Method and system for preventing ultra-supercritical boiler cracking based on furnace wall temperature

Abstract

The application discloses a method and system for preventing ultra-supercritical boiler cracking based on furnace wall temperature, selects a boiler cracking risk position in advance, obtains a simulated temperature of the risk position by simulating a real-time temperature field distribution of the boiler through a preset model, acquires real-time measured temperatures of part of the risk positions and corrects the real-time temperature field distribution by using the real-time measured temperatures, and prewarns and controls the operation parameters of the boiler according to a temperature boundary threshold and the corrected simulated temperature. On the basis of an existing boiler temperature monitoring platform, the risk position wall temperature measuring points are added, the simulated boiler temperature distribution is corrected, the boiler operation temperature working condition can be more accurately monitored, the temperature boundary threshold is determined according to the thermal stress of the risk position, the critical state of the boiler cracking is prewarned, the operation parameters are controlled, the structure cracking leading to the ultra-supercritical boiler "four tube" leakage unplanned shutdown event is avoided, the non-shutdown event of the unit is effectively reduced, and the safety of the boiler operation is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of supercritical boiler cracking, and particularly relates to a method and system for preventing supercritical boiler cracking based on furnace wall temperature. BACKGROUND

[0002] Supercritical coal-fired power generation technology has a wide application in the thermal power industry, and it is an energy-saving and efficient power generation technology, which has a great advantage in thermal efficiency compared with conventional coal-fired power generation. However, due to the characteristics of high parameters and large capacity, supercritical coal-fired power generation technology puts forward higher requirements for the structural design of the boiler. Due to the complexity of the boiler thermal system, the frequent detours and alternations, and the large difference between the working conditions of different components, slight deviation in the process of boiler installation, operation adjustment and the like can easily cause structural cracking due to uncoordinated expansion, especially in the process of starting the unit whose thermal system is not balanced. According to the measured temperature, the deviation is normal several times or even higher. However, the boiler design only considers the normal operating state, and the safety margin is limited, so that the structure of the supercritical boiler cracks frequently. If the boiler structure crack is not treated in time, it will expand to the pressure-bearing system, causing the leakage of the "four tubes" of the boiler and the shutdown accident. According to statistics, the leakage of the "four tubes" of the boiler accounts for about 50% of the non-stop events of thermal power units, and the current leakage of the "four tubes" of the boiler is mainly caused by the structural cracking of the supercritical unit, accounting for about 40% of the leakage of the "four tubes" of the boiler. Therefore, how to prevent the structural cracking of the supercritical boiler is the main factor to reduce the leakage of the "four tubes" of the boiler and further reduce the non-stop of the thermal power unit.

[0003] The boiler system is complex and has a large structure, and the cost of modification is very high, and slight negligence may cause greater secondary consequences. Therefore, how to reduce the thermal difference between the associated components of the boiler to within the safety margin range of the design through appropriate operation in the process of starting the unit is the most economical and effective way to solve the structural cracking of the supercritical boiler. The current starting mode of the supercritical unit needs to be improved and optimized. SUMMARY

[0004] To solve the technical problems in the background art, the present application provides a method and system for preventing supercritical boiler cracking based on furnace wall temperature.

[0005] The method for preventing supercritical boiler cracking based on furnace wall temperature provided by the present application comprises the following steps:

[0006] The method for preventing supercritical boiler cracking based on furnace wall temperature provided by the present application comprises the following steps:

[0007] S1, presetting N boiler cracking risk positions, determining the temperature boundary threshold T of the risk position based on the stress level of the risk position N ;

[0008] S2, simulating the real-time temperature field distribution of the boiler based on the boiler operating parameters through a preset model to obtain the simulated temperature T of the N risk positions模 ;

[0009] S3. Obtain the real-time measured temperature t at M of the risk locations. 测 , using t 测 The simulated real-time temperature field distribution is corrected using a pre-set model to obtain the corrected simulated temperature T at N risk locations. 修 ;

[0010] S4. Based on the temperature boundary thresholds of N risk locations and the corrected simulated temperature, early warning and control of boiler operating parameters are performed.

[0011] Where M and N are both natural numbers, and M≤N.

[0012] Preferably, in S1, the temperature boundary threshold T for determining the risk location based on the stress level at the risk location is... N Specifically, the stress level at the risk location is obtained using finite element analysis, the maximum temperature deviation at the risk location is calculated based on the stress level, and the temperature boundary threshold is determined based on the maximum temperature deviation.

[0013] Preferably, the step of determining the maximum temperature deviation value T... 偏 Determine the temperature boundary threshold T 阈 Specifically: T 阈 =T 偏 -T 余 ;

[0014] Among them, T_remaining is the preset margin for early warning.

[0015] Preferably, the step of obtaining the stress level at the risk location using finite element calculation specifically involves using the finite element processing software Altair.Hypermesh to perform mesh generation analysis on the components associated with the risk location, and calculating the stress level at the risk location based on the analysis results.

[0016] Preferably, in S2, the step of simulating the real-time temperature field distribution of the boiler based on the boiler operating parameters using a preset model specifically involves: dividing the flue gas into multiple airflows along the width and depth of the flue, determining the airflow direction based on the pipe, and simulating the real-time temperature field distribution of N risk locations through step-by-step iteration.

[0017] Preferably, in S4, the step of performing early warning control on boiler operating parameters based on temperature boundary thresholds and corrected simulated temperatures at N risk locations specifically involves: firstly, determining whether the temperature at a risk location is abnormal based on the temperature boundary thresholds and corrected simulated temperatures at the risk locations, and then selecting early warning control parameters based on the risk locations with abnormal temperatures.

[0018] Preferably, in S1, the risk position specifically includes one or more of the following: horizontal flue wall joint, high-temperature component small-diameter weld, water-cooled wall lower header pipe seat fillet weld, tail flue package wall lower header pipe seat and fin fillet weld.

[0019] Preferably, the boiler operating parameter specifically includes at least one of the following: boiler fuel supply amount, boiler feed water flow, boiler boiler water circulating pump output, unit bypass opening degree.

[0020] Preferably, the horizontal flue joint temperature is monitored, and when the temperature difference on both sides of the joint wall exceeds the preset temperature boundary threshold, the opening degree of the boiler high-pressure bypass valve is increased.

[0021] In the present application, the method for preventing ultra-supercritical boiler cracking based on in-furnace wall temperature is proposed, the boiler cracking risk position is preselected, the real-time temperature field distribution of the boiler is simulated through a preset model, the simulated temperature of the risk position is obtained, the real-time measured temperature of part of the risk position is acquired and used to correct the simulated real-time temperature field distribution to obtain a corrected simulated temperature, and the boiler operating parameter is prewarned and regulated according to the temperature boundary threshold and the corrected simulated temperature. On the basis of the existing boiler temperature monitoring platform, the risk position wall temperature measuring point is added, and then the simulated boiler temperature distribution is corrected, so that the boiler operating temperature condition can be more accurately monitored, the temperature boundary threshold determined according to the thermal stress of the risk position is used to prewarn the critical state of the boiler cracking, and the operating parameter is used for regulation and control, so as to avoid the structure cracking leading to the "four pipe" leakage unplanned shutdown event of the ultra-supercritical boiler, effectively reduce the unit non-stop event, and provide protection for the safe operation of the boiler.

[0022] The present application also proposes a system for preventing ultra-supercritical boiler cracking based on in-furnace wall temperature, comprising a plurality of temperature sensors for acquiring the real-time measured temperature t 测 ;

[0023] a processor;

[0024] a memory; and

[0025] one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the processor, and the programs are used to execute the above-mentioned method for preventing ultra-supercritical boiler cracking based on in-furnace wall temperature.

[0026] In the present application, the system for preventing ultra-supercritical boiler cracking based on in-furnace wall temperature is proposed, and the technical effects are similar to the above-mentioned method, the equipment is less changed, no other harm is caused, and the operation is simple. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1A structural schematic diagram of a boiler in an embodiment of a method for preventing ultra-supercritical boiler cracking based on furnace inner wall temperature.

[0028] Figure 2 A temperature distribution schematic diagram of an ultra-supercritical boiler horizontal flue joint structure in an embodiment of a method for preventing ultra-supercritical boiler cracking based on furnace inner wall temperature.

[0029] Figure 3 For Figure 2 A stress temperature curve diagram of S11 position.

[0030] Figure 4 A flue wall pipe wall temperature and high bypass valve opening degree change curve diagram in an embodiment of a method for preventing ultra-supercritical boiler cracking based on furnace inner wall temperature.

[0031] Figure 5 A work flow diagram of an embodiment of a method for preventing ultra-supercritical boiler cracking based on furnace inner wall temperature. DETAILED DESCRIPTION

[0032] The embodiment provides a method for preventing ultra-supercritical boiler cracking based on furnace inner wall temperature, including the following steps:

[0033] S1, presetting N boiler cracking risk positions, determining a temperature boundary threshold T of the risk position based on a stress level of the risk position N .

[0034] In the selection of the risk position, all parts of the existing ultra-supercritical boiler structure that have ever cracked or have a higher thermal stress level can be collected. Taking a opposed burner ultra-supercritical boiler as an example, the horizontal flue wall joint, the high-temperature component small-diameter weld, the water wall lower header pipe seat fillet weld, the tail flue wall lower header pipe seat and fin fillet weld can be selected.

[0035] The stress level of the risk position is calculated by using a finite element, the maximum temperature deviation value of the risk position is calculated according to the stress level, and the temperature boundary threshold is determined according to the maximum temperature deviation value. N

[0036] In actual setting, considering the thermal inertia of the boiler, an advance amount is set for early warning control, and the temperature boundary threshold T 偏 is determined according to the maximum temperature deviation value T 阈 , specifically: T​阈 = T 偏 -T 余 ; wherein T is a preset margin of early warning.

[0037] S2, simulate the real-time temperature field distribution of the boiler based on the boiler operation parameters through a preset model to obtain the simulated temperature T of the N risk positions 模 ;

[0038] Specifically, the simulation of the real-time temperature field distribution of the boiler based on the boiler operation parameters through a preset model specifically includes: dividing the flue gas into multiple air flows along the width and depth directions of the flue, determining the air flow direction based on the pipeline, and simulating the real-time temperature field distribution of the N risk positions through step-by-step iteration.

[0039] S3, obtain the real-time measured temperature t of the M risk positions 测 , and utilize t 测 to correct the simulated real-time temperature field distribution through a preset model to obtain the corrected simulated temperature T of the N risk positions 修 ;

[0040] S4, perform early warning control on the boiler operation parameters based on the temperature boundary threshold and the corrected simulated temperature of the N risk positions;

[0041] wherein M and N are natural numbers, and M≤N.

[0042] Specifically, the early warning control on the boiler operation parameters based on the temperature boundary threshold and the corrected simulated temperature of the N risk positions specifically includes: first, judging whether the temperature of the risk position is abnormal according to the temperature boundary threshold and the corrected simulated temperature of the risk position, and selecting the early warning control parameter according to the risk position with abnormal temperature. The boiler operation parameters specifically include at least one of the following: the boiler fuel usage amount, the boiler feed water flow, the boiler boiler water circulating pump output, and the unit bypass opening degree.

[0043] According to the boiler thermal system, determine the subsystems that affect the temperature parameter changes of each component of the boiler during the unit startup process, such as: fuel usage of the combustion system, boiler feed water flow, boiler boiler water circulating pump output, unit high and low bypass valve opening degree, etc. During the unit startup process, when an alarm of easy-to-crack component temperature overrun occurs, according to the position where the alarm occurs, combined with the current actual operation of the boiler, adjust the component temperature by using one or more of the above methods to control the occurrence of temperature parameter overrun at each position and prevent the boiler structure from cracking. The above control methods include the overall heat input and output of the boiler, which may control the temperature rising speed; and the water and steam subsystem adjustment methods. By one or more combinations, the temperature deviation and temperature change rate of each component of the boiler can be adjusted. The adjustment means is reliable and effective.

[0044] The method for preventing ultra-supercritical boiler cracking based on the furnace wall temperature has the following beneficial effects:

[0045] 1. By running the operation mode, the structural cracking of the ultra-supercritical boiler is avoided to cause the "four tube" leakage of the ultra-supercritical boiler to avoid the non-planned shutdown event, the equipment is changed little, no other harm is caused, the operation is simple and easy to promote, the non-stop event of the unit is effectively reduced, and the economic benefit is remarkable.

[0046] 2. The wall temperature monitoring software platform of the ultra-supercritical unit furnace is applied, a small amount of wall temperature measuring points are added under the original condition, the real-time temperature parameters and development trend of each part and position of the boiler can be obtained more accurately, the temperature parameter working condition of the boiler during operation is effectively monitored, and the platform has strong practical value.

[0047] 3. The parts of the ultra-supercritical boiler which are prone to cracking are selected as the research object, the main problem is grasped, and the workload is reduced. Through the finite element analysis processing software, the temperature parameters of the limit of thermal stress of the position are analyzed, and the temperature parameters are used as the use boundary of the boiler equipment, so as to provide technical support for safe and reliable operation of the ultra-supercritical boiler.

[0048] Taking the ultra-supercritical boiler of the opposed burner as an example, the specific working principle of the method for preventing the ultra-supercritical boiler cracking based on the furnace wall temperature will be described in detail. When the temperature difference of the joint of the horizontal flue on both sides exceeds the preset temperature boundary threshold, the opening degree of the high-pressure bypass valve of the boiler can be increased.

[0049] Step 1:

[0050] In this embodiment, the structure of the ultra-supercritical unit boiler which is prone to cracking and has high thermal stress is collected, and the ultra-supercritical boiler of the opposed burner is taken as an example, such as the horizontal flue side wall joint, the high-temperature part auxiliary small-diameter pipe fillet weld, the water wall lower header pipe seat fillet weld, the tail flue package wall lower header pipe seat and fin fillet weld, and the like. Figure 1 As shown in the figure.

[0051] Step 2:

[0052] The wall temperature monitoring software platform of the ultra-supercritical unit furnace is based on the calculation principle, and the calculation method is described in CN112307650B. In actual operation, other calculation methods can also be used to realize temperature simulation and correction of the risk position.

[0053] In the secondary development of the wall temperature monitoring software platform using the calculation method of CN112307650B, the supercritical boiler easy-to-crack parts or the parts that may crack are selected for key calculation, and the real-time data of the wall temperature measuring points installed in the parts are combined to divide the flue gas into several streams along the width and depth directions of the flue, and the flue gas flow direction is divided by the pipes. The initial flue gas inlet and working fluid inlet of the pipe section are known, and the flue gas environment of the pipe section is also known, so that the entire heat transfer process is discretized into N heat transfer components. The outlet working fluid temperature of the previous pipe section is the inlet working fluid temperature of the next pipe section. According to the step-by-step iteration method, the real-time temperature parameter data of the easy-to-crack parts can be accurately simulated. According to the simulation calculation and big data analysis functions of the software platform, the development trend of the easy-to-crack part parameters is predicted. Based on the secondary development of the wall temperature measuring point software platform, more detailed and accurate temperature field distribution and temperature field change of the easy-to-crack part structure can be simulated in real time during the boiler startup stage.

[0054] Step 3:

[0055] In this embodiment, all parts that may crack or have high thermal stress levels in the existing supercritical boiler structure are collected. The above components and parts are analyzed by using the most professional finite element pre-processing software Altair.Hypermesh to divide the mesh of the component and accurately calculate the stress level of each part to determine the temperature parameter boundary of the easy-to-crack part.

[0056] Taking the horizontal flue joint as an example, the stress level distribution of the easy-to-crack part in the transverse direction can be obtained by numerical calculation, and the thermal stress level of the joint of the components on both sides of the horizontal flue is determined to be less than the maximum temperature difference value under the allowable stress of the material. According to the above calculated temperature deviation value as the temperature parameter boundary condition, the alarm value is set. Considering the thermal inertia of the boiler, there is an advance for operation mode adjustment, and the alarm value is set to be 5 degrees lower than the data parameter. During the boiler startup process, the software monitoring platform simulates the wall temperature monitoring data in real time, and when the temperature difference between the two components reaches the alarm value, the horizontal flue joint cracking wall temperature deviation alarm is sent in time. According to the temperature deviation exceeding position provided by the alarm, the operator adjusts the operation mode in time to reduce the parameter of the two components to below the alarm value to prevent the occurrence of over-limit.

[0057] As shown in Figure 2 and 3 , in the horizontal flue joint of the supercritical boiler, the Altair.Hypermesh finite element processing software is used to analyze the stress of the temperature difference change between the two components during the unit startup process. It is found that when the temperature difference between the two sides is 35℃, the stress peak value of the fin reaches the yield strength of the material, and there is a risk of cracking. Therefore, the temperature boundary threshold of this risk point is the temperature difference between the two sides of 35℃, and the alarm value is set to 30℃ according to the rules.

[0058] Step 4:

[0059] According to the operation mode of the boiler startup process, the temperature change of the boiler structure has an important influence. The boiler fuel supply mode (amount) provides heat for the operation of the boiler and raises the temperature. The boiler feed water flow absorbs the heat of the boiler and carries away the heat, which plays a role in temperature adjustment and cooling. The boiler water ring pump plays a role in adjusting the heat distribution of each part of the boiler water system, which is used for temperature adjustment and uniformization of the boiler water system. The opening size of the high and low bypass of the unit adjusts the heat transfer of the boiler and the external system of the boiler, which plays a role in temperature adjustment and distribution of the boiler water system and the steam system, and prevents the boiler from rising too fast. According to the position where the wall temperature data alarm value occurs, one or more of the four modes are adjusted for control.

[0060] As shown in the horizontal flue gap between the two wall temperature deviations exceeds the alarm value, since one side of the position is the boiler water system and the other side is the boiler steam system, by opening the high pressure bypass valve of the boiler, the heat transfer speed inside the boiler and the heat output to the outside are accelerated, and the deviation of the water and steam systems is balanced.

[0061] As shown in the horizontal flue gap between the two wall temperature deviations exceeds the alarm value, since one side of the position is the boiler water system and the other side is the boiler steam system, by opening the high pressure bypass valve of the boiler, the heat transfer speed inside the boiler and the heat output to the outside are accelerated, and the deviation of the water and steam systems is balanced. Figure 4 As shown in the horizontal flue gap between the two wall temperature deviations exceeds the alarm value, since one side of the position is the boiler water system and the other side is the boiler steam system, by opening the high pressure bypass valve of the boiler, the heat transfer speed inside the boiler and the heat output to the outside are accelerated, and the deviation of the water and steam systems is balanced.

[0062] In the present embodiment, the method and system for preventing ultra-supercritical boiler cracking based on the in-furnace wall temperature are proposed, a plurality of boiler cracking risk positions are selected, the temperature boundary threshold of the risk position is determined based on the stress level of the risk position, the real-time temperature field distribution of the boiler is simulated through a pre-set model to obtain the simulated temperature of the risk position, the real-time measured temperature of part of the risk positions is obtained and used to correct the simulated real-time temperature field distribution to obtain a corrected simulated temperature, and the boiler operating parameters are pre-warned and regulated according to the temperature boundary threshold and the corrected simulated temperature. On the basis of the existing boiler temperature monitoring software platform, the wall temperature measuring points of the risk positions are added, and then the simulated boiler temperature distribution is corrected, which can more accurately monitor the operating temperature condition of the boiler, pre-warn the critical state of the boiler cracking based on the temperature boundary threshold determined according to the thermal stress of the risk position, and regulate the operating parameters, thereby avoiding the "four tube" leakage of the ultra-supercritical boiler caused by structural cracking, effectively reducing the non-stop events of the unit, and providing protection for the safe operation of the boiler.

[0063] In actual work, the temperature of the small-diameter tube corner weld of the high-temperature component, the temperature of the water-cooled wall lower header tube seat corner weld can also be monitored. When the temperature difference between the header temperature and the temperature of the small-diameter tube screen restraint device exceeds the preset temperature boundary threshold, the boiler feed water flow is increased, the boiler water circulating pump output is increased, the circulation of the heat medium and the total heat output are accelerated, and the temperature difference of each part of the component is reduced.

[0064] In addition, the temperature of the tail flue package wall lower header tube seat and fin corner weld can also be monitored. When the temperature difference between the two side package wall medium temperatures exceeds the preset temperature boundary threshold, the boiler fuel usage is reduced, the boiler feed water flow is increased, the unit bypass opening is increased, the boiler heat input is slowed down, the heat output is increased, the boiler different system temperature is slowly raised, and the temperature difference is reduced.

[0065] The embodiment also provides an ultra-supercritical boiler pull-apart system based on the in-furnace wall temperature, which comprises:

[0066] a plurality of temperature sensors configured to acquire real-time measurement temperatures t of the risk positions of the boiler 测 ;

[0067] a processor;

[0068] a memory; and

[0069] one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the processor, and the programs are used to execute the above-mentioned method for preventing the ultra-supercritical boiler pull-apart based on the in-furnace wall temperature.

[0070] The above description is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacements or changes to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A method for preventing a supercritical boiler from being cracked based on a wall temperature in a furnace, the method comprising: calculating a wall temperature in a furnace; and determining whether the wall temperature is within a predetermined range. Comprise the following steps: S1, preset N boiler cracking risk positions, determine the temperature boundary threshold T of the risk position based on the stress level of the risk position N ; S2, simulate the real-time temperature field distribution of the boiler based on the boiler operation parameters through a preset model, to obtain the simulation temperature T of the N risk positions 模 ; S3, obtaining real-time measured temperature t of the M risk positions 测 , correcting the simulated real-time temperature field distribution by using t 测 , obtaining corrected simulated temperature T of the N risk positions by a preset model 修 ; S4, based on the temperature boundary threshold of N risk positions and the correction of the simulated temperature, early warning regulation and control of the boiler operation parameters; Wherein, M, N are natural numbers, M≤N.

2. The method for preventing a supercritical once-through boiler from being cracked based on a wall temperature in a furnace according to claim 1, characterized by, In S1, the stress level based on the risk position determines a temperature boundary threshold T of the risk position N , specifically: the stress level of the risk position is calculated by using finite element calculation, the maximum temperature deviation value T of the risk position is calculated according to the stress level 偏 , and the temperature boundary threshold T is determined according to the maximum temperature deviation value T 偏 . 阈 .

3. The method for preventing a supercritical once-through boiler from being cracked based on a wall temperature in a furnace according to claim 2, characterized by, The maximum temperature deviation value T 偏 is determined according to the temperature boundary threshold T 阈 , specifically: T 阈 = T 偏 -T 余 ; Wherein, T is the preset margin of early warning.

4. The method for preventing a supercritical once-through boiler from being cracked based on a wall temperature in a furnace according to claim 2, characterized by, The stress level of the risk position is calculated by finite element calculation, specifically, the grid division analysis of the risk position associated component is performed by using finite element processing software Altair.Hypermesh, and the stress level of the risk position is calculated according to the analysis result.

5. The method for preventing a supercritical once-through boiler from being cracked based on a wall temperature in a furnace according to claim 1, characterized by, In S2, the real-time temperature field distribution of the boiler is simulated based on the boiler operation parameters by a preset model, specifically: the flue gas is divided into multiple gas flows along the width and depth direction of the flue, the gas flow direction is determined based on the pipeline, and the real-time temperature field distribution of N risk positions is simulated by step-by-step iteration.

6. The method for preventing a supercritical once-through boiler from being cracked based on a wall temperature in a furnace according to claim 1, characterized by, In S4, the early warning regulation and control of the boiler operation parameters based on the temperature boundary threshold of N risk positions and the correction of the simulated temperature, specifically: first, according to the temperature boundary threshold of the risk position and the correction of the simulated temperature, whether the temperature of the risk position is abnormal is judged, and the early warning regulation and control parameter is selected according to the risk position with abnormal temperature.

7. The method for preventing a supercritical once-through boiler cracking according to claim 1, wherein In S1, the risk position specifically includes one or more of the following: horizontal flue wall joint, high temperature component small diameter weld, water wall lower header pipe seat fillet weld, tail flue wall lower header pipe seat and fin fillet weld.

8. The method for preventing a supercritical once-through boiler cracking according to claim 1 or 7, wherein The boiler operation parameters specifically include at least one of the following: boiler fuel use amount, boiler feed water flow, boiler boiler water circulating pump output, unit bypass opening degree.

9. The method according to claim 8, wherein the method is characterized by, The temperature of the horizontal flue wall joint is monitored, and when the temperature difference between the two sides of the joint wall exceeds the preset temperature boundary threshold, the opening degree of the boiler high pressure bypass valve is increased.

10. A system for preventing ultra-supercritical boiler cracking based on in-furnace wall temperature, characterized by, Comprise: a plurality of temperature sensors for acquiring real-time measured temperatures t of the boiler risk locations 测 ; A processor; A memory; And One or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the processor, the programs are used to execute the method for preventing ultra-supercritical boiler cracking based on the in-furnace wall temperature according to any one of claims 1-9.

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