leading to varying flue gas temperature changes at the ammonia injection device installation location. For instance, the temperature load from three heating furnaces is significantly less than that from one or two furnaces. Therefore, when a large number of heating furnaces are in operation, it indirectly reflects a lower furnace temperature in the heat recovery section, allowing a metering and distribution device closer to the heating section to be used as the target metering and distribution device. Conversely, when a small number of heating furnaces are in operation, it indirectly reflects a higher furnace temperature in the heat recovery section, allowing a metering and distribution device farther from the heating section to be used as the target metering and distribution device. Based on this solution, the ammonia injected into the furnace reacts with nitrogen oxides in the flue gas at the optimal temperature, solving the problem of insufficient denitrification caused by fluctuations in the furnace load.

[0079] In one embodiment, the ammonia pump and the demineralized water pump are metering variable frequency pumps.

[0080] For example, the aforementioned ammonia pump and demineralized water pump are metering variable frequency pumps. The ammonia and demineralized water being pumped will not interfere with each other due to pressure changes, and they have a good check valve function, effectively preventing the backflow of compressed air when ammonia spraying stops. 。 The denitrification system in this embodiment is configured with a corresponding frequency conversion system.

[0081] In summary, this application sets the corresponding ammonia pump speed according to the concentration range of nitrogen oxides. By controlling the speed of the ammonia pump, the concentration of nitrogen oxides in the flue gas of the heating furnace is controlled within the target range. This application adds at least one set of metering and distribution devices and corresponding temperature detection devices to the original denitrification system. This allows the metering and distribution devices to be automatically switched according to the flue gas temperature, so that the ammonia injected into the furnace and the nitrogen oxides in the flue gas can be at the optimal reaction temperature. This solves the problem that the load fluctuation of the heating furnace causes the denitrification effect to be not achieved.

[0082] Furthermore, as a response to the above Figure 1 In addition to the implementation of the method shown, this embodiment of the invention also provides a flue gas denitrification control device for a heating furnace, used for the above-mentioned... Figure 1 The method shown is implemented accordingly. This device embodiment corresponds to the foregoing method embodiment. For ease of reading, this device embodiment will not repeat the details of the foregoing method embodiment, but it should be clear that the device in this embodiment can implement all the contents of the foregoing method embodiment. Figure 3 As shown, the device includes: an acquisition unit 21, a determination unit 22, and an adjustment unit 23, wherein...

[0083] Acquisition unit 21 is used to acquire the furnace temperature and nitrogen oxide concentration of the heat recovery section of the heating furnace;

[0084] The determining unit 22 is used to determine the target metering and distribution device based on the furnace temperature, wherein the target metering and distribution device is installed in the heat recovery section of the heating furnace.

[0085] The regulating unit 23 is used to regulate the nitrogen oxide concentration in the heat recovery section of the heating furnace based on the target metering and distribution device, wherein the target metering and distribution device includes an ammonia pump.

[0086] The processor contains a kernel, which retrieves the corresponding program unit from memory. One or more kernels can be configured, and by adjusting kernel parameters, a method for controlling flue gas denitrification in a heating furnace can be implemented. This method can solve the problem that current flue gas denitrification control in heating furnaces is highly susceptible to temperature fluctuations and therefore ineffective.

[0087] This invention provides a computer-readable storage medium including a stored program that, when executed by a processor, implements the flue gas denitrification control method for the heating furnace.

[0088] This invention provides a processor for running a program, wherein the program executes the flue gas denitrification control method of the heating furnace.

[0089] This invention provides an electronic device, which includes at least one processor and at least one memory connected to the processor; wherein the processor is used to call program instructions in the memory to execute the flue gas denitrification control method for the heating furnace described above.

[0090] This invention provides an electronic device 30, such as... Figure 4 As shown, the electronic device includes at least one processor 301, and at least one memory 302 and bus 303 connected to the processor; wherein, the processor 301 and the memory 302 communicate with each other through the bus 303; the processor 301 is used to call program instructions in the memory to execute the above-mentioned flue gas denitrification control method of the heating furnace.

[0091] The smart electronic devices mentioned in this article can be PCs, tablets, mobile phones, etc.

[0092] This application also provides a computer program product that, when executed on a process management electronic device, is suitable for executing a program that initializes the steps of the flue gas denitrification control method for the aforementioned heating furnace.

[0093] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0094] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0095] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0096] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0097] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0098] This application also provides a computer program product, which includes computer software instructions that, when executed on a processing device, cause the processing device to perform actions such as... Figure 1 The control flow of the memory in the corresponding embodiment.

[0099] A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state disk (SSD)).

[0100] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0101] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between apparatuses or units, and may be electrical, mechanical, or other forms.

[0102] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0103] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0104] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0105] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method for controlling the flue gas denitration of a heating furnace, characterized by, include: Obtain the furnace temperature and nitrogen oxide concentration in the heat recovery section of the heating furnace; The target metering and distribution device is determined based on the furnace temperature, wherein the target metering and distribution device is located in the heat recovery section of the heating furnace; The concentration of nitrogen oxides in the heat recovery section of the heating furnace is adjusted based on the target metering and distribution device. The target metering and distribution device includes an ammonia pump and a demineralized water pump. The ammonia pump and demineralized water pump are installed in the target metering and distribution device to transport ammonia water and demineralized water to the metering and distribution device for mixing, and then to the ammonia water injection device to be injected into the furnace. The metering and dispensing device is at least two, and the device for determining the target metering and dispensing based on the furnace temperature includes: When the furnace temperature is less than or equal to the preset furnace temperature, a first metering and distributing device is selected as the target metering and distributing device, wherein the distance between the first metering and distributing device and the heating section of the furnace is less than the distance between the second metering and distributing device and the heating section of the furnace. When the furnace temperature is greater than the preset furnace temperature, the second metering and distributing device is selected as the target metering and distributing device, wherein the distance between the second metering and distributing device and the heating section of the heating furnace is greater than the distance between the first metering and distributing device and the heating section of the heating furnace.

2. The method of claim 1, wherein, Also includes: The ammonia pump speed is controlled based on the nitrogen oxide concentration and relationship mapping table to regulate the ammonia release.

3. The method of claim 1, wherein, The target metering and dispensing device further includes a demineralized water pump, and the method further includes: The speed of the ammonia pump is controlled to regulate the amount of ammonia released into the target metering and dispensing device; The speed of the demineralized water pump is controlled to regulate the amount of demineralized water released into the target metering and dispensing device.

4. The method according to claim 3, characterized in that, Also includes: With the demineralized water pump running, the ammonia water pump is also started. With the ammonia pump shut down, the demineralized water pump is also shut down.

5. The method according to claim 1, characterized in that, Also includes: Determine the number of heating furnaces to be put into operation; The target metering and distribution device is determined based on the number of heating furnaces put into operation.

6. The method according to claim 1, characterized in that, The ammonia pump and demineralized water pump are metering variable frequency pumps.

7. A flue gas denitrification control device for a heating furnace, characterized in that, include: The acquisition unit is used to acquire the furnace temperature and nitrogen oxide concentration of the heat recovery section of the heating furnace; A determining unit is used to determine a target metering and distribution device based on the furnace temperature, wherein the target metering and distribution device is located in the heat recovery section of the heating furnace; An adjustment unit is used to adjust the nitrogen oxide concentration in the heat recovery section of the heating furnace based on the target metering and distribution device. The target metering and distribution device includes an ammonia pump and a demineralized water pump, which are used to transport ammonia and demineralized water to the metering and distribution device for mixing, and then send them to the ammonia injection device for injection into the furnace. The metering and dispensing device is at least two, and the device for determining the target metering and dispensing based on the furnace temperature includes: When the furnace temperature is less than or equal to the preset furnace temperature, a first metering and distributing device is selected as the target metering and distributing device, wherein the distance between the first metering and distributing device and the heating section of the furnace is less than the distance between the second metering and distributing device and the heating section of the furnace. When the furnace temperature is greater than the preset furnace temperature, the second metering and distributing device is selected as the target metering and distributing device, wherein the distance between the second metering and distributing device and the heating section of the heating furnace is greater than the distance between the first metering and distributing device and the heating section of the heating furnace.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed by a processor, it implements the flue gas denitrification control method for a heating furnace as described in any one of claims 1 to 6.

9. An electronic device, characterized in that, The electronic device includes at least one processor and at least one memory connected to the processor; wherein the processor is used to call program instructions in the memory to execute the flue gas denitrification control method for the heating furnace as described in any one of claims 1 to 6.

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