Device for preventing high temperature corrosion of water-cooled wall of front and back wall opposed firing boiler

Abstract

The application provides a device for preventing high-temperature corrosion of a front and back wall butt combustion boiler water cooling wall, which comprises a furnace, a burner and a side wall-attached air component. The furnace is surrounded by a front wall, a back wall and two side walls. A plurality of side wall-attached air components are arranged on the two side walls along the height direction of the side walls. Each side wall-attached air component comprises a wall-attached air mother pipe and a plurality of side wall-attached air nozzles arranged on the wall-attached air mother pipe in the transverse direction. The inlet of the side wall-attached air nozzle is connected with the wall-attached air mother pipe, the outlet of the side wall-attached air nozzle is connected with the side wall, and the side wall-attached air nozzle communicates the wall-attached air mother pipe with the inside of the furnace. The device for preventing high-temperature corrosion of a front and back wall butt combustion boiler water cooling wall can blow air from the side wall-attached air nozzle into the furnace through the side wall-attached air nozzle, form an air protection film around the side wall-attached air nozzle, prevent the accumulation of carbon monoxide, and prevent the water cooling wall located on the side wall from being corroded by high temperature.

Description

Technical Field

[0001] This invention relates to the field of front and rear wall opposed combustion boiler technology, and particularly to a device for preventing high-temperature corrosion of the water-cooled walls of a front and rear wall opposed combustion boiler. Background Technology

[0002] Opposed-wall combustion boilers are widely used in thermal power plants. Their furnaces consist of opposing front and rear walls, as well as two opposing side walls. Burners are installed on both the front and rear walls, and the inner walls of the furnace are lined with water-cooled walls. To meet nitrogen oxide emission standards, the common method is to operate the burners in an oxygen-deficient combustion state. This suppresses the production of large amounts of nitrogen oxides during pulverized coal combustion, but it also generates large amounts of carbon monoxide (CMOS) reducing gas, which mainly accumulates on the two side walls. This makes the water-cooled walls on the side walls susceptible to high-temperature corrosion. High-temperature corrosion of the water-cooled walls reduces the wall thickness of the tubes, decreasing their strength. In severe cases, it can lead to leaks and tube ruptures, impacting boiler safety. To prevent high-temperature corrosion, a common practice is to spray a coating onto the water-cooled wall surface to form a dense protective film, blocking and slowing down the reaction between the water-cooled wall and CMOS, thus reducing corrosion efficiency. However, this method suffers from complex spraying processes and limited service life.

[0003] Therefore, it is necessary to provide a device to prevent high-temperature corrosion of the water-cooled walls of a boiler with opposing front and rear walls to solve the above-mentioned technical problems. Summary of the Invention

[0004] This invention provides a device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls. It can form an air protective film on the side wall within a certain range, thereby preventing the water-cooled wall located on the side wall from being corroded by high temperature, and it is effective for a long time.

[0005] The technical solution of this invention is as follows:

[0006] A device for preventing high-temperature corrosion of the water-cooled walls of a boiler with opposing front and rear walls, comprising:

[0007] The furnace is enclosed by a front wall, a rear wall and two side walls. The inner wall of the furnace is covered with a water-cooled wall. The front wall and the rear wall are arranged opposite to each other and parallel to each other. The two side walls are arranged opposite to each other and parallel to each other. A slag discharge port is provided at the bottom of the furnace and a gas outlet is provided at the top of the furnace.

[0008] Burners, wherein burners are provided on both the front wall and the rear wall; and,

[0009] The side-mounted air assembly comprises multiple side-mounted air assemblies on both side walls, arranged along the height of the side walls. Each side-mounted air assembly includes a wall-mounted air main pipe and multiple side-mounted air nozzles. The wall-mounted air main pipe is fixed laterally to the outside of the side wall, and the multiple side-mounted air nozzles are arranged laterally on the wall-mounted air main pipe. The inlet of each side-mounted air nozzle is connected to the wall-mounted air main pipe, and the outlet of each side-mounted air nozzle is connected to the side wall. The side-mounted air nozzles communicate with the wall-mounted air main pipe and the interior of the furnace.

[0010] In the device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls according to the present invention, the side wall-mounted air nozzle includes a tapering section, a narrowing section, and a widening section connected in sequence. The inlet size of the tapering section is larger than the outlet size of the tapering section. The inlet of the tapering section is connected to the wall-mounted air main pipe. The narrowing section is a straight section. The outlet size of the widening section is larger than the inlet size of the widening section. The outlet of the widening section is connected to the side wall.

[0011] In the device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls as described in this invention, the gradually expanding section is inclined, and the outlet of the gradually expanding section is higher than the inlet of the gradually expanding section.

[0012] In the device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls as described in this invention, the angle between the gradually expanding section and the side wall is 15° to 45°.

[0013] In the device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls according to the present invention, a flow guiding structure is provided in the expanding section. The flow guiding structure includes two mutually symmetrical first flow guiding plates, which are arranged along the width direction of the expanding section. The outlet size of the flow guiding structure is larger than its inlet size.

[0014] In the device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls as described in this invention, the flow guiding structure is configured in multiple groups. The two outermost first flow guiding plates extend into the furnace, and their outlet portions near the gradually expanding section bend outward to form a bent section. The bent section is spaced apart from and parallel to the side wall.

[0015] In the device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls according to the present invention, the side wall includes multiple first areas, multiple second areas, a third area and multiple fourth areas; the first area is the area that can be covered by the row of side wall-mounted air nozzles by spraying air to the left and right sides and upwards, the second area is located above the first area, the third area is located below the lowest first area, and the fourth area is located on both sides of the first area.

[0016] The front wall includes two fifth regions, which are the regions between the row of burners and the side wall near the side wall;

[0017] The device for preventing high-temperature corrosion of the water-cooled walls of a boiler with opposing front and rear walls further includes four corner wall-mounted air assemblies. Each corner wall-mounted air assembly is located at one of the four corners of the furnace. Each assembly includes an air duct and multiple corner wall-mounted air nozzles. The air duct is vertically positioned outside the corner of the furnace, and the multiple corner wall-mounted air nozzles are vertically positioned on the air duct. The inlet of each nozzle is connected to the air duct, and the outlet extends into the interior of the furnace. Each nozzle has a first nozzle and a second nozzle. The first nozzle is located on the vertical edge of the side wall, and its orientation is parallel to the side wall. The first nozzle is located at locations corresponding to the second, third, and fourth regions. The second nozzle is located on the vertical edge of the front or rear wall, and its orientation is parallel to the front or rear wall. The second nozzle is located at a location corresponding to the fifth region.

[0018] In the device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls as described in this invention, the outlet area of ​​the first nozzle is larger than the outlet area of ​​the second nozzle.

[0019] In the device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls as described in this invention, a plurality of second guide plates are provided in both the first nozzle and the second nozzle. The plurality of second guide plates are arranged in parallel vertically. The second guide plates are inclined, with the end of the second guide plate away from the air duct being higher than the end near the air duct. The inclination angle of the second guide plate with respect to the horizontal plane is 15°-45°.

[0020] In the device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls as described in this invention, each of the first nozzles is equipped with a valve for adjusting the gas volume.

[0021] Compared with the prior art, the beneficial effects of this invention are as follows: The device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls in this invention blows air into the furnace from the side wall through the wall-mounted air main pipe and the side wall-mounted air nozzles. An air protective film can be formed around the side wall-mounted air nozzles to prevent the accumulation of carbon monoxide. Multiple side wall-mounted air nozzles on each side wall-mounted air assembly are arranged laterally on the side wall, and multiple side wall-mounted air assemblies are arranged longitudinally on the side wall. This allows an air protective film to be formed within a certain range of the side wall, thereby preventing the water-cooled wall located on the side wall from being corroded by high temperature, and the effect is long-lasting and effective. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments are briefly introduced below. The drawings described below are only the corresponding drawings of some embodiments of the present invention.

[0023] Figure 1 This is a three-dimensional structural schematic diagram of a device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls, provided in a preferred embodiment of the present invention.

[0024] Figure 2 for Figure 1 A magnified structural diagram of part A in the middle.

[0025] Figure 3 for Figure 1 A magnified structural diagram of part B.

[0026] Figure 4 This is a top view of a device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls, provided in a preferred embodiment of the present invention (the dashed arrows in the figure indicate the direction of airflow).

[0027] Figure 5 for Figure 4 A magnified structural diagram of section C.

[0028] Figure 6 for Figure 4 A magnified structural diagram of part D in the middle.

[0029] Figure 7 This is a schematic diagram of another angle of the device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls, provided in a preferred embodiment of the present invention.

[0030] Figure 8 A schematic diagram of the side wall-mounted air nozzle of the device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls, provided in a preferred embodiment of the present invention.

[0031] Figure 9 This is a side view of the side-mounted air nozzle of the device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls, provided in a preferred embodiment of the present invention.

[0032] Figure 10 This is a schematic diagram of the side wall structure of the device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls, provided in a preferred embodiment of the present invention.

[0033] Figure 11 This is a schematic diagram of the front wall structure of the device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls, provided in a preferred embodiment of the present invention.

[0034] Figure 12The carbon monoxide concentration distribution on the sidewalls of a boiler water-cooled wall device designed to prevent high-temperature corrosion of the front and rear walls without the addition of side-mounted and corner-mounted air-cooling components.

[0035] Figure 13 The carbon monoxide concentration distribution on the sidewall of a boiler water-cooled wall device with added side-mounted air assembly to prevent high-temperature corrosion of the front and rear walls in an opposing combustion environment.

[0036] in,

[0037] 11. Furnace chamber

[0038] 111, Front Wall, 1111, Fifth Zone,

[0039] 112. Back wall,

[0040] 113. Side wall; 1131. First area; 1132. Second area; 1133. Third area; 1134. Fourth area.

[0041] 114. Slag discharge port,

[0042] 115. Air vent

[0043] 12. Burner

[0044] 13. Side-mounted wall-mounted fan assembly.

[0045] 131. Wall-mounted air duct,

[0046] 132. Side-mounted wall-mounted air nozzle,

[0047] 1321. Gradual contraction section.

[0048] 1322, Narrowing section,

[0049] 1323, Gradual Expansion Section

[0050] 1324. Flow guiding structure; 13241. First flow guiding plate; 13242. Bend section.

[0051] 14. Corner wall-mounted fan assembly; 141. Air duct; 142. Corner wall-mounted fan nozzle; 1421. First nozzle; 1422. Second nozzle; 1423. Second guide plate.

[0052] 15. Bellows.

[0053] In the diagram, units with similar structures are represented by the same labels. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] The directional terms mentioned in this invention, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", "top" and "bottom", are only for reference to the orientation of the accompanying drawings. The directional terms used are for the purpose of explaining and understanding this invention, and are not intended to limit this invention.

[0056] The terms "first" and "second" used in the terminology of this invention are for descriptive purposes only and should not be construed as indicating or implying relative importance, nor as limiting the order of events.

[0057] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0058] To prevent high-temperature corrosion of water-cooled walls, a common practice is to spray a coating on the surface of the water-cooled wall to form a dense protective film, which blocks and slows down the reaction between the water-cooled wall and carbon monoxide, thereby reducing the corrosion efficiency of the water-cooled wall. However, this method has technical problems such as complex spraying process and limited service life.

[0059] The following is a preferred embodiment of a device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls, which can solve the above-mentioned technical problems provided by the present invention.

[0060] Please refer to Figure 1 and Figure 7A preferred embodiment of the present invention provides a device for preventing high-temperature corrosion of the water-cooled walls of a boiler with opposing front and rear walls, comprising a furnace 11, burners 12, and side-wall-attached air assemblies 13. The furnace 11 is enclosed by a front wall 111, a rear wall 112, and two side walls 113. The inner wall of the furnace 11 is covered with a water-cooled wall. The front wall 111 and rear wall 112 are arranged opposite to each other and parallel to each other, as are the two side walls 113. A slag discharge port 114 is provided at the bottom of the furnace 11, and a gas outlet 115 is provided at the top of the furnace 11. Multiple burners 12 are arranged longitudinally and vertically on both the front wall 111 and the rear wall 112. Multiple side-wall-attached air assemblies 13 are arranged on each of the two side walls 113, and the multiple side-wall-attached air assemblies 13 are arranged along the height direction of the side walls 113. Each side-mounted air assembly 13 includes a side-mounted air header 131 and multiple side-mounted air nozzles 132. The side-mounted air header 131 is fixed laterally to the outside of the side wall 113, and the multiple side-mounted air nozzles 132 are arranged laterally on the side-mounted air header 131. The inlet of the side-mounted air nozzle 132 is connected to the side-mounted air header 131, and the outlet of the side-mounted air nozzle 132 is connected to the side wall 113. The side-mounted air nozzle 132 connects the side-mounted air header 131 and the interior of the furnace 11. Air boxes 15 are also provided on the outside of the front wall 111 and the rear wall 112, and the air boxes 15 are connected to both the burner 12 and the side-mounted air header 131.

[0061] The present invention provides a device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls. Air is blown into the furnace 11 from the side wall 113 via the wall-mounted air main pipe 131 and the side wall-mounted air nozzles 132. An air protective film can be formed around the side wall-mounted air nozzles 132 to prevent the accumulation of carbon monoxide. Multiple side wall-mounted air nozzles 132 on each side wall-mounted air assembly 13 are arranged laterally on the side wall 113, and multiple side wall-mounted air assemblies 13 are arranged longitudinally on the side wall 113. This allows an air protective film to be formed within a certain range of the side wall, thereby preventing the water-cooled wall located on the side wall 113 from being corroded by high temperature, and the effect is long-lasting.

[0062] Please refer to Figure 2 The side-mounted wall-mounted air nozzle 132 includes a tapered section 1321, a constricted section 1322, and a expanding section 1323 connected in sequence. The inlet size of the tapered section 1321 is larger than its outlet size, and the inlet of the tapered section 1321 is connected to the wall-mounted air duct 131. The constricted section 1322 is a straight section. The outlet size of the expanding section 1323 is larger than its inlet size, and the outlet of the expanding section 1323 is connected to the side wall 113. In this structure, the side-mounted wall-mounted air nozzle 132 is designed as an irregularly shaped venturi tube, which allows for uniform air output from the expanding section 1323 even when the air volume delivered by the wall-mounted air duct 131 is small. The straight section of the constricted section 1322 further stabilizes the airflow velocity.

[0063] Please refer to Figure 9 The diffuser section 1323 is inclined, and the outlet of the diffuser section 1323 is higher than the inlet of the diffuser section 1323. With this structure, some air can be ejected towards the outlet of the diffuser section 1323, which maximizes the coverage of the air when the number of side wall-mounted air nozzles 132 is small, and the air is ejected towards the outlet 115, which can follow the direction of the airflow.

[0064] Please continue to refer to Figure 9 The angle α between the expanding section 1323 and the side wall 113 is between 15° and 45°. If the angle α between the expanding section 1323 and the side wall 113 is too small, the turning angle of the air after exiting the constriction section 1322 will be large, resulting in insufficient air delivery; if the angle α between the expanding section 1323 and the side wall 113 is too large, the amount of air ejected towards the outlet of the expanding section 1323 will be small, and the air coverage area will be insufficient. In the above structure, the angle α between the expanding section 1323 and the side wall 113 is between 15° and 45°, which ensures both smooth air delivery and a large air coverage area. In this embodiment, the angle α between the expanding section 1323 and the side wall 113 is 30°.

[0065] Please refer to Figure 8 A flow guiding structure 1324 is provided within the expanding section 1323. The flow guiding structure 1324 includes two symmetrical first flow guiding plates 13241, which are arranged along the width direction of the expanding section 1323. The outlet size of the flow guiding structure 1324 is larger than its inlet size. In the above structure, the two first flow guiding plates 13241 form a V-shape, dividing the expanding section 1323 into multiple transversely arranged channels, which can make the air delivery uniform and the delivery range along the lateral direction larger.

[0066] Please continue to refer to Figure 8 and combined Figure 4 and Figure 6 The flow guiding structure 1324 is configured in multiple sets. The two outermost first flow guiding plates 13241 extend into the furnace 11, and their outlet portions near the gradually expanding section 1323 bend outward to form a bent section 13242. The bent section 13242 is spaced apart from and parallel to the side wall 113. In the above structure, the bent section 13242 allows some air to be closer to the water-cooled wall, resulting in a larger lateral air delivery range. In this embodiment, the distance between the bent section 13242 and the side wall 113 is 200mm.

[0067] Please refer to Figure 4 , Figure 5 , Figure 10 and 11The side wall 113 includes multiple first regions 1131, multiple second regions 1132, one third region 1133, and multiple fourth regions 1134. The first region 1131 is the area covered by a row of side-mounted air nozzles 132 that spray air to the left, right, and upward. The second region 1132 is located above the first region 1131. The third region 1133 is located below the lowest first region 1131. The fourth regions 1134 are located on either side of the first region 1131. In this embodiment, there are three first regions 1131, three second regions 1132, and six fourth regions 1134. The front wall 111 includes two fifth regions 1111, which are the areas between a row of burners 12 near the side wall 113 and the side wall 113, i.e., the two vertical edges of the front wall 111.

[0068] The device for preventing high-temperature corrosion of the water-cooled walls of a boiler with opposing front and rear walls also includes four corner wall-mounted air assemblies 14, one of which is installed at each of the four corners of the furnace 11. Each corner wall-mounted air assembly 14 includes an air duct 141 and multiple corner wall-mounted air nozzles 142. The air duct 141 is vertically positioned outside the corner of the furnace 11 and communicates with the air box 15. The multiple corner wall-mounted air nozzles 142 are vertically positioned on the air duct 141. The inlet of each corner wall-mounted air nozzle 142 is connected to the air duct 141, and the outlet extends into the interior of the furnace 11. Each corner wall-mounted air nozzle 142 has a first nozzle 1421 and a second nozzle 1422. The first nozzle 1421 is located at the vertical edge of the side wall 113, and its orientation is parallel to the side wall 113. First nozzles 142 are installed at locations corresponding to the second region 1132, the third region 1133, and the fourth region 1134. The second nozzle 1422 is located at the vertical edge of the front wall 111 or the rear wall 112. The orientation of the second nozzle 1422 is parallel to the front wall 111 or the rear wall 112. The second nozzle 1422 is provided at the location corresponding to the fifth region 1111.

[0069] The second region 1132 is located above the first region 1131. Because it is far from the side-mounted air nozzle 132, air is not easily reached in this region. The third region 1133 is located below the lowest first region 1131. Since the side-mounted air nozzle 132 does not spray air downwards, air cannot reach this region. The fourth region 1134 is located on both sides of the first region 1131. Air ejected from the side-mounted air nozzle 132 is not easily reached in this region. First nozzles 1421 are installed at locations corresponding to the second, third, and fourth regions 1132 and 1134, allowing an air protective film to form in these regions.

[0070] The fifth region 1111 also has a high carbon monoxide concentration and is prone to corrosion. The second nozzle 1422 is oriented parallel to the front wall 111, which allows an air protective film to form in the fifth region 1111. The structure of the rear wall 112 is similar to that of the front wall 111, and will not be described in detail here.

[0071] Because the areas of the third region 1133 and the fourth region 1134, and the second region 1132 and the fourth region 1134, differ significantly, each of the first nozzles 1421 is equipped with a valve for adjusting the air volume to ensure that the gas ejected from each region's first nozzle 1421 effectively covers the corresponding area (first nozzles 1421 located at the same outer corner are all connected to the same air duct 141). The second region 1132 and the third region 1133 both extend laterally, allowing for larger valves on the first nozzles 1421 corresponding to these two regions. The fourth region 1134 has a smaller lateral width, allowing for smaller valves on the first nozzles 1421 corresponding to this region, thus effectively distributing the airflow through the air duct 141.

[0072] Please continue to refer to Figure 5 , Figure 9 and Figure 10 Because the width of the fourth region 1134 is greater than the width of the fifth region 1111, and the carbon monoxide concentration of the sidewall 113 is greater than the carbon monoxide concentration of the edge regions of the front wall 111 and the rear wall 112, the outlet area of ​​the first nozzle 1421 is greater than the outlet area of ​​the second nozzle 1422. Using this structure, airflow can be effectively distributed.

[0073] Please continue to refer to Figure 5 The outlet area of ​​the first nozzle 1421 is 1 / 2 to 4 / 5 of the outlet area of ​​the corner-mounted air nozzle 142, and the outlet area of ​​the second nozzle 1422 is 1 / 5 to 1 / 2 of the outlet area of ​​the corner-mounted air nozzle 142. With this structure, the outlet areas of the first nozzle 1421 and the second nozzle 1422 correspond to the carbon monoxide concentration in different areas, thus allowing for more accurate airflow distribution. In this embodiment, the outlet area of ​​the first nozzle 1421 is 2 / 3 of the corner-mounted air nozzle 142, and the outlet area of ​​the second nozzle 1422 is 1 / 3 of the corner-mounted air nozzle 142.

[0074] Please refer to Figure 3 At the same time, please combine Figure 5Each of the first nozzle 1421 and the second nozzle 1422 is provided with multiple second guide vanes 1423. These second guide vanes 1423 are arranged vertically in parallel and are inclined, with the end of each second guide vane 1423 furthest from the air duct 141 higher than the end closest to the air duct 141. The inclination angle of each second guide vane 1423 to the horizontal plane is 15°-45°. In this structure, the second guide vanes 1423 allow the first nozzle 1421 and the second nozzle 1422 to form multiple channels vertically, resulting in more uniform airflow from the first nozzle 1421 and the second nozzle 1422 and a larger vertical coverage area. The inclined arrangement of the second guide vanes 1423 causes some of the airflow from the first nozzle 1421 and the second nozzle 1422 to face upwards, thereby expanding the air coverage area and conforming to the direction of airflow. When the tilt angle of the second guide vane 1423 to the horizontal plane is too small, almost all the air ejected by the first nozzle 1421 and the second nozzle 1422 is ejected horizontally, resulting in a small vertical coverage area. When the tilt angle of the second guide vane 1423 to the horizontal plane is too large, most of the air ejected by the first nozzle 1421 and the second nozzle 1422 is ejected upwards, resulting in insufficient horizontal range for the first nozzle 1421 and the second nozzle 1422. A tilt angle of 15°-45° between the second guide vane 1423 and the horizontal plane allows for a large vertical air coverage area without affecting the horizontal range of the first nozzle 1421 and the second nozzle 1422. In this embodiment, the tilt angle of the second guide vane 1423 to the horizontal plane is 30°.

[0075] The working principle of the device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls according to a preferred embodiment of the present invention is as follows:

[0076] 1. Side-wall-attached air assembly 13: Air is evenly transported into the furnace 11 via the side-wall-attached air main pipe 131, the tapering section 1321, the narrowing section 1322, and the expanding section 1323; the expanding section 1323 is inclined, so that the air ejected from the side-wall-attached air nozzle 132 can cover the top of the side-wall-attached air nozzle 132; multiple sets of flow guiding structures 1324 are provided inside the expanding section 1323, and the two outermost first flow guiding plates 13241 are provided with bending sections 13242, so that the air ejected from the side-wall-attached air nozzle 132 can cover the lateral sides of the side-wall-attached air nozzle 132; Figure 12 and Figure 13 By comparison, it can be seen that after adding the side wall-mounted air component 13, the carbon monoxide concentration in most areas of the side wall 113 is significantly reduced.

[0077] 2. Corner wall-mounted air assembly 14: The air ejected by the first nozzle 1421 can replenish the second area 1132, the third area 1133 and the fourth area 1134; the air ejected by the second nozzle 1422 can replenish the fifth area 1111.

[0078] The air volume of the side-mounted wall fan assembly 13 and the corner-mounted wall fan assembly 14 is 3%-8% of the total air volume, with the side-mounted wall fan assembly 13 accounting for approximately 60%-70% and the corner-mounted wall fan assembly 14 accounting for approximately 30%-40%. The side-mounted wall fan assembly 13 can prevent corrosion in approximately 70%-80% of the side wall 113; the corner-mounted wall fan assembly 14 can supplement the remaining 20%-30% of the side wall 113 to prevent corrosion.

[0079] This is the working principle of the front and rear wall opposed combustion boiler in this preferred embodiment.

[0080] The present invention relates to a device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls. Air is blown into the furnace from the side wall through the wall-mounted air main pipe and the side wall-mounted air nozzles. An air protective film can be formed around the side wall-mounted air nozzles to prevent the accumulation of carbon monoxide. Multiple side wall-mounted air nozzles on each side wall-mounted air assembly are arranged laterally on the side wall, and multiple side wall-mounted air assemblies are arranged longitudinally on the side wall. This allows an air protective film to be formed within a certain range of the side wall, thereby preventing the water-cooled wall located on the side wall from being corroded by high temperature, and the effect is long-lasting and effective.

[0081] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the concept of the technical solution of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for preventing high-temperature corrosion of the water-cooled walls of a boiler with opposing front and rear walls, characterized in that, include: The furnace is enclosed by a front wall, a rear wall and two side walls. The inner wall of the furnace is covered with a water-cooled wall. The front wall and the rear wall are arranged opposite to each other and parallel to each other. The two side walls are arranged opposite to each other and parallel to each other. A slag discharge port is provided at the bottom of the furnace and a gas outlet is provided at the top of the furnace. Burners, wherein burners are provided on both the front wall and the rear wall; and, A side-mounted air assembly is provided on each of the two side walls. The side-mounted air assemblies are arranged along the height direction of the side walls. Each side-mounted air assembly includes a wall-mounted air main pipe and multiple side-mounted air nozzles. The wall-mounted air main pipe is fixed to the outside of the side wall in a horizontal direction. The multiple side-mounted air nozzles are arranged on the wall-mounted air main pipe in a horizontal direction. The inlet of the side-mounted air nozzle is connected to the wall-mounted air main pipe, and the outlet of the side-mounted air nozzle is connected to the side wall. The side-mounted air nozzles communicate with the wall-mounted air main pipe and the interior of the furnace. The side wall-mounted air nozzle includes a tapering section, a narrowing section, and a widening section connected in sequence. The inlet size of the tapering section is larger than the outlet size of the tapering section. The inlet of the tapering section is connected to the wall-mounted air main pipe. The narrowing section is a straight section. The outlet size of the widening section is larger than the inlet size of the widening section. The outlet of the widening section is connected to the side wall. The expanding section is inclined, and the outlet of the expanding section is higher than the inlet of the expanding section; The angle between the expanding section and the sidewall is 15° to 45°. The expanding section is provided with a flow guiding structure, which includes two symmetrical first flow guiding plates. The two first flow guiding plates are arranged along the width direction of the expanding section, and the outlet size of the flow guiding structure is larger than its inlet size. The flow guiding structure is configured in multiple groups. The two outermost first flow guiding plates extend into the furnace. The portion of the first flow guiding plate near the outlet of the gradually expanding section bends outward to form a bent section. The bent section is spaced apart from and parallel to the side wall. The distance between the bent section and the side wall is 200mm. The sidewall includes multiple first areas, multiple second areas, a third area, and multiple fourth areas; the first area is the area that can be covered by the row of side wall-mounted air nozzles by spraying air to the left and right sides and upwards; the second area is located above the first area; the third area is located below the lowest first area; and the fourth area is located on both sides of the first area. The front wall includes two fifth regions, which are the regions between the row of burners and the side wall near the side wall; The device for preventing high-temperature corrosion of the water-cooled walls of a boiler with opposing front and rear walls further includes four corner wall-mounted air assemblies. One corner wall-mounted air assembly is installed at each of the four corners of the furnace. Each corner wall-mounted air assembly includes an air duct and multiple corner wall-mounted air nozzles. The air duct is vertically positioned outside the corner of the furnace, and the multiple corner wall-mounted air nozzles are vertically positioned on the air duct. The inlet of each corner wall-mounted air nozzle is connected to the air duct, and the outlet of each corner wall-mounted air nozzle extends into the interior of the furnace. Each corner wall-mounted air nozzle is equipped with a first nozzle and a second nozzle. The first nozzle is located at the vertical edge of the side wall, and its orientation is parallel to the side wall. The first nozzle is installed at locations corresponding to the second, third, and fourth regions, forming an air protective film in these regions. The second nozzle is located at the vertical edge of the front or rear wall, and its orientation is parallel to the front or rear wall. The second nozzle is installed at locations corresponding to the fifth region, forming an air protective film in the fifth region.

2. The device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls as described in claim 1, characterized in that, The outlet area of ​​the first nozzle is larger than the outlet area of ​​the second nozzle.

3. The device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls as described in claim 1, characterized in that, Both the first nozzle and the second nozzle are provided with a plurality of second guide plates, which are arranged in parallel vertically. The second guide plates are inclined, with the end of the second guide plate away from the air duct being higher than the end near the air duct. The inclination angle of the second guide plate with respect to the horizontal plane is 15°-45°.

4. The device for preventing high-temperature corrosion of the water-cooled wall of a boiler with opposing front and rear walls as described in claim 1, characterized in that, Each of the first nozzles is equipped with a valve for adjusting the gas volume.

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