A multi-parameter cooperative SCR ammonia injection control method, device, equipment and medium

Abstract

The embodiment of the application provides a kind of multi-parameter collaborative SCR ammonia injection control method, device, equipment and medium, related to coal-fired flue gas denitration technical field, method includes: obtaining the inlet flue gas flow and inlet nitrogen oxide concentration of flue gas inlet flue, according to inlet flue gas flow and inlet nitrogen oxide concentration, calculate theoretical ammonia nitrogen molar ratio;According to theoretical ammonia nitrogen molar ratio and ammonia water concentration correction coefficient, calculate basic ammonia injection amount;Obtain the reaction data of ammonia water and flue gas in reactor, based on reaction data, dynamically adjust basic ammonia injection amount to obtain final ammonia injection amount, and adjust the ammonia injection amount of ammonia injection pipeline to final ammonia injection amount.The application can realize the accurate and efficient control of the ammonia injection amount of SCR ammonia water denitration system.

Description

Technical Field

[0001] This invention relates to the field of flue gas denitrification technology, and more specifically, to a multi-parameter synergistic SCR ammonia injection control method, device, equipment, and medium. Background Technology

[0002] With increasingly stringent environmental regulations, nitrogen oxides (NOx), as a major air pollutant, have made emission control one of the core tasks in industrial pollution source management. SCR ammonia denitrification technology, due to its high denitrification efficiency, strong adaptability, and mature technology, has become the mainstream technology for NOx reduction from stationary sources. The core principle of this technology is that, under the action of a catalyst, ammonia water acts as a reducing agent to undergo a selective catalytic reduction reaction with NOx in flue gas, generating pollution-free nitrogen and water, thereby achieving NOx purification and removal.

[0003] In the operation of an SCR ammonia denitrification system, the ammonia injection rate is a key process parameter that determines the denitrification effect, operating cost, and risk of secondary pollution. Insufficient ammonia injection leads to low denitrification efficiency, failing to meet NOx emission limits; excessive ammonia injection wastes ammonia, increases operating costs, and can react with SO3 in the flue gas to form ammonium salts (such as ammonium bisulfate), causing catalyst blockage, air preheater corrosion, and other equipment malfunctions. It can also lead to excessive ammonia escape, causing secondary air pollution. Therefore, precise control of the ammonia injection rate is a core prerequisite for ensuring the efficient, stable, and economical operation of the SCR denitrification system.

[0004] In existing technologies, the amount of ammonia injected is usually controlled based on a small number of parameters, which can easily lead to large deviations in the amount of ammonia injected, resulting in fluctuations in denitrification efficiency or excessive ammonia escape. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a multi-parameter coordinated SCR ammonia injection control method, device, equipment and medium to solve the problem that existing ammonia removal technology may cause fluctuations in denitrification efficiency or excessive ammonia escape.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides a multi-parameter coordinated SCR ammonia injection control method applied to a denitrification equipment. The denitrification equipment includes a reactor, a flue gas inlet duct, a flue gas outlet duct, and an ammonia injection pipeline. One end of the reactor is mechanically connected to the flue gas inlet duct, and the other end of the reactor is mechanically connected to the flue gas outlet duct. The ammonia injection pipeline is disposed within the flue gas inlet duct, which is used to transport flue gas to the reactor. The ammonia injection pipeline is used to inject ammonia water into the flue gas inlet duct. The reactor is used for the reaction between the ammonia water and the flue gas. The method includes: Obtain the inlet flue gas flow rate and inlet nitrogen oxide concentration of the flue gas inlet duct, and calculate the theoretical ammonia-nitrogen molar ratio based on the inlet flue gas flow rate and inlet nitrogen oxide concentration; The basic ammonia injection rate is calculated based on the theoretical ammonia-nitrogen molar ratio and the ammonia concentration correction factor. The reaction data of ammonia water and flue gas in the reactor are obtained, and the basic ammonia injection rate is dynamically adjusted based on the reaction data to obtain the final ammonia injection rate. The ammonia injection rate of the ammonia injection pipeline is then adjusted to the final ammonia injection rate.

[0007] In an optional implementation, the step of calculating the theoretical ammonia-nitrogen molar ratio based on the inlet flue gas flow rate and the inlet nitrogen oxide concentration includes: Obtain the outlet flue gas flow rate and the outlet nitrogen oxide concentration threshold of the flue gas outlet duct; A theoretical molar ratio calculation function for ammonia nitrogen is constructed based on the inlet flue gas flow rate, the inlet nitrogen oxide concentration, the outlet flue gas flow rate, and the outlet nitrogen oxide concentration threshold.

[0008] In an optional implementation, the theoretical molar ratio of ammonia to nitrogen is calculated as follows: Theoretical ammonia-nitrogen molar ratio = (inlet nitrogen oxide concentration × inlet flue gas flow rate) / (inlet nitrogen oxide concentration × inlet flue gas flow rate - outlet nitrogen oxide concentration threshold × outlet flue gas flow rate).

[0009] In an optional implementation, the step of calculating the basic ammonia injection amount based on the theoretical ammonia-nitrogen molar ratio and the ammonia concentration correction factor includes, as follows: Basic ammonia injection rate = theoretical ammonia-nitrogen molar ratio × inlet nitrogen oxide concentration × inlet flue gas flow rate × ammonia water concentration correction factor.

[0010] In an optional embodiment, the step of obtaining reaction data of ammonia water and flue gas in the reactor includes: The catalyst operating time and reactor bed temperature of ammonia water and flue gas are obtained, and a catalyst activity correction coefficient is generated based on the catalyst operating time and reactor bed temperature. The flue gas temperature and the optimal reaction temperature of the catalyst in the reactor are obtained, and a flue gas temperature correction coefficient is generated based on the flue gas temperature and the optimal reaction temperature of the catalyst. Obtain the oxygen content of the inlet flue gas in the flue gas inlet duct, and generate an oxygen content correction coefficient based on the oxygen content of the inlet flue gas.

[0011] In an optional implementation, the step of dynamically adjusting the basic ammonia injection rate based on the reaction data to obtain the final ammonia injection rate includes: The final ammonia injection rate calculation function is generated based on the catalyst activity correction coefficient, the flue gas temperature correction coefficient, and the oxygen content correction coefficient: The final ammonia injection rate calculation function is: base ammonia injection rate × catalyst activity correction factor × flue gas temperature correction factor × oxygen content correction factor.

[0012] In an optional embodiment, after the step of adjusting the ammonia injection rate of the ammonia injection pipeline to the final ammonia injection rate, the method further includes: Obtain the nitrogen oxide concentration and ammonia escape rate at the outlet of the flue gas duct; If the outlet nitrogen oxide concentration is greater than the outlet nitrogen oxide concentration threshold, the ammonia injection rate is increased by the first preset step size. If the outlet nitrogen oxide concentration is less than the outlet nitrogen oxide concentration threshold and the ammonia escape amount is greater than the ammonia escape amount threshold, then the amount of ammonia injected in loss is reduced according to the second preset step size.

[0013] Secondly, the present invention provides a multi-parameter coordinated SCR ammonia injection control device, comprising: The data acquisition module is used to acquire the inlet flue gas flow rate and inlet nitrogen oxide concentration of the flue gas inlet duct, and to calculate the theoretical ammonia-nitrogen molar ratio based on the inlet flue gas flow rate and inlet nitrogen oxide concentration; The data calculation module is used to calculate the basic ammonia injection amount based on the theoretical ammonia-nitrogen molar ratio and the ammonia concentration correction coefficient. The dynamic adjustment module is used to acquire reaction data of ammonia water and flue gas in the reactor, dynamically adjust the basic ammonia injection rate based on the reaction data to obtain the final ammonia injection rate, and adjust the ammonia injection rate of the ammonia injection pipeline to the final ammonia injection rate.

[0014] Thirdly, the present invention provides an electronic device including a processor and a memory, the memory storing machine-executable instructions that can be executed by the processor, the processor executing the machine-executable instructions to implement the multi-parameter coordinated SCR ammonia injection control method described in the first aspect.

[0015] Fourthly, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the multi-parameter coordinated SCR ammonia injection control method described in the first aspect.

[0016] This invention provides a multi-parameter collaborative SCR ammonia injection control method, device, equipment, and medium. It adopts a precise ammonia injection quantity control system that combines multi-parameter collaborative sensing and intelligent regulation. By integrating multi-dimensional influencing factors such as flue gas conditions, reaction status, and equipment parameters, a dynamic ammonia injection quantity calculation model is established. Combined with real-time closed-loop feedback regulation and operating condition adaptive correction strategies, the precise and efficient control of ammonia injection quantity in the SCR ammonia denitrification system is achieved.

[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A block diagram of an electronic device provided by an embodiment of the present invention is shown; Figure 2 A schematic diagram of a denitrification device provided in an embodiment of the present invention is shown; Figure 3 A flowchart illustrating a multi-parameter coordinated SCR ammonia injection control method provided by an embodiment of the present invention is shown. Figure 4 The diagram shows a functional block diagram of a multi-parameter coordinated SCR ammonia injection control device provided in an embodiment of the present invention.

[0020] icon: 100 - Electronic equipment; 110 - Memory; 120 - Processor; 130 - Communication module; 210 - Ammonia injection pipeline; 220 - Flue gas inlet duct; 230 - Reactor; 240 - Flue gas outlet duct; 400 - Multi-parameter coordinated SCR ammonia injection control device; 410 - Data acquisition module; 420 - Data calculation module; 430 - Dynamic adjustment module. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0024] In existing technologies, the ammonia injection rate control for SCR ammonia denitrification mostly adopts a dual-parameter proportional control mode of "flue gas flow rate + inlet NOx concentration". This means that the required ammonia injection rate is calculated based on the real-time collected flue gas flow rate and inlet NOx concentration according to a preset ammonia-nitrogen molar ratio (NSR), and the ammonia injection rate is controlled by adjusting the opening of the ammonia injection valve. However, this control method has several drawbacks: Firstly, this mode does not fully consider key influencing factors such as flue gas temperature, catalyst activity, and fluctuations in the target NOx concentration at the outlet. These factors directly change the NOx reduction reaction efficiency, leading to a significant deviation between the ammonia injection rate calculated according to a fixed ratio and the actual demand. Secondly, the feedback regulation of existing control systems has a strong lag, typically relying only on inlet parameters for adjustment and lacking a real-time closed-loop correction mechanism for the outlet NOx concentration. When operating conditions (such as boiler load and fuel composition) change abruptly, the ammonia injection rate adjustment is prone to be untimely, leading to fluctuations in denitrification efficiency or excessive ammonia escape.

[0025] Furthermore, existing technologies lack adaptive control strategies for different operating conditions. Flue gas parameters (flow rate, NOx concentration, temperature) from stationary sources such as industrial boilers and coal-fired power plants fluctuate significantly with load changes and fuel switching. Single control parameters and adjustment coefficients cannot adapt to the requirements of full-condition operation, resulting in a significant decrease in the control accuracy of the system under extreme conditions such as low load and high load.

[0026] To address the problems in the prior art, this embodiment provides an electronic device.

[0027] Please refer to Figure 1 , Figure 1 This is a block diagram of an electronic device 100 provided in this embodiment. The electronic device 100 includes a memory 110, a processor 120, and a communication module 130. The memory 110, processor 120, and communication module 130 are electrically connected to each other directly or indirectly to realize data transmission or interaction. For example, these components can be electrically connected to each other through one or more communication buses or signal lines.

[0028] The memory 110 is used to store programs or data. The memory 110 may be, but is not limited to, random access memory (RAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), etc.

[0029] The processor 120 is used to read / write data or programs stored in the memory 110 and to perform corresponding functions.

[0030] The communication module 130 is used to establish a communication connection between the server and other communication terminals through the network, and to send and receive data through the network.

[0031] It should be understood that, Figure 1 The structure shown is only a schematic diagram of the electronic device 100. The electronic device 100 may also include components that are larger than... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown. Figure 1 The components shown can be implemented using hardware, software, or a combination thereof.

[0032] Please refer to Figure 2 , Figure 2 This is a schematic diagram of a denitrification device provided in this embodiment.

[0033] The denitrification equipment mainly includes a reactor 230, a flue gas inlet duct 220, a flue gas outlet duct 240, and an ammonia injection pipeline 210. One end of the reactor 230 is mechanically connected to the flue gas inlet duct 220, and the other end of the reactor 230 is mechanically connected to the flue gas outlet duct 240. The ammonia injection pipeline 210 is located inside the flue gas inlet duct 220. The flue gas inlet duct 220 is mainly connected to the boiler economizer and is used to transport the undenitrified flue gas from the boiler to the reactor 230. The ammonia injection pipeline 210 is used to inject ammonia water into the flue gas inlet duct 220, and the reactor 230 is used for the reaction between the ammonia water and the flue gas.

[0034] Please refer to Figure 3 , Figure 3 This is a flowchart illustrating a multi-parameter coordinated SCR ammonia injection control method provided in this embodiment. This method is applied to... Figure 2 In the denitrification equipment shown, the method includes: S310. Obtain the inlet flue gas flow rate and inlet nitrogen oxide concentration of the flue gas inlet duct, and calculate the theoretical ammonia-nitrogen molar ratio based on the inlet flue gas flow rate and inlet nitrogen oxide concentration.

[0035] Firstly, multiple sets of high-precision sensors can be installed in the flue gas inlet duct, inside the reactor, flue gas outlet duct, and ammonia injection pipeline of the denitrification equipment to build a full-process parameter acquisition network. The core parameters collected include flue gas operating parameters, reaction status parameters, equipment operating parameters, and control parameters.

[0036] The flue gas operating parameters include: inlet flue gas flow rate, inlet nitrogen oxide concentration, inlet flue gas temperature, and inlet flue gas oxygen content; outlet flue gas flow rate, outlet nitrogen oxide concentration, and outlet flue gas temperature.

[0037] The reaction state parameters include catalyst bed temperature and catalyst running time. Catalyst running time is mainly used to assess the degree of catalyst activity decay.

[0038] The equipment operating parameters include: ammonia concentration, ammonia supply pressure, ammonia injection valve opening, and current ammonia-nitrogen molar ratio.

[0039] The control target parameters include: the outlet nitrogen oxide concentration limit and the maximum allowable ammonia slip, which is generally set to less than or equal to 2 ppm.

[0040] First, the theoretical ammonia-nitrogen molar ratio can be calculated based on the inlet flue gas flow rate and the inlet nitrogen oxide concentration. The inlet flue gas flow rate and the inlet nitrogen oxide concentration reflect the total amount of nitrogen oxides contained in the flue gas, for example, the amount of nitrogen oxides contained in the flue gas per second.

[0041] S320. Calculate the basic ammonia injection amount based on the theoretical ammonia-nitrogen molar ratio and ammonia concentration correction factor.

[0042] Since nitrogen oxides in flue gas need to react with ammonia water to complete denitrification, the required amount of ammonia water can be calculated after obtaining the theoretical ammonia-nitrogen molar ratio. Because ammonia water is usually sprayed during denitrification to facilitate a full reaction with nitrogen oxides, and the concentration of ammonia water itself may fluctuate, a corresponding ammonia water concentration correction factor needs to be set according to the actual situation and included in the calculation process to obtain an accurate basic ammonia injection amount.

[0043] S330. Obtain the reaction data of ammonia water and flue gas in the reactor, dynamically adjust the basic ammonia injection amount based on the reaction data to obtain the final ammonia injection amount, and adjust the ammonia injection amount of the ammonia injection pipeline to the final ammonia injection amount.

[0044] In the denitrification process, in addition to the ammonia concentration, other factors also affect the final denitrification effect. Therefore, it is necessary to obtain all reaction data that may affect the denitrification effect and generate the final ammonia injection amount based on the reaction data so that the ammonia can fully react with the nitrogen oxides in the flue gas.

[0045] This embodiment adopts a precise ammonia injection control system that combines multi-parameter collaborative sensing and intelligent regulation. By integrating multi-dimensional influencing factors such as flue gas conditions, reaction status, and equipment parameters, a dynamic ammonia injection calculation model is established. Combined with real-time closed-loop feedback regulation and operating condition adaptive correction strategies, the precise and efficient control of ammonia injection in the SCR ammonia denitrification system is achieved.

[0046] In one embodiment, the step of calculating the theoretical ammonia-nitrogen molar ratio based on the inlet flue gas flow rate and the inlet nitrogen oxide concentration includes: Obtain the outlet flue gas flow rate and the outlet nitrogen oxide concentration threshold of the flue gas outlet duct; A theoretical molar ratio calculation function for ammonia nitrogen is constructed based on the inlet flue gas flow rate, the inlet nitrogen oxide concentration, the outlet flue gas flow rate, and the outlet nitrogen oxide concentration threshold.

[0047] In an optional implementation, the theoretical molar ratio of ammonia to nitrogen is calculated as follows: Theoretical ammonia-nitrogen molar ratio = (inlet nitrogen oxide concentration × inlet flue gas flow rate) / (inlet nitrogen oxide concentration × inlet flue gas flow rate - outlet nitrogen oxide concentration threshold × outlet flue gas flow rate).

[0048] This embodiment collects relevant data from the flue gas inlet and outlet ducts in real time to calculate the accurate theoretical ammonia-nitrogen molar ratio, providing a data basis for subsequent ammonia concentration calculations.

[0049] In one embodiment, the step of calculating the basic ammonia injection amount based on the theoretical ammonia-nitrogen molar ratio and the ammonia concentration correction factor includes a calculation function for the basic ammonia injection amount comprising: Basic ammonia injection rate = theoretical ammonia-nitrogen molar ratio × inlet nitrogen oxide concentration × inlet flue gas flow rate × ammonia water concentration correction factor.

[0050] The ammonia concentration correction factor is mainly affected by factors such as the concentration of ammonia itself, temperature, impurity content in the ammonia, and pressure. Therefore, the ammonia concentration correction factor can be set according to the actual situation of these factors.

[0051] In one embodiment, the step of acquiring reaction data of ammonia water and flue gas in the reactor includes: The catalyst operating time and reactor bed temperature of ammonia water and flue gas are obtained, and a catalyst activity correction coefficient is generated based on the catalyst operating time and reactor bed temperature. The flue gas temperature and the optimal reaction temperature of the catalyst in the reactor are obtained, and a flue gas temperature correction coefficient is generated based on the flue gas temperature and the optimal reaction temperature of the catalyst. Obtain the oxygen content of the inlet flue gas in the flue gas inlet duct, and generate an oxygen content correction coefficient based on the oxygen content of the inlet flue gas.

[0052] The more severe the catalyst activity decay, the larger the value of the catalyst activity correction coefficient; the higher the oxygen content in the flue gas, the larger the oxygen content correction coefficient, in order to compensate for the influence of oxygen on the reaction.

[0053] In one embodiment, the step of dynamically adjusting the basic ammonia injection rate based on the reaction data to obtain the final ammonia injection rate includes: The final ammonia injection rate calculation function is generated based on the catalyst activity correction coefficient, the flue gas temperature correction coefficient, and the oxygen content correction coefficient: The final ammonia injection rate calculation function is: base ammonia injection rate × catalyst activity correction factor × flue gas temperature correction factor × oxygen content correction factor.

[0054] This embodiment considers the respective influencing factors and constructs corresponding correction coefficients to dynamically correct the ammonia injection quantity, thus solving the defect of poor adaptability to operating conditions in the existing technology.

[0055] In one embodiment, after the step of adjusting the ammonia injection rate of the ammonia injection pipeline to the final ammonia injection rate, the method further includes: Obtain the nitrogen oxide concentration and ammonia escape rate at the outlet of the flue gas duct; If the outlet nitrogen oxide concentration is greater than the outlet nitrogen oxide concentration threshold, the ammonia injection rate is increased by the first preset step size. If the outlet nitrogen oxide concentration is less than the outlet nitrogen oxide concentration threshold and the ammonia escape amount is greater than the ammonia escape amount threshold, then the amount of ammonia injected in loss is reduced according to the second preset step size.

[0056] The ammonia slip threshold can be set to 1.5 ppm-2 ppm. If both the outlet nitrogen oxide concentration and ammonia slip meet the requirements, the current ammonia injection rate will be maintained. Simultaneously, an ammonia slip warning threshold (1.5 ppm) is set. When the ammonia slip approaches the warning threshold, the ammonia injection rate will be reduced first to avoid exceeding the limit. The closed-loop adjustment cycle is set to 2-5 seconds to ensure timely adjustment.

[0057] Based on the fluctuation range of the inlet flue gas flow, the operating conditions are divided into three zones: low load (flow ≤ 50% of rated flow), rated load (flow 50%~100% of rated flow), and high load (flow > 100% of rated flow). Different initial values ​​for correction coefficients and adjustment step sizes are preset for each zone. Under low load conditions, a smaller adjustment step size is used to avoid excessive fluctuations in ammonia injection. Under high load conditions, the weights of Kactivity and Koxygen are appropriately increased to improve reaction efficiency. Under rated load conditions, the correction coefficients are kept balanced to ensure control accuracy. The system can automatically identify the operating zone and switch the corresponding control parameters based on the real-time flue gas flow.

[0058] This embodiment is applied to the SCR ammonia denitrification system of a 300MW coal-fired power plant. The outlet NOx concentration limit is 50mg / m³, the maximum allowable ammonia slip is 2ppm, the optimal reaction temperature range of the catalyst is 300~400℃, and the ammonia concentration is 20%. The specific control steps are as follows: (1) Multi-parameter acquisition: Real-time acquisition of parameters through sensors: inlet flue gas flow rate 300,000 m³ / h (rated load, corresponding to 50%~100% range), inlet NOx concentration 300 mg / m³, inlet flue gas temperature 350℃, inlet oxygen content 6%; catalyst running time 12,000 h, bed temperature 355℃; ammonia water supply pressure 0.4 MPa; real-time detection of outlet NOx concentration and outlet ammonia slip.

[0059] (2) Calculation of dynamic ammonia injection rate: ① Calculation of basic ammonia injection rate: NSR theoretical = (300×300000) / (300×300000 - 50×300000) = 1.2; Q basic = 1.2×300×300000×0.85 (K concentration = 0.85) = 91800kg / h; ② Calculation of correction coefficient: K activity is fitted to 1.05 based on the running time of 12000h; K temperature is taken as 1.0 because 350℃ is in the optimal range; K oxygen is taken as 1.02 based on the oxygen content of 6%; ③ Final ammonia injection rate Q final = 91800×1.05×1.0×1.02 = 98050.2kg / h.

[0060] (3) Ammonia injection execution and closed-loop regulation: The ammonia injection system adjusts the opening of the ammonia injection valve according to the final instruction of Q to maintain the stability of the ammonia injection volume; the closed-loop regulation cycle is set to 3s, and the NOx concentration at the outlet is detected in real time as 48mg / m³ and the ammonia escape volume is 1.2ppm, both of which meet the requirements and maintain the current ammonia injection volume.

[0061] (4) Verification of operating conditions switching: When the boiler load drops to low load, the inlet flue gas flow rate drops to 120000m³ / h, and the inlet NOx concentration drops to 180mg / m³, the system automatically identifies the low load condition and the adjustment step size is reduced from 0.5kg / h to 0.2kg / h; Q is recalculated as 1.2×180×120000×0.85×1.05×1.0×1.02 = 47064.96kg / h; after closed-loop adjustment, the outlet NOx concentration is 49mg / m³, and the ammonia slip is 1.1ppm, which is stable and meets the standard.

[0062] (5) Finished product inspection: The system ran continuously for 72 hours. The monitoring results showed that the NOx concentration at the outlet was stable at 45~49 mg / m³, the denitrification efficiency was 95.3%~96.7%, the ammonia slip was stable at 1.0~1.3 ppm, and the ammonia water consumption was reduced by 10.5% compared with the existing process.

[0063] To perform the corresponding steps in the above embodiments and various possible methods, an implementation method of a multi-parameter coordinated SCR ammonia injection control device is given below. Please refer to [link / reference needed]. Figure 4 , Figure 4 This is a functional block diagram of a multi-parameter coordinated SCR ammonia injection control device provided in this embodiment of the invention. It should be noted that the basic principle and technical effects of the multi-parameter coordinated SCR ammonia injection control device provided in this embodiment are the same as those in the above embodiments. For the sake of brevity, any parts not mentioned in this embodiment can be referred to the corresponding content in the above embodiments. The multi-parameter coordinated SCR ammonia injection control device 400 includes: Data acquisition module 410 is used to acquire the inlet flue gas flow rate and inlet nitrogen oxide concentration of the flue gas inlet duct, and calculate the theoretical ammonia-nitrogen molar ratio based on the inlet flue gas flow rate and inlet nitrogen oxide concentration; Data calculation module 420 is used to calculate the basic ammonia injection amount based on the theoretical ammonia-nitrogen molar ratio and ammonia water concentration correction coefficient; The dynamic adjustment module 430 is used to acquire reaction data of ammonia water and flue gas in the reactor, dynamically adjust the basic ammonia injection amount based on the reaction data to obtain the final ammonia injection amount, and adjust the ammonia injection amount of the ammonia injection pipeline to the final ammonia injection amount.

[0064] Optionally, the above modules can be stored in the form of software or firmware. Figure 1 The memory shown is either stored in or embedded in the operating system (OS) of the multi-parameter collaborative SCR ammonia injection control device, and can be controlled by... Figure 1 The processor executes the commands. Meanwhile, the data and program code required to execute these modules can be stored in memory.

[0065] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative; for example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0066] In addition, the functional modules in the various embodiments of the present invention can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0067] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a portion 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 described in the various embodiments of this invention. 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.

[0068] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-parameter coordinated SCR ammonia injection control method, characterized in that, An application is made in denitrification equipment, the denitrification equipment including a reactor, a flue gas inlet duct, a flue gas outlet duct, and an ammonia injection pipeline. One end of the reactor is mechanically connected to the flue gas inlet duct, and the other end of the reactor is mechanically connected to the flue gas outlet duct. The ammonia injection pipeline is disposed within the flue gas inlet duct, which is used to transport flue gas to the reactor. The ammonia injection pipeline is used to inject ammonia water into the flue gas inlet duct. The reactor is used for the reaction between the ammonia water and the flue gas. The method includes: Obtain the inlet flue gas flow rate and inlet nitrogen oxide concentration of the flue gas inlet duct, and calculate the theoretical ammonia-nitrogen molar ratio based on the inlet flue gas flow rate and inlet nitrogen oxide concentration; The basic ammonia injection rate is calculated based on the theoretical ammonia-nitrogen molar ratio and the ammonia concentration correction factor. The reaction data of ammonia water and flue gas in the reactor are obtained, and the basic ammonia injection rate is dynamically adjusted based on the reaction data to obtain the final ammonia injection rate. The ammonia injection rate of the ammonia injection pipeline is then adjusted to the final ammonia injection rate.

2. The multi-parameter coordinated SCR ammonia injection control method according to claim 1, characterized in that, The step of calculating the theoretical ammonia-nitrogen molar ratio based on the inlet flue gas flow rate and the inlet nitrogen oxide concentration includes: Obtain the outlet flue gas flow rate and the outlet nitrogen oxide concentration threshold of the flue gas outlet duct; A theoretical molar ratio calculation function for ammonia nitrogen is constructed based on the inlet flue gas flow rate, the inlet nitrogen oxide concentration, the outlet flue gas flow rate, and the outlet nitrogen oxide concentration threshold.

3. The multi-parameter coordinated SCR ammonia injection control method according to claim 2, characterized in that, The theoretical molar ratio of ammonia to nitrogen is calculated using the following function: Theoretical ammonia-nitrogen molar ratio = (inlet nitrogen oxide concentration × inlet flue gas flow rate) / (inlet nitrogen oxide concentration × inlet flue gas flow rate - outlet nitrogen oxide concentration threshold × outlet flue gas flow rate).

4. The multi-parameter coordinated SCR ammonia injection control method according to claim 1, characterized in that, The step of calculating the basic ammonia injection rate based on the theoretical ammonia-nitrogen molar ratio and the ammonia concentration correction factor includes the following calculation function for the basic ammonia injection rate: Basic ammonia injection rate = theoretical ammonia-nitrogen molar ratio × inlet nitrogen oxide concentration × inlet flue gas flow rate × ammonia water concentration correction factor.

5. The multi-parameter coordinated SCR ammonia injection control method according to claim 1, characterized in that, The step of obtaining reaction data of ammonia water and flue gas in the reactor includes: The catalyst operating time and reactor bed temperature of ammonia water and flue gas are obtained, and a catalyst activity correction coefficient is generated based on the catalyst operating time and reactor bed temperature. The flue gas temperature and the optimal reaction temperature of the catalyst in the reactor are obtained, and a flue gas temperature correction coefficient is generated based on the flue gas temperature and the optimal reaction temperature of the catalyst. Obtain the oxygen content of the inlet flue gas in the flue gas inlet duct, and generate an oxygen content correction coefficient based on the oxygen content of the inlet flue gas.

6. The multi-parameter coordinated SCR ammonia injection control method according to claim 5, characterized in that, The step of dynamically adjusting the basic ammonia injection rate based on the reaction data to obtain the final ammonia injection rate includes: The final ammonia injection rate calculation function is generated based on the catalyst activity correction coefficient, the flue gas temperature correction coefficient, and the oxygen content correction coefficient: The final ammonia injection rate calculation function is: base ammonia injection rate × catalyst activity correction factor × flue gas temperature correction factor × oxygen content correction factor.

7. The multi-parameter coordinated SCR ammonia injection control method according to claim 1, characterized in that, After the step of adjusting the ammonia injection rate of the ammonia injection pipeline to the final ammonia injection rate, the method further includes: Obtain the nitrogen oxide concentration and ammonia escape rate at the outlet of the flue gas duct; If the outlet nitrogen oxide concentration is greater than the outlet nitrogen oxide concentration threshold, the ammonia injection rate is increased by the first preset step size. If the outlet nitrogen oxide concentration is less than the outlet nitrogen oxide concentration threshold and the ammonia escape amount is greater than the ammonia escape amount threshold, then the amount of ammonia injected in loss is reduced according to the second preset step size.

8. A multi-parameter coordinated SCR ammonia injection control device, characterized in that, include: The data acquisition module is used to acquire the inlet flue gas flow rate and inlet nitrogen oxide concentration of the flue gas inlet duct, and to calculate the theoretical ammonia-nitrogen molar ratio based on the inlet flue gas flow rate and inlet nitrogen oxide concentration; The data calculation module is used to calculate the basic ammonia injection amount based on the theoretical ammonia-nitrogen molar ratio and the ammonia concentration correction coefficient. The dynamic adjustment module is used to acquire reaction data of ammonia water and flue gas in the reactor, dynamically adjust the basic ammonia injection rate based on the reaction data to obtain the final ammonia injection rate, and adjust the ammonia injection rate of the ammonia injection pipeline to the final ammonia injection rate.

9. An electronic device, characterized in that, It includes a processor and a memory, the memory storing machine-executable instructions that can be executed by the processor, the processor executing the machine-executable instructions to implement the multi-parameter coordinated SCR ammonia injection control method according to any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the multi-parameter coordinated SCR ammonia injection control method as described in any one of claims 1-7.

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