A side wall water-cooling wall protection device based on horizontal thick and thin separation

Abstract

A sidewall water-cooled wall protection device based on horizontal thick-lean separation includes wall-mounted air nozzles arranged on both sides of the front and rear walls of a coal-fired power plant boiler. Burners are disposed between the wall-mounted air nozzles on both sides of the front and rear walls. The burners include an outermost burner adjacent to the wall-mounted air nozzle and several other intermediate burners. A louvered coal powder concentrator is disposed within the primary air duct of the outermost burner. The primary air nozzles of the outermost burner are divided into a thick coal powder nozzle and a thin coal powder nozzle. The thick coal powder nozzle is located on the side near the intermediate burner along the width of the boiler, and the thin coal powder nozzle is located on the side near the left or right wall of the boiler. The coal powder pipe of the outermost burner is introduced horizontally from the primary air duct and connected to the primary air duct through an elbow. The thick coal powder nozzle and the thin coal powder nozzle are independently provided with dampers to adjust the air distribution. The present invention can significantly improve the atmosphere of the sidewall water-cooled wall.

Description

Technical Field

[0001] The invention belongs to the field of coal-fired power station boilers and relates to a side wall water-cooled wall protection device based on horizontal thick-thin separation. Background Art

[0002] The burners of a front-to-back wall-fired boiler are arranged on the front and rear walls. High-temperature corrosion is common in the area between the left and right walls, extending from the lowest burner level to the overfire burner level. For example, a 350MW supercritical unit experienced high-temperature corrosion in the spiral tube water-cooled walls on the left and right walls between the B and C burners. The lowest thickness of the water-cooled wall, where the thinnest thinning occurred, was approximately 1.2mm, less than one-fifth of the original thickness. A 660MW supercritical unit also experienced high-temperature corrosion in the area between the lower burner level and the upper burner level on both sides of the wall. Thickness measurements revealed a water-cooled wall thickness of 5.7mm at its thinnest point (the original design thickness was 7.5mm). The corrosion product layer on the water-cooled wall tubes was loosely bonded to the water-cooled wall and could be easily removed with external force. After the corrosion products fell off, the outer wall of the water-cooled wall appeared dark black. During a shutdown and overhaul of a 1000MW ultra-supercritical unit, it was found that the wall thickness of the water-cooled wall tubes on both sides had thinned by up to about 2mm. 599 tubes totaling 2000m were replaced.

[0003] The occurrence of high-temperature corrosion is mainly related to factors such as the high sulfur content of the coal, the strong reducing atmosphere near the side water-cooled walls, and the erosion of flue gas and coal powder airflow. In order to solve the problem of high-temperature corrosion of the water-cooled walls on both sides of the front and rear wall-hedge combustion boiler, domestic boiler manufacturers, research institutes, etc. have proposed active protection and passive protection solutions. The purpose of active protection is to improve the reducing atmosphere of the water-cooled walls on both sides by increasing the distance between the outermost burner and the side wall, controlling the sulfur content of the coal entering the furnace, conducting combustion optimization adjustment tests, and modifying the wall air. Passive protection mainly involves implementing anti-corrosion spray protection in the high-temperature corrosion areas of the water-cooled walls on both sides. The combustion optimization adjustment test work includes adjusting the fineness of the coal powder and optimizing the secondary air of the burner. When the coal powder fineness is controlled at a low level, the coal powder ignites and burns in time, which can prevent the unburned coal powder from continuing to burn at the side wall, consuming the oxygen at the side wall, and causing the reducing atmosphere at the side wall water-cooled wall to increase; the burner secondary air optimization mainly increases the secondary air opening outside the outermost burner, so that the secondary air volume outside the outermost burner increases and the swirl intensity weakens, which can improve the atmosphere of the side wall water-cooled wall.

[0004] However, there are still many problems in the implementation of the existing technology, mainly including: the anti-corrosion spray protection of the water-cooled wall is greatly affected by the spraying process and spraying materials, and the spraying needs to be re-implemented every 2 to 3 years; due to changes in the coal market and the operating pressure of coal-fired power plants, the proportion of high-sulfur coal is relatively large; in order to meet the output of the pulverizer and the load capacity of the unit, the coal powder fineness cannot be controlled to be fine; the secondary air opening outside the outermost burner is the largest, and the swirl intensity is weakened, resulting in a decrease in the ability to entrain high-temperature flue gas, which is not conducive to the ignition and stable combustion of coal powder; the added wall-mounted air nozzles are prone to slagging and burning, and the wall-mounted air effect is lost. Summary of the Invention

[0005] The purpose of the present invention is to address the problem of high-temperature corrosion of the side wall water-cooled wall of the hedge-fired boiler in the above-mentioned prior art, and to provide a side wall water-cooled wall adhesion protection device based on horizontal thick and thin separation. Under the premise of ensuring stable combustion of coal powder, the wall heat load of the two side wall areas is reduced, the wall atmosphere of the two side wall water-cooled wall is improved, and thus the high-temperature corrosion of the water-cooled wall is effectively avoided.

[0006] In order to achieve the above object, the present invention has the following technical solutions:

[0007] A side wall water-cooled wall wall protection device based on horizontal thick and thin separation includes wall-mounted air nozzles arranged on both sides of the front wall and the rear wall of a coal-fired power station boiler, burners are provided between the wall-mounted air nozzles on both sides of the front wall and the rear wall, the burners include an outermost burner adjacent to the wall-mounted air nozzle and several other middle area burners; a shutter-type pulverized coal concentrator is provided in the primary air duct of the outermost burner, the primary air nozzle of the outermost burner is divided into a thick pulverized coal nozzle and a thin pulverized coal nozzle, the side close to the middle area burner along the width direction of the boiler is the thick pulverized coal nozzle, and the side close to the left wall or right wall of the boiler is the thin pulverized coal nozzle, the pulverized coal pipe of the outermost burner is introduced from the horizontal height direction of the primary air duct and is connected to the primary air duct through an elbow; the air distribution can be adjusted by independently arranged dampers on the thick pulverized coal nozzle and the thin pulverized coal nozzle.

[0008] Preferably, the outermost burner is a swirl burner, and the burner air distribution consists of primary air, inner secondary air, thick side outer secondary air, and lean side outer secondary air; the thick side outer secondary air duct and the lean side outer secondary air duct of the swirl burner are semicircular ring air ducts, separated by an outer secondary air duct partition; the nozzles of the outermost burner are respectively the primary air nozzle, the inner secondary air nozzle, and the outer secondary air nozzle from the inside to the outside; the primary air nozzle is a circular nozzle, and a middle partition is provided in the nozzle, which vertically divides the primary air nozzle into a semicircular thick coal powder nozzle and a lean coal powder nozzle; the wind sources of the inner secondary air, the thick side outer secondary air, and the lean side outer secondary air of the outermost burner are taken from the bellows; a fixed swirler is provided in the inner secondary air duct of the outermost burner, and the swirl intensity of the inner secondary air of the outermost burner is not adjustable; an inner secondary air adjustment rod is provided on the burner panel of the outermost burner, and the amount of the inner secondary air can be adjusted by displacing the inner secondary air adjustment rod along the axial direction of the burner.

[0009] Preferably, the rich side outer secondary air duct is on the same side as the rich coal powder nozzle, and the rich side outer secondary air volume and its swirl intensity are adjusted by the rich side impeller-type air door baffle arranged tangentially on the outermost burner. A rich side outer secondary air door operating lever is provided on the burner panel. The deflection angle of the rich side outer secondary air door operating lever is adjusted to drive the rich side impeller-type air door baffle to rotate and change its rotation angle to simultaneously adjust the rich side outer secondary air volume and the rich side outer secondary air swirl intensity.

[0010] Preferably, the light side outer secondary air duct is on the same side as the light coal powder nozzle, and the light side outer secondary air volume and its swirl intensity are adjusted by the light side impeller type damper plate arranged tangentially on the outermost burner. A light side outer secondary damper operating lever is provided on the burner panel. Adjusting the deflection angle of the light side outer secondary damper operating lever drives the light side impeller type damper plate to rotate, changing its rotation angle, so as to simultaneously adjust the light side outer secondary air volume and the light side outer secondary air swirl intensity.

[0011] Preferably, the louver-type pulverized coal concentrator comprises a cavity formed by connecting a concentrator shell and a middle partition, and louver-type concentrating blades arranged in the cavity.

[0012] Preferably, the intermediate area burner is a swirl burner, and the burner air distribution consists of primary air, central air, inner secondary air, and outer secondary air. The inner secondary air duct and the outer secondary air duct are concentric annular channels. The pulverized coal pipe of the intermediate area burner is connected from directly below the primary air duct, and the wind sources of the central air, inner secondary air, and outer secondary air are taken from the wind box; a fixed swirler is provided in the inner secondary air duct of the intermediate area burner, and the swirl intensity of the inner secondary air of the intermediate area burner is not adjustable; an inner secondary air adjustment rod is provided on the burner panel of the intermediate area burner, and the amount of the inner secondary air can be adjusted by displacing the inner secondary air adjustment rod along the axial direction of the burner.

[0013] Preferably, the air volume and swirl intensity of the external secondary air of the middle zone burner are adjusted by an integral impeller-type damper plate arranged tangentially on the burner, and an external secondary air damper operating lever is provided on the burner panel of the middle zone burner; by adjusting the deflection angle of the external secondary air damper operating lever, the integral impeller-type damper plate is driven to rotate, and its rotation angle is changed to simultaneously adjust the external secondary air volume and the external secondary air swirl intensity.

[0014] Preferably, the wall-attached wind nozzle is a circular nozzle, the wall-attached wind is direct wind, and its wind source is taken from the hot primary air main pipe.

[0015] Compared to the existing technology, the present invention has the following beneficial effects: Different from the radial coal concentration deviation of the pulverized coal nozzle of the traditional swirl burner, the present invention introduces pulverized coal horizontally through an elbow, adds a louvered pulverized coal concentrator, and horizontally separates the jet flow from the pulverized coal nozzle of the outermost burner of the front and rear wall counter-fired boiler into a concentrated coal flow and a lean coal flow. Separate dampers for the concentrated and lean coal flows are provided to adjust the air distribution. This reduces the impact of pulverized coal scouring on the boiler side wall water-cooled wall without reducing the burner heat load or affecting the stability of pulverized coal ignition, reduces the combustion heat load at the side wall, and helps improve the side wall water-cooled wall atmosphere. The horizontal concentrated and lean separation of the pulverized coal nozzle of the outermost burner combined with the direct current jet wall airflow can significantly improve the side wall atmosphere, solving the problem of high-temperature corrosion of the side wall water-cooled wall of the counter-fired boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of the outermost burner of the present invention;

[0017] Figure 2 A schematic structural diagram of the middle zone burner of the present invention;

[0018] Figure 3 Schematic diagram of the arrangement structure of the side wall water-cooling wall protection device of the present invention;

[0019] Figure 4 A schematic diagram of the nozzle structure of the outermost burner of the present invention;

[0020] In the attached figure: 1-front wall, 2-rear wall, 3-outermost burner, 4-middle area burner, 5-primary air duct, 6-louvered pulverized coal concentrator, 7-primary air nozzle, 8-rich pulverized coal nozzle, 9-lean pulverized coal nozzle, 10-left wall, 11-right wall, 12-pulverized coal pipe, 13-elbow, 14-wall air nozzle, 15-rich side outer secondary air duct, 16-lean side outer secondary air duct, 17-outer secondary air duct partition, 18-inner secondary air nozzle, 19-outer secondary Secondary air nozzle, 20-middle partition, 21-bellows, 22-concentrator shell, 23-concentrating blades, 24-rich side impeller-type damper, 25-rich side outer secondary air door operating lever, 26-lean side impeller-type damper, 27-lean side outer secondary air door operating lever, 28-inner secondary air duct, 29-outer secondary air duct, 30-fixed cyclone, 31-burner panel, 32-inner secondary air adjustment rod, 33-integral impeller-type damper, 34-outer secondary air door operating lever. DETAILED DESCRIPTION

[0021] The present invention will be described in further detail below with reference to the accompanying drawings.

[0022] In response to the problem of high-temperature corrosion of the water-cooled walls of front and rear wall counter-fired combustion boilers, the present invention proposes a side wall water-cooled wall wall protection device based on horizontal thick-thin separation, including wall-attached air nozzles 14 respectively arranged on both sides of the front wall 1 and the rear wall 2 of the coal-fired power station boiler, and burners are provided between the wall-attached air nozzles 14 on both sides of the front wall 1 and the rear wall 2. The burners include the outermost burners 3 adjacent to the wall-attached air nozzles 14 and several intermediate area burners 4 arranged between the outermost burners 3.

[0023] See also Figure 2 The middle area burner 4 of the present invention divides the combustion air into primary air, central air, inner secondary air, and outer secondary air. The primary air carries coal powder particles to form a coal powder airflow, which enters the burner primary air duct 5 and the primary air nozzle 7 in sequence from the coal powder pipe 12 just below the primary air duct 5 of the middle area burner 4. The central air, inner secondary air, and outer secondary air are taken from the wind box 21, and the central air enters the furnace through the circular central air duct; the inner secondary air and outer secondary air enter the furnace through the concentric inner secondary air and outer secondary air annular channels in the burner. The inner secondary air and the outer secondary air are axial swirl winds, which form an annular reflux in the area near the burner, bring the high-temperature flue gas back to the area near the burner, heat the primary air, ignite the coal powder, and maintain flame stability.

[0024] See also Figure 1 , Figure 4The outermost burner 3 divides the combustion air into primary air, inner secondary air, rich side outer secondary air, and lean side outer secondary air. The primary air carries pulverized coal particles to form a pulverized coal airflow, which flows through the pulverized coal pipe 12 corresponding to the outermost burner 3, the primary air duct 5 (including the louvered pulverized coal concentrator 6), and the primary air nozzle 7 to enter the furnace for combustion. The pulverized coal airflow enters the primary air duct 5 from the pulverized coal pipe 12 corresponding to the outermost burner 3. Since the pulverized coal pipe 12 corresponding to the outermost burner 3 is introduced from the horizontal height of the primary air duct 5 and is provided with a 90° elbow 13 for horizontal connection, after the pulverized coal airflow passes through the elbow 13, most of the pulverized coal particles are concentrated in the outer wall area of ​​the pipe under the action of centrifugal force, forming a concentration deviation. After passing through this elbow 13, the pulverized coal airflow is divided into a rich pulverized coal airflow and a lean pulverized coal airflow, of which the part near the outer wall of the elbow is the rich pulverized coal airflow, and the part near the inner wall of the elbow is the lean pulverized coal airflow. A louvered coal concentrator 6 is installed within the primary air duct 5 of the outermost burner 3. The rich and lean coal airflows flow through the louvered coal concentrator 6, forming stable horizontal streams of rich and lean coal airflows under the action of the concentrating blades 23, the rich-side impeller damper 24, and the middle partition 20. Along the width of the boiler, the rich coal airflow occurs near the middle burner 4, while the lean coal airflow occurs near the boiler sidewall. The rich and lean coal airflows enter the furnace through the rich coal nozzle 8 and the lean coal nozzle 9, respectively. The inner secondary air, rich-side outer secondary air, and lean-side outer secondary air for the outermost burner 3 are drawn from the wind box 21. The rich-side outer secondary air duct and the lean-side outer secondary air duct are semicircular ducts separated by the outer secondary air duct partition 17. The rich / lean side external secondary air is located on the same side as the rich / lean pulverized coal nozzles. The rich / lean side external secondary air volume and swirl intensity are adjusted by the rich / lean side impeller damper arranged tangentially on the burner. A rich / lean side external secondary air damper control lever is located on the burner panel. By adjusting the deflection angle of the rich / lean side external secondary air damper control lever, the impeller damper rotates, changing its rotation angle to simultaneously adjust the rich / lean side external secondary air volume and swirl intensity. When the deflection angle of the rich / lean side external secondary air damper control lever is closed, the rich / lean side external secondary air volume is reduced and the swirl intensity of the rich / lean side external secondary air is increased. When the deflection angle of the rich / lean side external secondary air damper control lever is opened, the rich / lean side external secondary air volume is increased and the swirl intensity of the rich / lean side external secondary air is reduced.

[0025] See also Figure 3In an opposed-firing boiler, pulverized coal burners are arranged on the front and rear walls 1 and 2 of the boiler, creating a counter-fire effect. The water-cooled walls between the left and right walls 10 and 11 are subject to the erosion of the pulverized coal burners and the reducing atmosphere near the walls, leading to severe high-temperature corrosion of the water-cooled walls in this area. To address this high-temperature corrosion, it is necessary to reduce the combustion heat load at the side walls and increase the oxygen content near the side walls. The present invention replaces the pulverized coal nozzles of the outermost burners 3 on the front and rear walls 1 and 2 with horizontally separated pulverized coal nozzles. The light pulverized coal nozzles near the left and right walls 10 and 11 reduce the combustion heat load in the sidewall area and improve the atmosphere along the sidewall water-cooled wall. Combined with direct current jet-adhering wind, this prevents pulverized coal from scouring the sidewall water-cooled wall and improves the atmosphere along the sidewall water-cooled wall. A straight, circular wind nozzle 14 is arranged between the outermost burners 3 and the sidewalls. Hot air from the primary hot air main pipe enters the furnace through the wind nozzle 14, forming a protective film on the sidewall water-cooled wall. The horizontal separation of pulverized coal nozzles in the outermost burners 3 and the addition of wind along the wall fundamentally address the problem of high-temperature corrosion of the sidewall water-cooled wall.

[0026] The primary air nozzle 7 of the outermost burner 3 is divided into a rich pulverized coal nozzle 8 and a light pulverized coal nozzle 9 by a central partition 20. The rich pulverized coal airflow and the light pulverized coal airflow enter the furnace through the rich pulverized coal nozzle 8 and the light pulverized coal nozzle 9, respectively, for combustion. The rich pulverized coal airflow has a higher pulverized coal concentration, requires less ignition heat, and produces a higher concentration of volatiles, which facilitates ignition and stable combustion. The light pulverized coal airflow has a lower pulverized coal concentration and a higher air volume. Because the light pulverized coal nozzle 9 is located near the boiler sidewall, it reduces the impact of pulverized coal scouring on the sidewall water-cooled wall and reduces the combustion heat load on the sidewall.

[0027] The rich coal nozzles 8 and the lean coal nozzles 9 are semicircular, and the rich-side external secondary air ducts 15 and 16 are semicircular annular ducts. The rich-side external secondary air duct 15 is on the same side as the rich coal nozzle 8, and the lean-side external secondary air duct 16 is on the same side as the lean coal nozzle 9. The rich coal nozzles 8 and the lean coal nozzles 9 are respectively equipped with rich-side external secondary air damper operating levers 25 and 27. The different external secondary air volumes and swirl intensities for the rich and lean coal airflows facilitate the proper air distribution and combustion of the rich and lean coal airflows. The outermost burner 3 is a horizontal rich-lean separation burner. The pulverized coal concentrations in the rich and lean coal airflows vary significantly, so the swirl intensity of the external secondary air can be adjusted independently to accommodate these variations in pulverized coal concentration. The pulverized coal flow ejected from the rich coal nozzle 8 has a higher concentration, resulting in a correspondingly stronger external secondary air swirl intensity, which enhances the ability to entrain high-temperature flue gas and facilitates ignition and combustion of the rich coal flow. The pulverized coal flow ejected from the lean coal nozzle 9 has a lower concentration, resulting in a correspondingly weaker external secondary air swirl intensity and a larger external secondary air volume, which helps reduce the combustion heat load in the sidewall area and increase the oxygen content in the sidewall area. Furthermore, the separation of the rich and lean coal flow is achieved by an elbow 13 in the pulverized coal duct and a louvered pulverized coal concentrator 6 installed in the primary air duct 5. These two streams are injected horizontally into the furnace, with the rich coal flow entering from the side away from the sidewall and the lean coal flow from the side closer to the sidewall.

[0028] The above description is merely a preferred embodiment of the present invention and is not intended to impose any limitation on the technical solution of the present invention. Those skilled in the art should understand that, without departing from the spirit and principles of the present invention, the technical solution can also be subjected to several simple modifications and replacements, and these modifications and replacements are also within the scope of protection covered by the claims.

Claims

1. A side wall water-cooling wall protection device based on horizontal light and dark separation, characterized by: The invention comprises wall-mounted air nozzles (14) respectively arranged on both sides of the front wall (1) and the rear wall (2) of a coal-fired power station boiler, burners are arranged between the wall-mounted air nozzles (14) on both sides of the front wall (1) and the rear wall (2), and the burners include an outermost burner (3) adjacent to the wall-mounted air nozzle (14) and several other intermediate area burners (4); a shutter-type coal powder concentrator (6) is arranged in the primary air duct (5) of the outermost burner (3), and the primary air nozzle (7) of the outermost burner (3) is divided into a thick coal powder concentrator (6) and a secondary air nozzle (7) of the outermost burner (3). The pulverized coal nozzle (8) and the light pulverized coal nozzle (9) are arranged such that the side close to the burner (4) in the middle region along the width direction of the boiler is the concentrated pulverized coal nozzle (8), and the side close to the left wall (10) or the right wall (11) of the boiler is the light pulverized coal nozzle (9). The pulverized coal pipe (12) of the outermost burner (3) is introduced from the primary air duct (5) in the horizontal direction and connected to the primary air duct (5) through an elbow (13); the concentrated pulverized coal nozzle (8) and the light pulverized coal nozzle (9) can be adjusted for air distribution through independently arranged dampers; The outermost burner (3) is a swirl burner, and the burner air distribution consists of primary air, inner secondary air, thick side outer secondary air, and lean side outer secondary air; the thick side outer secondary air duct (15) and the lean side outer secondary air duct (16) of the swirl burner are semicircular annular air ducts, separated by an outer secondary air duct partition (17); the nozzles of the outermost burner (3) are respectively a primary air nozzle (7), an inner secondary air nozzle (18), and an outer secondary air nozzle (19) from the inside to the outside; the primary air nozzle (7) is a circular nozzle, and a middle partition (20) is provided in the nozzle, and the middle partition (20) divides the primary air nozzle The outlet (7) is vertically divided into a semicircular thick coal powder nozzle (8) and a light coal powder nozzle (9); the air sources of the inner secondary air, the thick side outer secondary air, and the light side outer secondary air of the outermost burner (3) are taken from the wind box (21); a fixed swirler (30) is provided in the inner secondary air duct (28) of the outermost burner (3), and the swirling intensity of the inner secondary air of the outermost burner (3) is not adjustable; an inner secondary air adjustment rod (32) is provided on the burner panel (31) of the outermost burner (3), and the amount of the inner secondary air can be adjusted by displacing the inner secondary air adjustment rod (32) along the axial direction of the burner; The rich side outer secondary air duct (15) is on the same side as the rich coal powder nozzle (8). The rich side outer secondary air volume and its swirl intensity are adjusted by the rich side impeller type damper (24) arranged tangentially on the outermost burner (3). A rich side outer secondary air door operating lever (25) is provided on the burner panel. By adjusting the deflection angle of the rich side outer secondary air door operating lever (25), the rich side impeller type damper (24) is driven to rotate, and its rotation angle is changed, so as to simultaneously adjust the rich side outer secondary air volume and the rich side outer secondary air swirl intensity. The dilute side outer secondary air duct (16) is on the same side as the dilute coal powder nozzle (9). The dilute side outer secondary air volume and its swirl intensity are adjusted by a dilute side impeller type damper (26) arranged tangentially on the outermost burner (3). A dilute side outer secondary air door operating lever (27) is provided on the burner panel (31). The dilute side outer secondary air door operating lever (27) is adjusted to rotate the dilute side impeller type damper (26) by adjusting the deflection angle of the dilute side outer secondary air door operating lever (27), thereby changing its rotation angle to simultaneously adjust the dilute side outer secondary air volume and the dilute side outer secondary air swirl intensity. The shutter-type pulverized coal concentrator (6) comprises a cavity formed by connecting a concentrator shell (22) and a middle partition (20), and concentrating blades (23) arranged in the cavity in a shutter-type manner.

2. The side wall water-cooling wall protection device based on horizontal light and dark separation according to claim 1 is characterized in that: The middle zone burner (4) is a swirl burner. The burner air distribution consists of primary air, central air, inner secondary air, and outer secondary air. The inner secondary air duct (28) and the outer secondary air duct (29) are concentric annular channels. The pulverized coal pipe (12) of the middle zone burner (4) is connected from directly below the primary air pipe (5). The wind sources of the central air, inner secondary air, and outer secondary air are taken from the wind box (21). A fixed swirl device (30) is provided in the inner secondary air duct (28) of the middle zone burner (4). The swirl intensity of the inner secondary air of the middle zone burner (4) is not adjustable. An inner secondary air adjustment rod (32) is provided on the burner panel (31) of the middle zone burner (4). The amount of the inner secondary air can be adjusted by displacing the inner secondary air adjustment rod (32) along the axial direction of the burner.

3. The side wall water-cooling wall protection device based on horizontal light-dark separation according to claim 2 is characterized in that: The air volume and swirl intensity of the external secondary air of the intermediate zone burner (4) are adjusted by an integral impeller-type damper (33) arranged tangentially on the burner, and an external secondary air damper operating lever (34) is provided on the burner panel (31) of the intermediate zone burner (4); by adjusting the deflection angle of the external secondary air damper operating lever (34), the integral impeller-type damper (33) is driven to rotate, and its rotation angle is changed, so as to simultaneously adjust the external secondary air volume and the external secondary air swirl intensity.

4. The side wall water-cooling wall protection device based on horizontal light-dark separation according to claim 1 is characterized in that: The wall-attached wind nozzle (14) is a circular nozzle, and the wall-attached wind is direct wind, and its wind source is taken from the hot primary air main pipe.

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