Water-cooled wall device and boiler

Abstract

The present invention provides a water-cooled wall device and a boiler, wherein the water-cooled wall device comprises a plurality of first pipes and a first connecting container arranged in parallel and at intervals. The first pipe is suitable for being arranged outside the opening where the bypass pipe communicates with the boiler; the first connecting container is arranged on the upper end face or the lower end face of the first pipe and is connected to the first pipe; the end of the second end of the first elbow joint extends to the front or rear side of the vertical pipe, and the change-of-direction pipe is connected to the second end of the first elbow joint and extends vertically. In the water-cooled wall pipe of this structure, the change-of-direction pipe is arranged on the front or rear side of the vertical pipe through the first elbow joint, and along the direction of flue gas flow, the vertical pipe and the change-of-direction pipe overlap front and back, and the projection surface of the two on the boiler opening is the same, and the gap between the pipes perpendicular to the direction of flue gas flow increases, which effectively increases the effective area through which the flue gas can pass, and the resistance of the flue gas is reduced when it passes through the first pipe, which is conducive to reducing the resistance and energy consumption of the boiler system.

Description

Technical Field

[0001] The invention relates to the technical field of boiler heat dissipation, and in particular to a water-cooled wall device and a boiler. Background Art

[0002] At present, power plants are carrying out a new round of ultra-low emission renovation projects, involving the renovation and replacement of a large number of flue gas denitrification devices. For renovated or newly built denitrification reactors, a bypass flue will be added to the boiler side wall at the front end of the denitrification reactor. Part of the high-temperature flue gas in the boiler is led out of the boiler through the bypass pipe to ensure that the flue gas temperature entering the denitrification reactor is within the design range, thereby ensuring the efficiency of denitrification. The boiler side wall is provided with an opening connected to the bypass pipe, and the high-temperature flue gas enters the bypass pipe through the opening and is discharged from the boiler. A large number of vertically arranged water-cooled wall pipes are arranged outside the opening. Multiple water-cooled wall pipes are arranged in parallel and spaced apart. The high-temperature flue gas in the furnace can only enter the bypass flue through the gaps between the water-cooled wall pipes.

[0003] The existing water-cooled wall pipes are made of round steel pipes, which are connected by a header. The interface positions of multiple water-cooled wall pipes on the header are fixed and arranged in a straight line perpendicular to the flue gas flow direction. The gap between the water-cooled wall pipes at the interface between the bypass flue and the furnace wall is very small, and the projected area of ​​the water-cooled wall pipes on the opening almost occupies half of the entire opening area. The effective cross-section through which the flue gas can pass is very small, which greatly increases the resistance of the flue gas passing, the resistance of the system and the energy consumption. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art that the effective cross-sectional area through which the flue gas can pass is small at the opening where the bypass pipe is connected to the boiler, resulting in increased resistance to the passage of the flue gas and increased system resistance and energy consumption.

[0005] To this end, the present invention provides a water-cooled wall device, comprising

[0006] A plurality of first pipes arranged in parallel and at intervals, wherein the first pipes are suitable for being arranged outside the opening where the bypass pipe communicates with the boiler;

[0007] A first connecting container, which is arranged on the upper end surface or the lower end surface of the first pipeline and is connected to the first pipeline;

[0008] One of any at least two adjacent first pipes is a change-of-direction pipe, and the other first pipe is a vertical pipe;

[0009] The first end of the changing pipe connected to the first connecting container is provided with a first elbow joint, and the first elbow joint and the first end of the vertical pipe connected to the first connecting container are arranged along a first straight line; the end of the second end of the first elbow joint extends to the front or rear side of the vertical pipe, and the changing pipe is connected to the second end of the first elbow joint and extends vertically.

[0010] Optionally, the above-mentioned water-cooled wall device also includes a second connecting container, the first connecting container and the second connecting container are respectively arranged on the upper end surface and the lower end surface of the first pipe; the second end of the change-of-direction pipe connected to the second connecting container is provided with a second elbow joint.

[0011] Optionally, in the above-mentioned water-cooled wall device, among any at least three adjacent first pipes, the middle first pipe is a vertical pipe, and the first pipes on both sides are changing pipes; the changing pipes on both sides are respectively arranged on the front and rear sides of the vertical pipe through elbow joints.

[0012] Optionally, in the above-mentioned water-cooled wall device, the cross-sectional shape of the first pipe is a first shape, the length of the first shape parallel to the flue gas flow direction is a first length, the length perpendicular to the flue gas flow direction is a second length, and the first length is greater than the second length.

[0013] Optionally, in the above-mentioned water-cooled wall device, the first shape is elliptical.

[0014] Optionally, in the above-mentioned water-cooled wall device, the first shape is a shuttle shape.

[0015] Optionally, in the above-mentioned water-cooled wall device, the first shape is a water drop shape.

[0016] Optionally, in the above-mentioned water-cooled wall device, the side with a narrower width of the teardrop shape is the first side, the side with a wider width is the second side, and the first side of the first pipe close to the opening among the first pipes arranged front to back faces the opening.

[0017] The present invention provides a boiler, comprising any one of the water-cooled wall devices described above.

[0018] The technical solution of the present invention has the following advantages:

[0019] 1. The water-cooled wall device provided by the present invention is installed outside the opening connecting the bypass pipe and the boiler when in use. The change-of-direction pipe is arranged on the front side or the rear side of the vertical pipe through the first elbow joint. Along the direction of flue gas flow, the vertical pipe and the change-of-direction pipe overlap front and back, and the projection surfaces of the two on the boiler opening are the same. The gap between the pipes perpendicular to the direction of flue gas flow is increased, which effectively increases the effective area through which the flue gas can pass. The resistance of the flue gas is reduced when it passes through the first pipe, which is beneficial to reducing the resistance and energy consumption of the boiler system.

[0020] 2. The boiler provided by the present invention includes a water-cooled wall device, and the resistance of the flue gas is small when passing through the bypass pipe, and the boiler system has low resistance and energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of a water-cooled wall device provided in Example 1 of the present invention;

[0023] Figure 2 for Figure 1 A cross-sectional view of the first pipe along the direction of flue gas flow;

[0024] Figure 3 for Figure 1 A cross-sectional view of the first pipe along the direction of flue gas flow;

[0025] Figure 4 for Figure 1 A cross-sectional view of the first pipe along the direction of flue gas flow;

[0026] Figure 5 A schematic diagram of a water-cooled wall device provided in Example 2 of the present invention;

[0027] Figure 6 for Figure 5 A cross-sectional view of the first pipe along the direction of flue gas flow.

[0028] Description of reference numerals:

[0029] 11-direction-changing pipe; 12-vertical pipe; 13-first elbow joint; 14-second elbow joint; 15-first side; 16-second side; 21-first connection container; 22-second connection container. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] Example 1

[0035] This embodiment provides a water-cooled wall device, such as Figure 1 As shown, it includes a plurality of first pipes and a first connecting container 21 arranged in parallel and at intervals.

[0036] The first pipe is suitable for being arranged outside the opening where the bypass pipe communicates with the boiler; the first connecting container 21 is arranged on the upper end face or the lower end face of the first pipe and communicates with the first pipe; one of any at least two adjacent first pipes is a redirecting pipe 11, and the other first pipe is a vertical pipe 12;

[0037] The first end of the change-direction pipe 11 connected to the first connection container 21 is provided with a first elbow joint 13, and the first elbow joint 13 and the first end of the vertical pipe 12 connected to the first connection container are arranged along a first straight line; the direction of the flue gas flow is the front-to-back direction, wherein the side close to the opening is the front side, and the side away from the opening is the rear side. The end of the second end of the first elbow joint 13 extends to the front side or the rear side of the vertical pipe 12, and the change-direction pipe 11 is connected to the second end of the first elbow joint 13 and extends vertically.

[0038] When the water-cooled wall pipe of this structure is used, it is installed outside the opening connecting the bypass pipe and the boiler. The change-of-direction pipe 11 is arranged on the front side or the rear side of the vertical pipe 12 through the first elbow joint 13. Along the direction of flue gas flow, the vertical pipe 12 and the change-of-direction pipe 11 overlap front to back, and the projection surfaces of the two on the boiler opening are the same. The gap between the pipes perpendicular to the direction of flue gas flow is increased, which effectively increases the effective area through which the flue gas can pass. The resistance of the flue gas is reduced when it passes through the first pipe, which is beneficial to reduce the resistance and energy consumption of the boiler system.

[0039] like Figure 1 As shown, the water-cooled wall device further includes a second connecting container 22. The first connecting container 21 and the second connecting container 22 are respectively arranged on the upper end surface and the lower end surface of the first pipe; the second end of the change-direction pipe 11 connected to the second connecting container 22 is provided with a second elbow joint 14. The first connecting container 21 and the second connecting container 22 are both headers.

[0040] For example, see Figure 1 , six first pipes are shown in the figure. Before the improvement, the upper and lower ends of the six first pipes are connected to the upper and lower headers respectively and extend vertically, and the first pipes are arranged in parallel and spaced apart. The present invention allows a first pipe on the right side of the two adjacent first pipes to extend to the rear side of the first pipe on the left side through the first elbow joint 13 and the second elbow joint 14. The first pipe on the rear side serves as a change-of-direction pipe 11, which overlaps with the vertical pipe 12 that has not changed direction. The effective cross-section through which smoke can pass is increased by nearly one-fold, greatly reducing the resistance of smoke passing.

[0041] The direction perpendicular to the direction of the flue gas flow is the first direction. In the prior art, the cross section of the water-cooled wall pipe is circular, and the projection width of the circular cross section on the opening is the size of its diameter. The width is wide, resulting in a narrow gap through which the flue gas can pass. The cross-sectional shape of the first pipe of the present invention is the first shape, and the length of the first shape parallel to the direction of the flue gas flow is the first length, and the length perpendicular to the direction of the flue gas flow is the second length. The first length is greater than the second length, that is, the first shape is oblate, and the cross section of the first pipe is elongated to ensure that its cross-sectional area and flow rate remain unchanged compared to the circular pipe; the width of the first shape along the first direction is narrower than the circular cross section, further increasing the gap between the pipes and reducing the resistance to the passage of the flue gas.

[0042] For example, see Figure 2 The first shape is an ellipse, the major axis of the ellipse is parallel to the flue gas flow direction, the minor axis is parallel to the first direction, the minor axis is narrow, and the gap between the pipes is large. At the same time, the windward side of the outer wall of the pipe is an arc shape, which can guide the flue gas, and the outer wall of the pipe has no edges and corners and little wear.

[0043] See also Figure 3 The first shape may also be a shuttle shape, with a line parallel to the two end points of the flue gas flow direction as its long axis and a line parallel to the two end points of the first direction as its short axis.

[0044] See also Figure 4 The first shape can also be a water drop shape, with the line connecting the two end faces parallel to the flue gas flow direction as its long axis, and the line connecting the two end points parallel to the first direction as its short axis. The narrower side of the water drop shape is the first side 15, and the wider side is the second side 16, that is, Figure 4 In the figure, the upper side of the pipe cross section is the first side 15, and the lower side is the second side 16. The first side 15 of the first pipe close to the opening in the first pipes arranged forward and backward along the smoke flow faces the opening, and the first side 15 is narrow, which reduces the resistance when the smoke enters.

[0045] Optionally, the first side 15 of the first pipe far from the opening in the first pipes arranged forward and backward along the smoke flow faces the opening. The first shape can also be any other shape, as long as the width of the pipe along the first direction is narrower than the circular pipe to increase the spacing between the pipes while ensuring that the cross-sectional area of ​​the pipe is the same as that of the circular pipe.

[0046] The first pipeline and the curved pipeline are both welded by steel plates, and the ends of the two are welded to the header.

[0047] Example 2

[0048] This embodiment provides a water-cooled wall device, such as Figure 5 As shown, the difference from Example 1 is that among any at least three adjacent first pipes, the middle first pipe is a vertical pipe 12, and the first pipes on both sides are changing pipes 11; the changing pipes 11 on both sides are respectively arranged on the front and rear sides of the vertical pipe 12 through elbow joints.

[0049] For example, see Figure 5 , through the arrangement of the upper and lower elbow joints, the first pipe on the right side of the three adjacent first pipes extends to the rear side of the middle first pipe, and the first pipe on the left side extends to the front side of the middle first pipe. The first pipes on the left and right sides serve as the change-of-direction pipes 11, and overlap with the vertical pipe 12 that has not changed direction. The effective cross-section through which the smoke can pass increases by nearly two times, greatly reducing the resistance of the smoke passing. At this time, the cross-sectional view of the first pipe along the smoke flow direction is as follows Figure 6 shown.

[0050] Example 3

[0051] This embodiment provides a boiler, which includes the water-cooled wall device in embodiment 1 or embodiment 2. In the boiler with this structure, the resistance of flue gas passing through the bypass pipe is small, and the boiler system is low-resistance and energy-saving.

[0052] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A water-cooled wall device, characterized in that: include A plurality of first pipes arranged in parallel and at intervals, wherein the first pipes are suitable for being arranged outside the opening where the bypass pipe communicates with the boiler; a first connecting container (21), which is arranged on the upper end surface or the lower end surface of the first pipeline and is connected to the first pipeline; One of any at least two adjacent first pipes is a direction-changing pipe (11), and the other first pipe is a vertical pipe (12); The first end of the direction-changing pipe (11) connected to the first connection container (21) is provided with a first elbow joint (13); the first elbow joint (13) and the first end of the vertical pipe (12) connected to the first connection container are arranged along a first straight line; the end of the second end of the first elbow joint (13) extends to the front side or the rear side of the vertical pipe (12); the direction-changing pipe (11) is connected to the second end of the first elbow joint (13) and extends vertically; It also includes a second connecting container (22), wherein the first connecting container (21) and the second connecting container (22) are respectively arranged on the upper end surface and the lower end surface of the first pipeline; a second elbow joint (14) is arranged at the second end of the change-of-direction pipeline (11) connected to the second connecting container (22); Among any at least three adjacent first pipes, the middle first pipe is a vertical pipe (12), and the first pipes on both sides are direction-changing pipes (11); the direction-changing pipes (11) on both sides are respectively arranged at the front side and the rear side of the vertical pipe (12) through elbow joints; The cross-sectional shape of the first pipe is a first shape, the length of the first shape parallel to the flue gas flow direction is a first length, the length of the first shape perpendicular to the flue gas flow direction is a second length, and the first length is greater than the second length.

2. The water-cooled wall device according to claim 1, characterized in that: The first shape is an ellipse.

3. The water-cooled wall device according to claim 1, characterized in that: The first shape is a shuttle shape.

4. The water-cooled wall device according to claim 1, characterized in that: The first shape is a teardrop shape.

5. The water-cooled wall device according to claim 4, characterized in that: The side of the teardrop shape with a narrower width is a first side (15), and the side with a wider width is a second side (16). The first side (15) of the first pipes close to the opening in the first pipes arranged in front and behind faces the opening.

6. A boiler, characterized in that: The water-cooled wall device comprises the water-cooled wall device according to any one of claims 1 to 5.

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