A water wall area H 2 S concentration control method and adjustment device

Abstract

The present application discloses a control method and adjustment device for H2S concentration in a water-cooled wall area, including sampling and determining the sulfur content of the coal to be burned based on the type of coal entering the furnace; real-time monitoring of the CO content and H2S concentration in the areas to be tested based on different areas to be tested set on the boiler; theoretical analysis of the weight proportions of multiple factors affecting high-temperature corrosion of the boiler based on the fuzzy analytic hierarchy process; based on real-time monitoring data of CO content and H2S concentration, verifying the accuracy of the weights analyzed by the fuzzy analytic hierarchy process theory and increasing the correction coefficient k value; based on the corrected weight analysis, adjusting the boiler air distribution ratio, that is, adjusting the air volume and direction of the boiler air supply. The present application has the effect of controlling the reducing atmosphere of CO at the water-cooled wall position, reducing the H2S concentration in the boiler, alleviating the damage of high-temperature corrosion of the boiler, and maximizing the elimination of corrosion hazards.

Description

Technical Field

[0001] The present application relates to the technical field of power plant boiler operation control, and in particular to a water-cooled wall area H 2 S concentration control method and adjustment device. Background Art

[0002] The boiler is one of the main thermal equipment in a thermal power plant. When the boiler is in operation, fuel with energy is fed into the boiler, the fuel burns, the water-cooled walls around the boiler furnace are heated, and the water flowing inside the water-cooled walls is converted into superheated steam with thermal energy. The superheated steam is then provided to the steam turbine for subsequent energy conversion, thereby completing the power generation work of the power plant.

[0003] When the fuel in the boiler is burning, the oxygen content near the water-cooled wall is very low, the CO concentration is very high, and the combustion area is in a reducing atmosphere. At the same time, there is a large amount of corrosive gas near the water-cooled wall. In the reducing atmosphere, the main corrosive gas is H 2 S-based will cause serious high-temperature corrosion at the boiler water-cooled wall, causing the water-cooled wall tube to corrode and thin rapidly or even burst, seriously affecting the safety of boiler operation.

[0004] In response to the above-mentioned high-temperature corrosion of boilers, many power plants have installed CO and H 2 S measuring point, to obtain real-time data to monitor the normal combustion atmosphere in the boiler, so as to monitor and warn the high-temperature corrosion degree of the boiler. However, this data is generally only used for monitoring and does not play a role in the active protection of high-temperature corrosion of the boiler. Summary of the invention

[0005] In order to improve the CO and H 2 The real-time data obtained from the S measuring point is generally only used for monitoring and does not play a role in the active protection of boiler high-temperature corrosion. 2 S concentration control method and adjustment device.

[0006] In a first aspect, the present application provides a water-cooled wall area H 2 The method for controlling S concentration adopts the following technical solution:

[0007] A water wall area H 2 The methods for controlling S concentration include:

[0008] Based on the type of coal entering the furnace, sampling is performed to determine the sulfur content of the coal;

[0009] Based on setting different test areas on the boiler, the CO content and H 2 S concentration;

[0010] Based on the fuzzy analytic hierarchy process, the weight proportions of multiple influencing factors of high temperature corrosion of boilers are theoretically analyzed;

[0011] Based on the CO content and H 2 The real-time monitoring data of S concentration verifies the accuracy of the weights analyzed by the fuzzy analytic hierarchy process and increases the correction factor k value;

[0012] Based on the revised weight analysis, the air distribution adjustment position is set to adjust the boiler air distribution ratio, that is, to adjust the air volume and direction of the boiler air supply.

[0013] By adopting the above technical solution, the sulfur content, CO content and H 2 Based on the real-time monitoring data of S concentration, a large amount of test data was obtained. The test data was combined with the theoretical weights of the fuzzy hierarchical analysis method to compare and obtain the correction coefficient k value that meets the weights of the factors affecting the high-temperature corrosion of the tested boiler, so as to obtain a more accurate judgment on the area where the high-temperature corrosion of the tested boiler occurs. Then, by adjusting the air distribution ratio of the boiler at different positions, the combustion conditions at most positions in the furnace were made more sufficient, the reducing atmosphere of CO at the water-cooled wall position was reduced, and the H 2 S concentration can reduce the damage of high temperature corrosion of boiler and eliminate the hidden danger of corrosion to the greatest extent.

[0014] Optionally, the areas to be tested are arranged at different heights of the boiler.

[0015] By adopting the above technical solution, since the combustion atmosphere in the boiler is in a process of changing from oxygen-deficient to oxygen-rich from bottom to top, the combustion conditions of fuels at different heights will be inconsistent, which will lead to the generation of H 2 The S concentration is also different. 2 Setting the test areas at different heights according to S concentration is conducive to obtaining more accurate and targeted monitoring data.

[0016] Optionally, a plurality of sets of wind adjustment positions are correspondingly set for each area to be tested.

[0017] By adopting the above technical solution, several groups of air distribution adjustment positions are set corresponding to the test area. At different heights of the boiler, according to the immediate combustion situation in the boiler, the fuel airflow with different air volume and direction is blown in, so that each height position can obtain sufficient combustion, reduce the CO reducing atmosphere at the water-cooled wall, and indirectly control H 2 S concentration, reducing the damage caused by high temperature corrosion in boilers.

[0018] Optionally, based on the modified weight analysis, the type of coal entering the boiler for combustion at different positions of the boiler is adjusted.

[0019] By adopting the above technical solution, according to the modified weight analysis, the combustion coal with different sulfur contents is fed into the boiler at the corresponding position, and the H at the water-cooled wall is adjusted by adjusting the feeding ratio of the combustion coal with different sulfur contents. 2 The S concentration was controlled within the allowable range.

[0020] In a second aspect, the present application provides a water-cooled wall area H 2 The S concentration adjustment device adopts the following technical solution:

[0021] A water wall area H 2 An adjusting device for adjusting S concentration is arranged at the air distribution adjustment position of the boiler, and the adjusting device includes an outer shell fixedly connected to the outer wall of the boiler and connected to the boiler furnace, an inner sleeve fixedly connected to the outer shell, a mixed fuel air flow inlet pipe connected to the end of the inner sleeve away from the boiler, a secondary air inlet pipe connected to the inner sleeve, an air volume adjustment component arranged inside the secondary air inlet pipe, and a wind direction adjustment component arranged on the end of the inner sleeve facing the boiler.

[0022] By adopting the above technical solution, the mixed fuel air flow inlet pipe blows the mixed fuel air flow of pulverized coal and primary air into the inner sleeve, and finally passes through the inner sleeve into the furnace of the boiler. The secondary air flows through the secondary air inlet pipe to provide oxygen for the combustion of the fuel air flow, and strengthen the disturbance of the air flow, promote the full mixing of combustibles and oxygen, and provide conditions for complete combustion; the air volume adjustment component controls and adjusts the air volume of the secondary air in the secondary air inlet pipe, and the wind direction adjustment component adjusts the fuel air flow and the direction of the secondary air sent into the furnace, thereby promoting the full combustion of the fuel air flow in the furnace and reducing the concentration of the CO reducing atmosphere generated at the water-cooled wall, thereby achieving the control of H at the water-cooled wall. 2 S concentration, reducing the occurrence of high-temperature corrosion at the water-cooled wall.

[0023] Optionally, the air volume adjustment component includes an impeller rotatably disposed inside the secondary air inlet duct, the impeller being connected to a plurality of groups of blades, the blades being distributed circumferentially along an outer contour of the impeller, and each group of blades being rotatably connected to the impeller.

[0024] By adopting the above technical solution, the blades and the impeller are rotatably connected, and the gaps between adjacent blades are adjusted from opening to closing through rotation adjustment of the blades, thereby adjusting the air volume of the secondary air in the secondary air inlet pipe, so that the fuel air flow combustion in the furnace can obtain a suitable air volume supply, thereby reducing the concentration of the CO reducing atmosphere at the water-cooled wall; and the impeller itself drives the blades to rotate, pressurizes the secondary air, and delivers the secondary air to the boiler more stably and quickly.

[0025] Optionally, a rotating ball is fixedly connected to one end of the blade, a rotating hole is opened on the outer wall of the impeller, the rotating ball is partially embedded in the rotating hole, the end of the rotating ball away from the blade is fixedly connected to a rotating shaft, one end of the rotating shaft is transmission-connected to a micro motor, and the micro motor is fixed inside the impeller.

[0026] By adopting the above technical solution, the micro motor drives the rotating ball to rotate through the rotating shaft, and the rotation of the rotating ball drives the blades to adjust the angle, thereby realizing the opening and closing control of the gap between adjacent blades. The friction resistance between the rotating ball and the rotating hole is small, the rotation is stable and reliable, the structure is simple and practical, and the reliability of the air volume adjustment component is improved.

[0027] Optionally, the blade is configured as a cambered transition structure.

[0028] By adopting the above technical solution, the blades are set as an arc transition structure. After the secondary air enters the secondary air inlet pipe, it impacts the arc surface of the blades. The secondary air is guided obliquely, which enhances the intensity of the secondary air flow and enables the secondary air to flow into the furnace more stably, thereby enhancing the stirring effect of the airflow, thereby enabling the fuel airflow to obtain a better combustion effect.

[0029] Optionally, the wind direction adjustment component includes an directional seat fixedly connected to one end of the inner sleeve, the directional seat is a spherical structure, a through air outlet is provided on the directional seat, and the air outlet is connected to the inner sleeve; an adjusting seat is rotatably arranged on the outer side of the directional seat, the adjusting seat is a spherical structure, a adjusting port is provided on the adjusting seat, the diameter of the adjusting port is smaller than the air outlet, and the adjusting port and the air outlet are arranged overlapping; cylinders are hinged on both sides of the adjusting seat, and the cylinders are used to drive the adjusting seat and the directional seat to rotate relative to each other.

[0030] By adopting the above technical solution, the directional seat and the inner sleeve are connected, and the fuel airflow can pass through the air outlet on the directional seat and finally spray into the furnace from the adjusting port on the adjusting seat; the piston rod of the cylinder extends to drive the adjusting seat to rotate at a certain angle relative to the directional seat, so that the adjusting port and the air outlet are deflected at a certain angle, thereby changing the direction of the fuel airflow entering the furnace, so that the fuel airflow reaches the appropriate combustion position for sufficient combustion.

[0031] Optionally, an air intake passage is provided between the inner sleeve and the outer sleeve, and one end of the outer sleeve located in the boiler is provided with inclined openings on both sides.

[0032] By adopting the above technical solution, the outside air enters the furnace from the air intake channel between the inner sleeve and the outer shell, and is guided by the opening of the inclined surface at the end of the outer shell. The air flow flows toward the position of the water-cooled walls on both sides, diluting the CO reducing atmosphere at the water-cooled walls and reducing H 2The concentration of S is beneficial to protecting the water-cooled wall and avoiding serious high-temperature corrosion.

[0033] In summary, the present application includes at least one of the following beneficial technical effects:

[0034] 1. By setting the sulfur content, CO content and H 2 The S concentration is measured, and the correction coefficient k value of the fuzzy hierarchical analysis method is increased by comparing the measured data. Based on the corrected weight analysis, the boiler air distribution ratio is adjusted accordingly to make the combustion at most positions in the furnace more complete, reduce the content of CO reducing atmosphere at the water-cooled wall, and thus reduce the H 2 S concentration can reduce the damage of high temperature corrosion of boiler and eliminate the hidden danger of corrosion to the greatest extent.

[0035] 2. By setting the air volume adjustment component of the adjustment device, the gaps between adjacent blades are opened and closed by rotating the blades, so as to adjust the air volume of the secondary air in the secondary air inlet pipe, so that the fuel air flow combustion in the furnace can obtain the appropriate air volume supply, thereby reducing the concentration of CO reducing atmosphere at the water-cooled wall, and then reducing the H 2 S concentration.

[0036] 3. By setting the wind direction adjustment component, the piston rod of the cylinder extends, driving the direction adjustment seat to rotate at a certain angle relative to the directional seat, so that the adjustment port and the air outlet produce a certain angle deflection, thereby changing the direction of the fuel airflow entering the furnace, so that the fuel airflow reaches the appropriate combustion position for full combustion, further reducing the concentration of the CO reducing atmosphere at the water-cooled wall, and thus achieving the H 2 Effective control of S concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic cross-sectional expansion diagram of a boiler in an embodiment of the present application;

[0038] Figure 2 is a schematic diagram of the structure of the adjustment device in the embodiment of the present application;

[0039] Figure 3 is a cross-sectional schematic diagram of an adjustment device in an embodiment of the present application;

[0040] Figure 4 It is an exploded schematic diagram of the cooperation between the impeller and the blades in the embodiment of the present application.

[0041] Explanation of the reference numerals in the accompanying drawings: 1. boiler; 11. left wall; 12. right wall; 13. area to be tested; 14. monitoring point; 15. front wall; 16. rear wall; 17. air distribution adjustment position; 2. outer shell; 21. inclined surface opening; 3. inner sleeve; 4. mixed fuel air flow inlet pipe; 5. secondary air inlet pipe; 6. air volume adjustment assembly; 61. impeller; 611. rotating hole; 62. mounting seat; 63. driving motor; 64. blades; 65. rotating ball; 66. rotating shaft; 67. micro motor; 7. wind direction adjustment assembly; 71. directional seat; 711. air outlet; 72. direction adjustment seat; 721. adjustment port; 73. cylinder; 8. air intake channel. DETAILED DESCRIPTION

[0042] The following is combined with Figure 1-4 This application is described in further detail.

[0043] The present application embodiment discloses a water-cooled wall area H 2 For the control method of S concentration, refer to Figure 1 , including:

[0044] Based on the type of coal entering the furnace, sampling is performed to determine the sulfur content of the coal.

[0045] Based on setting different test areas 13 on the left wall 11 and the right wall 12 of the boiler 1, multiple groups of monitoring test points 14 are set in different test areas 13 to monitor the CO content and H content in the test area 13 in real time. 2 The test area 13 is provided with several groups from bottom to top on the side wall of the boiler 1, respectively, for the CO content and H 2 The S concentration was monitored in real time.

[0046] Based on the fuzzy analytic hierarchy process, the weight proportions of multiple influencing factors of high-temperature corrosion of boiler 1 are theoretically analyzed; the factors affecting high-temperature corrosion of boiler 1 are systematically investigated, and different weights are assigned accordingly based on the fuzzy analytic hierarchy process.

[0047] Based on the CO content and H 2 The real-time monitoring data of S concentration is used to verify the accuracy of the weights analyzed by the fuzzy hierarchical analysis method theory, and to increase the correction coefficient k value; the boiler 1 to be tested is tested, and the single influencing factors are tested one by one through the control variable method, and the large amount of data obtained from the test is sorted, collected and analyzed, and then the weights analyzed by the fuzzy hierarchical analysis method are compared and adaptively corrected, the corrected k value is increased, and the accuracy of the weights is iteratively updated.

[0048] Based on the revised weight analysis, air distribution adjustment positions 17 are set on the front wall 15 and the rear wall 16 of the boiler 1 to adjust the air distribution ratio of the boiler 1, that is, to adjust the air volume and direction of the air supplied to the boiler 1. Through the revised weight guidance, the appropriate air intake volume and air intake direction are controlled, so that the fuel airflow can be more fully burned, the CO reducing atmosphere at the water-cooled wall is reduced, and the H 2 The concentration of S. Several groups of air distribution adjustment positions 17 of the boiler 1 are provided corresponding to different test areas 13, and the adjustment devices on the several groups of air distribution adjustment positions 17 are independently controlled to achieve high-precision and targeted adjustment effects at different heights.

[0049] Based on the revised weight analysis and combined with the sampling test of the sulfur content of the incoming coal, the types of incoming coal at different heights of boiler 1 are adaptively adjusted so that different heights of the furnace burn coal with different sulfur contents, thereby achieving better combustion effects and controlling the H in the water-cooled wall area. 2 The generation of S.

[0050] The present application also discloses a water-cooled wall region H 2 The S concentration adjustment device is provided with multiple adjustment devices, and the multiple adjustment devices are respectively installed at each air distribution adjustment position 17 on the boiler 1, and the multiple adjustment devices are independently controlled to make targeted adjustments to the air distribution at different height areas in the boiler. Figure 2 The adjusting device includes a shell 2, which is a shell structure with a hollow interior. The shell 2 is fixed to the outer wall of the boiler 1 and is connected to the furnace of the boiler 1.

[0051] Reference Figure 2 and Figure 3 The outer shell 2 is centrally provided with an inner sleeve 3, which is fixedly connected to the outer shell 2. The end of the inner sleeve 3 away from the boiler 1 is fixedly connected with a mixed fuel airflow inlet pipe 4, which is connected to an external fan. The external fan blows a fuel airflow composed of a mixture of pulverized coal and primary air into the inner sleeve 3, and then passes through the inner sleeve 3 and is sent into the boiler 1 for combustion and heat release.

[0052] One side of the inner sleeve 3 is also fixedly connected to a secondary air intake pipe 5, which is used to introduce secondary air into the boiler 1, thereby increasing the combustion oxygen content and enhancing the air flow disturbance. An air volume adjustment component 6 is provided in the secondary air intake pipe 5.

[0053] Reference Figure 3 and Figure 4The air volume adjustment component 6 includes an impeller 61, which is rotatably arranged inside the secondary air inlet pipe. A mounting seat 62 is fixedly connected in the secondary air inlet pipe, and a driving motor 63 is fixedly connected to the mounting seat 62. The driving motor 63 is transmission-connected to the impeller 61, and the driving motor 63 is used to drive the impeller 61 to rotate. The outer side of the impeller 61 is connected with a blade 64, and the blade 64 is set as an arc surface transition structure. The blade 64 is arranged in a plurality of groups along the circumference of the outer contour of the impeller 61, and each group of blades 64 is rotationally connected to the impeller 61. A rotating ball 65 is fixedly connected to one end of the blade 64, and an adapted rotating hole 611 is correspondingly opened on the outer side wall of the impeller 61. The rotating ball 65 is partially embedded in the rotating hole 611 for rotation. A rotating shaft 66 is fixedly connected to the end of the rotating ball 65 away from the blade 64, and a micro motor 67 is transmission-connected to the other end of the rotating shaft 66, and the micro motor 67 is fixed to the inside of the impeller 61.

[0054] After the secondary air enters the secondary air intake pipe 5, the driving motor 63 drives the impeller 61 to rotate, thereby pressurizing the secondary air and allowing it to flow more quickly and stably into the inner sleeve 3. The micro motor 67 rotates and adjusts the rotating ball 65 and the blades 64 through the rotating shaft 66, and the gaps between adjacent blades 64 are opened or closed, thereby adjusting the passing air volume of the secondary air in the secondary air intake pipe 5.

[0055] The end of the inner sleeve 3 facing the boiler 1 is provided with a wind direction adjustment component 7, which includes a directional seat 71, which is fixedly connected to the end of the inner sleeve 3, and a through air outlet 711 is provided on the directional seat 71, and the air outlet 711 is connected with the directional seat 71. The directional seat 71 is a spherical structure, and a direction adjustment seat 72 is provided on the outer side of the directional seat 71, and the direction adjustment seat 72 is also a spherical structure, and the direction adjustment seat 72 and the directional seat 71 are connected to each other in a rotational manner. The direction adjustment seat 72 is provided with an adjustment port 721, which is arranged to overlap with the air outlet 711, and is always connected, and the diameter of the adjustment port 721 is smaller than the air outlet 711.

[0056] Cylinders 73 are hinged on both sides of the direction-adjusting seat 72. The cylinders 73 are fixed to the side walls of the boiler 1 through support plates. The cylinders 73 are used to drive the direction-adjusting seat 72 to rotate at a certain angle relative to the directional seat 71. The fuel gas flow flows from the inner sleeve 3 to the directional seat 71, and is finally ejected into the boiler 1 from the regulating port 721 of the direction-adjusting seat 72. As the angle of the regulating port 721 rotates, the direction of the fuel gas flow entering the boiler 1 also changes.

[0057] Reference Figure 2 and Figure 3The gap between the outer shell 2 and the inner sleeve 3 is an air intake channel 8, which is used to transport a small amount of air into the boiler 1. The end of the outer shell 2 located in the boiler 1 is provided with inclined surface openings 21 on both sides, and the openings face the water-cooled wall areas on both sides. After the air enters the furnace, the air flow flows toward the positions of the water-cooled walls on both sides, thereby diluting the reducing atmosphere of CO at the water-cooled wall, which is beneficial to reducing H 2 The concentration of S.

[0058] The implementation principle of the embodiment of the present application is as follows: the mixed fuel airflow composed of pulverized coal and primary air enters the inner sleeve 3 from the mixed fuel airflow inlet pipe 4, and is finally sprayed into the furnace from the regulating port 721 of the adjusting seat 72; the secondary air enters the inner sleeve 3 from the secondary air inlet pipe 5, and is also sprayed into the furnace from the regulating port 721. The micro motor 67 controls and adjusts the secondary air supply volume of the boiler 1 by rotating the adjacent blades 64 from opening to closing. The cylinder 73 changes the direction of the regulating port 721 by relative rotation adjustment of the adjusting seat 72 and the directional seat 71, thereby controlling and adjusting the air inlet direction. The adjustment device is installed at each air distribution adjustment position 17 of the boiler 1 and is independently controlled. By controlling the air inlet volume and air inlet direction of the boiler 1, the reducing atmosphere of CO in the water-cooled wall area is weakened, thereby adjusting H 2 The concentration of S plays a controlling role in the reduction.

[0059] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A water-cooled wall area H 2 S concentration adjustment device, Features: The adjustment device is arranged at an air distribution adjustment position (17) of the boiler (1), and comprises an outer shell (2) fixedly connected to the outer wall of the boiler (1) and connected to the inner cavity of the boiler (1), an inner sleeve (3) fixedly connected to the inner cavity of the outer shell (2), a mixed gas intake pipe (4) connected to an end of the inner sleeve (3) away from the boiler (1), a secondary air intake pipe (5) connected to the inner sleeve (3), an air volume adjustment component (6) arranged inside the secondary air intake pipe (5), and an air volume adjustment component (6) arranged at the inner sleeve (3) facing the boiler (1) ) at one end; the air volume adjustment component (6) comprises an impeller (61) rotatably arranged inside the secondary air inlet pipe, the impeller (61) being connected to a plurality of groups of blades (64), the blades (64) being distributed along the circumference of the outer contour of the impeller (61), and each group of blades (64) being rotatably connected to the impeller (61); a rotating ball (65) being fixedly connected to one end of the blade (64), a rotating hole (611) being opened on the outer side wall of the impeller (61), and a rotating ball (65) being arranged on the outer side wall of the impeller (61) The rotating ball (65) is embedded in the rotating hole (611); one end of the rotating ball (65) away from the blade (64) is fixedly connected to a rotating shaft (66); one end of the rotating shaft (66) is transmission-connected to a micro motor (67); the micro motor (67) is fixedly connected to the inside of the impeller (61); the wind direction adjustment component (7) comprises a directional seat (71) fixedly connected to one end of the inner sleeve (3); the directional seat (71) is a spherical structure; a penetrating air outlet (711) is formed on the directional seat (71); the air outlet (711) is connected to the impeller (61); An inner sleeve (3); an adjusting seat (72) is rotatably provided on the outer side of the directional seat (71); the adjusting seat (72) is a spherical structure; an adjusting port (721) is provided on the adjusting seat (72); the diameter of the adjusting port (721) is smaller than the air outlet (711); the adjusting port (721) and the air outlet (711) are arranged overlapping; cylinders (73) are hingedly connected on both sides of the adjusting seat (72); the cylinders (73) are used to drive the adjusting seat (72) and the directional seat (71) to rotate relative to each other.

2. A water-cooled wall region H according to claim 1 2 S concentration adjustment device, Features: The blade (64) is configured as a cambered transition structure.

3. A water-cooled wall region H according to claim 1 2 S concentration adjustment device, Features: An air intake passage (8) is provided between the inner sleeve (3) and the outer sleeve (2), and one end of the outer sleeve (2) located inside the boiler (1) is provided with inclined surface openings (21) on both sides.

4. A water-cooled wall area H 2 S concentration control method, Features: The method comprises: Based on the type of coal entering the furnace, sampling is performed to determine the sulfur content of the coal; Based on setting different test areas (13) on the boiler (1), each test area (13) is correspondingly provided with a plurality of groups of air distribution adjustment positions (17), and the air distribution adjustment positions (17) are provided with a water-cooled wall area H as described in any one of claims 1 to 3. 2 The device for adjusting the S concentration monitors the CO content and H 2 S concentration; Based on the fuzzy analytic hierarchy process, the weight proportions of multiple influencing factors of boiler (1) high temperature corrosion are theoretically analyzed; Based on the CO content and H 2 The real-time monitoring data of S concentration verifies the accuracy of the weights analyzed by the fuzzy analytic hierarchy process and increases the correction factor k value; Based on the corrected weight analysis, the air distribution adjustment position (17) is set to adjust the air distribution ratio of the boiler (1), that is, to adjust the air volume and direction of the air supply of the boiler (1).

5. A water-cooled wall region H according to claim 4 2 S concentration control method, Features: The areas to be tested (13) are arranged at different heights of the boiler (1).

6. A water-cooled wall region H according to claim 4 2 S concentration control method, Features: Based on the modified weight analysis, the type of coal fed into the boiler (1) for combustion at different heights is adjusted.

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