Header system of coal-fired boiler and coal-fired boiler

Abstract

According to the header system of the coal-fired boiler and the coal-fired boiler, the thermal stress of the header can be improved, and the service life of the header can be prolonged. The header system of the coal-fired boiler comprises second headers, at least one first header and a plurality of sets of pipe rows, one end of each set of pipe rows penetrates through a boiler wall of the coal-fired boiler, and the other end of each set of pipe rows is connected with one second header; and the first header is connected with the plurality of second headers.

Description

Technical Field

[0001] The present application relates to the technical field of coal-fired power generation, and in particular to a header system of a coal-fired boiler and a coal-fired boiler. Background Art

[0002] Coal-fired boilers are equipped with a header and multiple tube banks. Each tube bank connects to the boiler's flue at one end and to the header at the other. This allows the working fluid (e.g., steam) heated by the flue bank to be introduced into the header, where it is mixed evenly before being transported to the next level of equipment. However, with increasing market demand for frequent peak shaving, rapid load changes, and ultra-low load operation of coal-fired generators, the fatigue life of the current header system is short. Utility Model Content

[0003] The purpose of the present application is to provide a header system for a coal-fired boiler and a coal-fired boiler, which can improve the thermal stress of the header and increase the service life of the header.

[0004] In order to solve the above technical problems, the coal-fired boiler header system provided in the present application includes a second header, at least one first header and multiple groups of tube banks, one end of each group of tube banks passes through the furnace wall of the coal-fired boiler, and the other end of each group of tube banks is connected to one second header; the first header is connected to multiple second headers.

[0005] Optionally, the plurality of tube rows are arranged in a horizontal direction or a vertical direction, and the first header and the second header are perpendicular to each other.

[0006] Optionally, a connecting pipe is further included, and each of the second headers is connected to the first header via the corresponding connecting pipe, and the connecting pipe includes a bent pipe section.

[0007] Optionally, it further comprises a limiting device and a rooting piece connected to the furnace wall, wherein the limiting device is connected to the rooting piece;

[0008] The limiting device includes a first plate portion and a second plate portion arranged opposite to each other, and the second plate portion is closer to the rooting piece relative to the first plate portion; the first collecting box is located between the first plate portion and the second plate portion, and in the arrangement direction of the first plate portion and the second plate portion, there is a gap between the first collecting box and the first plate portion and the second plate portion.

[0009] Optionally, the limiting device also includes a third plate portion and a fourth plate portion that are arranged opposite to each other, the third plate portion connects one end of the first plate portion and the second plate portion, and the fourth plate portion connects the other end of the first plate portion and the second plate portion; the first plate portion, the second plate portion, the third plate portion, and the fourth plate portion are enclosed into an annular frame, and the first collecting box passes through the annular frame.

[0010] Optionally, the limiting device further includes a connecting plate, which connects the annular frame and the rooting member.

[0011] Optionally, each group of the tube rows includes a first tube row segment, a second tube row segment, and a third tube row segment connecting the first tube row segment and the second tube row segment; the extension direction of the first tube row segment is perpendicular to the extension direction of the second tube row segment, and the third tube row segment is an arc-shaped tube row segment;

[0012] The first tube bank section is used to pass through the furnace wall, and the second tube bank section is connected to the first header.

[0013] Optionally, a connecting pipe is further included, and each of the second headers is connected to the first header via the corresponding connecting pipe, and the connecting pipe is a straight pipe.

[0014] Optionally, each group of the tube rows includes multiple tubes, and the multiple tubes are arranged along the length direction of the corresponding second header; among two adjacent tubes in each group of the tube rows, the connection position between one tube and the second header and the connection position between the other tube and the second header are staggered in a length direction perpendicular to the second header.

[0015] The present application also provides a coal-fired boiler, comprising a furnace wall and a header system of any one of the above-mentioned coal-fired boilers.

[0016] The coal-fired boiler header system in this application employs multiple secondary headers for transitional mixing between the primary header and multiple tube banks. This allows for small-scale mixing of the working fluid before it enters the primary header. This reduces or even eliminates thermal stress in the primary header caused by temperature deviations between tube banks, thereby reducing fatigue and increasing service life. The coal-fired boiler provided in this application achieves the same technical benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of a first embodiment of a header system for a coal-fired boiler of the present application;

[0018] Figure 2 for Figure 1 A top view of

[0019] Figure 3 for Figure 2 Enlarged view of part A in the middle;

[0020] Figure 4 This is a schematic diagram of a connecting hole provided on the second header of the header system of the coal-fired boiler of the present application;

[0021] Figure 5This is a structural schematic diagram of a second embodiment of a header system for a coal-fired boiler of the present application;

[0022] Figure 6 for Figure 5 Middle BB section view;

[0023] Figure 7 for Figure 5 Top view of .

[0024] The following are the descriptions of the reference numerals:

[0025] 100-furnace wall;

[0026] 200-header system;

[0027] 201-first collecting box; 202-second collecting box; 202a-connecting hole; 203-tube row; 2031-pipeline; 2031a-pipe joint; 203a-first tube row section; 203b-second tube row section; 203c-third tube row section; 204-connecting pipe; 2041-vertical pipe section; 2042-bent pipe section; 2043-horizontal pipe section; 205-rooting piece; 206-limiting device; 2061-first plate portion; 2062-second plate portion; 2063-third plate portion; 2064-fourth plate portion; 2065-connecting plate. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0030] Please refer to Figure 1 、 2 , Figure 1 This is a structural diagram of a first embodiment of a header system 200 for a coal-fired boiler of the present application; Figure 2 for Figure 1 Top view of . Figure 1 is the horizontal viewing angle, Figure 2 The vertical viewing angle.

[0031] This embodiment provides a header system 200 for a coal-fired boiler. The header system 200 includes multiple groups of tube banks 203. Pipes 2031 in the tube banks 203 can flow working fluid. One end of each group of tube banks 203 can pass through the furnace wall 100 of the coal-fired boiler, that is, each group of tube banks 203 can be connected to the tube banks in the flue of the coal-fired boiler. The high-temperature flue gas generated in the flue or furnace can heat the working fluid (such as steam) in the tube banks in the flue. The working fluid can enter the pipes 2031 of the tube banks 203 of the header system 200, and the tube banks 203 transport the working fluid to the next-level equipment that requires the working fluid, such as a reheater.

[0032] The header system 200 in this embodiment also includes at least one first header 201 and a plurality of second headers 202. Each group of tube banks 203 has one end extending through the furnace wall 100 and the other end connected to a second header 202. Each first header 201 is connected to multiple second headers 202. That is, after entering the tube banks 203, the working fluid first enters the multiple second headers 202 and then enters the first header 201 from the multiple second headers 202. If only one first header 201 is provided, all second headers 202 are connected to this single first header 201. If more than one first header 201 is provided, all second headers 202 are divided into multiple groups, with each group of multiple first headers 201 connected to a corresponding first header 201. In other words, the second header 202 serves as a header for the pipelines 2031, while the first header 201 serves as a header for the second headers 202.

[0033] Since each second header 202 is only connected to one group of pipe banks 203, the first header 201 is connected to multiple second headers 202, which means that the capacity of the first header 201 must meet the flow requirements of multiple or all of the pipe banks 203. Therefore, the first header 201 can be set to have a larger volume than the second header 202, that is, the first header 201 is a large header and the second header 202 is a small header. Figure 1 、 2 It can be seen that the first collection box 201 and the second collection box 202 are both circular tubes. The diameter of the first collection box 201 is greater than the diameter of the second collection box 202, and the length can also be greater than the length of the second collection box 202. Of course, the structural form of the first collection box 201 and the second collection box 202 is not limited to circular tubes, for example, they can also be square boxes, etc.

[0034] With this arrangement, each tube bank 203 is first connected to the second manifold 202 , so that the working fluid in each tube bank 203 is first mixed in the second manifold 202 and then enters the first manifold 201 , and can be finally mixed again with the working fluid in other tube banks 203 in the first manifold 201 . It should be noted that the working fluid in each pipe 2031 of each group of tube banks 203 is heated differently, resulting in a large temperature difference and a rapid change rate, especially in a super-flexible coal-fired boiler. Therefore, the temperature difference between each group of tube banks 203 is also relatively large. If multiple groups of tube banks 203 are directly connected to the first header 201, due to the temperature difference, thermal stress will exist at the connection position between the first header 201 and the multiple groups of tube banks 203. The inventors have found that this is also an important reason for the fatigue and life-span impact mentioned in the background technology. In this embodiment, multiple second headers 202 are used between the first header 201 and the multiple groups of tube banks 203 for transition mixing. The working fluid is first mixed in a small range before entering the first header 201. This can reduce or even eliminate the thermal stress in the first header 201 caused by the temperature deviation between the tube banks 203, thereby reducing the fatigue of the first header 201 and improving the service life. Although the second headers 202 are directly connected to the tube banks 203 , each second header 202 is only connected to one group of tube banks 203 , so the temperature difference and work quality are relatively small, and the thermal stress of the second headers 202 can be controlled.

[0035] In addition, in this embodiment, the through-wall connection between each group of tube rows 203 and the furnace wall 100 is a slidable connection. For example, a connecting seat can be fixed on the furnace wall 100, and a pipe joint 2031a is provided at the end of the tube row 203. The pipe joint 2031a passes through the connecting seat and is slidably sealed with the connecting seat. Specifically, the connecting seat can be provided with a clamping hole adapted to each pipe 2031 in each group of tube rows 203, and a sliding seal is provided between the hole wall of the clamping hole and the pipe 2031. In this way, each group of tube rows 203 and the furnace wall 100 can slide relative to each other, that is, slide relative to each other along the front-to-back direction of the furnace wall 100. The front-to-back direction of the furnace wall 100 is also the thickness direction of the furnace wall 100. Figure 1 Such an arrangement can not only prevent smoke from leaking from the inside to the outside of the furnace wall 100 , but also further reduce or eliminate the structural stress caused by the temperature difference between the second header 202 and the tube bank 203 .

[0036] like Figure 1 、 2 As shown, the multiple tube rows 203 in this embodiment are arranged in the horizontal direction. Figure 2 Only two groups of pipe banks 203 are shown in the figure. It can be seen that the number of pipe banks 203 is not limited and there can be more groups. Each group of pipe banks 203 includes multiple pipes 2031. Figure 1Each pipe 2031 also extends horizontally and is a generally straight pipe. The multiple pipes 2031 in each pipe row 203 are arranged vertically. In this case, the second header 202 extends vertically, while the first header 201 extends horizontally. That is, the first and second headers 201, 202 are perpendicular to each other. While the second header 202 extends vertically, the first header 201 extends horizontally, facilitating connection with multiple horizontally arranged second headers 202.

[0037] The first header 201 can be suspended above the plurality of second headers 202, for example, by being suspended from the ceiling of the boiler room via a hanging assembly. Furthermore, compared to the second headers 202, the first header 201 can be further away from the furnace wall 100, i.e., the first header 201 is located diagonally above the plurality of second headers 202. This further reduces the impact of furnace temperature on the first header 201 and reduces interference with other equipment on the furnace wall 100. Of course, the first header 201 can also be supported on the ground, other platforms, or other equipment.

[0038] At this time, the header system 200 may further include a connecting pipe 204. Each second header 202 is connected to the first header 201 via a corresponding connecting pipe 204. It is worth noting that Figure 1 The connecting pipe 204 in the embodiment includes a bent pipe section, a spoon-shaped connecting pipe 204. Thus, each second header 202 is connected to the first header 201 via the bent connecting pipe 204. Specifically, each connecting pipe 204 includes a horizontal pipe section 2043, a vertical pipe section 2041, and a bent pipe section 2042. The horizontal pipe section 2043 is connected to the second header 202, the vertical pipe section 2041 is connected to the bottom of the first header 201, and the bent pipe section 2042 connects the horizontal pipe section 2043 and the vertical pipe section 2041. Thus, the long length and bent portion of the connecting pipe 204 can absorb deformation, thereby reducing the structural stress between the second header 202 and the first header 201. Figure 1 The bent pipe section 2042 includes an arc-shaped pipe section and an inclined straight pipe section. The inclined straight pipe section is bent toward the side close to the furnace wall 100 and then connected to the vertical pipe section 2041. This spoon-shaped design can effectively absorb and consume the deformation at the position of the bent pipe section 2042, thereby reducing structural stress.

[0039] In addition, the header system 200 in this embodiment further includes a limiting device 206 and a rooting member 205 connected to the furnace wall 100, and the limiting device 206 is connected to the rooting member 205. The rooting member 205 is a component fixed to the furnace wall 100 by hooking or other means. Figure 1The connection structure between the rooting member 205 and the furnace wall 100 is not shown. The rooting member 205 can move forward and backward with the furnace wall 100. The installation of the rooting member 205 contributes to the stability of the furnace wall 100. The specific structure of the rooting member 205 is not discussed here. The position limiting device 206 is connected to the rooting member 205, and the position of the position limiting device 206 and the furnace wall 100 is determined. As long as the position of the position limiting device 206 is stable, the position limiting device 206 can limit the first header 201.

[0040] Specifically, if Figure 1 As shown, the limiting device 206 includes a first plate portion 2061 and a second plate portion 2062 arranged opposite each other. The thickness of the first plate portion 2061 and the second plate portion 2062 is horizontal. In addition, the second plate portion 2062 is closer to the rooting member 205 than the first plate portion 2061. At this time, the first manifold 201 is located between the first plate portion 2061 and the second plate portion 2062, and a gap exists between the first manifold 201 and the first and second plates 2061, 2062 in the arrangement direction of the first and second plates 2061, 2062. In this way, the gap can be designed to allow a certain amount of displacement of the first manifold 201 between the first and second plates 2061, 2062, that is, to allow the first manifold 201 to expand. However, the size of the gap needs to be limited to limit the expansion of the first manifold 201 to within a preset value.

[0041] like Figure 1 As shown, multiple tube banks 203 are connected to the first header 201 via the second header 202. Tube banks 203 are relatively short and straight. Excessive expansion displacement of the first header 201 may be transmitted to the tube banks 203 via the connecting pipes 204 and the second header 202, thereby affecting the relative movement between the tube banks 203 and the furnace wall 100 and causing excessive slippage of the tube banks 203. A stopper 206 is provided to limit the expansion of the first header 201, thereby ensuring that the distance between the first header 201 and the furnace wall 100 remains within a certain range, thereby preventing excessive slippage of the tube banks 203 and the furnace wall 100.

[0042] Furthermore, the limiting device 206 in this embodiment further includes a third plate portion 2063 and a fourth plate portion 2064 arranged opposite to each other, the third plate portion 2063 connecting one end of the first plate portion 2061 and the second plate portion 2062, and the fourth plate portion 2064 connecting the other end of the first plate portion 2061 and the second plate portion 2062. Figure 1 As shown, the first plate portion 2061, the second plate portion 2062, the third plate portion 2063, and the fourth plate portion 2064 enclose an annular frame, through which the first header 201 passes. The third plate portion 2063 and the fourth plate portion 2064 can connect the first plate portion 2061 and the second plate portion 2062 together, making the structure more stable and reliable.

[0043] In addition, the limiting device 206 further includes a connecting plate 2065, which connects the annular frame and the rooting member 205. Figure 1 As shown, the limiting device 206 includes two connecting plates 2065, one end of one connecting plate 2065 is connected to the top of the rooting piece 205, and one end of the other connecting plate 2065 is connected to the bottom of the rooting piece 205, and the other ends of the two connecting plates 2065 are connected to the side of the second plate portion 2062, so that when the limiting device 206 is suspended and connected to the rooting piece 205, the connection is relatively reliable.

[0044] In this embodiment, each tube bank 203 includes a plurality of tubes 2031 , which are arranged along the length direction of the corresponding second header 202 . Figure 1 The second header 202 extends in the vertical direction, and the length direction of the second header 202 is the vertical direction. Figure 2 It is understood that, in each tube row 203 , the connection position between one tube 2031 and the second header 202 is staggered with the connection position between the other tube 2031 and the second header 202 in a direction perpendicular to the length of the second header 202 .

[0045] For reference Figure 1 、 2 , and combined with Figure 3 understand, Figure 3 for Figure 2 Enlarged view of area A in the middle.

[0046] A connecting hole needs to be opened at the connection position between the second header 202 and each pipeline 2031 to connect with the corresponding pipeline 2031. The multiple pipelines 2031 of a group of pipe rows 203 are arranged in parallel in one direction. If they are directly connected to the second header 202 along the extension direction of the pipeline 2031, it is necessary to simultaneously open multiple connecting holes 202a along a line on the wall of the second header 202 along the length direction of the second header 202 (as shown in FIG. Figure 4 ), which may have an adverse effect on the strength and reliability of the second header 202. Figure 2 If the second header 202 is staggered, it is not necessary to simultaneously open multiple communication holes 202a along a line in the length direction of the second header 202. The multiple communication holes 202a can be staggered. Figure 3 As shown, the second manifold 202 is a circular tube structure, the pipeline 2031 is connected to the second manifold 202 through a pipe joint 2031a, and two adjacent pipe joints 2031a are staggered along the circumference of the second manifold 202. The second manifold 202 can have two groups of connecting holes, and each group of connecting holes 202a is distributed along a line in the length direction of the second manifold 202.

[0047] You can continue to refer to Figure 4 understand, Figure 4 Schematic diagram of a connecting hole 202a provided on the second header 202 of the header system 200 of the coal-fired boiler of the present application. Figure 4 Seven connecting holes 202a are shown, corresponding to a scenario in which a tube row 203 includes seven tubes 2031. Four tubes 2031 that are spaced apart from each other among the seven tubes 2031 can be connected to the four connecting holes 202a on the left, and the other three tubes 2031 that are spaced apart can be connected to the three connecting holes 202a on the right.

[0048] In order to stagger the pipe joints 2031a, the pipe 2031 includes a bent section near the pipe joint 2031a, so that the pipe joint 2031a has a certain angle β relative to the extension direction of the main part of the pipe 2031, as shown in FIG. Figure 3 shown.

[0049] Please continue to refer to Figure 5-7 , Figure 5 This is a structural diagram of a second embodiment of a header system 200 for a coal-fired boiler of the present application; Figure 6 for Figure 5 Middle BB section view; Figure 7 for Figure 5 Top view of .

[0050] The manifold system 200 in this embodiment is basically the same as the first embodiment, and also includes a first manifold 201, a second manifold 202, and multiple groups of pipe rows 203. The same structure will not be described again. The difference is that the pipe rows 203 in the second embodiment are not directly connected to the second manifold 202 in the horizontal direction as in the first embodiment. The second manifold 202 of the manifold system 200 of the second embodiment extends horizontally, and the pipelines 2031 of each group of pipe rows 203 are not straight pipes. Each group of pipe rows 203 includes a first pipe row section 203a, a second pipe row section 203b, and a third pipe row section 203c connecting the first pipe row section 203a and the second pipe row section 203b. The extension direction of the first pipe row section 203a is perpendicular to the extension direction of the second pipe row section 203b, and the third pipe row section 203c is an arc-shaped pipe row section. Specifically, Figure 5 That is, the first tube bank segment 203a extends in the horizontal direction, and the second tube bank segment 203b extends in the vertical direction, wherein the first tube bank segment 203a is used to pass through the furnace wall 100, and the second tube bank segment 203b is used to connect to the first header 201.

[0051] With this configuration, the length of tube bank 203 can be longer than that of the first embodiment. The length of the first tube bank segment 203a can be greater than the entire length of the tube bank 203 in the first embodiment. The length of the first tube bank segment 203a is roughly equal to the distance between the first header 201 and the furnace wall 100. Furthermore, the tube bank 203 in the second embodiment includes a curved third tube bank segment 203c. This provides significant flexibility for the tube bank 203, absorbing structural stress caused by the temperature difference between the second header 202 and the furnace wall 100, as well as structural stress within the entire header system 200 between the first header 201 and the furnace wall 100. Consequently, the header system 200 in the second embodiment achieves similar effects to the first embodiment without requiring the stopper 206, preventing excessive slippage between the pipe joints 2031a of the tube bank 203 and the furnace wall 100. In addition, due to the flexible design of the tube bank 203 itself, the connecting pipe 204 between the first header 201 and the second header 202 does not need to be bent, and the connecting pipe 204 in the second embodiment can be a substantially straight pipe.

[0052] It should be noted that, in the above embodiment, multiple groups of tube rows 203 are arranged in the horizontal direction. It can be seen that multiple groups of tube rows 203 can also be arranged in the vertical direction. In this case, each group of tube rows 203 includes multiple pipes 2031, and the multiple pipes 2031 of each group of tube rows 203 are arranged in the horizontal direction. Accordingly, the second collection box 202 can be extended horizontally, and the first collection box 201 can be extended vertically; of course, the first collection box 201 and the second collection box 202 can also be extended horizontally. The principle is similar. The setting form of the tube row 203 can be set according to the first embodiment or the second embodiment, and will not be repeated.

[0053] The embodiment of the present application further provides a coal-fired boiler, comprising a furnace wall 100 and a header system 200 of the coal-fired boiler described in any of the above embodiments, which has the same technical effects and will not be described in detail.

[0054] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. The header system of coal-fired boiler is characterized by: The invention comprises a second header (202), at least one first header (201), and a plurality of tube banks (203), wherein one end of each tube bank (203) passes through the furnace wall (100) of the coal-fired boiler, and the other end of each tube bank (203) is connected to one second header (202); the first header (201) and the plurality of second headers (202) are connected.

2. The header system of the coal-fired boiler according to claim 1, characterized in that: The plurality of tube rows (203) are arranged in a horizontal direction or in a vertical direction, and the first header (201) and the second header (202) are perpendicular to each other.

3. The header system of the coal-fired boiler according to claim 2, characterized in that: It also includes a connecting pipe (204), and each of the second headers (202) is connected to the first header (201) via the corresponding connecting pipe (204), and the connecting pipe (204) includes a bent pipe section (2042).

4. The header system of a coal-fired boiler according to claim 2 or 3, characterized in that: It also includes a limiting device (206) and a rooting piece (205) connected to the furnace wall (100), wherein the limiting device (206) is connected to the rooting piece (205); The limiting device (206) comprises a first plate portion (2061) and a second plate portion (2062) which are arranged relative to each other, and the second plate portion (2062) is closer to the rooting member (205) relative to the first plate portion (2061); the first collecting box (201) is located between the first plate portion (2061) and the second plate portion (2062), and in the arrangement direction of the first plate portion (2061) and the second plate portion (2062), there is a gap between the first collecting box (201) and the first plate portion (2061) and the second plate portion (2062).

5. The header system of the coal-fired boiler according to claim 4, characterized in that: The limiting device (206) further includes a third plate portion (2063) and a fourth plate portion (2064) arranged opposite to each other, wherein the third plate portion (2063) connects one end of the first plate portion (2061) and the second plate portion (2062), and the fourth plate portion (2064) connects the other end of the first plate portion (2061) and the second plate portion (2062); the first plate portion (2061), the second plate portion (2062), the third plate portion (2063), and the fourth plate portion (2064) form an annular frame, and the first collecting box (201) passes through the annular frame.

6. The header system of the coal-fired boiler according to claim 5, characterized in that: The limiting device (206) further comprises a connecting plate (2065), wherein the connecting plate (2065) connects the annular frame and the rooting member (205).

7. The header system of the coal-fired boiler according to claim 2, characterized in that: Each group of tube rows (203) comprises a first tube row segment (203a), a second tube row segment (203b), and a third tube row segment (203c) connecting the first tube row segment (203a) and the second tube row segment (203b); the extension direction of the first tube row segment (203a) is perpendicular to the extension direction of the second tube row segment (203b), and the third tube row segment (203c) is an arc-shaped tube row segment; The first tube bank section (203a) is used to pass through the furnace wall (100), and the second tube bank section (203b) is connected to the first header (201).

8. The header system of the coal-fired boiler according to claim 7, characterized in that: It also includes a connecting pipe (204), and each of the second headers (202) is connected to the first header (201) via the corresponding connecting pipe (204), and the connecting pipe (204) is a straight pipe.

9. The header system of a coal-fired boiler according to any one of claims 1-3 and 5, characterized in that: Each group of the tube rows (203) comprises a plurality of tubes (2031), and the plurality of tubes (2031) are arranged along the length direction of the corresponding second header (202); in each group of two adjacent tubes (2031), the connection position between one tube (2031) and the second header (202) is staggered with the connection position between the other tube (2031) and the second header (202) in a direction perpendicular to the length direction of the second header (202).

10. A coal-fired boiler, characterized in that: A header system (200) for a coal-fired boiler comprising a furnace wall (100) and the header system (200) according to any one of claims 1 to 9.

Images