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

Abstract

The invention provides a flue gas temperature-based biomass boiler denitration method, system and equipment, and relates to the technical field of flue gas purification, the method comprises the following steps: carrying out section division on a flue gas pipeline, and determining an annular reaction window; introducing a gradient injection mode to deploy an injection reactor, and deploying a cascade reaction area in a flue gas pipeline; aiming at the upstream reaction node, according to the annular reaction window, executing coarse adjustment cascade decision based on a wide temperature range, responding to the injection equipment to perform first-stage denitration treatment, and executing fine adjustment cascade fine adjustment of a narrow temperature range by performing hot area migration tracking from the upstream reaction node to the downstream reaction node; and performing second-stage denitration treatment and export management in response to the injection equipment. The technical problem that in the prior art, the denitration efficiency is low due to the fact that the temperature of a biomass boiler is uneven, smoke components are complex and variable, and accurate regulation and control are difficult is solved, and the denitration efficiency is improved by introducing a gradient injection mode and graded denitration control.

Description

Technical Field

[0001] This application relates to the technical field of flue gas purification, and particularly to a denitration method, system and equipment for biomass boilers based on flue gas temperature. Background Art

[0002] In practical applications of biomass boilers, due to the instability of fuel components and the difference in furnace temperature, they often face the problem of excessive nitrogen oxide emissions. At present, the commonly used denitration technologies mainly include selective non-catalytic reduction (SNCR) and selective catalytic reduction (SCR). The SNCR technology does not require the use of a catalyst. Instead, a reducing agent is injected into the flue gas, and the reducing agent reacts with nitrogen oxides at high temperatures to reduce the emissions of nitrogen oxides. However, the reaction temperature required by the SNCR technology is usually between 800°C and 1200°C, while the furnace temperature of biomass boilers is mostly around 650°C. The influence of temperature will result in a low denitration rate of biomass boilers, failing to meet the requirements of ultra-low emissions. The SCR technology uses a denitration catalyst to react nitrogen oxides in the flue gas with a reducing agent to generate harmless nitrogen and water vapor. Although the SCR technology has a high denitration efficiency, the alkali metals in the flue gas of biomass boilers are likely to cause catalyst poisoning and the cost is high. Due to the diversity of fuel composition and the uneven distribution of furnace temperature in biomass boilers, the flue gas temperature fluctuates greatly, and the flue gas composition has strong time-variability, making it difficult for traditional denitration technologies to achieve precise regulation in different temperature regions, resulting in low denitration efficiency and unable to meet the increasingly strict ultra-low emission standards.

[0003] In summary, there is a technical problem in the prior art that due to the uneven temperature of biomass boilers and the complex and variable flue gas composition, it is difficult to accurately control, resulting in low denitration efficiency. Summary of the Invention

[0004] The purpose of this application is to provide a denitration method, system and equipment for biomass boilers based on flue gas temperature, so as to solve the technical problem in the prior art that due to the uneven temperature of biomass boilers and the complex and variable flue gas composition, it is difficult to accurately control, resulting in low denitration efficiency.

[0005] In view of the above problems, this application provides a denitration method, system and equipment for biomass boilers based on flue gas temperature.

[0006] In a first aspect, the present application provides a denitrification method for a biomass boiler based on flue gas temperature. The denitrification method for a biomass boiler based on flue gas temperature is implemented through a denitrification system for a biomass boiler based on flue gas temperature. Among them, the denitrification method for a biomass boiler based on flue gas temperature includes: dividing the cross-section of the flue gas pipeline from the central area to the edge area to determine an annular reaction window. Among them, based on the temperature variable as the division basis, the annular reaction window is dynamically updated; introducing a gradient injection mode to deploy an injection reactor, and deploying a cascade reaction zone in the flue gas pipeline. Among them, the gradient injection mode is based on the first-order window matching and the second-order window transition as the mode mechanism; for the upstream reaction nodes in the cascade reaction zone, according to the annular reaction window, triggering the injection reactor to execute a coarse-tuning cascade decision based on a wide temperature range, responding to the injection equipment for the first-stage denitrification treatment, and through tracking the heat zone migration from the upstream reaction node to the downstream reaction node, triggering the injection reactor to execute a fine-tuning cascade fine-tuning in a narrow temperature range, responding to the injection equipment for the second-stage denitrification treatment and export management.

[0007] Optionally, divide multiple temperature values. Among them, the multiple temperature values include a first division criterion based on a wide temperature range and a second division criterion based on a narrow temperature range; as the flue gas enters the pipeline, trigger thermal imaging temperature measurement to determine the cross-section temperature map; based on the cross-section temperature map, perform annular window sub-division of the multiple temperature values based on the first division criterion to determine the annular reaction window.

[0008] Optionally, according to the gradient injection mode, based on the linear relationship between temperature and injection amount determined based on the reaction completeness constrained by NO X concentration, taking the two-step gradient scale decision-injection parameter control conversion as the decision target, supervising and training the injection reactor; establishing a communication connection between the injection reactor and the injection equipment deployed inside the cascade reaction zone.

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

[0010] Optionally, based on the initial NO X concentration of the flue gas, determine the first reaction completeness. Among them, the reaction completeness is negatively correlated with the NO X concentration; according to the first reaction completeness, determine the first linear relationship. Among them, the temperature and the injection amount are negatively correlated, and the slope of the first linear relationship is positively correlated with the first reaction completeness; according to the first linear relationship, deploy a coarse-tuning cascade outer loop.

[0011] Optionally, according to the first linear relationship, perform window temperature range matching on the annular reaction window to determine the window injection amount, where the window injection amount corresponds one-to-one with the annular reaction window; according to the window injection amount, perform step injection amount transition processing on the neighborhood window boundary to determine the gradient injection amount; based on the gradient injection amount, construct a coarse-tuning cascade inner loop; cascade the coarse-tuning cascade outer loop and the coarse-tuning cascade inner loop to determine the first gradient strategy of the two-step gradient scale decision-making.

[0012] Optionally, determine the control parameter conversion relationship of the injection component, where the control parameter conversion relationship is the conversion relationship between the control requirement and the control parameter; according to the control parameter conversion relationship, convert the first gradient strategy, and control the injection device of the upstream reaction node according to the communication connection, where the injection device retrieves the denitration reactant from the storage area.

[0013] Optionally, for the annular reaction window, by performing hot zone migration tracking, according to the multi-level temperature values of the second division criterion, perform window adjustment to determine the adjusted reaction window; through NO X concentration detection to determine the second reaction completion degree; according to the second reaction completion degree and the adjusted reaction window, perform two-step gradient scale decision-making - injection control parameter conversion, and control the injection device of the downstream reaction node according to the communication connection.

[0014] In a second aspect, the present application further provides a biomass boiler denitration system based on flue gas temperature, which is used to execute the biomass boiler denitration method based on flue gas temperature as described in the first aspect, where the biomass boiler denitration system based on flue gas temperature includes: a cross-section division module, which is used to perform cross-section division on the flue gas pipeline from the central area to the edge area to determine the annular reaction window, where the annular reaction window is dynamically updated based on the temperature variable; a reactor deployment module, which is used to deploy the injection reactor by introducing the gradient injection mode and deploy the cascade reaction area in the flue gas pipeline, where the gradient injection mode is based on the first-order window matching and the second-order window transition as the mode mechanism; a denitration treatment module, which is used to trigger the injection reactor to execute the coarse-tuning cascade decision-making based on the wide temperature range for the upstream reaction node in the cascade reaction area, respond to the injection device to perform the first-stage denitration treatment, and by performing hot zone migration tracking from the upstream reaction node to the downstream reaction node, trigger the injection reactor to execute the fine-tuning cascade fine-tuning in the narrow temperature range, and respond to the injection device to perform the second-stage denitration treatment and export management.

[0015] In a third aspect, the present application also provides an electronic device, including: 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 when the instructions are executed by the at least one processor, the at least one processor is enabled to execute the steps of the biomass boiler denitration method based on flue gas temperature according to any one of the above first aspects.

[0016] One or more technical solutions provided in the present application have at least the following beneficial effects: By dividing the cross-section of the flue gas duct 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; introducing a gradient injection mode to deploy an injection reactor and deploying a cascade reaction area in the flue gas duct, wherein the gradient injection mode is based on the first-order window matching and the second-order window transition as the mode mechanism; for the upstream reaction nodes in the cascade reaction area, according to the annular reaction window, triggering the injection reactor to execute a wide-temperature-range coarse-tuning cascade decision, and responding to the injection device for the first-stage denitration treatment. By tracking the hot zone migration from the upstream reaction nodes to the downstream reaction nodes, triggering the injection reactor to execute a narrow-temperature-range fine-tuning cascade fine-tuning, and responding to the injection device for the second-stage denitration treatment and export management. That is to say, a dynamic reaction window is divided based on the flue gas temperature to achieve regionalized precise treatment; introducing a gradient injection mode, constructing a gradient strategy based on the temperature-injection amount relationship, optimizing the denitration agent injection, and improving the reaction efficiency; adopting hierarchical denitration control, quickly reducing the nitrogen oxide concentration in the upstream wide-temperature range by coarse-tuning, further optimizing in the downstream narrow-temperature range by fine-tuning, and flexibly adjusting in combination with hot zone tracking to ensure that the denitration efficiency reaches the optimum in different temperature ranges and comprehensively improves the denitration efficiency.

[0017] The above description is only an overview of the technical solutions of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specific embodiments of the present application are specifically given. It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become easily understood through the following description. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0019] Figure 1 This is a schematic flow chart of the biomass boiler denitration method based on flue gas temperature in this application.

[0020] Figure 2 This is a schematic structural diagram of the biomass boiler denitration system based on flue gas temperature in this application.

[0021] Figure 3 This is a schematic structural diagram of an exemplary electronic device in this application.

[0022] Explanation of reference numerals: cross-section division module 11, reactor deployment module 12, denitration treatment module 13, bus 300, receiver 301, processor 302, transmitter 303, memory 304, bus interface 305. Detailed implementation manners

[0023] By providing a biomass boiler denitration method, system and device based on flue gas temperature, this application solves the technical problem in the prior art that due to uneven temperature and complex and variable flue gas components in the biomass boiler, it is difficult to accurately control, resulting in low denitration efficiency. Dynamically dividing the pipeline cross-section into reaction windows based on the flue gas temperature to achieve regionalized and precise treatment; introducing a gradient injection mode, constructing a gradient strategy according to the temperature-injection amount relationship to optimize the injection of denitration agent and improve the reaction efficiency; adopting hierarchical denitration control, coarsely adjusting in a wide temperature range in the upstream to quickly reduce the nitrogen oxide concentration, and finely adjusting in a narrow temperature range in the downstream for further optimization, combined with hot zone tracking for flexible adjustment, ensuring that the denitration efficiency reaches the optimum in different temperature intervals and comprehensively improving the denitration efficiency.

[0024] Next, the technical solutions in this application will be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a 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 by the example embodiments described here. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application. Additionally, it should be noted that for the sake of description, only parts related to this application are shown in the drawings rather than all.

[0025] Embodiment 1. Please refer to the attached Figure 1 In this application, a biomass boiler denitration method based on flue gas temperature is provided. Among them, the biomass boiler denitration method based on flue gas temperature is executed by a biomass boiler denitration system based on flue gas temperature. The biomass boiler denitration method based on flue gas temperature specifically includes the following steps: S100: Perform cross-section division on the flue gas pipeline from the central area to the edge area to determine an annular reaction window. Among them, based on the temperature variable as the division basis, the annular reaction window is dynamically updated.

[0026] Further, the S100 of the present application includes: Divide multi-level temperature values, where the multi-level temperature values include a first division criterion based on a wide temperature range and a second division criterion based on a narrow temperature range; as the flue gas enters the pipeline, trigger thermal imaging temperature measurement to determine the cross-sectional temperature map; use the cross-sectional temperature map to perform annular window sub-region division of the multi-level temperature values based on the first division criterion to determine the annular reaction window.

[0027] Specifically, according to the geometric structure and flow characteristics of the flue gas pipeline, the flue gas pipeline is divided into a central area and an edge area. The central area of the flue gas pipeline is usually an area where the gas flow velocity and temperature are relatively uniform, while in the edge area, due to flow instability or wall effects, there may be significant changes in temperature and gas flow velocity. According to the temperature changes in the flue gas pipeline, using the temperature variable as the division basis to dynamically adjust the annular reaction window means that as the flue gas flows, the temperature will continuously 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 regions.

[0028] Dividing multi-level temperature values, that is, dividing the flue gas temperature into multiple intervals, each interval corresponding to different temperature characteristics, helps to refine the control of the temperature region. The wide temperature range refers to the region with a large temperature change range, while the narrow temperature range refers to the region with a small temperature change range. During the denitrification process, the wide temperature range is generally used for rough adjustment, while the narrow temperature range is used for fine adjustment. According to the overall distribution of the flue gas temperature, determine a relatively broad temperature interval, that is, the first division criterion. For some regions with small temperature changes, adopt the narrow temperature range division criterion to determine the second division criterion.

[0029] Inside the flue gas pipeline, use infrared imaging technology to monitor the distribution and changes of the flue gas temperature in real time and draw a cross-sectional temperature map. The cross-sectional temperature map is a temperature distribution map, indicating the temperature distribution of each cross-section (from the central area to the edge area) of the flue gas pipeline, helping to judge the temperature characteristics at different positions. As the flue gas flows, the temperature will change, and the reaction window is adjusted according to the new temperature data, that is, the annular reaction window is dynamically updated.

[0030] According to the determined cross-sectional temperature map, divide the temperature range within the cross-section into several large intervals according to the first division criterion. For example, if the temperature range in the flue gas duct is from 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, etc. according to the amplitude of temperature fluctuations. Each temperature interval corresponds to an annular reaction window. According to the divided temperature intervals, determine the annular reaction window. The annular reaction window usually distributes according to the cross-section of the flue gas duct, presenting an annular structure. Each annular region corresponds to a specific temperature interval, and the denitrification reaction therein can be optimized according to temperature conditions. The denitrification efficiency was compared before and after dividing the annular window. Without division, the denitrification efficiency was 65%, and the nitrogen oxide emission concentration was 120 mg / m³; after dividing the annular window, the denitrification efficiency increased to 85%, and the nitrogen oxide emission concentration decreased to 50 mg / m³, significantly improving the denitrification effect.

[0031] Since the flue gas temperature changes with flow, the division of the annular reaction window should be dynamically updated according to the real-time temperature map. When the temperature changes, re-divide the annular reaction window and adjust the operation mode of the injection reactor accordingly to adapt to the new temperature conditions. By using thermal imaging temperature measurement technology to obtain the temperature distribution of the flue gas duct in real time, the temperature characteristics of different regions can be accurately grasped, so as to dynamically adjust the reaction window. Precise temperature division and dynamic update of the reaction window improve the denitrification efficiency and significantly reduce nitrogen oxide emissions.

[0032] S200: Introduce a gradient injection mode to deploy the injection reactor and deploy a cascade reaction zone in the flue gas duct, where the gradient injection mode is based on the mechanism of first-order window matching and second-order window transition.

[0033] Furthermore, S200 of this application includes: According to the gradient injection mode, using the linear relationship between temperature and injection volume determined based on the reaction completeness constrained by NO X concentration as a benchmark, and using two-step gradient scale decision - injection parameter control conversion as the decision-making goal, supervise and train the injection reactor; establish a communication connection between the injection reactor and the injection equipment deployed inside the cascade reaction zone.

[0034] Furthermore, this application also includes the following steps: The cascade reaction zone includes at least two reaction nodes; according to the reaction completeness, perform selective denitrification triggering in the cascade reaction zone.

[0035] Specifically, a gradient injection mode is introduced, which is a mode that adjusts the injection dose according to the temperature gradient or changes in the reaction zone. In the gradient injection mode, the adjustment of the injection dose is incremented or decremented step by step, rather than making a large adjustment all at once. Through the hierarchical management of temperature and concentration, it is ensured that the injection reactor can make precise responses under different conditions, optimizing the denitrification effect. First-order window matching refers to meeting the reaction requirements by roughly adjusting the injection dose in a wide temperature range, and making a rough adjustment of the injection dose according to a relatively large temperature interval, so the accuracy requirement is relatively low. Second-order window transition is to make a more refined adjustment in a narrow temperature range, which is a further optimization of the effect in the first stage. For example, in the first-order window matching (wide temperature range), due to large temperature fluctuations, the injection reactor makes a large adjustment of the injection volume in this temperature interval. For every 20°C change in temperature, the injection volume increases by 15%. At this stage, the nitrogen oxide concentration is reduced from 400 mg / m³ to 150 mg / m³. In the second-order window transition (narrow temperature range), the temperature change is small, and the injection reactor makes a refined adjustment. For every 5°C change in temperature, the injection volume increases by 2%, and the nitrogen oxide concentration is further reduced from 150 mg / m³ to 5 mg / m³.

[0036] In practical applications, the main goal of denitrification is to reduce NO X concentration in flue gas. Therefore, the NO X concentration is used as the main constraint condition for the denitrification reaction. By real-time monitoring the NO X concentration in flue gas and adjusting the injection dose according to the target concentration, the reactor can gradually achieve the denitrification goal. The reaction completion degree is an important indicator to measure the reaction effect, usually expressed as the percentage reduction of NO X degree. If the injection volume and reaction conditions are appropriate, the reaction completion degree should be close to 100%, that is, the NO X concentration is reduced to the lowest. That is to say, the NO X concentration constraint means that during the denitrification process, the adjustment target of the injection reactor is to ensure that the NO X concentration in flue gas is reduced to a certain predetermined safe range as the measurement standard of the reaction effect. By adjusting the injection volume, it is ensured that the denitrification reaction is complete and the denitrification goal is achieved. The reaction completion degree refers to the completion degree of the denitrification reaction under specific conditions. The higher the reaction completion degree, the better the denitrification reaction efficiency, and the more thoroughly the NO X concentration is reduced.

[0037] There is a linear relationship between temperature and injection volume, indicating how temperature changes directly affect the injection dose of the injection reactor. As the flue gas temperature fluctuates, the injection volume of the injection reactor needs to be dynamically adjusted according to this linear relationship. During the flue gas flow process, temperature and NO XThe change in concentration may be gradual. Two-step gradient scale decision-making is adopted, that is, different spraying adjustment strategies are adopted in different temperature regions. When the flue gas temperature changes greatly, a larger spraying dose adjustment is adopted. For example, in the first gradient (coarse adjustment in a wide temperature range), when the temperature change exceeds 20 °C, the spraying amount may be adjusted once every 5% change. In the second gradient (fine adjustment in a narrow temperature range), that is, when the temperature change is small and tends to be stable, a more refined spraying dose adjustment is adopted. When the temperature change is less than 5 °C each time, the spraying amount is adjusted by 1%-2% each time. The spraying parameter control conversion automatically selects the appropriate adjustment mode (coarse adjustment or fine adjustment) according to the real-time NO X concentration and temperature data to ensure that the spraying reactor is always in the best working condition.

[0038] Obtain historical data on flue gas temperature, NO X concentration, spraying amount, etc. from historical denitrification records as the input and target output of training. For different flue gas temperatures, select an appropriate spraying amount to achieve the best NO X removal effect. Generally, when the temperature is higher, the NO X removal efficiency is higher, so the spraying amount can be appropriately reduced. By analyzing the relationship between the spraying amount and NO X concentration at different temperatures, a linear relationship between temperature and spraying amount is constructed. The entire 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-making of the two-step gradient is based on the real-time feedback of flue gas temperature and NO X concentration, and automatically determines the spraying amount at each stage. Use regression analysis or neural network algorithms for model training. Use the temperature and NO X concentration in the dataset for model training to determine the coarse adjustment relationship between the spraying amount and NO X concentration in the wide temperature range. At this time, the goal of the model is to quickly reduce the NO X concentration to a lower range. Use a more refined dataset to train the fine adjustment relationship between the spraying amount and NO X concentration in the narrow temperature range. During the training process, the goal is to minimize the error function, usually calculated by the mean square error. Through training, optimize the model parameters until the error is minimized.

[0039] Use the method of cross-validation to evaluate the performance of the model. By dividing the data into multiple subsets, training the model with different subsets respectively, and finally evaluating the average performance of the model. Use R² (coefficient of determination) to evaluate the fitting degree of the model to the data. The closer the value is to 1, the more accurate the model is. Adjust the parameters used in the training process, such as the learning rate, batch size, etc. Fine-tune the model to ensure that the spraying reactor can accurately control the NO X concentration during actual operation. During the actual operation of the spraying reactor, by real-time monitoring of flue gas temperature, NO XConcentration and injection volume, adjust the operation of the injection reactor to ensure that the optimal NO X removal efficiency is always maintained.

[0040] The injection reactor refers to that in the denitrification process, the injection reactor injects reducing agents (such as ammonia, urea solution, etc.) into the flue gas to react with nitrogen oxides and reduce the emission of nitrogen oxides. The cascade reaction zone refers to that in the flue gas treatment system, the flue gas pipeline is divided into multiple reaction zones, and each zone is optimized for different reaction conditions, including at least two reaction nodes (such as the upstream reaction node and the downstream reaction node), and each node performs different denitrification functions. The upstream reaction node refers to that when the flue gas just enters the reaction zone, the temperature is usually high, and this can be used for rough adjustment to quickly reduce the NO X concentration. The downstream reaction node refers to that as the flue gas enters the downstream, the temperature is usually low, and at this time fine adjustment can be carried out to further reduce the NO X concentration.

[0041] The reaction completeness is one of the most important evaluation indicators in the entire denitrification process, which determines whether each reaction node needs to continue to work, that is, the denitrification efficiency during the reaction process, usually expressed by the removal rate of NO X . The higher the reaction completeness, the better the removal effect of NO X . The evaluation of the reaction completeness usually depends on NO X concentration, flue gas temperature, injection volume, etc. By real-time monitoring the change of NO X concentration in the flue gas and dynamically adjusting the denitrification process of the reaction node according to the data feedback.

[0042] Evaluate the reaction completeness of each node through real-time monitoring of the NO X concentration in the flue gas. When the reaction completeness after executing a certain node reaches the standard, it means that the node has achieved the set NO X removal effect. At this time, it can be selected not to continue to start the remaining nodes, or only let it play a guiding role in the pipeline. The selective denitrification trigger mechanism decides whether to start the denitrification process of a certain reaction node according to the evaluation result of the reaction completeness. When the reaction completeness is lower than the set standard (that is, the NO X concentration fails to be effectively reduced), the denitrification reaction of other nodes will continue to be triggered to further reduce the NO X concentration.

[0043] Establish a communication connection between the injection reactor and the injection equipment deployed in the cascade reaction zone to transmit reaction data and control information in real time, so that the injection reactor can be dynamically adjusted according to the actual flue gas situation. The injection reactor and the injection equipment in the cascade reaction zone need to use a standard communication protocol for data exchange. The data exchanged in the communication mainly includes: flue gas temperature, NOX Concentration, injection volume, reaction progress status, etc. Install temperature sensors, NO X sensors, flow sensors, etc. in the flue gas pipeline to monitor the flue gas status in real time. Transmit the data monitored by the sensors to the injection reactor, and the injection reactor can adjust the injection volume of the injection equipment in real time according to the changes in temperature and NO X concentration.

[0044] Each reaction node in the cascade reaction zone will decide whether to continue to initiate the denitrification reaction according to the evaluation result of the reaction completion degree. When the flue gas passes through the first reaction node, the NO X concentration is relatively high, and coarse adjustment is required through the injection reactor. After the flue gas passes through a certain reaction node, evaluate the denitrification effect (i.e., the reaction completion degree) according to the change in NO X concentration. If the standard has been reached, the remaining nodes will not be triggered, and only the pipeline diversion function will be performed. Through the gradient injection mode, coarse adjustment and fine adjustment can be carried out in different temperature ranges, so as to optimize the denitrification effect and maximize the reduction of NO X concentration. The selective denitrification trigger mechanism ensures that the denitrification reaction is only carried out when necessary, avoiding excessive treatment of unnecessary reaction nodes and saving the use of injection agents.

[0045] S300: For the upstream reaction nodes in the cascade reaction zone, according to the annular reaction window, trigger the injection reactor to execute a coarse adjustment cascade decision based on a wide temperature range, respond to the injection equipment for the first-stage denitrification treatment, and trigger the injection reactor to execute a fine adjustment cascade fine-tuning in a narrow temperature range by tracking the heat zone migration from the upstream reaction node to the downstream reaction node, and respond to the injection equipment for the second-stage denitrification treatment and export management.

[0046] Specifically, the upstream reaction node refers to a relatively forward position in the flue gas flow direction. Usually, the coarse adjustment reaction is carried out at this node. The downstream reaction node is located behind 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 X concentration in the flue gas, at this time, the injection reactor will use a larger injection volume and process in a wider temperature range. The annular reaction window is dynamically divided according to the temperature change, and the division of the reaction window is adjusted in real time according to the flow of the flue gas in the pipeline.

[0047] The reaction in the wide temperature range can tolerate a certain temperature fluctuation. Therefore, a larger injection volume can be used in the coarse adjustment stage to quickly reduce NO XConcentration. Since the temperature range of the upstream reaction node is relatively wide and the reaction precision requirement is not high, the injection volume will be relatively large. The goal of the coarse adjustment reaction is to rapidly reduce the NO X concentration, rather than precise control. The processing in this stage mainly focuses on completing the main reaction task, that is, rapidly degrading nitrogen oxides.

[0048] When the flue gas is treated by the upstream reaction node, its temperature and NO X concentration will change. At the downstream reaction node, the flue gas enters a narrow temperature range, and at this time, a higher requirement for denitration precision exists. Therefore, the injection reactor will enter the fine adjustment stage to further optimize the NO X concentration in the flue gas. Within the narrow temperature range, the temperature change is small and the reaction precision requirement is higher. Therefore, the injection volume gradually decreases and fine tuning is carried out step by step. At this time, by fine tuning the injection volume, the NO X concentration is further reduced to achieve a more efficient denitration reaction. The coarse adjustment in the first stage mainly deals with a large NO X concentration, while the fine adjustment stage mainly conducts more precise treatment on the already reduced NO X concentration to ensure that the denitration effect reaches the optimal state.

[0049] Hot zone migration tracking refers to monitoring and tracking the position of the hot zone according to the flue gas flow and temperature change, so as to adjust the start-up and operation strategies of different reaction nodes. Hot zone migration tracking can ensure that the denitration reaction is always in the optimal temperature range when the flue gas passes through different reaction nodes. By real-time tracking of the hot zone, the temperature change of the flue gas in the pipeline is identified, and based on this change, it is decided whether to start the reaction of the downstream node. When the flue gas enters the downstream reaction node, if the hot zone temperature is appropriate, the fine adjustment treatment will continue; if the temperature deviates from the expectation, the injection volume will be readjusted or a new reaction node will be started.

[0050] The coarse adjustment treatment in the first stage with a wide temperature range can rapidly reduce the NO X concentration in the flue gas. The fine adjustment treatment in the second stage can further optimize the denitration effect within the narrow temperature range to ensure that the NO X concentration reaches the ultra-low emission standard. The hot zone migration tracking mechanism can monitor the temperature and NO X concentration of the flue gas in real time and flexibly adjust the reaction process, thereby improving the stability and response speed of the entire denitration system.

[0051] Furthermore, S300 of this application includes: Determining the first reaction completeness based on the initial NO X concentration of the flue gas, wherein the reaction completeness is related to NO XThere is a negative correlation with the concentration; according to the first reaction completion degree, determine the first linear relationship, where the temperature and the injection amount are negatively correlated, and the slope of the first linear relationship is positively correlated with the first reaction completion degree; according to the first linear relationship, deploy the coarse-tuning cascade outer loop.

[0052] Specifically, the initial NO X concentration is the concentration of nitrogen oxides in the flue gas discharged from the boiler without denitrification treatment. According to the working state of the boiler and different components of the flue gas, the NO X concentration will vary. Therefore, the reaction completion degree is not fixed at 0, but is dynamically adjusted by detecting the NO X concentration. When the initial NO X concentration is high, the reaction completion degree will be correspondingly low, and vice versa, the reaction completion degree will be high. For example, assume that the NO X concentration in the flue gas is 1000 ppm. Through experiments and historical data, determine the corresponding reaction completion degree to be 40%; if the NO X concentration of the flue gas drops to 500 ppm, the corresponding reaction completion degree may be 70%. The reaction completion degree refers to the progress degree of the NO X removal reaction under specific reaction conditions. The reaction completion degree is an index measuring the efficiency of the denitrification process and is usually expressed as a percentage. The reaction completion degree is negatively correlated with the NO X concentration, meaning that as the NO X concentration decreases, the reaction completion degree increases.

[0053] According to the first reaction completion degree, determine the first linear relationship between the temperature and the injection amount. As the flue gas temperature changes, the adjustment requirement of the injection amount will also change. Generally speaking, the higher the temperature, the higher the efficiency of the denitrification reaction, so the amount of injection agent needs to be reduced, while when the temperature is low, the injection amount needs to be increased. For example, assume that the first reaction completion degree is 60%. Under this reaction completion degree, the relationship between the temperature and the injection amount is: injection amount = - temperature × slope + intercept, where the slope is positively correlated with the reaction completion degree, meaning that the higher the reaction completion degree, the greater the change range of the injection amount. Conversely, when the reaction completion degree is low, the change in the injection amount is small. For example, if the reaction completion degree is 40%, then for every 10 °C increase in temperature, the injection amount may decrease by 5%; if the reaction completion degree is 80%, then for every 10 °C increase in temperature, the reduction range of the injection amount may increase to 8%.

[0054] According to the first linear relationship, determine the adjustment rule between the injection amount and the temperature, and deploy the coarse-tuning cascade outer loop. The coarse-tuning cascade outer loop is mainly responsible for NO XThe concentration is initially adjusted to achieve the expected denitration effect. The coarse-tuning cascade outer loop is a control link, mainly responsible for the initial adjustment of the denitration process within a large temperature range. By adjusting the first reaction completion degree, the injection amount of the injection reactor is flexibly controlled to ensure that the denitration process can operate efficiently under different temperature conditions. In the initial stage, a large injection amount is used to quickly reduce the NO X concentration. When the reaction completion degree is high, the injection amount is finely adjusted according to the temperature change. By dynamically adjusting the reaction completion degree based on the initial NO X concentration in the flue gas, the adaptability of the reaction completion degree under different working conditions is ensured, so as to achieve a more accurate denitration effect.

[0055] Furthermore, the present application further includes the following steps: According to the first linear relationship, perform window temperature range matching on the annular reaction window to determine the window injection amount, where the window injection amount corresponds one-to-one with the annular reaction window; according to the window injection amount, perform step injection amount transition processing on the neighborhood window boundary to determine the gradient injection amount; based on the gradient injection amount as a reference, construct a coarse-tuning cascade inner loop; cascade the coarse-tuning cascade outer loop and the coarse-tuning cascade inner loop to determine the first gradient strategy of the two-step gradient scale decision.

[0056] Specifically, according to the first linear relationship, perform window temperature range matching on the annular reaction window, that is, match the temperature distribution within the annular reaction window with the injection amount to determine the window injection amount corresponding to each annular reaction window. The temperature change within the annular reaction window will directly affect the adjustment of the injection amount, ensuring that the injection amount matches the temperature conditions, so as to achieve an optimized denitration effect. According to the window injection amount, perform step injection amount transition processing on the neighborhood window boundary to determine the gradient injection amount. On the adjacent temperature range or reaction window boundary, the injection amount may change greatly, which will lead to the instability of the denitration effect. Therefore, it is necessary to perform step injection amount transition processing, that is, to adjust the injection amount through a smooth transition function to make the change of the injection amount smoother. For example, assume that when the temperature changes from 750°C to 800°C, the injection amount suddenly changes from 15% to 10%, and this change is too large. It is processed through a transition algorithm (such as linear interpolation or smoothing function) to ensure the smoothness of the injection amount change, and the injection amount is gradually reduced to 12% between 750°C and 800°C.

[0057] The step injection amount transition at the neighborhood window boundary refers to the smooth transition of the injection amount on the adjacent temperature range or reaction window boundary, avoiding too abrupt changes in the injection amount to achieve a more stable and accurate denitration effect. The gradient injection amount refers to a series of injection amount adjustment mechanisms that adjust the injection amount according to a certain gradient rule, considering the temperature gradient change from upstream to downstream and adjusting the injection amount based on this gradient.

[0058] According to the gradient injection amount after the step injection amount transition, further adjust the injection amount of the reactor to ensure the smooth progress of the denitration reaction, and construct a coarse-tuning cascade inner loop. This link mainly controls NO by adjusting the coarse-tuning stage of the injection amount. X For example, in a relatively large temperature range, the coarse-tuning link determines the large-range injection amount adjustment according to the temperature range. When the flue gas temperature is 450 °C, the injection amount may be set to 20%, and when the temperature rises to 550 °C, the injection amount may be reduced to 10%. The inner loop will perform preliminary injection amount control according to the result of this coarse-tuning.

[0059] Through the cascade outer loop and inner loop, combining the changes in temperature and injection amount, determine the first gradient strategy. The coarse-tuning inner loop and outer loop are respectively responsible for quickly adjusting the injection amount within a relatively large temperature change range. The outer loop is responsible for significantly adjusting the injection amount within a wide temperature range (i.e., a relatively large temperature interval), quickly responding to temperature changes, and quickly reducing the NO X concentration, playing a role of rough and rapid adjustment. Similar to the outer loop, the inner loop does not enter the fine-tuning stage, but quickly adjusts the injection amount within a relatively large temperature range. By matching appropriate injection amounts within different temperature ranges, the NO X concentration can be minimized to ensure complete reaction.

[0060] Furthermore, this application also includes the following steps: Determine the control parameter conversion relationship of the injection component, where the control parameter conversion relationship is the conversion relationship between the control requirement and the control parameter; according to the control parameter conversion relationship, convert the first gradient strategy, and control the injection equipment of the upstream reaction node according to the communication connection, where the injection equipment retrieves the denitration reactant from the storage area.

[0061] Specifically, determining the control parameter conversion relationship of the injection component is used to match the control requirement and the control parameter. The control requirement usually includes the reduction target of the NO X concentration, the requirement for reaction completeness, etc.; the control parameters include injection amount, injection pressure, reaction temperature, etc. The purpose of determining the control parameter conversion relationship is to calculate the required injection amount or reactant dosage according to the current NO X concentration, temperature and other conditions, so as to meet the denitration requirements. For example, if the target is to reduce the NO X concentration from 500 ppm to 150 ppm, calculate the required injection amount based on the control parameter conversion relationship. For example, when the NO X concentration is 500 ppm, 100 m³ / h of reactant needs to be injected, and when the NO X concentration drops to 150 ppm, the injection amount may be reduced to 50 m³ / h.

[0062] Through the control parameter conversion relationship, the control requirements are converted into actual injection volume requirements, thereby adjusting the working mode of the injection device. Based on the control parameter conversion relationship, the first gradient strategy will adjust the injection volume according to the linear relationship between temperature and injection volume. This means that the injection volume may be less at higher temperatures and more at lower temperatures. For example, in a reaction zone with a higher temperature (such as 800 °C), the injection volume is 60 m³ / h, while in a reaction zone with a lower temperature (such as 650 °C), the injection volume is 120 m³ / h.

[0063] Since the reaction zone consists of multiple nodes, each node is controlled through a communication connection. Determine the control requirements of the upstream reaction node (such as the target value of NO X concentration reduction), and then calculate the required injection volume according to the control parameter conversion relationship. The injection device of the upstream reaction node will, according to these requirements, retrieve an appropriate amount of denitration reagent from the storage area. The denitration reagent of the injection device is usually stored in a dedicated storage area (such as a reagent storage tank). According to the control instructions transmitted from the communication connection, the injection device will extract the required denitration reagent from the storage area and perform injection. According to the change in the injection volume, the extraction amount of the reagent will also change accordingly. By precisely controlling the injection volume, different NO X concentration targets are achieved in different reaction nodes, ensuring the optimization of the denitration effect in each reaction zone.

[0064] Furthermore, the present application further includes the following steps: For the annular reaction window, through hot zone migration tracking, according to the multi-level temperature values of the second division criterion, the window is adjusted to determine the adjusted reaction window; through NO X concentration detection, the second reaction completeness is determined; according to the second reaction completeness and the adjusted reaction window, a two-step gradient scale decision - injection control parameter conversion is performed, and the injection device of the downstream reaction node is controlled according to the communication connection.

[0065] Specifically, according to the temperature distribution in the flue gas pipeline, through hot zone migration tracking, the change in the flue gas temperature is monitored in real time. Since the temperature distribution of the flue gas may vary in the pipeline, the annular reaction window is refined and adjusted according to the multi-level temperature values of the second division criterion to ensure that the reagent injection can be carried out in the most suitable temperature range, thereby improving the reaction efficiency. For example, assume that the temperature of the flue gas is 650 °C when it enters the pipeline from the upstream, and it is more suitable to carry out the injection reaction at this temperature. However, as the flue gas flows, the temperature may gradually decrease to 550 °C. By adjusting the reaction window through hot zone migration tracking, ensure that the amount of injected reaction reagent can still maintain the best effect in the new temperature range.

[0066] When the injection reaction reagent enters the flue gas, NO XThe concentration will change. To quantify the denitrification effect, through NO X concentration detection, the NO X concentration after the reaction is monitored in real time, and the second reaction completion degree is calculated to measure the NO X removal effect after the reaction, usually expressed as the percentage of NO X concentration reduction. According to the second reaction completion degree and the adjusted annular reaction window, a two-step gradient scale decision is executed. Similar to the rough adjustment in the first stage, the second stage also follows the gradient injection mode, but its focus is on further optimizing the reaction effect. At this time, the adjustment of the injection volume will adopt a more refined control strategy according to the target value of the second reaction completion degree.

[0067] During the two-step gradient decision process, the injection volume is adjusted according to the temperature change and the feedback of NO X concentration. In the first stage, the change of the injection volume is relatively rough, and the focus is on reducing NO X concentration; while in the second stage, the system will make fine adjustments to the injection volume to ensure that the reaction completion degree reaches the expected target. Through the injection parameter control conversion, the control requirements (such as the target value of NO X concentration) are 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 the reaction agent it injects.

[0068] That is to say, in the second stage, by monitoring the NO X concentration and calculating the second reaction completion degree, the effect of the first stage reaction is determined. Based on the adjusted reaction window (i.e., the temperature and NO X concentration changes tracked by the hot zone migration), refined injection volume control is carried out. By comparing with the reaction completion degree of the first stage, the two-step gradient scale decision of the second stage is executed, that is, based on the target value of the second reaction completion degree, the injection volume is precisely adjusted to ensure that the NO X concentration is further reduced. Based on the two-step gradient scale decision, the goal of the injection parameter control conversion is to reduce the NO X concentration to the target value according to the requirements of the second reaction completion degree. After determining the injection volume and injection parameters, these parameters are transmitted to the injection equipment of the downstream reaction node through the communication connection to ensure that the downstream node can adjust the injection volume and injection mode of the reaction agent in real time according to the latest control requirements.

[0069] By finely adjusting the injection volume, the NO X concentration is precisely controlled to ensure a more refined denitrification effect. Compared with the first stage, the accuracy requirement in the second stage is higher, and the injection volume adjustment is more meticulous to ensure the improvement of the reaction completion degree.

[0070] In summary, the biomass boiler denitration method based on flue gas temperature provided by this application has the following beneficial effects: By dividing the cross-section of the flue gas pipeline from the central area to the edge area, an annular reaction window is determined. Among them, based on the temperature variable as the division basis, the annular reaction window is dynamically updated; a gradient injection mode is introduced to deploy the injection reactor, and a cascade reaction area is deployed in the flue gas pipeline. Among them, the gradient injection mode takes the first-order window matching and the second-order window transition as the mode mechanism; for the upstream reaction nodes in the cascade reaction area, according to the annular reaction window, the injection reactor is triggered to execute a coarse-tuning cascade decision based on a wide temperature range, and it responds to the injection equipment for the first-stage denitration treatment. 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-tuning cascade fine-tuning in a narrow temperature range, and it responds to the injection equipment for the second-stage denitration treatment and export management. That is to say, a dynamic reaction window is divided based on the flue gas temperature to achieve regionalized precise treatment; a gradient injection mode is introduced, and a gradient strategy is constructed based on the temperature-injection volume relationship to optimize the denitration agent injection and improve the reaction efficiency; hierarchical denitration control is adopted, the upstream wide temperature range is coarsely adjusted to quickly reduce the nitrogen oxide concentration, the downstream narrow temperature range is finely adjusted for further optimization, and flexible adjustment is combined with hot zone tracking to ensure that the denitration efficiency reaches the optimum in different temperature ranges and comprehensively improve the denitration efficiency.

[0071] Example 2. Based on the same inventive concept as the biomass boiler denitration method based on flue gas temperature in the foregoing Example 1, this application also provides a biomass boiler denitration system based on flue gas temperature. Please refer to the attached Figure 2 , The biomass boiler denitration system based on flue gas temperature includes: A cross-section division module 11, which is used to divide the cross-section of the flue gas pipeline from the central area to the edge area to determine an annular reaction window. Among them, based on the temperature variable as the division basis, the annular reaction window is dynamically updated; a reactor deployment module 12, which is used to introduce a gradient injection mode to deploy the injection reactor and deploy a cascade reaction area in the flue gas pipeline. Among them, the gradient injection mode takes the first-order window matching and the second-order window transition as the mode mechanism; a denitration treatment module 13, which is used to trigger the injection reactor to execute a coarse-tuning cascade decision based on a wide temperature range for the upstream reaction nodes in the cascade reaction area, and respond to the injection equipment for the first-stage denitration treatment. 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-tuning cascade fine-tuning in a narrow temperature range, and respond to the injection equipment for the second-stage denitration treatment and export management.

[0072] Furthermore, the cross-section division module 11 in the biomass boiler denitration system based on flue gas temperature is also used for: Divide multi-level temperature values, where the multi-level temperature values include a first division criterion based on a wide temperature range and a second division criterion based on a narrow temperature range; as the flue gas enters the pipeline, trigger thermal imaging temperature measurement to determine the cross-sectional temperature map; use the cross-sectional temperature map to perform annular window sub-region division of the multi-level temperature values based on the first division criterion to determine the annular reaction window.

[0073] Further, the reactor deployment module 12 in the biomass boiler denitration system based on flue gas temperature is further configured to: According to the gradient injection mode, taking the linear relationship between temperature and injection amount determined based on the reaction completeness constrained by NO X concentration as a benchmark, taking the two-step gradient scale decision-injection parameter control conversion as the decision target, supervising and training the injection reactor; establishing a communication connection between the injection reactor and the injection equipment deployed inside the cascade reaction zone.

[0074] Further, the reactor deployment module 12 in the biomass boiler denitration system based on flue gas temperature is further configured to: The cascade reaction zone includes at least two reaction nodes; perform selective denitration triggering of the cascade reaction zone according to the reaction completeness.

[0075] Further, the denitration treatment module 13 in the biomass boiler denitration system based on flue gas temperature is further configured to: Taking the initial NO X concentration in the flue gas to determine the first reaction completeness, where the reaction completeness is negatively correlated with the NO X concentration; according to the first reaction completeness, determine the first linear relationship, where the temperature and the injection amount are negatively correlated, and the slope of the first linear relationship is positively correlated with the first reaction completeness; deploy a coarse-tuning cascade outer loop according to the first linear relationship.

[0076] Further, the denitration treatment module 13 in the biomass boiler denitration system based on flue gas temperature is further configured to: According to the first linear relationship, perform window temperature range matching on the annular reaction window to determine the window injection amount, where the window injection amount corresponds one-to-one with the annular reaction window; according to the window injection amount, perform step injection amount transition processing on the neighborhood window boundary to determine the gradient injection amount; construct a coarse-tuning cascade inner loop based on the gradient injection amount; cascade the coarse-tuning cascade outer loop and the coarse-tuning cascade inner loop to determine the first gradient strategy of the two-step gradient scale decision.

[0077] Further, the denitration treatment module 13 in the biomass boiler denitration system based on flue gas temperature is further configured to: Determine the parameter control conversion relationship of the injection component, where the parameter control conversion relationship is the conversion relationship between control requirements and control parameters; according to the parameter control conversion relationship, convert the first gradient strategy, and control the injection device of the upstream reaction node according to the communication connection, where the injection device retrieves the denitration reactant from the storage area.

[0078] Further, the denitration processing module 13 in the biomass boiler denitration system based on flue gas temperature is further configured to: For the annular reaction window, by performing hot zone migration tracking, according to the multi-level temperature values of the second division criterion, perform window adjustment to determine the adjusted reaction window; determine the second reaction completeness through NO X concentration detection; according to the second reaction completeness and the adjusted reaction window, perform two-step gradient scale decision-making - injection parameter control conversion, and control the injection device of the downstream reaction node according to the communication connection.

[0079] The various embodiments in this specification are described in a progressive manner. The key point of each embodiment is the difference from other embodiments. The Figure 1 biomass boiler denitration method and specific examples in the first embodiment are equally applicable to the biomass boiler denitration system based on flue gas temperature in this embodiment. Through the detailed description of the biomass boiler denitration method based on flue gas temperature above, those skilled in the art can clearly know the biomass boiler denitration system based on flue gas temperature in this embodiment. Therefore, for the sake of simplicity of the specification, it will not be elaborated here.

[0080] Embodiment 3, based on the same inventive concept as the biomass boiler denitration method based on flue gas temperature in the first embodiment above, the present application further provides an electronic device, including: 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 to enable the at least one processor to execute the steps of any one of the biomass boiler denitration methods based on flue gas temperature described in the first embodiment above.

[0081] Appendix Figure 3 is a schematic structural diagram of an exemplary electronic device of the present application. In Figure 3Among them, the bus architecture is represented by bus 300. Bus 300 may include any number of interconnected buses and bridges. Bus 300 connects various circuits of one or more processors represented by processor 302 and memory represented by memory 304 together. Bus 300 may also connect various other circuits together, such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art. Therefore, they will not be further described herein. Bus interface 305 provides an interface between bus 300 and receiver 301 and transmitter 303. Receiver 301 and transmitter 303 may be the same element, i.e., a transceiver, providing a unit for communicating with various other devices on the transmission medium. Processor 302 is responsible for managing bus 300 and general processing, while memory 304 may be used to store data used by processor 302 when performing operations.

[0082] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

[0083] Obviously, for those skilled in the art, without departing from the principles of the present application, several improvements and modifications can also be made to the present application, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. A method for denitrification of biomass boilers based on flue gas temperature, characterized in that Including: Conduct cross-section division of the flue gas pipeline from the central area to the edge area to determine an annular reaction window. Among them, based on the temperature variable as the division basis, the annular reaction window is dynamically updated. Introduce a gradient injection mode to deploy an injection reactor, and deploy a cascade reaction zone in the flue gas pipeline. Among them, the gradient injection mode is based on the first-order window matching and second-order window transition as the mode mechanism. For the upstream reaction nodes in the cascade reaction zone, according to the annular reaction window, trigger the injection reactor to execute a coarse-tuning cascade decision based on a wide temperature range, respond to the injection equipment for the first-stage denitrification treatment, and through tracking the hot zone migration from the upstream reaction node to the downstream reaction node, trigger the injection reactor to execute a fine-tuning cascade fine-tuning in a narrow temperature range, respond to the injection equipment for the second-stage denitrification treatment and export management.

2. The biomass boiler denitration method based on flue gas temperature according to claim 1, wherein The determination of the annular reaction window includes: Divide multiple levels of temperature values, where the multiple levels of temperature values include a first division criterion based on a wide temperature range and a second division criterion based on a narrow temperature range. As the flue gas enters the pipeline, trigger thermal imaging temperature measurement to determine the cross-section temperature map. Based on the cross-section temperature map, perform annular window sub-division of the multiple levels of temperature values based on the first division criterion to determine the annular reaction window.

3. The biomass boiler denitration method based on flue gas temperature according to claim 1, characterized in that, Introduce a gradient injection mode to deploy an injection reactor, including: According to the gradient injection mode, based on the linear relationship between temperature and injection volume determined by the reaction completeness constrained by the NO X concentration, with the two-step gradient scale decision-injection parameter control conversion as the decision target, supervise and train the injection reactor; Establish a communication connection between the injection reactor and the injection equipment deployed inside the cascade reaction zone.

4. The biomass boiler denitration method based on flue gas temperature according to claim 3, wherein, Trigger the injection reactor to execute a coarse-tuning cascade decision based on a wide temperature range, including: Based on the initial NO concentration in the flue gas X concentration, determine the first reaction completion degree, where the reaction completion degree is negatively correlated with the NO X concentration; According to the first reaction completeness, determine a first linear relationship, where the temperature and the injection amount are negatively correlated, and the slope of the first linear relationship is positively correlated with the first reaction completeness. According to the first linear relationship, deploy a coarse-tuning cascade outer loop.

5. The biomass boiler denitration method based on flue gas temperature according to claim 4, wherein After deploying the coarse-tuning cascade outer loop, including: According to the first linear relationship, perform window temperature range matching on the annular reaction window to determine the window injection amount, where the window injection amount corresponds one-to-one with the annular reaction window. According to the window injection amount, perform a step injection amount transition treatment on the neighborhood window boundary to determine the gradient injection amount. Based on the gradient injection amount as a benchmark, construct a coarse-tuning cascade inner loop. Cascade the coarse-tuning cascade outer loop and the coarse-tuning cascade inner loop to determine the first gradient strategy of the two-step gradient scale decision.

6. The biomass boiler denitration method based on flue gas temperature according to claim 5, characterized in that, After determining the first gradient strategy of the two-step gradient scale decision, including: Determine the parameter control conversion relationship of the injection component, where the parameter control conversion relationship is the conversion relationship between the control requirement and the control parameter. According to the parameter control conversion relationship, convert the first gradient strategy, and according to the communication connection, control the injection equipment of the upstream reaction node, where the injection equipment retrieves the denitrification reactant from the storage area.

7. The method for denitrification of biomass boilers based on flue gas temperature according to claim 2, wherein Through tracking the hot zone migration from the upstream reaction node to the downstream reaction node, trigger the injection reactor to execute a fine-tuning cascade fine-tuning in a narrow temperature range, including: For the annular reaction window, through tracking the hot zone migration, according to the multiple levels of temperature values of the second division criterion, perform window adjustment to determine the adjusted reaction window. Determine the second reaction completion degree by NO X concentration detection; Based on the second reaction completion degree and the adjusted reaction window, perform two-step gradient scale decision-jet parameter control conversion, and control the jet device of the downstream reaction node according to the communication connection.

8. The method for denitrifying a biomass boiler based on flue gas temperature according to claim 1, wherein The cascade reaction zone includes at least two reaction nodes; Based on the reaction completion degree, trigger the selective denitration of the cascade reaction zone.

9. A biomass boiler denitration system based on flue gas temperature, characterized in that, For implementing the steps of the biomass boiler denitration method based on flue gas temperature according to any one of claims 1 to 8, the biomass boiler denitration system based on flue gas temperature includes: A cross-section division module for performing cross-section division of the flue gas pipeline 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 as the division basis; A reactor deployment module for introducing a gradient injection mode to deploy an injection reactor and deploy a cascade reaction zone in the flue gas pipeline, wherein the gradient injection mode is based on the first-order window matching and the second-order window transition as the mode mechanism; A denitration treatment module for, for the upstream reaction node in the cascade reaction zone, according to the annular reaction window, trigger the injection reactor to execute a coarse-tuning cascade decision based on a wide temperature range, respond to the injection device for the first-stage denitration treatment, and by tracking the hot zone migration from the upstream reaction node to the downstream reaction node, trigger the injection reactor to execute a fine-tuning cascade fine-tuning in a narrow temperature range, and respond to the injection device for the second-stage denitration treatment and export management.

10. An electronic device, characterized in that, 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 denitration method based on flue gas temperature according to any one of claims 1 to 8.

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