Air preheater anti-blocking method for reducing NH3 escape and SO3 content

Abstract

The invention discloses an air preheater anti-blocking method for reducing NH3 escape and SO3 content, and relates to the field of air preheater anti-blocking. Comprising the steps of step-by-step soot blowing optimization, dynamic soot blowing parameter adjustment, ammonia escape precise control, coal type bin-divided blending, combustion parameter optimization control and wall temperature increase treatment. According to the invention, step-by-step soot blowing strengthens removal of ash on the surface of the catalyst and reduces the ammonia escape concentration through fixed-point retention and dynamic adjustment; the ammonia escape detection system monitors and adjusts the ammonia spraying amount in real time to ensure that the ammonia escape concentration is lower than 3 ppm, and generation of NH4HSO4 is reduced; the SO3 generation amount is reduced through coal type bin-dividing blending and combustion parameter optimization control, and the blocking risk is restrained from the source; in the wall temperature increasing treatment, the wall temperature is increased to 210 DEG C or above in a circulating air bin heating and single-side temperature increasing mode, and coagulated materials are promoted to be gasified and fall off. According to the method, the problem of blockage of the air preheater is effectively solved, and the operation efficiency and stability of a boiler system are improved.

Description

Technical Field

[0001] The invention relates to the field of air preheater anti-blocking, and in particular to an air preheater anti-blocking method for reducing NH3 escape and SO3 content. Background Art

[0002] The air preheater is an important equipment in the boiler system to recover flue gas waste heat and improve boiler efficiency. Its function is to increase the air temperature entering the boiler, reduce the exhaust temperature, and reduce energy waste through heat exchange between flue gas and air. In the use of high-sulfur coal and high-ash coal in coal-fired power plants, the blockage of the air preheater seriously affects the stable operation of the boiler system. The main reason for the blockage is the interaction of three factors: ammonia escape, SO3 generation and low wall temperature in the denitrification system, which causes sticky ash such as NH4HSO4 to adhere and accumulate on the air preheater elements, further increasing the flue gas side pressure difference, reducing boiler efficiency, and even threatening the safe operation of the unit. When dealing with this problem, traditional technologies often fail to fundamentally solve the problems of ammonia escape, SO3 content and low wall temperature. The blockage of the air preheater has become a major problem that plagues power plants.

[0003] The traditional soot blowing method is usually a continuous walking soot blowing gun, which has a short blowing time and uneven coverage, and cannot effectively remove the soot on the catalyst surface. In addition, the soot blowing parameters are fixed and cannot be dynamically adjusted according to the actual blockage of the catalyst, resulting in long-term soot accumulation on the catalyst surface, decreased activity, and increased ammonia escape rate. Excessive ammonia escape not only increases the generation of NH4HSO4, but also further aggravates the blockage problem of the air preheater.

[0004] Traditional coal-fired power plants have a relatively extensive control over the blending of coal types, lacking real-time monitoring and dynamic adjustment, resulting in large fluctuations in the sulfur content of coal entering the furnace, high SO2 emissions, and the generation of a large amount of SO3. In addition, the combustion parameters are not accurately controlled, and the operation of the coal mill is not optimized, which further exacerbates the generation of SO3. High-concentration SO3 combines with ammonia escape to form a large amount of NH4HSO4, which quickly deposits on the surface of the air preheater, causing the blockage to worsen.

[0005] Traditional technologies for wall temperature control mainly rely on the natural operation of the system and lack effective wall temperature control methods. Especially when running at low load, the wall temperature of the air preheater often cannot be maintained above the condensation temperature of NH4HSO4, resulting in rapid deposition of sticky ash. In addition, the existing preheating methods fail to increase the temperature of local areas and cannot effectively remove the condensed NH4HSO4, so the blockage problem still occurs repeatedly.

[0006] In summary, there is an urgent need for an air preheater anti-blocking method that reduces NH3 escape and SO3 content. Summary of the invention

[0007] The main purpose of the present invention is to provide an air preheater anti-blocking method for reducing NH3 escape and SO3 content, which can effectively solve the problems in the background technology.

[0008] To achieve the above objectives, the technical solutions adopted by the present invention are: step-by-step sootblowing optimization, dynamic sootblowing parameter adjustment, precise control of ammonia escape, coal type blending, combustion parameter optimization control, and wall temperature enhancement management.

[0009] Step S1, step-by-step sootblowing optimization: the walking mode of the denitration catalyst sootblowing gun is changed from continuous walking to step-by-step sootblowing, that is, the sootblowing gun walks for 20-30 seconds and then stays for 50-90 seconds, and the cycle is repeated until the surface of the denitration catalyst is fully covered.

[0010] Step S2: Dynamic sootblowing parameter adjustment: dynamically adjust the travel time and residence time of the sootblowing gun according to the catalyst pressure difference of the air preheater, the flue gas temperature and the degree of system blockage.

[0011] Step S3: Precise control of ammonia escape: The ammonia concentration at the denitrification outlet is monitored in real time by the ammonia escape detection system, and the monitoring data is transmitted to the control system, which automatically adjusts the ammonia injection amount.

[0012] Step S4: Coal type classification and blending: Dynamically classify and blend the coal entering the furnace to control the sulfur content of the coal entering the furnace.

[0013] Step S5: Combustion parameter optimization control: Reduce SO2 emissions by adjusting the coal mill combination and combustion parameters.

[0014] Step S6: wall temperature improvement: through circulating wind bin heating and single-side temperature increase operation, the wall temperature of the air preheater is made higher than the condensation temperature of NH4HSO4 and maintained above 210°C.

[0015] Furthermore, the coal type blending in different warehouses includes: Carry out real-time online monitoring of coal quality and dynamically adjust the blending ratio of high-sulfur coal to low-sulfur coal to control the average sulfur content of the coal entering the furnace between 3.5% and 4.0%.

[0016] Furthermore, the combustion parameter optimization control includes: By adjusting the combined operation mode of the coal mill, the coal powder fineness and combustion temperature are optimized, and the SO2 emissions at the boiler outlet are controlled.

[0017] Furthermore, the wall temperature increase treatment includes: The air preheater elements are preheated by the circulating wind bin heating system to make the wall temperature higher than the NH4HSO4 condensation temperature of 147℃-207℃, and the wall temperature is maintained above 210℃ in the single-side heating mode.

[0018] Furthermore, in the dynamic sootblowing parameter adjustment, the travel time and residence time of the sootblowing gun can be automatically and dynamically adjusted according to the catalyst pressure difference, the flue gas temperature and the blockage degree of the air preheater.

[0019] Furthermore, in the precise control of ammonia slip, the ammonia slip detection system includes an ammonia concentration sensor and a data feedback module. The data feedback module transmits real-time monitoring data to the ammonia injection control device to automatically adjust the ammonia injection amount and distribution.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The present invention changes the soot blowing mode of the denitration catalyst from the traditional continuous walking to the step-by-step soot blowing, combined with dynamic parameter adjustment, effectively solving the problems of uneven coverage and poor cleaning effect of the traditional soot blowing. The step-by-step soot blowing strengthens the cleaning by regular stops, removes the ash adhering to the surface of the catalyst, restores the activity of the catalyst, and reduces the ammonia escape rate. At the same time, combined with the real-time monitoring of ammonia escape data, the ammonia injection amount is dynamically adjusted to ensure that the ammonia escape concentration is stably controlled below 3ppm, thereby reducing the generation of NH4HSO4 from the root and effectively delaying the blockage of the air preheater.

[0021] The present invention realizes precise control of the sulfur content of coal entering the furnace and optimization of boiler combustion efficiency by implementing coal type compartment blending and combustion parameter optimization control. By dynamically adjusting the blending ratio of high-sulfur coal and low-sulfur coal, the average sulfur content of coal entering the furnace is controlled between 3.5% and 4.0%, reducing the amount of SO2 generated during boiler combustion, thereby reducing the generation of SO3. At the same time, by optimizing combustion parameters and coal mill operation, the stability and efficiency of the combustion process are improved, the generation of SO3 is effectively suppressed, the conditions for SO3 to combine with ammonia to form NH4HSO4 are reduced, and the risk of blockage of the air preheater is reduced.

[0022] The present invention effectively increases the wall temperature of the air preheater components through circulating air bin heating and unilateral temperature rise operation, ensuring that the wall temperature is always higher than the condensation temperature of NH4HSO4, and further increases the wall temperature to above 210°C during operation. This measure not only effectively prevents the liquid adhesion of NH4HSO4, but also promotes the gasification and shedding of condensed NH4HSO4, and cooperates with the soot blowing system to completely remove the sediment, significantly improving the blockage of the air preheater and ensuring the stable operation and long-term high efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a flow chart of the overall steps of the present invention; DETAILED DESCRIPTION

[0024] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and is not a limitation of the scope of protection, applicability or examples set forth in the claims. The functions and arrangements of the elements discussed can be changed without departing from the scope of protection of the contents of this specification. Various examples can omit, replace or add various processes or components as needed. For example, the described method can be performed in an order different from the described order, and various steps can be added, omitted or combined. In addition, the features described relative to some examples can also be combined in other examples.

[0025] As used herein, the term "including" and its variations represent open terms, meaning "including but not limited to". The term "based on" means "based at least in part on". The terms "one embodiment" and "an embodiment" mean "at least one embodiment". The term "another embodiment" means "at least one other embodiment". The terms "first", "second", etc. may refer to different or the same objects. Other definitions may be included below, whether explicit or implicit. Unless the context clearly indicates otherwise, the definition of a term is consistent throughout the specification.

[0026] Example See also Figure 1 , the present invention provides a technical solution: An air preheater anti-blocking method for reducing NH3 escape and SO3 content, step-by-step soot blowing optimization, dynamic soot blowing parameter adjustment, precise control of ammonia escape, coal type bin blending, combustion parameter optimization control, and wall temperature improvement management.

[0027] Step S1, step-by-step sootblowing optimization: the walking mode of the denitration catalyst sootblowing gun is changed from continuous walking to step-by-step sootblowing, that is, the sootblowing gun walks for 20-30 seconds and then stays for 50-90 seconds, and the cycle is repeated until the surface of the denitration catalyst is fully covered.

[0028] Step S2: Dynamic sootblowing parameter adjustment: dynamically adjust the travel time and residence time of the sootblowing gun according to the catalyst pressure difference of the air preheater, the flue gas temperature and the degree of system blockage.

[0029] Step S3: Precise control of ammonia escape: The ammonia concentration at the denitrification outlet is monitored in real time by the ammonia escape detection system, and the monitoring data is transmitted to the control system, which automatically adjusts the ammonia injection amount.

[0030] Step S4: Coal type classification and blending: Dynamically classify and blend the coal entering the furnace to control the sulfur content of the coal entering the furnace.

[0031] Step S5: Combustion parameter optimization control: Reduce SO2 emissions by adjusting the coal mill combination and combustion parameters.

[0032] Step S6: wall temperature improvement: through circulating wind bin heating and single-side temperature increase operation, the wall temperature of the air preheater is made higher than the condensation temperature of NH4HSO4 and maintained above 210°C.

[0033] In step S1, the sootblowing gun moves gradually along the catalyst surface area, and stops for 50-90 seconds for fixed-point blowing after every 20-30 seconds of walking to ensure that the ash adhering to the catalyst surface can be completely removed. The step-by-step sootblowing method effectively enhances the blowing effect, removes the long-term accumulated NH4HSO4 and ash, restores the activity of the catalyst, and significantly reduces the ammonia escape rate.

[0034] In step S2, the travel time and residence time of the sootblowing gun are dynamically adjusted according to the actual operating status of the air preheater, and sensors are used to monitor the catalyst pressure difference, flue gas temperature and system blockage degree in real time; when the system pressure difference increases and the flue gas temperature is abnormal, the control system automatically increases the residence time of the sootblowing gun; when the system pressure difference returns to normal, the travel time and residence time of the sootblowing gun are called back to the initial set values.

[0035] In step S3, an ammonia escape detection system is installed at the outlet of the denitrification system to monitor the ammonia concentration in the flue gas at the denitrification outlet in real time. The sensor collects ammonia concentration data and sends it to the control system; the control system automatically adjusts the ammonia injection amount and ammonia injection distribution of the ammonia injection device according to the real-time data to ensure that the ammonia escape concentration is controlled below 3ppm.

[0036] In step S4, by setting up a coal type bin system, the sulfur content of the coal entering the furnace is monitored in real time according to the coal quality detection device, and the blending ratio of high-sulfur coal and low-sulfur coal is dynamically adjusted to ensure that the average sulfur content of the coal entering the furnace is controlled between 3.5% and 4.0%.

[0037] In step S5, the coal pulverizer combined operation and combustion parameters of the boiler system are adjusted to optimize the coal powder fineness and combustion temperature, thereby reducing the SO2 emission at the boiler outlet.

[0038] In step S6, the air preheater element is preheated in advance by the circulating wind bin heating system to maintain the element wall temperature above the condensation temperature of NH4HSO4 of 147°C-207°C. During the operation of the system, for the area with severe local blockage, the single-side heating operation mode is adopted to further increase the wall temperature to above 210°C, so as to promote the gasification and shedding of the condensed NH4HSO4.

[0039] Furthermore, the coal type blending in different warehouses includes: Carry out real-time online monitoring of coal quality and dynamically adjust the blending ratio of high-sulfur coal to low-sulfur coal to control the average sulfur content of the coal entering the furnace between 3.5% and 4.0%.

[0040] 1) Real-time online monitoring of coal quality An online coal quality monitoring device is installed in the coal bunker or coal transportation system. The device includes: Sulfur content detection sensor: collects sulfur content data of coal entering the furnace in real time, accurate to 0.1%; Data transmission module: transmits the monitored coal quality data to the central control system; Control and analysis module: automatically calculates the average sulfur content of the coal entering the furnace based on the detection data and generates a blending adjustment plan.

[0041] 2) Dynamic warehouse mixing According to the coal quality test data, high-sulfur coal and low-sulfur coal are stored in a separate storage system; The control system dynamically adjusts the feed ratio of high-sulfur coal to low-sulfur coal according to the real-time coal quality analysis results through an automated coal feeder; The adjusted blending ratio ensures that the sulfur content of the coal entering the furnace is stably controlled between 3.5% and 4.0%, reducing the amount of SO2 generated during boiler combustion and indirectly inhibiting the formation of SO3.

[0042] 3) Optimization process of blending ratio Input data: obtain the current sulfur content of high-sulfur coal and low-sulfur coal through real-time monitoring devices; Analysis and calculation: The control system dynamically adjusts the blending ratio according to the set target sulfur content range; Output execution: Automatically control the inflow flow of high-sulfur coal and low-sulfur coal, and synchronously deliver them to the boiler through the compartment system.

[0043] Furthermore, the combustion parameter optimization control includes: By adjusting the combined operation mode of the coal mill, the coal powder fineness and combustion temperature are optimized, and the SO2 emissions at the boiler outlet are controlled.

[0044] The combined operation mode of multiple coal mills is adopted, and the coal powder fineness is stably controlled at R90=15%-20% through load balancing distribution and coal mill online regulation. The control system dynamically adjusts the operating conditions of each coal mill according to load demand and coal quality parameters to ensure the uniformity of coal powder and improve the combustion efficiency of coal powder.

[0045] The fineness of the coal powder is controlled within a reasonable range. Through adjustment of the coal mill, the fineness of the coal powder is controlled at R90=15%-20%, ensuring the stability and completeness of the combustion reaction and reducing the amount of unburned carbon and SO2 emissions.

[0046] Through precise control of air volume and air temperature, the furnace temperature is maintained between 850℃-950℃ to ensure sufficient combustion while suppressing the increase in SO2 concentration.

[0047] Monitor the SO2 content in the flue gas in real time, and dynamically adjust the combustion temperature and air supply according to data feedback to achieve a balance between combustion efficiency and emission control.

[0048] Furthermore, the wall temperature increase treatment includes: The air preheater elements are preheated by the circulating wind bin heating system to make the wall temperature higher than the NH4HSO4 condensation temperature of 147℃-207℃, and the wall temperature is maintained above 210℃ in the single-side heating mode.

[0049] Before the air preheater is operated, the preheater element is heated by the circulating wind chamber heating system, and the hot air in the boiler system is introduced into the circulating wind chamber and evenly distributed to the surface of the air preheater element through the air duct. The wall temperature of the air preheater element is gradually increased to 147℃-207℃, ensuring that the temperature is higher than the condensation temperature range of NH4HSO4 to avoid condensation and accumulation of sticky substances on the wall surface.

[0050] During the normal operation of the air preheater, the temperature of the local area is enhanced through the single-side heating mode. By adjusting the air volume and air temperature, the temperature control system is concentrated on the air preheater area with more serious blockage, and the element wall temperature is further increased to above 210℃. The increased wall temperature can promote the re-gasification and shedding of the condensed NH4HSO4, and the soot blowing system is used to remove the fallen substances.

[0051] Combined with the air preheater pressure difference, flue gas temperature and catalyst operating status monitored by the system in real time, the serious blockage area can be dynamically identified and the temperature can be enhanced in a targeted manner. The one-side heating mode can be achieved by adjusting the local air duct temperature.

[0052] Furthermore, in the dynamic sootblowing parameter adjustment, the travel time and residence time of the sootblowing gun can be automatically and dynamically adjusted according to the catalyst pressure difference, the flue gas temperature and the blockage degree of the air preheater.

[0053] Multiple sets of sensors and detection devices are deployed in the air preheater system. The pressure difference sensor monitors the flue gas pressure difference before and after the denitrification catalyst in real time to determine the blockage degree of the catalyst. The temperature sensor collects the flue gas temperature at the inlet and outlet of the air preheater to reflect the ash accumulation condition on the catalyst surface. Based on the pressure difference, temperature data and air preheater operation history data, the blockage area and blockage degree of the air preheater are automatically analyzed.

[0054] The control system automatically calculates the optimal travel time and residence time of the sootblowing gun based on the collected catalyst pressure difference, flue gas temperature and blockage degree data. When the catalyst pressure difference increases and the flue gas temperature decreases, the system identifies that the blockage is serious, and the residence time of the sootblowing gun is automatically increased, for example, from 50 seconds to 70-90 seconds, and the travel time is shortened to enhance cleaning. When the pressure difference decreases and the temperature returns to normal, the travel time of the sootblowing gun is adjusted back to 20-30 seconds, and the residence time is adjusted back to the initial setting value. The control system automatically completes the dynamic adjustment of the travel and residence time of the sootblowing gun through actuator instructions to ensure sootblowing efficiency and system stability.

[0055] The sootblowing system and the real-time monitoring system form a closed-loop feedback control. After sootblowing, the catalyst pressure difference change and flue gas temperature recovery are monitored. If the pressure difference and temperature do not meet the expected standards, the control system further optimizes the operating parameters of the sootblowing gun to enhance the sootblowing effect. When the system returns to normal, the control system automatically calls back the sootblowing gun parameters to reduce unnecessary residence time and ensure the sootblowing efficiency and energy saving effect of the system.

[0056] Furthermore, in the precise control of ammonia slip, the ammonia slip detection system includes an ammonia concentration sensor and a data feedback module. The data feedback module transmits real-time monitoring data to the ammonia injection control device to automatically adjust the ammonia injection amount and distribution.

[0057] An ammonia concentration sensor is installed at the outlet of the denitrification system to monitor the ammonia escape concentration in the flue gas after the denitrification reaction in real time. The ammonia concentration sensor uses a high-precision gas analyzer to sample and analyze the ammonia concentration in the flue gas in real time, with data accurate to the ppm level. The sensor is installed at a key position at the denitrification outlet to ensure the representativeness and accuracy of the collected data. The data collection frequency is once every 1-5 seconds to achieve real-time monitoring and feedback.

[0058] The ammonia concentration sensor transmits the detected real-time data to the data feedback module, which performs preliminary processing and analysis on the data. The ammonia escape concentration is compared with the set target value. The data analysis results are transmitted to the ammonia injection control device to form an automatic feedback adjustment instruction.

[0059] The ammonia spray control device receives the adjustment instructions transmitted by the data feedback module, and automatically adjusts the ammonia spray amount and distribution according to the actual ammonia escape concentration. When the ammonia escape concentration is higher than the target value, the control device appropriately reduces the ammonia spray amount to avoid excessive ammonia spraying and increasing ammonia escape. When the ammonia escape concentration is lower than the target value, the system appropriately increases the ammonia spray amount according to the denitration reaction requirements to ensure the denitration efficiency. By optimizing the ammonia spray distribution of the ammonia spray device, the ammonia gas is evenly distributed in the denitration reactor, reducing the local overspray and underspray phenomenon. The ammonia escape detection system, the data feedback module and the ammonia spray control device form a closed-loop control system. The system ensures that the ammonia escape concentration is always controlled below 3ppm through real-time monitoring, data feedback, and dynamic adjustment of ammonia spray. The control system can combine the temperature field and flow field distribution of the denitration reactor to further optimize the ammonia spray amount and distribution and improve the denitration efficiency.

[0060] Those skilled in the art should understand that the various embodiments disclosed above can be changed and modified in various ways without departing from the essence of the invention. Therefore, the protection scope of the present invention should be defined by the appended claims.

[0061] It should be noted that not all steps and units in the above processes are necessary, and some steps or units can be ignored according to actual needs. The execution order of each step is not fixed and can be determined as needed. The device structure described in the above embodiments can be a physical structure or a logical structure, that is, some units may be implemented by the same physical entity, or some units may be implemented by multiple physical entities, or some components in multiple independent devices may be implemented together.

[0062] The specific embodiments set forth above describe exemplary embodiments, but do not represent all embodiments that may be implemented or fall within the scope of protection of the claims. The term "exemplary" used throughout this specification means "used as an example, instance, or illustration" and does not mean "preferred" or "having advantages" over other embodiments. For the purpose of providing an understanding of the described techniques, the specific embodiments include specific details. However, these techniques may be implemented without these specific details. In some instances, in order to avoid obscuring the concepts of the described embodiments, well-known structures and devices are shown in block diagram form.

[0063] The above description of the present disclosure is provided to enable any person of ordinary skill in the art to implement or use the present disclosure. Various modifications to the present disclosure will be apparent to those of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of protection of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but is consistent with the widest range of principles and novel features disclosed herein.

Claims

1. A method for preventing air preheater from blocking by reducing NH3 escape and SO3 content, characterized by: The following steps are involved: Step-by-step soot blowing optimization, dynamic soot blowing parameter adjustment, precise control of ammonia escape, coal type blending, combustion parameter optimization control, and wall temperature improvement management; Step S1, step-by-step soot blowing optimization: the walking mode of the denitration catalyst soot blowing gun is changed from continuous walking to step-by-step soot blowing, that is, the soot blowing gun walks for 20-30 seconds and then stays for 50-90 seconds, and the cycle is repeated until the surface of the denitration catalyst is fully covered; Step S2: Dynamic sootblowing parameter adjustment: dynamically adjust the travel time and residence time of the sootblowing gun according to the catalyst pressure difference of the air preheater, the flue gas temperature and the system blockage degree; Step S3: Precise control of ammonia escape: The ammonia concentration at the denitrification outlet is monitored in real time by an ammonia escape detection system, and the monitoring data is transmitted to the control system, which automatically adjusts the amount of ammonia sprayed; Step S4: Coal type classification and blending: Dynamically classify and blend the coal entering the furnace to control the sulfur content of the coal entering the furnace; Step S5: Combustion parameter optimization control: reduce SO2 emissions by adjusting the coal mill combination and combustion parameters; Step S6: wall temperature improvement: through circulating wind bin heating and single-side temperature increase operation, the wall temperature of the air preheater is made higher than the condensation temperature of NH4HSO4 and maintained above 210°C.

2. The method for preventing air preheater from blocking according to claim 1, wherein: The coal type mixing includes: Carry out real-time online monitoring of coal quality and dynamically adjust the blending ratio of high-sulfur coal to low-sulfur coal to control the average sulfur content of the coal entering the furnace between 3.5% and 4.0%.

3. The method for preventing air preheater from blocking according to claim 1 for reducing NH3 escape and SO3 content is characterized by: The combustion parameter optimization control includes: By adjusting the combined operation mode of the coal mill, the coal powder fineness and combustion temperature are optimized, and the SO2 emissions at the boiler outlet are controlled.

4. The method for preventing air preheater from blocking according to claim 1 for reducing NH3 escape and SO3 content is characterized by: The wall temperature increase treatment includes: The air preheater elements are preheated by the circulating wind bin heating system to make the wall temperature higher than the NH4HSO4 condensation temperature of 147℃-207℃, and the wall temperature is maintained above 210℃ in the single-side heating mode.

5. The method for preventing air preheater from blocking according to claim 1 for reducing NH3 escape and SO3 content is characterized by: In the dynamic sootblowing parameter adjustment, the travel time and residence time of the sootblowing gun can be automatically and dynamically adjusted according to the catalyst pressure difference, the flue gas temperature and the blockage degree of the air preheater.

6. The method for preventing air preheater from blocking according to claim 1 for reducing NH3 escape and SO3 content is characterized by: In the precise control of ammonia escape, the ammonia escape detection system includes an ammonia concentration sensor and a data feedback module. The data feedback module transmits real-time monitoring data to the ammonia injection control device to automatically adjust the ammonia injection amount and distribution.

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