Biomass boiler denitrification method, system and equipment based on flue gas temperature

Abstract

The present application provides a biomass boiler denitrification method, system and equipment based on flue gas temperature, which relates to the field of flue gas purification technology. The method includes: dividing the flue gas duct into sections to determine an annular reaction window; introducing a gradient injection mode to deploy an injection reactor, and deploying a cascade reaction zone in the flue gas duct; for the upstream reaction node, according to the annular reaction window, executing a coarse adjustment cascade decision based on a wide temperature range, responding to the injection equipment to perform the first stage of denitrification treatment, and performing fine adjustment cascade fine-tuning in a narrow temperature range by tracking the thermal zone migration from the upstream reaction node to the downstream reaction node, and responding to the injection equipment to perform the second stage of denitrification treatment and export management. This application solves the technical problem in the prior art that the denitrification efficiency is low due to the uneven temperature of the biomass boiler and the complex and changeable flue gas composition, which is difficult to accurately control. The denitrification efficiency is improved by introducing a gradient injection mode and graded denitrification control.

Description

Technical Field

[0001] The present application relates to the field of flue gas purification technology, and in particular to a method, system and equipment for denitrification of a biomass boiler based on flue gas temperature. Background Art

[0002] In practical applications, biomass boilers often face the problem of excessively high nitrogen oxide (NOx) emissions due to the instability of their fuel composition and variability in furnace temperature. Currently, the two most commonly used denitrification technologies are selective non-catalytic reduction (SNCR) and selective catalytic reduction (SCR). SNCR technology does not require a catalyst. Instead, it injects a reducing agent into the flue gas, causing a high-temperature reduction reaction between the reducing agent and NOx, thereby reducing NOx emissions. However, the reaction temperature required for SNCR is typically between 800°C and 1200°C, while the furnace temperature of biomass boilers is mostly around 650°C. This temperature effect results in low denitrification rates in biomass boilers, failing to meet ultra-low emission requirements. SCR technology uses a denitrification catalyst to react NOx in the flue gas with the reducing agent, producing harmless nitrogen and water vapor. While SCR technology offers high denitrification efficiency, the alkali metals in the flue gas of biomass boilers can easily poison the catalyst, resulting in high costs. Due to the diversity of fuel composition and uneven furnace temperature distribution, biomass boilers experience large fluctuating flue gas temperatures, and the flue gas composition has a strong time-varying nature, making it difficult for traditional denitrification technology to achieve precise control in different temperature zones. This leads to low denitrification efficiency and an inability to meet increasingly stringent ultra-low emission standards.

[0003] In summary, the existing technology has technical problems such as low denitrification efficiency due to uneven temperature of biomass boilers and complex and changeable flue gas components, which make it difficult to accurately control. Summary of the Invention

[0004] The purpose of this application is to provide a biomass boiler denitrification method, system and equipment based on flue gas temperature, so as to solve the technical problem in the prior art that the denitrification efficiency is low due to uneven temperature of the biomass boiler, complex and changeable flue gas composition, and difficulty in precise control.

[0005] In view of the above problems, the present application provides a biomass boiler denitrification method, system and equipment based on flue gas temperature.

[0006] In the first aspect, the present application provides a biomass boiler denitrification method based on flue gas temperature, which is implemented by a biomass boiler denitrification system based on flue gas temperature, wherein the biomass boiler denitrification method based on flue gas temperature includes: dividing the flue gas duct into sections based on the central area to the edge area, and determining an annular reaction window, wherein the annular reaction window is dynamically updated based on the temperature variable; introducing a gradient injection mode to deploy a jet reactor, and deploying a cascade reaction zone in the flue gas duct, wherein the gradient injection mode uses first-order window matching and second-order window transition as a mode mechanism; for the upstream reaction node in the cascade reaction zone, according to the annular reaction window, triggering the jet reactor to execute a coarse adjustment cascade decision based on a wide temperature range, and responding to the injection equipment to perform the first stage of denitrification treatment, and triggering the jet reactor to execute a fine adjustment cascade fine adjustment in a narrow temperature range by tracking the hot zone migration from the upstream reaction node to the downstream reaction node, and responding to the injection equipment to perform the second stage of denitrification treatment and export management.

[0007] Optionally, multi-level temperature values ​​are divided, wherein the multi-level temperature values ​​include a first division standard based on a wide temperature range and a second division standard based on a narrow temperature range; as the flue gas enters the pipeline, thermal imaging temperature measurement is triggered to determine a cross-sectional temperature map; with the cross-sectional temperature map, an annular window division of the multi-level temperature values ​​based on the first division standard is performed to determine the annular reaction window.

[0008] Optionally, according to the gradient injection mode, based on NO X The linear relationship between temperature and injection amount determined based on the reaction completeness of concentration constraint is used as a benchmark, and the two-order gradient scale decision-injection parameter control is converted into a decision target to supervise the training of the injection reactor; and a communication connection between the injection reactor and the injection equipment deployed in the cascade reaction zone is established.

[0009] Optionally, the cascade reaction zone includes at least two reaction nodes; and selective denitrification triggering of the cascade reaction zone is performed according to the reaction completeness.

[0010] Optionally, the flue gas initial NO X concentration, determine the first reaction completeness, where the reaction completeness is related to NO X concentration is negatively correlated; based on the first reaction completeness, a first linear relationship is determined, wherein the temperature is negatively correlated with the injection amount, and the slope of the first linear relationship is positively correlated with the first reaction completeness; based on the first linear relationship, a coarse adjustment cascade outer loop is deployed.

[0011] Optionally, according to the first linear relationship, the annular reaction window is matched with the window temperature domain to determine the window injection amount, wherein the window injection amount corresponds one-to-one to the annular reaction window; according to the window injection amount, a step injection amount transition processing is performed on the boundary of the neighborhood window to determine the gradient injection amount; based on the gradient injection amount, a coarse adjustment cascade inner loop is constructed; the coarse adjustment cascade outer loop and the coarse adjustment cascade inner loop are cascaded to determine the first gradient strategy of the two-order gradient scale decision.

[0012] Optionally, a parameter-control conversion relationship of the injection component is determined, wherein the parameter-control conversion relationship is a conversion relationship between control requirements and control parameters; according to the parameter-control conversion relationship, the first gradient strategy is converted, and according to the communication connection, the injection equipment of the upstream reaction node is controlled, wherein the injection equipment retrieves the denitrification reactant from the storage area.

[0013] Optionally, for the annular reaction window, by tracking the migration of the hot zone, the window is adjusted according to the multi-level temperature value of the second division standard to determine the adjusted reaction window; X Concentration detection determines the second reaction completeness; based on the second reaction completeness and the adjusted reaction window, a two-order gradient scale decision-injection parameter control conversion is performed, and the injection equipment of the downstream reaction node is controlled according to the communication connection.

[0014] In the second aspect, the present application also provides a biomass boiler denitrification system based on flue gas temperature, which is used to execute the biomass boiler denitrification method based on flue gas temperature as described in the first aspect, wherein the biomass boiler denitrification system based on flue gas temperature includes: a cross-section division module, which is used to perform cross-section division from the central area to the edge area for the flue gas duct, and determine the annular reaction window, wherein the annular reaction window is dynamically updated based on the temperature variable; a reactor deployment module, which is used to introduce a gradient injection mode to deploy the injection reactor, and deploy a cascade reaction zone in the flue gas duct, wherein the gradient injection mode uses first-order window matching and second-order window transition as the mode mechanism; a denitrification processing module, which is used to trigger the injection reactor to execute a coarse adjustment cascade decision based on a wide temperature range for the upstream reaction node in the cascade reaction zone according to the annular reaction window, and respond to the injection equipment to perform the first stage of denitrification processing, and trigger the injection reactor to perform fine adjustment cascade fine adjustment in a narrow temperature range by tracking the hot zone migration from the upstream reaction node to the downstream reaction node, and respond to the injection equipment to perform the second stage of denitrification processing and export management.

[0015] In a third aspect, the present application also provides an electronic device comprising: at least one processor; a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the steps of the biomass boiler denitrification method based on flue gas temperature as described in any one of the above-mentioned first aspects.

[0016] One or more technical solutions provided in this application have at least the following beneficial effects:

[0017] The flue gas duct is divided into sections from the central area to the edge area to determine the annular reaction window, wherein the annular reaction window is dynamically updated based on the temperature variable; a gradient injection mode is introduced to deploy the injection reactor, and a cascade reaction zone is deployed in the flue gas duct, wherein the gradient injection mode uses first-order window matching and second-order window transition as the mode mechanism; for the upstream reaction node in the cascade reaction zone, according to the annular reaction window, the injection reactor is triggered to execute a coarse adjustment cascade decision based on a wide temperature range, and responds to the injection equipment to perform the first stage of denitrification treatment, and by tracking the hot zone migration from the upstream reaction node to the downstream reaction node, the injection reactor is triggered to execute a fine adjustment cascade fine-tuning in a narrow temperature range, and responds to the injection equipment to perform the second stage of denitrification treatment and export management. In other words, the pipeline cross-section is divided into dynamic reaction windows based on the flue gas temperature to achieve regional precise processing; a gradient injection mode is introduced, and a gradient strategy is constructed according to the temperature-injection volume relationship to optimize the denitrification agent injection and improve the reaction efficiency; graded denitrification control is adopted, and the upstream wide temperature range coarse adjustment quickly reduces the nitrogen oxide concentration, and the downstream narrow temperature range fine adjustment is further optimized, combined with flexible adjustment of hot zone tracking to ensure that the denitrification efficiency in different temperature ranges is optimized and the denitrification efficiency is comprehensively improved.

[0018] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, which can be implemented in accordance with the contents of the description, and to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are specifically listed below. It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become easy to understand through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in this application or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0020] Figure 1 This is a flow chart of the biomass boiler denitrification method based on flue gas temperature in this application.

[0021] Figure 2 This is a schematic diagram of the structure of the biomass boiler denitrification system based on flue gas temperature in this application.

[0022] Figure 3 This is a schematic diagram of the structure of an exemplary electronic device of this application.

[0023] Explanation of the reference numerals: cross-section division module 11 , reactor deployment module 12 , denitrification treatment module 13 , bus 300 , receiver 301 , processor 302 , transmitter 303 , memory 304 , bus interface 305 . DETAILED DESCRIPTION

[0024] This application solves the technical problem of low denitrification efficiency in the prior art by providing a biomass boiler denitrification method, system and equipment based on flue gas temperature, which is caused by uneven temperature of biomass boilers, complex and changeable flue gas components, and difficulty in precise control. Based on the flue gas temperature, the pipeline cross section is divided into dynamic reaction windows to achieve regional precision processing; a gradient injection mode is introduced, and a gradient strategy is constructed based on the temperature-injection volume relationship to optimize the injection of denitrification agents and improve reaction efficiency; graded denitrification control is adopted, and the upstream wide temperature range is coarsely adjusted to quickly reduce the concentration of nitrogen oxides, and the downstream narrow temperature range is finely adjusted for further optimization. Combined with flexible adjustment of hot zone tracking, it ensures that the denitrification efficiency in different temperature ranges is optimized, and the denitrification efficiency is comprehensively improved.

[0025] Below, the technical solutions in this application will be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of this application, rather than all the embodiments of this application. It should be understood that this application is not limited to the example embodiments described herein. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. It should also be noted that, for the convenience of description, only the parts related to this application, rather than all of them, are shown in the accompanying drawings.

[0026] For example, see the attached Figure 1 The present application provides a biomass boiler denitrification method based on flue gas temperature, wherein the biomass boiler denitrification method based on flue gas temperature is performed by a biomass boiler denitrification system based on flue gas temperature, and the biomass boiler denitrification method based on flue gas temperature specifically includes the following steps:

[0027] S100: Divide the flue gas duct into sections from a central area to an edge area to determine an annular reaction window, wherein the temperature variable is used as a basis for division and the annular reaction window is dynamically updated.

[0028] Furthermore, the present application S100 includes:

[0029] Divide the temperature values ​​into multiple levels, wherein the multiple levels of temperature values ​​include a first division standard based on a wide temperature range and a second division standard based on a narrow temperature range; as the flue gas enters the pipeline, thermal imaging temperature measurement is triggered to determine a cross-sectional temperature map; with the cross-sectional temperature map, perform an annular window division of the multiple levels of temperature values ​​based on the first division standard to determine the annular reaction window.

[0030] Specifically, the flue gas duct is divided into a central area and an edge area based on its geometric structure and flow characteristics. The central area of ​​the flue gas duct is usually an area with relatively uniform airflow velocity and temperature, while the edge area may experience large variations in temperature and airflow velocity due to flow instability or wall effects. Based on the temperature changes in the flue gas duct, the temperature variable is used as the basis for division and the annular reaction window is dynamically adjusted. This means that as the flue gas flows, the temperature will continue to change, and the division of the reaction window will also be adjusted accordingly to ensure that the denitrification reaction can proceed efficiently in different temperature zones.

[0031] Dividing the flue gas temperature into multiple temperature ranges, each corresponding to different temperature characteristics, helps refine the control of temperature zones. A wide temperature range refers to an area with a large temperature variation range, while a narrow temperature range refers to an area with a smaller temperature variation range. In the denitrification process, a wide temperature range is generally used for coarse adjustments, while a narrow temperature range is used for fine adjustments. Based on the overall distribution of flue gas temperature, a relatively wide temperature range is determined, which is the first division standard. For certain areas with smaller temperature variations, the narrow temperature range division standard is used to determine the second division standard.

[0032] Infrared imaging technology is used to monitor the distribution and changes in flue gas temperature in real time within the flue gas duct, creating a cross-sectional temperature map. This temperature map represents the temperature distribution across each section of the flue gas duct (from the center to the edges), helping to identify temperature characteristics at different locations. As the flue gas flows, the temperature changes, and the reaction window is adjusted based on the new temperature data, dynamically updating the annular reaction window.

[0033] Based on the determined cross-sectional temperature profile, the temperature range within the cross section is divided into several large intervals according to the first division criterion. For example, if the temperature range within the flue gas duct is 600°C to 800°C, the temperature intervals can be divided into 600°C-650°C, 650°C-700°C, 700°C-750°C, 750°C-800°C, and so on, based on the amplitude of temperature fluctuations. Each temperature interval corresponds to an annular reaction window. The annular reaction window is determined based on the divided temperature intervals. The annular reaction window is typically distributed along the cross section of the flue gas duct, forming a ring-shaped structure. Each annular region corresponds to a specific temperature range, within which the denitrification reaction can be optimized based on temperature conditions. A comparison of denitrification efficiencies with and without annular window division revealed that the denitrification efficiency was 65% and the NOx emission concentration was 120 mg / m³ without the annular window division. However, with the annular window division, the denitrification efficiency increased to 85% and the NOx emission concentration decreased to 50 mg / m³, significantly improving the denitrification effect.

[0034] Because flue gas temperature varies with flow, the annular reaction window divisions should be dynamically updated based on real-time temperature maps. When the temperature changes, the annular reaction window is re-divided, and the jet reactor's operating mode is adjusted accordingly to accommodate the new temperature conditions. Using thermal imaging technology to obtain real-time temperature distribution in the flue gas duct, we can accurately determine the temperature characteristics of different areas and dynamically adjust the reaction window. Accurate temperature divisions and dynamic updating of the reaction window improve denitrification efficiency and significantly reduce nitrogen oxide emissions.

[0035] S200: Introducing a gradient injection mode to deploy a jet reactor and deploying a cascade reaction zone in a flue gas duct, wherein the gradient injection mode uses first-order window matching and second-order window transition as a mode mechanism.

[0036] Furthermore, the present application S200 includes:

[0037] According to the gradient injection mode, based on NO X The linear relationship between temperature and injection amount determined based on the reaction completeness of concentration constraint is used as a benchmark, and the two-order gradient scale decision-injection parameter control is converted into a decision target to supervise the training of the injection reactor; and a communication connection between the injection reactor and the injection equipment deployed in the cascade reaction zone is established.

[0038] Furthermore, the present application further comprises the following steps:

[0039] The cascade reaction zone includes at least two reaction nodes; selective denitration triggering of the cascade reaction zone is performed according to the reaction completeness.

[0040] Specifically, a gradient injection mode was introduced. This mode adjusts the injection dosage based on temperature gradients or changes in the reaction zone. In this mode, the injection dosage is adjusted gradually, either increasing or decreasing, rather than making a large all-at-once adjustment. This tiered management of temperature and concentration ensures the jet reactor can respond precisely to varying conditions, optimizing denitrification performance. First-order window matching involves roughly adjusting the injection dosage over a wide temperature range to meet reaction requirements. This rough adjustment of the injection dosage is performed within a relatively large temperature range, thus requiring relatively low precision. Second-order window transition, on the other hand, involves more refined adjustments within a narrow temperature range, further optimizing the performance of the first stage. For example, in first-order window matching (wide temperature range), due to large temperature fluctuations, the jet reactor makes large injection adjustments within this temperature range. For every 20°C temperature change, the injection dosage increases by 15%. During this stage, the NOx concentration decreases from 400 mg / m³ to 150 mg / m³. In second-order window transition (narrow temperature range), the temperature changes are smaller, allowing the jet reactor to make finer adjustments. For every 5°C change in temperature, the injection volume increased by 2%, and the nitrogen oxide concentration further decreased from 150mg / m³ to 5mg / m³.

[0041] In practical applications, the main goal of denitrification is to reduce NO in flue gas. X concentration, so NO X Concentration is the main constraint of denitrification reaction. X The reactor can gradually achieve the denitrification target by adjusting the injection dosage according to the target concentration. The completeness of the reaction is an important indicator to measure the reaction effect, usually expressed as NO X If the injection amount and reaction conditions are appropriate, the reaction completeness should be close to 100%, that is, NO X The concentration is reduced to the lowest level. X Concentration constraint means that during the denitrification process, the adjustment target of the injection reactor is to ensure that the NO X The concentration is reduced to a predetermined safe range as a measure of the reaction effect. By adjusting the injection volume, the denitrification reaction is ensured to be complete and the denitrification target is achieved. The completeness of the reaction refers to the degree of completion of the denitrification reaction under specific conditions. The higher the completeness of the reaction, the better the denitrification reaction efficiency. X The concentration is reduced more thoroughly.

[0042] There is a linear relationship between temperature and injection amount, which shows how temperature changes directly affect the injection amount of the injection reactor. As the flue gas temperature fluctuates, the injection amount of the injection reactor needs to be dynamically adjusted according to this linear relationship. XThe change in concentration may be gradual. A two-step gradient scale decision is adopted, that is, different injection adjustment strategies are adopted in different temperature zones. When the flue gas temperature changes greatly, a larger injection dosage adjustment is adopted. For example, in the first-step gradient (wide temperature range coarse adjustment), when the temperature changes by more than 20°C, the injection amount may be adjusted every 5% change. In the second-step gradient (narrow temperature range fine adjustment), that is, when the temperature changes are small and tends to be stable, a more precise injection dosage adjustment is adopted. When the temperature changes by less than 5°C each time, the injection amount is adjusted by 1%-2% each time. The injection parameter control conversion is based on the real-time NO X The system automatically selects the appropriate adjustment mode (coarse or fine adjustment) based on the concentration and temperature data to ensure that the jet reactor is always in the best working condition.

[0043] Obtain information about flue gas temperature, NO from historical denitrification records X The historical data of concentration, injection volume, etc. are used as the input and target output of the training. For different flue gas temperatures, the appropriate injection volume is selected to achieve the best NO X Removal effect. Generally, when the temperature is high, NO X The removal efficiency is high, so the injection volume can be reduced appropriately. X The relationship between the flue gas temperature and NO concentration is established to build a linear relationship between temperature and injection amount. The whole reaction process is divided into two stages, namely, coarse adjustment in a wide temperature range and fine adjustment in a narrow temperature range. The decision of the two-step gradient is based on the flue gas temperature and NO X Real-time feedback of concentration automatically determines the injection amount at each stage. Model training is performed using regression analysis or neural network algorithms. X The model was trained to determine the relationship between the injection volume and NO concentration in a wide temperature range. X The goal of the model is to convert NO X The concentration quickly decreases to a lower range. Using a more refined data set, the injection volume and NO X During training, the goal is to minimize the error function, typically calculated as mean squared error. Through training, the model parameters are optimized until the error is minimized.

[0044] Cross-validation is used to evaluate model performance. The data is divided into multiple subsets, and the model is trained on each subset. The average performance of the model is then evaluated. R² (coefficient of determination) is used to assess how well the model fits the data. Values ​​closer to 1 indicate a more accurate model. Parameters used in the training process, such as the learning rate and batch size, are adjusted. The model is fine-tuned to ensure that the jet reactor can accurately control NO emissions during actual operation. X During the actual operation of the jet reactor, the flue gas temperature, NO Xconcentration and injection volume, adjust the operation of the injection reactor to ensure that the optimal NO X Removal efficiency.

[0045] A jet reactor is a reactor that injects reducing agents (such as ammonia, urea solution, etc.) into the flue gas during the denitrification process to react with nitrogen oxides and reduce nitrogen oxide emissions. A cascade reaction zone is a system in which the flue gas pipeline is divided into multiple reaction zones. Each zone is optimized for different reaction conditions and includes at least two reaction nodes (such as an upstream reaction node and a downstream reaction node). Each node performs a different denitrification function. The upstream reaction node is when the flue gas first enters the reaction zone. The temperature is usually higher, and this can be used to make rough adjustments to quickly reduce NO. X The downstream reaction node refers to the point where the flue gas enters the downstream, where the temperature is usually lower. At this time, fine adjustments can be made to further reduce NO X concentration.

[0046] The completeness of reaction is one of the most important evaluation indicators in the whole denitrification process, which determines whether each reaction node needs to continue working, that is, the denitrification efficiency in the reaction process, usually expressed as NO X The higher the reaction completeness, the higher the removal rate of NO X The better the removal effect, the better the reaction completeness. The evaluation of the reaction completeness usually depends on the NO X concentration, flue gas temperature, injection volume, etc., by real-time monitoring of NO in flue gas X The concentration changes are monitored and the denitrification process of the reaction node is dynamically adjusted based on data feedback.

[0047] NO in flue gas X Real-time monitoring of concentrations to evaluate the completeness of the reaction at each node. When the completeness of the reaction after executing a node reaches the target, it means that the node has reached the set NO X The selective denitrification trigger mechanism determines whether to start the denitrification process of a certain reaction node based on the evaluation result of the reaction completeness. When the reaction completeness is lower than the set standard (i.e. NO X concentration fails to be effectively reduced), it will continue to trigger the denitrification reaction at other nodes to further reduce NO X concentration.

[0048] Establish a communication connection between the jet reactor and the jet equipment deployed in the cascade reaction zone, transmit reaction data and control information in real time, so that the jet reactor can be dynamically adjusted according to the actual flue gas conditions. The jet reactor and the jet equipment in the cascade reaction zone need to use standard communication protocols for data exchange. The data exchanged in the communication mainly include: flue gas temperature, NOX concentration, injection volume, reaction process status, etc. Install temperature sensors, NO X Sensors and flow sensors are used to monitor the flue gas status in real time. The data monitored by the sensors are transmitted to the injection reactor, which can X According to the change of concentration, the injection amount of the injection equipment is adjusted in real time.

[0049] Each reaction node in the cascade reaction zone will decide whether to continue to start the denitrification reaction based on the evaluation results of the reaction completeness. X The concentration is high and needs to be roughly adjusted through the injection reactor. X The change in concentration evaluates the denitrification effect (i.e., the completeness of the reaction). If the standard has been met, the remaining nodes will not be triggered and only the pipeline will be diverted. Through the gradient injection mode, coarse and fine adjustments can be made in different temperature ranges to optimize the denitrification effect and maximize the reduction of NO X The concentration-selective denitrification trigger mechanism ensures that denitrification reaction occurs only when needed, avoiding excessive treatment of unnecessary reaction nodes and saving the use of injection agents.

[0050] S300: For the upstream reaction node in the cascade reaction zone, according to the annular reaction window, the injection reactor is triggered to execute a coarse adjustment cascade decision based on a wide temperature range, and the injection equipment is responded to perform the first stage of denitrification treatment. By tracking the thermal zone migration from the upstream reaction node to the downstream reaction node, the injection reactor is triggered to execute a fine adjustment cascade fine adjustment in a narrow temperature range, and the injection equipment is responded to perform the second stage of denitrification treatment and export management.

[0051] Specifically, the upstream reaction node refers to the front position in the direction of flue gas flow, and the coarse adjustment reaction is usually carried out at this node. The downstream reaction node is located at the rear of the flue gas flow, and is usually used for fine adjustment reaction to further refine the denitrification effect. After the flue gas enters the cascade reaction zone, the upstream reaction node first performs preliminary coarse adjustment on the flue gas. Since the goal of the first stage is to quickly reduce the NO in the flue gas, X The concentration is high, so the jet reactor will use a larger jet volume and process within a wider temperature range. The annular reaction window is dynamically divided according to temperature changes, and the division of the reaction window is adjusted in real time according to the flow of flue gas in the pipeline.

[0052] The reaction in the wide temperature range can tolerate certain temperature fluctuations, so a larger injection volume can be used in the coarse adjustment stage to quickly reduce NO XSince the temperature range of the upstream reaction node is wide and the reaction accuracy requirement is not high, the injection volume will be relatively large. The goal of the coarse adjustment reaction is to reduce NO as quickly as possible. X concentration, rather than precise control, this stage of treatment is mainly focused on completing the main reaction task, which is the rapid degradation of nitrogen oxides.

[0053] After the flue gas is processed by the upstream reaction node, its temperature and NO X At the downstream reaction node, the flue gas enters a narrow temperature range, at which point the denitrification accuracy requirement is high, so the jet reactor will enter the fine-tuning stage to adjust the NO in the flue gas. X The concentration is further optimized. In a narrow temperature range, the temperature change is small and the reaction accuracy is required to be higher, so the injection amount is gradually reduced and fine-tuned step by step. At this time, by fine-tuning the injection amount, NO X The first stage of coarse adjustment mainly deals with larger NO X concentration, while the fine-tuning stage mainly adjusts the NO X The concentration can be processed more accurately to ensure the best denitrification effect.

[0054] Hot zone migration tracking monitors and tracks the location of hot zones based on flue gas flow and temperature changes, thereby adjusting the startup and operation strategies of different reaction nodes. Hot zone migration tracking ensures that the denitrification reaction remains within the optimal temperature range as the flue gas passes through different reaction nodes. By tracking hot zones in real time, flue gas temperature changes in the pipeline are identified, and based on these changes, a decision is made whether to initiate the reaction at the downstream node. When the flue gas enters the downstream reaction node, if the hot zone temperature is appropriate, fine-tuning will continue; if the temperature deviates from expectations, the injection rate will be readjusted or a new reaction node will be initiated.

[0055] The first stage of wide temperature range coarse adjustment treatment can quickly reduce NO in flue gas X concentration, the second stage of fine-tuning treatment can further optimize the denitrification effect within a narrow temperature range to ensure NO X The concentration reaches ultra-low emission standards. The hot zone migration tracking mechanism can monitor the temperature and NO of the flue gas in real time. X concentration, and flexibly adjust the reaction process to improve the stability and response speed of the entire denitrification system.

[0056] Furthermore, the present application S300 includes:

[0057] Initial NO in flue gas X concentration, determine the first reaction completeness, where the reaction completeness is related to NO Xconcentration is negatively correlated; based on the first reaction completeness, a first linear relationship is determined, wherein the temperature is negatively correlated with the injection amount, and the slope of the first linear relationship is positively correlated with the first reaction completeness; based on the first linear relationship, a coarse adjustment cascade outer loop is deployed.

[0058] Specifically, the initial NO X The concentration is the concentration of nitrogen oxides in the flue gas discharged by the boiler that has not been denitrified. X Therefore, the completeness of the reaction is not fixed at 0, but is determined by the detection of NO X The initial NO X When the concentration is high, the reaction completeness will be lower, and vice versa. X The concentration is 1000ppm. Through experiments and historical data, it is determined that the corresponding reaction completeness is 40%. If the NO X When the concentration drops to 500ppm, the corresponding reaction completion may be 70%. Reaction completion refers to the reaction of NO X The degree of progress of the denitrification reaction. The completeness of the reaction is an indicator to measure the efficiency of the denitrification process, usually expressed as a percentage. X The concentration is negatively correlated, which means that as NO X As the concentration decreases, the completeness of the reaction increases.

[0059] Based on the first reaction completion, the first linear relationship between temperature and injection rate is determined. As flue gas temperature changes, the required injection rate adjustment also changes. Generally speaking, higher temperatures increase the efficiency of the denitrification reaction, necessitating a reduction in the injection rate. Lower temperatures require an increase in the injection rate. For example, assuming a first reaction completion of 60%, the relationship between temperature and injection rate is: injection rate = − temperature × slope + intercept. The slope is positively correlated with reaction completion, meaning that higher reaction completion leads to greater changes in injection rate. Conversely, lower reaction completion leads to smaller changes in injection rate. For example, if the reaction completion is 40%, the injection rate may decrease by 5% for every 10°C increase in temperature. If the reaction completion is 80%, the injection rate may decrease by 8% for every 10°C increase in temperature.

[0060] According to the first linear relationship, the adjustment rule between the injection amount and the temperature is determined, and the coarse adjustment cascade outer loop is deployed. The coarse adjustment cascade outer loop is mainly responsible for adjusting the NO XThe concentration is initially adjusted to achieve the desired denitrification effect. The coarse cascade outer loop is a control link that is mainly responsible for the initial adjustment of the denitrification process within a larger temperature range. By adjusting the completeness of the first reaction, the injection amount of the injection reactor is flexibly controlled to ensure that the denitrification process can operate efficiently under different temperature conditions. In the initial stage, a larger injection amount is used to quickly reduce NO X concentration, and when the reaction is complete, the injection amount will be finely adjusted according to the temperature change. X The concentration dynamically adjusts the reaction completeness to ensure the adaptation of the reaction completeness under different working conditions, thereby achieving a more accurate denitrification effect.

[0061] Furthermore, the present application further comprises the following steps:

[0062] According to the first linear relationship, the annular reaction window is matched with the window temperature domain to determine the window injection amount, wherein the window injection amount corresponds to the annular reaction window one-to-one; according to the window injection amount, a step injection amount transition processing is performed on the boundary of the neighborhood window to determine the gradient injection amount; based on the gradient injection amount, a coarse adjustment cascade inner loop is constructed; the coarse adjustment cascade outer loop and the coarse adjustment cascade inner loop are cascaded to determine the first gradient strategy of the two-order gradient scale decision.

[0063] Specifically, based on the first linear relationship, window temperature range matching is performed on the annular reaction window. This means that the temperature distribution within the annular reaction window is matched to the injection rate, and the corresponding window injection rate for each annular reaction window is determined. Temperature changes within the annular reaction window directly affect the injection rate adjustment, ensuring that the injection rate matches the temperature conditions, thereby achieving optimal denitration results. Based on the window injection rate, a step injection rate transition is performed at the boundaries of adjacent windows to determine the gradient injection rate. The injection rate can vary significantly across adjacent temperature intervals or reaction window boundaries, leading to unstable denitration results. Therefore, a step injection rate transition is required. This involves adjusting the injection rate using a smooth transition function to achieve a more gradual change. For example, suppose the injection rate changes suddenly from 15% to 10% when the temperature changes from 750°C to 800°C. This change is too large. A transition algorithm (such as linear interpolation or a smoothing function) is used to ensure a smooth injection rate change, gradually reducing the injection rate to 12% between 750°C and 800°C.

[0064] A step injection rate transition at the boundary of a neighboring window refers to a smooth transition of injection rate at adjacent temperature intervals or reaction window boundaries, avoiding overly abrupt injection rate changes to achieve a more stable and precise denitrification effect. Gradient injection rate refers to adjusting the injection rate according to a certain gradient rule through a series of injection rate adjustment mechanisms, taking into account the change in the temperature gradient from upstream to downstream and adjusting the injection rate based on this gradient.

[0065] According to the gradient injection amount after the transition of the step injection amount, the injection amount of the reactor is further adjusted to ensure the smooth progress of the denitrification reaction, and a rough adjustment cascade inner loop is constructed. This link mainly controls NO by adjusting the rough adjustment stage of the injection amount. X Initial reduction in concentration. For example, within a wide temperature range, the coarse control loop determines a wide range of injection rate adjustments based on the temperature range. For example, when the flue gas temperature is 450°C, the injection rate might be set to 20%. When the temperature rises to 550°C, the injection rate might be reduced to 10%. The inner loop then performs preliminary injection rate control based on this coarse control result.

[0066] By cascading the outer and inner loops, combined with the changes in temperature and injection volume, the first gradient strategy is determined. The coarse adjustment inner and outer loops are responsible for rapid adjustment of the injection volume within a wide range of temperature changes. The outer loop is responsible for making large adjustments to the injection volume within a wide temperature range (i.e., a large temperature range), quickly responding to temperature changes and quickly reducing NO X The concentration plays a rough and rapid adjustment role. Similar to the outer loop, the inner loop does not enter the fine adjustment stage, but quickly adjusts the injection amount within a larger temperature range. By matching the appropriate injection amount in different temperature ranges, NO can be minimized. X concentration to ensure complete reaction.

[0067] Furthermore, the present application further comprises the following steps:

[0068] Determine a parameter-control conversion relationship of the injection component, wherein the parameter-control conversion relationship is a conversion relationship between control requirements and control parameters; convert the first gradient strategy according to the parameter-control conversion relationship, and control the injection equipment of the upstream reaction node according to the communication connection, wherein the injection equipment retrieves the denitrification reactant from the storage area.

[0069] Specifically, the parameter-control conversion relationship of the injection component is determined to match the control requirements with the control parameters. The control requirements usually include NO X The purpose of determining the parameter-control conversion relationship is to determine the current NO XThe required injection amount or reaction dose is calculated based on the concentration, temperature and other conditions to meet the denitrification requirements. For example, if the goal is to reduce NO X The concentration is reduced from 500ppm to 150ppm, and the required injection amount is calculated based on the parameter conversion relationship. X When the concentration is 500ppm, 100m³ / h of reactant needs to be injected, and when NO X When the concentration drops to 150ppm, the injection volume may be reduced to 50m³ / h.

[0070] The control demand is converted into the actual injection rate requirement through a parameter conversion relationship, thereby adjusting the operating mode of the injection equipment. Based on this parameter conversion relationship, the first gradient strategy adjusts the injection rate according to the linear relationship between temperature and injection rate. This means that the injection rate may be lower at higher temperatures and higher at lower temperatures. For example, in a higher temperature reaction zone (such as 800°C), the injection rate is 60 m³ / h, while in a lower temperature reaction zone (such as 650°C), the injection rate is 120 m³ / h.

[0071] Since the reaction zone consists of multiple nodes, each node is controlled through communication connections. Determine the control requirements of the upstream reaction nodes (such as NO X The target value of concentration reduction) is calculated, and then the required injection amount is calculated based on the parameter control conversion relationship. The injection equipment of the upstream reaction node will call an appropriate amount of denitrification reactant from the storage area according to these requirements. The denitrification reactant of the injection equipment is usually stored in a special storage area (such as a reactant storage tank). According to the control instructions transmitted from the communication connection, the injection equipment will extract the required denitrification reactant from the storage area and inject it. According to the change of the injection amount, the extraction amount of the reactant will also change. By precisely controlling the injection amount, different NO X concentration targets to ensure optimal denitrification effect in each reaction zone.

[0072] Furthermore, the present application further comprises the following steps:

[0073] For the annular reaction window, by tracking the migration of the hot zone, the window is adjusted according to the multi-level temperature value of the second division standard to determine the adjusted reaction window; X Concentration detection determines the second reaction completeness; based on the second reaction completeness and the adjusted reaction window, a two-order gradient scale decision-injection parameter control conversion is performed, and the injection equipment of the downstream reaction node is controlled according to the communication connection.

[0074] Specifically, based on the temperature distribution in the flue gas duct, the changes in flue gas temperature are monitored in real time through hot zone migration tracking. Since the temperature distribution of flue gas may be different in the duct, the annular reaction window is refined and adjusted according to the multi-level temperature values ​​of the second division standard to ensure that the reactant injection can be carried out in the most appropriate temperature range, thereby improving the reaction efficiency. For example, assuming that the temperature of the flue gas is 650°C when it enters the duct from upstream, it is more appropriate to carry out the injection reaction at this temperature. However, as the flue gas flows, the temperature may gradually drop to 550°C. The reaction window is adjusted through hot zone migration tracking to ensure that the amount of injected reactants can still maintain the best effect in the new temperature range.

[0075] When the reactant is injected into the flue gas, NO X In order to quantify the denitrification effect, the concentration of NO X Concentration detection, real-time monitoring of NO after reaction X concentration, and calculate the second reaction completeness, which is used to measure the NO after the reaction X Removal effect, usually expressed as NO X The percentage of concentration reduction. Based on the second reaction completeness and the adjusted annular reaction window, a two-step gradient scaling decision is executed. Similar to the coarse adjustment in the first stage, the second stage also follows a gradient injection pattern, but the focus is on further optimizing the reaction effect. In this stage, the injection amount is adjusted based on the target value of the second reaction completeness, using a more refined control strategy.

[0076] In the two-step gradient decision process, according to the temperature change and NO X In the first stage, the change of injection volume is relatively rough, with the focus on reducing NO X concentration; in the second stage, the system will make fine adjustments to the injection volume to ensure that the completeness of the reaction reaches the expected target. X The target concentration value is converted into specific injection parameters (such as injection volume, injection pressure, etc.). Through the communication connection, these parameters are transmitted to the injection equipment of the downstream reaction node to control the amount of reactant injected.

[0077] That is, in the second stage, by monitoring NO X concentration and calculate the second reaction completeness to determine the effect of the first stage reaction. X By comparing with the reaction completeness of the first stage, the second stage two-step gradient scale decision is executed, that is, based on the target value of the second reaction completeness, the injection amount is accurately adjusted to ensure NO XThe concentration is further reduced. Based on the two-step gradient scale decision, the goal of the injection parameter conversion is to reduce NO X Once the injection volume and injection parameters are determined, they are transmitted to the injection equipment of the downstream reaction node via a communication connection, ensuring that the downstream node can adjust the injection volume and injection method of the reactant in real time according to the latest control requirements.

[0078] Finely control NO by fine-tuning the injection volume X Compared with the first stage, the second stage requires higher precision and more detailed adjustment of injection volume to ensure the improvement of reaction completeness.

[0079] In summary, the biomass boiler denitrification method based on flue gas temperature provided in this application has the following beneficial effects:

[0080] The flue gas duct is divided into sections from the central area to the edge area to determine the annular reaction window, wherein the annular reaction window is dynamically updated based on the temperature variable; a gradient injection mode is introduced to deploy the injection reactor, and a cascade reaction zone is deployed in the flue gas duct, wherein the gradient injection mode uses first-order window matching and second-order window transition as the mode mechanism; for the upstream reaction node in the cascade reaction zone, according to the annular reaction window, the injection reactor is triggered to execute a coarse adjustment cascade decision based on a wide temperature range, and responds to the injection equipment to perform the first stage of denitrification treatment, and by tracking the hot zone migration from the upstream reaction node to the downstream reaction node, the injection reactor is triggered to execute a fine adjustment cascade fine-tuning in a narrow temperature range, and responds to the injection equipment to perform the second stage of denitrification treatment and export management. In other words, the pipeline cross-section is divided into dynamic reaction windows based on the flue gas temperature to achieve regional precise processing; a gradient injection mode is introduced, and a gradient strategy is constructed according to the temperature-injection volume relationship to optimize the denitrification agent injection and improve the reaction efficiency; graded denitrification control is adopted, and the upstream wide temperature range coarse adjustment quickly reduces the nitrogen oxide concentration, and the downstream narrow temperature range fine adjustment is further optimized, combined with flexible adjustment of hot zone tracking to ensure that the denitrification efficiency in different temperature ranges is optimized and the denitrification efficiency is comprehensively improved.

[0081] Example 2: Based on the same inventive concept as the biomass boiler denitrification method based on flue gas temperature in the above-mentioned Example 1, this application also provides a biomass boiler denitrification system based on flue gas temperature, please refer to the attached Figure 2 The biomass boiler denitrification system based on flue gas temperature includes:

[0082] The cross-section division module 11 is used to divide the flue gas duct into cross-sections based on the central area to the edge area, and determine the annular reaction window, wherein the temperature variable is used as the division basis and the annular reaction window is dynamically updated; the reactor deployment module 12 is used to introduce a gradient injection mode to deploy the injection reactor and deploy a cascade reaction zone in the flue gas duct, wherein the gradient injection mode uses first-order window matching and second-order window transition as the mode mechanism; the denitrification treatment module 13 is used to trigger the injection reactor to execute a coarse adjustment cascade decision based on a wide temperature range for the upstream reaction node in the cascade reaction zone according to the annular reaction window, and respond to the injection equipment to perform the first stage of denitrification treatment, and trigger the injection reactor to perform a fine adjustment cascade fine adjustment in a narrow temperature range by tracking the thermal zone migration from the upstream reaction node to the downstream reaction node, and respond to the injection equipment to perform the second stage of denitrification treatment and export management.

[0083] Furthermore, the cross-section division module 11 in the biomass boiler denitrification system based on flue gas temperature is further used for:

[0084] Divide the temperature values ​​into multiple levels, wherein the multiple levels of temperature values ​​include a first division standard based on a wide temperature range and a second division standard based on a narrow temperature range; as the flue gas enters the pipeline, thermal imaging temperature measurement is triggered to determine a cross-sectional temperature map; with the cross-sectional temperature map, perform an annular window division of the multiple levels of temperature values ​​based on the first division standard to determine the annular reaction window.

[0085] Furthermore, the reactor deployment module 12 in the biomass boiler denitrification system based on flue gas temperature is further configured to:

[0086] According to the gradient injection mode, based on NO X The linear relationship between temperature and injection amount determined based on the reaction completeness of concentration constraint is used as a benchmark, and the two-order gradient scale decision-injection parameter control is converted into a decision target to supervise the training of the injection reactor; and a communication connection between the injection reactor and the injection equipment deployed in the cascade reaction zone is established.

[0087] Furthermore, the reactor deployment module 12 in the biomass boiler denitrification system based on flue gas temperature is further configured to:

[0088] The cascade reaction zone includes at least two reaction nodes; selective denitration triggering of the cascade reaction zone is performed according to the reaction completeness.

[0089] Furthermore, the denitration processing module 13 in the biomass boiler denitration system based on flue gas temperature is further used for:

[0090] Initial NO in flue gas X concentration, determine the first reaction completeness, where the reaction completeness is related to NO Xconcentration is negatively correlated; based on the first reaction completeness, a first linear relationship is determined, wherein the temperature is negatively correlated with the injection amount, and the slope of the first linear relationship is positively correlated with the first reaction completeness; based on the first linear relationship, a coarse adjustment cascade outer loop is deployed.

[0091] Furthermore, the denitration processing module 13 in the biomass boiler denitration system based on flue gas temperature is further used for:

[0092] According to the first linear relationship, the annular reaction window is matched with the window temperature domain to determine the window injection amount, wherein the window injection amount corresponds to the annular reaction window one-to-one; according to the window injection amount, a step injection amount transition processing is performed on the boundary of the neighborhood window to determine the gradient injection amount; based on the gradient injection amount, a coarse adjustment cascade inner loop is constructed; the coarse adjustment cascade outer loop and the coarse adjustment cascade inner loop are cascaded to determine the first gradient strategy of the two-order gradient scale decision.

[0093] Furthermore, the denitration processing module 13 in the biomass boiler denitration system based on flue gas temperature is further used for:

[0094] Determine a parameter-control conversion relationship of the injection component, wherein the parameter-control conversion relationship is a conversion relationship between control requirements and control parameters; convert the first gradient strategy according to the parameter-control conversion relationship, and control the injection equipment of the upstream reaction node according to the communication connection, wherein the injection equipment retrieves the denitrification reactant from the storage area.

[0095] Furthermore, the denitration processing module 13 in the biomass boiler denitration system based on flue gas temperature is further used for:

[0096] For the annular reaction window, by tracking the migration of the hot zone, the window is adjusted according to the multi-level temperature value of the second division standard to determine the adjusted reaction window; X Concentration detection determines the second reaction completeness; based on the second reaction completeness and the adjusted reaction window, a two-order gradient scale decision-injection parameter control conversion is performed, and the injection equipment of the downstream reaction node is controlled according to the communication connection.

[0097] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. Figure 1 The biomass boiler denitrification method based on flue gas temperature and the specific examples in Example 1 are also applicable to the biomass boiler denitrification system based on flue gas temperature in this embodiment. Through the above detailed description of the biomass boiler denitrification method based on flue gas temperature, those skilled in the art can clearly understand the biomass boiler denitrification system based on flue gas temperature in this embodiment, so for the sake of brevity of the specification, it will not be described in detail here.

[0098] Example three, based on the same inventive concept as the biomass boiler denitrification method based on flue gas temperature in the aforementioned Example one, the present application also provides an electronic device, comprising: at least one processor; a memory communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the steps of the biomass boiler denitrification method based on flue gas temperature described in any one of the aforementioned Example one.

[0099] Attachment Figure 3 This is a schematic diagram of the structure of an exemplary electronic device of this application. Figure 3 In the figure, the bus architecture is represented by bus 300, which can include any number of interconnected buses and bridges. Bus 300 connects various circuits including one or more processors represented by processor 302 and memory represented by memory 304. Bus 300 can also connect various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are all well known in the art and therefore will not be described further herein. Bus interface 305 provides an interface between bus 300 and receiver 301 and transmitter 303. Receiver 301 and transmitter 303 can be the same component, namely a transceiver, which provides a unit for communicating with various other devices over a transmission medium. Processor 302 is responsible for managing bus 300 and general processing, while memory 304 can be used to store data used by processor 302 when performing operations.

[0100] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

[0101] Obviously, for those skilled in the art, several improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the scope of protection of the present application.

Claims

1. A biomass boiler denitrification method based on flue gas temperature, characterized in that: include: The flue gas duct is divided into sections from the central area to the edge area to determine an annular reaction window, wherein the annular reaction window is dynamically updated based on the temperature variable; A gradient injection mode is introduced to deploy a jet reactor, and a cascade reaction zone is deployed in the flue gas duct, wherein the gradient injection mode uses first-order window matching and second-order window transition as the mode mechanism; For the upstream reaction node in the cascade reaction zone, according to the annular reaction window, the injection reactor is triggered to perform a coarse adjustment cascade decision based on a wide temperature range, and the injection equipment is responded to perform the first stage of denitration treatment. By tracking the hot zone migration from the upstream reaction node to the downstream reaction node, the injection reactor is triggered to perform a fine adjustment cascade fine adjustment in a narrow temperature range, and the injection equipment is responded to perform the second stage of denitration treatment and export management; Triggering the injection reactor to execute a coarse adjustment cascade decision based on a wide temperature range includes: Initial NO in flue gas X concentration, determine the first reaction completeness, where the reaction completeness is related to NO X The concentration was negatively correlated; Determining a first linear relationship based on the first reaction completeness, wherein temperature is negatively correlated with injection amount, and a slope of the first linear relationship is positively correlated with the first reaction completeness; deploying a coarse adjustment cascade outer loop according to the first linear relationship; By tracking the thermal zone migration from the upstream reaction node to the downstream reaction node, the jet reactor is triggered to perform fine-tuning cascade fine-tuning in a narrow temperature range, including: For the annular reaction window, by tracking the migration of the hot zone, adjusting the window according to the multi-level temperature values ​​of the second division standard to determine the adjusted reaction window; By NO X Concentration detection determines the completeness of the second reaction; According to the second reaction completeness and the adjustment reaction window, a two-order gradient scale decision-injection parameter control conversion is performed, and the injection equipment of the downstream reaction node is controlled according to the communication connection.

2. The biomass boiler denitrification method based on flue gas temperature according to claim 1, characterized in that: Determining the annular reaction window includes: Dividing the temperature values ​​into multiple levels, wherein the multiple levels of temperature values ​​include a first division standard based on a wide temperature range and a second division standard based on a narrow temperature range; As the flue gas enters the duct, thermal imaging temperature measurement is triggered to determine the cross-sectional temperature map; The cross-sectional temperature graph is used to perform annular window segmentation based on the multi-level temperature values ​​of the first segmentation standard to determine the annular reaction window.

3. The biomass boiler denitrification method based on flue gas temperature according to claim 1, characterized in that: The gradient injection mode was introduced to deploy the injection reactor, including: According to the gradient injection mode, based on NO X The linear relationship between temperature and injection amount determined based on the reaction completeness of concentration constraint is used as a benchmark, and the injection parameter control is converted into a decision target using a two-order gradient scale decision-making method to supervise the training of the injection reactor; A communication connection is established between the injection reactor and the injection equipment deployed in the cascade reaction zone.

4. The biomass boiler denitrification method based on flue gas temperature according to claim 1, characterized in that: After deploying the coarse adjustment cascade outer loop, it includes: performing window temperature range matching on the annular reaction window according to the first linear relationship to determine a window injection amount, wherein the window injection amount corresponds to the annular reaction window in a one-to-one manner; According to the window injection amount, a step injection amount transition process is performed on the neighborhood window boundary to determine the gradient injection amount; Based on the gradient injection amount as a benchmark, a coarse adjustment cascade inner loop is constructed; The coarse adjustment cascade outer loop and the coarse adjustment cascade inner loop are cascaded to determine a first gradient strategy for the two-order gradient scaling decision.

5. The biomass boiler denitrification method based on flue gas temperature according to claim 4, characterized in that: After determining the first gradient strategy of the two-order gradient scaling decision, the method includes: Determining a parameter-control conversion relationship of the injection assembly, wherein the parameter-control conversion relationship is a conversion relationship between control requirements and control parameters; The first gradient strategy is converted according to the parameter-control conversion relationship, and the injection device of the upstream reaction node is controlled according to the communication connection, wherein the injection device retrieves the denitration reactant from the storage area.

6. The biomass boiler denitrification method based on flue gas temperature according to claim 1, characterized in that: The cascade reaction zone includes at least two reaction nodes; According to the reaction completeness, the selective denitrification triggering of the cascade reaction zone is performed.

7. Biomass boiler denitrification system based on flue gas temperature, characterized in that: The steps for implementing the biomass boiler denitrification method based on flue gas temperature according to any one of claims 1 to 6, wherein the biomass boiler denitrification system based on flue gas temperature comprises: A cross-section division module is used to divide the flue gas duct into sections from the center to the edge, and determine an annular reaction window, wherein the temperature variable is used as the division basis, and the annular reaction window is dynamically updated; A reactor deployment module is used to deploy a jet reactor by introducing a gradient injection mode, and to deploy a cascade reaction zone in a flue gas duct, wherein the gradient injection mode uses a first-order window matching and a second-order window transition as a mode mechanism; The denitrification processing module is used to trigger the injection reactor to execute a coarse adjustment cascade decision based on a wide temperature range for the upstream reaction node in the cascade reaction zone according to the annular reaction window, and respond to the injection equipment to perform the first stage of denitrification processing, and trigger the injection reactor to execute a fine adjustment cascade fine adjustment in a narrow temperature range by tracking the thermal zone migration from the upstream reaction node to the downstream reaction node, and respond to the injection equipment to perform the second stage of denitrification processing and export management.

8. An electronic device, characterized in that: include: at least one processor; a memory communicatively coupled to the at least one processor; Wherein, the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the steps of the biomass boiler denitrification method based on flue gas temperature as described in any one of claims 1 to 6.

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