A circulating fluidized bed boiler SO2 and NO driven by digitalization X Synergistic removal control method

Abstract

The application relates to a digital and intelligent driving circulating fluidized bed boiler SO2 and NO X The application relates to a synergistic removal control method, and belongs to the technical fields of energy science and technology and atmospheric pollution control technology. The application establishes a multi-region multi-parameter monitoring system, constructs a multi-parameter database and a SO2 / NO X emission concentration synergistic control model, develops a SO2 / NO X emission concentration synergistic control technology, and forms a circulating fluidized bed boiler low SO2 / NO X emission concentration optimization operation method, effectively solves the problems of simultaneously controlling SO2, NO X emission concentration in a circulating fluidized bed boiler hearth, realizes double-low emission of SO2, NO X concentration at a hearth outlet.

Description

Technical Field

[0001] This invention relates to the fields of energy science and technology and air pollution control technology, and particularly to a digitally driven circulating fluidized bed boiler for SO2 and NO control. X Synergistic removal control method. Background Technology

[0002] Circulating fluidized bed (CFB) boilers represent the most industrialized clean and efficient coal utilization technology, boasting advantages such as wide fuel applicability, high combustion efficiency, low atmospheric pollutant emission concentrations, and a wide load adjustment range. However, with increasingly stringent national environmental policies, the challenges of reducing raw sulfur dioxide and nitrogen oxide emissions from CFB boilers and achieving ultra-low emissions of sulfur dioxide and nitrogen oxides within the boiler furnace are growing.

[0003] The method for controlling sulfur oxide emissions in circulating fluidized bed (CFB) boilers is to achieve in-furnace desulfurization by adding a desulfurizing agent to the combustion chamber. The method for controlling nitrogen oxide emissions in CFB boilers is to employ staged combustion, that is, to control nitrogen oxide formation by adjusting the reducing and oxidizing atmospheres within the combustion chamber. The reducing atmosphere in the dense phase zone of the furnace is beneficial for suppressing NO. X The oxidizing atmosphere in the dilute phase zone of the furnace is conducive to the conversion of nitrogen in coal to NO. X However, the low fuel concentration in the dilute phase region results in a small amount of nitrogen conversion in the coal, thus reducing nitrogen oxide emissions.

[0004] However, in actual operation of circulating fluidized bed boilers, traditional in-furnace desulfurization technology has a reverse effect on the inhibition of sulfur oxide and nitrogen oxide formation in the furnace. Traditional in-furnace desulfurization technology only delivers desulfurizing agent to the dense phase zone of the furnace. When increasing the desulfurizing agent feed rate to improve desulfurization efficiency and reduce SO2 emission concentration, the desulfurizing agent converts nitrogen in the coal into NO. X The conversion rate has a catalytic effect, leading to NO... X Increased emission concentrations. When using staged combustion technology to enhance the inhibition of nitrogen oxide formation, such as reducing the excess air coefficient, nitrogen oxide emission concentrations decrease. However, insufficient oxygen supply in the furnace inhibits the conversion of sulfur in coal to SO2, making it difficult for the desulfurizing agent to bind with and fix SO2, ultimately leading to increased SO2 emission concentrations. Simultaneously, the conversion of sulfur in coal to SO2 is closely related to oxygen concentration. Sulfur particles that do not precipitate in the dense phase region continue to precipitate in the dilute phase region with higher oxygen concentrations. Since the desulfurizing agent is added in the dense phase region, its concentration is low in the dilute phase region, making it unable to completely fix the sulfur oxides precipitated there, resulting in limited desulfurization effectiveness. Therefore, to reduce NO in the flue gas of circulating fluidized bed boilers... X To meet increasingly stringent environmental protection requirements, SO2 and NO emission concentrations in circulating fluidized bed boilers need to be controlled. X Coordinated control. Summary of the Invention

[0005] The purpose of this invention is to overcome the aforementioned shortcomings in the prior art and to provide a digitally driven circulating fluidized bed boiler for SO2 and NO. X The synergistic removal control method can reduce SO2 and NO at the furnace outlet of circulating fluidized bed boilers. X Concentration provides technical insights for energy conservation and emission reduction in coal-fired power units.

[0006] The technical solution adopted by this invention to solve the above problems is: a digitally driven circulating fluidized bed boiler for SO2 and NO X The collaborative removal control method is characterized by: (1) developing a method for controlling SO2 / NO in circulating fluidized bed boilers. X (2) Collaborative control technology; (3) Establishing a multi-regional, multi-parameter monitoring system; (4) Constructing a multi-parameter database and SO2 / NO2 monitoring system. X (4) Based on the control model, a low SO2 / NO2 emission concentration control model is formed for circulating fluidized bed boilers. X Optimization of emission concentration operation methods.

[0007] Preferably, the SO2 / NO ratio in the circulating fluidized bed boiler is... X The scope of the collaborative control technology includes the combustion chamber, the dense phase zone of the furnace, the dilute phase zone of the furnace, the cyclone separator, the riser, the return feeder, the return leg, the primary air inlet, the lower secondary air inlet, the upper secondary air inlet, the coal conveying pipe, the desulfurizing agent silo, and the desulfurizing agent feeding point. The dense phase zone of the furnace is located in the lower part of the combustion chamber, and the dilute phase zone of the furnace is located in the upper part of the combustion chamber. The cyclone separator is connected to the furnace outlet by a flue, and the riser connects the lower end of the cyclone separator and the return feeder. The return feeder returns material... The leg is connected to the dense phase zone of the furnace. The coal conveying pipe is used to transport fuel to the furnace. The desulfurizing agent silo stores desulfurizing agent, which is generally limestone particles with a particle size of less than 2 mm. The desulfurizing agent feeding point is the point where desulfurizing agent is transported to the combustion chamber, including the desulfurizing agent dedicated feeding point, the coal conveying pipe feeding point, the lower secondary air feeding point, the return feeder feeding point, and the upper secondary air feeding point. The dedicated feeding point only transports desulfurizing agent and includes the dense phase zone feeding point and the dilute phase zone feeding point.

[0008] Preferably, the fuel is fed into the dense phase zone of the combustion chamber via a coal conveying pipe. The boiler air supply system supplies air to the combustion chamber for staged combustion. The air is supplied to the furnace in a primary and secondary air ratio, maintaining the excess air coefficient in the dense phase zone of the furnace at no higher than 0.97 and the boiler air coefficient in the dilute phase zone of the furnace at 1.0~1.3. Simultaneously, the temperature in the combustion chamber is controlled between 800℃ and 1000℃. With sufficient fuel and high oxygen consumption in the dense phase zone of the furnace, a reducing atmosphere with low oxygen content is formed, which is beneficial for suppressing SO2 / NO2 ratios. X The formation of a high-oxygen-content oxidizing atmosphere in the rarefaction zone of the furnace, with less fuel and lower oxygen consumption, is conducive to SO2 / NO2 ratio.X The desulfurizing agent is generated by converting nitrogen in coal into NO during the desulfurization process. X It has a strong catalytic effect, and adding desulfurizing agents is not conducive to NO. X To inhibit SO2 formation, the desulfurizing agent is transported from the desulfurizing agent silo to different feeding points via different pipelines to various areas, ultimately converging into the combustion chamber to fix the SO2 generated by coal combustion, achieving in-furnace desulfurization. Furthermore, because the desulfurizing agent is fed in a multi-point dispersed manner, the concentration of desulfurizing agent in the dense phase zone of the furnace is greatly reduced, significantly weakening the catalytic oxidation effect of the desulfurizing agent on nitrogen in the coal, thereby reducing NO2 production. X The above method achieves efficient SO2 / NO generation. X Collaborative control.

[0009] Preferably, the desulfurizing agent feeding method includes feeding it into the dense phase zone of the furnace through a dedicated feeding pipe, feeding it into the furnace through the coal feed port after mixing with the coal entering the furnace, feeding it into the dense phase zone with the secondary air arranged in the dense phase zone, feeding it into the dense phase zone with the solid particles returned from the return leg, and feeding it into the dilute phase zone with the upper secondary air. The dilute phase zone is fed in single or multiple layers at different heights. The number of each feeding point is no more than 1 per square meter, and the interval between each feeding point is no less than 0.5 meters. The desulfurizing agent feeding method in the dense phase zone and the dilute phase zone of the furnace can be one or more combinations. The specific combination method is designed in conjunction with the collaborative control model.

[0010] Preferably, the establishment of a multi-region, multi-parameter monitoring system includes an online monitoring system and an offline monitoring system. The online monitoring system includes installing online monitoring instruments at locations such as the combustion chamber, the dense phase zone of the furnace, the dilute phase zone of the furnace, the cyclone separator, the riser, the return feeder, the return leg, the primary air inlet, the lower secondary air inlet, the upper secondary air inlet, the coal conveying pipe, the desulfurizing agent silo, and the desulfurizing agent feeding point. The online monitoring indicators include, but are not limited to, temperature, pressure, oxygen concentration, primary air volume, secondary air volume, gas velocity, feed rate, SO2 concentration, and NO. X Concentration and other parameters are all included in the online monitoring system. At the same time, offline monitoring indicators include fuel test indicators and desulfurizer test indicators. Fuel test indicators include moisture, ash, volatile matter, calorific value, carbon, hydrogen, oxygen, nitrogen, sulfur, etc., while desulfurizer test indicators include calcium oxide, iron oxide, aluminum oxide, silicon oxide, loss on ignition, etc.

[0011] Preferably, the construction of the multi-parameter database and SO2 / NO X The emission concentration coordinated control model first establishes a multi-parameter database, incorporating all online and offline monitoring indicators into the historical multi-parameter database. Real-time data from online monitoring is stored in the multi-parameter database to enable its updates and iterations. Based on this database, data processing techniques are used to construct SO2 / NO... X The emission concentration coordinated control model includes the following functional relationships:

[0012] (1) SO2 generation:

[0013] (2) NO X Generation quantity:

[0014] (3) SO2 / NO X Control Model:

[0015] (4) Desulfurizer distribution coefficient:

[0016] In the formula: This refers to coal consumption. Heat loss due to incomplete combustion in boiler machinery. The sulfur content in coal, For in-furnace desulfurization efficiency, Oxygen concentration, The temperature inside the furnace. The pressure inside the furnace, For the sulfur conversion rate in coal, The nitrogen content in coal, The nitrogen content in the air, Total air volume The conversion rate of nitrogen in the air, Nitrogen conversion rate in coal This refers to the consumption of desulfurizing agent. This is the desulfurizer distribution coefficient. For primary air volume, This is secondary air volume. For the primary and secondary air ratio, For the duration of stay, SO2 / NOx concentration For the amount of desulfurizing agent delivered to each pipeline, is the feed rate, and i is the desulfurizer feed point number.

[0017] Preferably, the circulating fluidized bed boiler based on the control model has a low SO2 / NO content. X Optimization of emission concentration operation methods based on SO2 / NO at cyclone separator outlet X The concentration is the target value for monitoring. Combined with the collaborative control model (1)~(4), based on NO X The SO2 concentration is used to regulate the delivery ratio and feed rate of the desulfurizing agent. The primary and secondary air volumes and ratios are adjusted based on the oxygen concentration in the dense and dilute phase zones. Optimal operating parameters, such as fuel consumption, furnace temperature, and fuel residence time, are obtained through iterative model calculations. Based on these optimal parameters, the operating parameters of the circulating fluidized bed furnace are automatically adjusted to achieve a low SO2 / NO2 ratio. XOptimized operation of emission concentration.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. A digitally driven circulating fluidized bed boiler SO2 / NO2 control system was developed. X The collaborative removal control method and system effectively solves the problem of simultaneously controlling SO2 and NO in the furnace of a circulating fluidized bed boiler. X The challenge of emission concentrations, achieving SO2 and NO at the furnace outlet X Low concentration of emissions;

[0020] 2. A multi-zone graded feeding technology for desulfurizing agents was developed, which effectively improved the utilization rate of desulfurizing agents. By optimizing the calcium-to-sulfur ratio, the amount of desulfurizing agent used was reduced, and the impact on NO was minimized. X The catalytic effect generated further improves the combustion economy and environmental performance of the circulating fluidized bed boiler;

[0021] 3. A multi-regional, multi-parameter monitoring system and a multi-parameter database were established to achieve "one machine, one database," providing a data foundation for the "digitalization and intelligentization" of circulating fluidized bed boilers;

[0022] 4. SO2 / NO was constructed X A coordinated emission concentration control model is used to address the SO2 / NO2 ratio. X In-furnace coordinated control provides theoretical methods and technical basis;

[0023] 5. SO2 / NO based on digital intelligence technology X The emission concentration synergistic control model has led to the development of low SO2 / NO2 emission ratios in circulating fluidized bed boilers. X Optimization methods for emission concentration, SO2 / NO at furnace outlet X Low concentrations help reduce the denitrification and desulfurization output of downstream environmental protection facilities, thereby reducing SO2 and NO. X End-of-pipe treatment costs provide technical support for power generation companies to reduce costs and increase efficiency. Attached Figure Description

[0024] Figure 1 A schematic diagram of graded feeding of desulfurizing agent in a circulating fluidized bed boiler;

[0025] Figure 2 Schematic diagram of a multi-zone, multi-parameter monitoring system for a circulating fluidized bed boiler;

[0026] Figure 3 For database sources and SO2 / NO X Schematic diagram of the coordinated control model for emission concentration.

[0027] In the attached image:

[0028] 1. Combustion chamber; 2. Dense phase zone of furnace; 3. Dilute phase zone of furnace; 4. Cyclone separator; 5. Riser; 6. Return feeder; 7. Return leg; 8. Primary air inlet; 9. Lower secondary air inlet; 10. Upper secondary air inlet; 11. Coal conveying pipe; 12. Coal bunker for furnace feed; 13. Desulfurizing agent bunker; 14. Desulfurizing agent conveying pipe; 15. Cyclone separator outlet. Detailed Implementation

[0029] To better illustrate the present invention and facilitate understanding of its technical solutions, the present invention will be further described in detail below. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only, and the scope of protection of the present invention is defined by the claims.

[0030] The following describes a preferred embodiment of the present invention in conjunction with the accompanying drawings.

[0031] This invention provides a digitally driven circulating fluidized bed boiler SO2 / NO X The collaborative removal control method and system, taking a 300MW circulating fluidized bed boiler as an example, are implemented as follows:

[0032] 1. A 300MW circulating fluidized bed boiler that is capable of normal operation is preferred. The main parts involved in this invention include the combustion chamber, the dense phase zone of the furnace, the dilute phase zone of the furnace, the cyclone separator, the riser, the return feeder, the return leg, the primary air outlet, the lower secondary air outlet, the upper secondary air outlet, the coal conveying pipe, the desulfurizing agent silo, and the desulfurizing agent feeding point, etc.

[0033] 2. Establish a multi-zone graded feeding system for desulfurizing agent. The desulfurizing agent feeding points are the points that deliver desulfurizing agent to the combustion chamber, including dedicated desulfurizing agent feeding points, coal conveying pipe feeding points, lower secondary air feeding points, return feeder feeding points, and upper secondary air feeding points. Among them, the dedicated feeding points only deliver desulfurizing agent and include dense phase zone feeding points and dilute phase zone feeding points.

[0034] 3. Based on the above-mentioned circulating fluidized bed boiler and desulfurizer feeding system, establish a multi-area, multi-parameter monitoring system. The online monitoring system includes installing online monitoring instruments at the following locations: combustion chamber, dense phase zone of furnace, dilute phase zone of furnace, cyclone separator, riser, return feeder, return leg, primary air outlet, lower secondary air outlet, upper secondary air outlet, coal conveying pipe, desulfurizer silo, and desulfurizer feeding point. Make full use of the existing instruments and meters equipped with the boiler, and add new instruments to supplement the monitoring points if necessary. The offline monitoring system mainly includes the analysis of fuel, desulfurizer, ash, and slag.

[0035] 4. Based on the above multi-region, multi-parameter monitoring system, the following data are obtained: temperature, pressure, oxygen concentration, primary air volume, secondary air volume, gas velocity, feed rate, SO2 concentration, and NO. XConcentrations, moisture, ash, volatile matter, calorific value, carbon, hydrogen, oxygen, nitrogen, sulfur, etc. in coal; calcium oxide, iron oxide, aluminum oxide, silicon oxide, loss on ignition, etc. in desulfurizing agents; boiler operating parameters such as load rate, main steam flow rate, bed pressure, main steam temperature, bed temperature, fuel consumption, and total air volume are obtained using the DCS system of the circulating fluidized bed boiler.

[0036] 5. Construct a multi-parameter database based on the operational data obtained from the multi-region, multi-parameter monitoring system. The multi-parameter database is located on the engineering station in the main control room and can store a large amount of historical operational data.

[0037] 6. Based on a large amount of historical data, a coordinated control model for SO2 / NOx emission concentrations was constructed, including the following functional relationships:

[0038] (1) SO2 generation:

[0039] (2) NO X Generation quantity:

[0040] (3) SO2 / NO X Control Model:

[0041] (4) Desulfurizer distribution coefficient:

[0042] The aforementioned collaborative control model is embedded in the control module of the engineering workstation and connected to the boiler DCS. Based on the real-time transmitted input parameters, the model iteratively calculates the optimal operating parameters and then feeds them back to the boiler DCS system. The control system then automatically adjusts the operating parameters of the circulating fluidized bed boiler, thereby achieving low SO2 / NO2 ratios. X Optimized operation of emission concentration.

[0043] The circulating fluidized bed boiler described in this embodiment has 15 desulfurizer feeding points, with 1.5 feeding points per square meter and a 1-meter interval between them. The limestone particle size is 2mm. Under full load operation, by optimizing the primary and secondary air distribution ratio, the excess air coefficient in the dense phase zone of the furnace is 0.95, and the excess air coefficient in the dilute phase zone is 1.25. The furnace temperature is between 850℃ and 920℃, and the furnace pressure is between -200Pa and 100Pa. The desulfurizer feeding ratio is 20% to 30% in the dense phase zone, 10% to 15% in the dilute phase zone, 10% via the coal conveying pipe, 20% to 25% via the return leg, and 30% to 40% via the dedicated desulfurizer supply pipe. The sulfur content in the coal is approximately 1.05%, the nitrogen content is approximately 0.72%, and the coal consumption is approximately 146t / h. After operational optimization based on this invention, the NO at the furnace outlet is... XThe concentration of SO2 at the furnace outlet is approximately 87 mg / m3, and the SO2 concentration at the outlet is approximately 600 mg / m3. The NO concentration at the furnace outlet is... X The concentrations of sodium and SO2 decreased by approximately 37% and 23% respectively, demonstrating significant effects.

Claims

1. A digitally driven circulating fluidized bed boiler for SO2 and NO X The collaborative removal control method is characterized by, Includes the following steps: Developing SO2 / NO in circulating fluidized bed boilers X Collaborative control technology; Establish a multi-regional, multi-parameter monitoring system; Building a multi-parameter database and SO2 / NO X Emission concentration coordinated control model; Low SO2 / NO2 ratio in circulating fluidized bed boilers based on control models X Optimization of emission concentration operation methods.

2. A digitally driven circulating fluidized bed boiler for SO2 and NO according to claim 1 X The collaborative removal control method is characterized by: SO2 / NO in circulating fluidized bed boilers X The collaborative control technology involves the combustion chamber, the dense phase zone of the furnace, the dilute phase zone of the furnace, the cyclone separator, the riser, the return feeder, the return leg, the primary air inlet, the lower secondary air inlet, the upper secondary air inlet, the coal conveying pipe, the desulfurizing agent silo, and the desulfurizing agent feeding point. The dense phase zone of the furnace is located in the lower part of the combustion chamber, and the dilute phase zone of the furnace is located in the upper part of the combustion chamber. The cyclone separator is connected to the furnace outlet by a flue, and the riser connects the lower end of the cyclone separator and the return feeder. The return feeder is connected via a return... The feed leg is connected to the dense phase zone of the furnace. The coal conveying pipe is used to transport fuel to the furnace. The desulfurizing agent bin is used to store desulfurizing agent, which is generally limestone particles with a particle size of less than 2 mm. The desulfurizing agent feeding point is the point where desulfurizing agent is delivered to the combustion chamber, including the desulfurizing agent dedicated feeding point, the coal conveying pipe feeding point, the lower secondary air feeding point, the return feeder feeding point, and the upper secondary air feeding point. Among them, the desulfurizing agent dedicated feeding point includes the dense phase zone feeding point and the dilute phase zone feeding point.

3. A digitally driven circulating fluidized bed boiler for SO2 and NO according to claim 2 X The collaborative removal control method is characterized by: Fuel is fed into the dense phase zone of the combustion chamber via a coal conveying pipe. The boiler air supply system supplies air to the combustion chamber for staged combustion. The air is supplied to the furnace in a primary and secondary air ratio, maintaining the excess air coefficient in the dense phase zone of the furnace at no higher than 0.97, and the boiler air coefficient in the dilute phase zone of the furnace at 1.0~1.

3. Simultaneously, the temperature in the combustion chamber is controlled between 800℃ and 1000℃. With ample fuel and high oxygen consumption in the dense phase zone of the furnace, a reducing atmosphere with low oxygen content is formed, which is beneficial for suppressing SO2 / NO2 ratios. X The formation of a high-oxygen-content oxidizing atmosphere in the rarefaction zone of the furnace, with less fuel and lower oxygen consumption, is conducive to SO2 / NO2 ratio. X The desulfurizing agent is generated by converting nitrogen in coal into NO during the desulfurization process. X It has a strong catalytic effect, and adding desulfurizing agents is not conducive to NO. X To inhibit SO2 formation, the desulfurizing agent is transported from the desulfurizing agent silo to different feeding points via different pipelines to various areas, ultimately converging into the combustion chamber to fix the SO2 generated by coal combustion, achieving in-furnace desulfurization. Furthermore, because the desulfurizing agent is fed in a multi-point dispersed manner, the concentration of desulfurizing agent in the dense phase zone of the furnace is greatly reduced, significantly weakening the catalytic oxidation effect of the desulfurizing agent on nitrogen in the coal, thereby reducing NO2 production. X The above method achieves efficient SO2 / NO generation. X Collaborative control.

4. A digitally driven circulating fluidized bed boiler for SO2 and NO according to claim 3 X The collaborative removal control method is characterized by: The desulfurizing agent feeding methods include feeding it into the dense phase zone of the furnace through a dedicated feeding pipe, feeding it into the furnace through the coal feed port after mixing with the coal, feeding it into the dense phase zone with the secondary air arranged in the dense phase zone, feeding it into the dense phase zone with the solid particles returned from the return leg, feeding it into the dilute phase zone with the upper secondary air, feeding it into the dilute phase zone at different heights in the dilute phase zone in single or multiple layers, and setting the number of each feeding point to be no more than 1 per square meter, with an interval of no less than 0.5 meters between each feeding point. The desulfurizing agent feeding methods in the dense phase zone and the dilute phase zone of the furnace can be one or more combinations, and the specific combination method is designed in conjunction with the collaborative control model.

5. A digitally driven circulating fluidized bed boiler for SO2 and NO according to claim 4. X The collaborative removal control method is characterized by: The multi-area, multi-parameter monitoring system includes an online monitoring system and an offline monitoring system. The online monitoring system includes online monitoring instruments installed at locations such as the combustion chamber, the dense phase zone of the furnace, the dilute phase zone of the furnace, the cyclone separator, the riser, the return feeder, the return leg, the primary air inlet, the lower secondary air inlet, the upper secondary air inlet, the coal conveying pipe, the desulfurizing agent silo, and the desulfurizing agent feeding point. Online monitoring indicators include, but are not limited to, temperature, pressure, oxygen concentration, primary air volume, secondary air volume, gas velocity, feed rate, SO2 concentration, and NO. X Concentration and other parameters are all included in the online monitoring system. At the same time, offline monitoring indicators include fuel test indicators and desulfurizer test indicators. Fuel test indicators include moisture, ash, volatile matter, calorific value, carbon, hydrogen, oxygen, nitrogen, sulfur, etc., while desulfurizer test indicators include calcium oxide, iron oxide, aluminum oxide, silicon oxide, loss on ignition, etc.

6. A digitally driven circulating fluidized bed boiler for SO2 and NO according to claim 5 X The collaborative removal control method is characterized by: The construction of a multi-parameter database and SO2 / NO X The emission concentration coordinated control model first establishes a multi-parameter database. All online and offline monitoring indicators as described in claim 5 are included in the historical multi-parameter database. Real-time data from online monitoring is stored in the multi-parameter database to achieve database updates and iterations. Based on the multi-parameter database, data processing technology is used to construct an SO2 / NO... X The emission concentration coordinated control model includes the following functional relationships: SO2 generation: ; NO X Generation quantity: ; SO2 / NO X Control Model: ; Desulfurizer distribution coefficient: ; In the formula: This refers to coal consumption. Heat loss due to incomplete combustion in boiler machinery. The sulfur content in coal, For in-furnace desulfurization efficiency, Oxygen concentration, The temperature inside the furnace. The pressure inside the furnace, For the sulfur conversion rate in coal, The nitrogen content in coal, The nitrogen content in the air, Total air volume The conversion rate of nitrogen in the air, Nitrogen conversion rate in coal This refers to the consumption of desulfurizing agent. This is the desulfurizer distribution coefficient. For primary air volume, This is secondary air volume. For the primary and secondary air ratio, For the duration of stay, SO2 / NO X concentration, For the amount of desulfurizing agent delivered to each pipeline, is the feed rate, and i is the desulfurizer feed point number.

7. A digitally driven circulating fluidized bed boiler for SO2 and NO according to claim 6 X The collaborative removal control method is characterized by: The low SO2 / NO2 ratio of the circulating fluidized bed boiler based on the control model X Optimization of emission concentration based on NO at cyclone separator outlet X SO2 concentration is the target monitoring value. Based on the functional relationship of the collaborative control model, and according to NO... X The SO2 concentration is used to regulate the delivery ratio and feed rate of the desulfurizing agent. The primary and secondary air volumes and ratios are adjusted based on the oxygen concentration in the dense and dilute phase zones. Optimal operating parameters, such as fuel consumption, furnace temperature, and fuel residence time, are obtained through iterative model calculations. Based on these optimal parameters, the operating parameters of the circulating fluidized bed furnace are automatically adjusted to achieve a low SO2 / NO2 ratio. X Optimized operation of emission concentration.

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