A connection container, a water-cooled wall device and a boiler

Abstract

The present invention provides a connecting container, a water-cooled wall device and a boiler. The connecting container includes a container body. The connecting container is installed outside the connecting port where the bypass pipe and the boiler are connected. The axial direction of the container body is arranged horizontally along the outer wall of the boiler and the axial direction of the container body is perpendicular to the flue gas flow direction. The cross-sectional depth value of the container body is greater than the height value. Under the condition of ensuring that its overall capacity and axial length remain unchanged, the connecting container of this structure increases the depth value of the connecting container parallel to the flue gas flow direction and reduces the height value of the connecting container perpendicular to the connecting container direction, that is, the cross section of the container body is made into an oblong shape, so that the first cross-sectional area is the same as the cross section of the cylindrical connecting container in the prior art. Compared with the cylindrical coupling box in the prior art, the height value of the connecting container is reduced, the total projected surface area of ​​the connecting container on the connecting port is reduced, the effective area through which the flue gas can pass is increased, and the resistance of the flue gas when passing through the bypass pipe is effectively reduced.

Description

Technical Field

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

[0002] The renovated or newly built denitrification reactor in the power plant generally adds a bypass flue on 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 for heat dissipation to ensure that the temperature of the flue gas entering the denitrification reactor is not too high, thereby ensuring the efficiency of denitrification. A rectangular connecting port connected to the bypass pipe is opened on the boiler side wall. The high-temperature flue gas enters the bypass pipe through the connecting port and then is discharged from the boiler through the bypass pipe. A large number of vertically arranged water-cooled wall pipes are arranged outside the connecting port. Multiple water-cooled wall pipes are arranged in parallel and spaced apart. Multiple water-cooled wall pipes with a certain height spacing are connected to the header box above and below to connect the multiple water-cooled wall pipes together.

[0003] When the opening area of ​​the connecting port is small, or the opening position is just located in the area between the upper and lower headers, the high-temperature flue gas in the furnace enters the bypass flue through the gap between the water-cooled wall pipes. When the opening area of ​​the connecting port is large, one of the upper and lower headers will block the connecting port; or when the opening position is just located on the inside of one of the headers or both headers, the header will also block the connecting port. In order to ensure the capacity of the header, the header is generally cylindrical, with a circular cross-section. The axial direction of the header is horizontally arranged along the outer wall of the boiler, and the axial direction of the header is perpendicular to the direction of flue gas flow. The upper and lower heights of the header are its outer diameter. The length of the axial projection of the header on the connecting port multiplied by the height of the header is the total blocking area of ​​the header. When the axial projection length of the header is the same, the header has a larger outer diameter and a higher height, and its projection area on the connecting port is large, and the effective cross-section through which the flue gas can pass is small, resulting in increased resistance when the flue gas passes through the bypass pipe. 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 cross-sectional shape of the header outside the connecting port where the bypass pipe is connected to the boiler is circular, resulting in a high header height and a large blocking area outside the connecting port, which increases the resistance of the flue gas when passing through the bypass pipe.

[0005] To this end, the present invention provides a connection container, comprising

[0006] A container body, which is suitable for being arranged outside the communication port where the bypass pipe communicates with the boiler, wherein the axial direction of the container body is suitable for being arranged horizontally along the outer wall of the boiler and the axial direction of the container body is perpendicular to the flue gas flow direction;

[0007] The cross section of the container body is a first cross section, the maximum length of the first cross section parallel to the smoke flow direction is its depth value, the maximum length of the first cross section perpendicular to the smoke flow direction is its height value, and the depth value is greater than the height value;

[0008] After installation, the capacity and axial length of the container body are the same as the capacity of the cylindrical barrel-shaped connection containers adjacent to it above and below.

[0009] Optionally, in the above-mentioned connecting container, the surface of the container body facing the connecting port is a curved surface.

[0010] Optionally, in the above-mentioned connection container, the first cross-section is an ellipse, the length of the major axis of the ellipse is the depth value of the first cross-section, and the length of the minor axis of the ellipse is the height value of the first cross-section.

[0011] The present invention provides a water-cooled wall device, comprising any one of the above-mentioned connecting containers and a plurality of water-cooled wall pipes connected to the connecting container.

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

[0013] The cross-sectional area of ​​the pipe body is the same as the cross-sectional area of ​​the circular water-cooled wall pipes adjacent thereto.

[0014] Optionally, in the above-mentioned water-cooled wall device, the surface of the pipe body facing the connecting port is a curved surface.

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

[0016] Optionally, in the water-cooled wall device, a plurality of water-cooled wall pipes are arranged in parallel and at intervals along the axial direction of the connecting container;

[0017] One of any at least two adjacent water-cooled wall pipes is a changing pipe, and the other water-cooled wall pipe is a vertical pipe;

[0018] An elbow joint is provided at the end of the changing-direction pipe connected to the connecting container, and the elbow joint and the first end of the vertical pipe connected to the connecting container are arranged along a first straight line; the end of the elbow joint away from the second end of the connecting container extends to the front or rear side of the vertical pipe, and the changing-direction pipe is connected to the second end of the elbow joint and extends vertically so that the changing-direction pipe is located at the front or rear side of the vertical pipe.

[0019] Optionally, in the above-mentioned water-cooled wall device, the side with a narrower width of the water-drop shape is the first side, the side with a wider width is the second side, and the first side of the water-cooled wall pipes close to the connecting port in the water-cooled wall pipes arranged front to back faces the connecting port; and / or

[0020] The first side of the water-cooled wall pipe far away from the connecting port among the water-cooled wall pipes arranged in front and behind faces outward.

[0021] The present invention provides a boiler, comprising any one of the water-cooled wall devices described above.

[0022] The technical solution of the present invention has the following advantages:

[0023] 1. The connecting container provided by the present invention increases the depth value of the connecting container parallel to the direction of smoke flow and reduces the height value of the connecting container perpendicular to the direction of the connecting container while ensuring that its overall capacity and axial length remain unchanged. That is, the cross-section of the container body is made into an oblong shape, so that the first cross-sectional area is the same as the cross-section of the cylindrical connecting container in the prior art. Compared with the cylindrical connecting box in the prior art, the height value of the connecting container is reduced, the total projected surface area of ​​the connecting container on the connecting port is reduced, the effective area through which the smoke can pass is increased, and the resistance of the smoke passing through the bypass pipe is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] Figure 1 A schematic diagram of a water-cooled wall device provided in Example 2 of the present invention;

[0026] Figure 2 A schematic cross-sectional view of a connection container provided in Example 1 of the present invention;

[0027] Figure 3 for Figure 2 A cross-sectional view of the water-cooled wall pipe along the flue gas flow direction;

[0028] Figure 4 for Figure 2 A cross-sectional view of the water-cooled wall pipe along the flue gas flow direction;

[0029] Figure 5 for Figure 2 A cross-sectional view of the water-cooled wall pipe along the flue gas flow direction;

[0030] Figure 6 for Figure 2 Cross-sectional view of the middle water-cooled wall pipe along the flue gas flow direction.

[0031] Description of reference numerals:

[0032] 1-container body; 21-direction-changing pipe; 22-vertical pipe; 23-elbow joint; 24-first side; 25-second side. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] Example 1

[0038] This embodiment provides a connection container, such as Figure 1 and Figure 2 As shown, it includes a container body 1. When in use, the connecting container is installed outside the connecting port where the bypass pipe is connected to the boiler. The axial direction of the container body 1 is horizontally arranged along the outer wall of the boiler and the axial direction of the container body 1 is perpendicular to the flue gas flow direction.

[0039] The cross section of the container body 1 is the first cross section, and the maximum length of the first cross section parallel to the smoke flow direction is its depth value, that is, Figure 2 The maximum length of the first section in the left and right direction is the depth value, and the maximum length of the first section perpendicular to the direction of smoke flow is the height value, that is, Figure 2 The maximum length of the first section in the vertical direction is the height value, and the depth value is greater than the height value; after the connecting container is installed, the capacity and axial length of the container body 1 are the same as the capacity of the cylindrical connecting containers adjacent to it above and below.

[0040] The connecting container of this structure increases the depth value of the connecting container parallel to the direction of smoke flow and decreases the height value of the connecting container perpendicular to the direction of the connecting container while ensuring that its overall capacity and axial length remain unchanged. That is, the cross-section of the container body 1 is made into an oblong shape, so that the first cross-sectional area is the same as the cross-sectional area of ​​the cylindrical connecting container in the prior art. Compared with the cylindrical connecting box in the prior art, the height value of the connecting container is reduced, the total projected surface area of ​​the connecting container on the connecting port is reduced, the effective area through which the smoke can pass is increased, and the resistance of the smoke passing through the bypass pipe is effectively reduced.

[0041] See also Figure 2 , the surface of the container body 1 facing the connecting port (i.e., the windward surface) is an arc surface, which plays a role in guiding the smoke, has a good flow field, and has a small resistance to smoke passing. The windward surface of the container body 1 is less worn than the outer wall surface with edges and corners. For example, the first cross section is an ellipse, the length of the major axis of the ellipse is the depth value of the first cross section, and the length of the minor axis of the ellipse is the height value of the first cross section. The shape of the first cross section can be shuttle-shaped, rectangular, etc., as long as the minor axis of the first cross section is arranged vertically to reduce its height value perpendicular to the direction of smoke flow.

[0042] Example 2

[0043] This embodiment provides a water-cooled wall device, such as Figure 1 As shown, it includes the connecting container in Example 1 and a plurality of water-cooled wall pipes connected to the connecting container.

[0044] The water-cooled wall pipe includes the pipe body, see Figures 3 to 6 The cross-sectional shape of the pipe body is a first shape, the maximum length of the first shape parallel to the flue gas flow direction is a first length, the maximum length perpendicular to the flue gas flow direction is a second length, and the first length is greater than the second length; the cross-sectional area of ​​the pipe body is the same as the cross-sectional area of ​​the circular water-cooled wall pipes adjacent to it above and below.

[0045] For example, the connecting container is a header. Normal water-cooled wall pipes are arranged vertically along the outer wall of the boiler, and multiple water-cooled wall pipes at a certain height interval are connected through a header. When the water-cooled wall pipes of this structure are used, they are installed between two headers outside the connecting port where the boiler side wall is connected to the bypass pipe. In order to ensure that the flow rate of the water-cooled wall pipe remains unchanged compared to the circular water-cooled wall pipe, the cross-sectional area of ​​the pipe body is made the same as the cross-sectional area of ​​the circular water-cooled wall pipes adjacent above and below the header, the length of the pipe body parallel to the direction of flue gas flow is lengthened, and the length of the pipe body perpendicular to the direction of flue gas flow is shortened, that is, the cross-section of the pipe body is made into an oblong shape, and the width of the first shape perpendicular to the direction of flue gas flow is narrower than the circular cross-section, which increases the gap between the pipes and the effective area through which the flue gas can pass, reduces the resistance of the flue gas passing, and helps to reduce the resistance and energy consumption of the boiler system.

[0046] Preferably, the surface of the pipe body facing the connecting port is a curved surface, and the windward surface of the pipe body is a curved surface, which is conducive to guiding the flue gas, has a good flow field, and has low resistance to the passage of flue gas. The windward surface of the pipe is less worn than the angular outer wall surface.

[0047] See also Figure 1 , multiple water-cooled wall pipes are arranged in parallel and spaced apart along the axial direction of the connecting container; one of any two adjacent water-cooled wall pipes is a changing pipe 21, and the other water-cooled wall pipe is a vertical pipe 22; an elbow joint 23 is provided at the end of the changing pipe 21 connected to the connecting container, and the first end of the elbow joint 23, the vertical pipe 22 and the header are arranged along a first straight line on the header; the end of the elbow joint 23 away from the second end of the connecting container extends to the front side or rear side of the vertical pipe 22, and the changing pipe 21 is connected to the second end of the elbow joint 23 and extends vertically, so that the changing pipe 21 is located at the front side or rear side of the vertical pipe 22.

[0048] In the water-cooled wall device of this structure, the redirecting pipe 21 is arranged on the front side or the rear side of the vertical pipe 22 through the elbow joint 23. Along the direction of the flue gas flow, the vertical pipe 22 and the redirecting pipe 21 overlap front to back, and the projection surfaces of the two on the boiler connecting port are the same. The gap between the pipes perpendicular to the direction of the 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.

[0049] For example, see Figure 1 , six water-cooled wall pipes are shown in the figure. Before the improvement, the upper and lower ends of the six water-cooled wall pipes are connected to the upper and lower headers respectively and extend vertically, and the water-cooled wall pipes are arranged in parallel and spaced apart. The present invention uses an elbow joint 23 to extend a water-cooled wall pipe on the right side of the two adjacent water-cooled wall pipes to the rear side of the water-cooled wall pipe on the left side. The water-cooled wall pipe on the rear side serves as a change-of-direction pipe 21, which overlaps with the vertical pipe 22 that has not changed direction. The effective cross-section through which the smoke can pass is increased by nearly one-fold, greatly reducing the resistance of the smoke passing through.

[0050] Alternatively, see Figure 3 The first shape is 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 24, and the wider side is the second side 25. The first side 24 of the water wall pipes near the connecting port in the front and rear arranged water wall pipes faces the connecting port. That is, Figure 3 In the figure, the upper side of the pipe cross section is the first side 24, and the lower side is the second side 25. The first side 24 is the windward side and has a narrow width, which is beneficial to reducing the resistance when smoke enters.

[0051] Alternatively, see Figure 3 , the first side 24 of the water-cooled wall pipes arranged forward and backward along the flue gas flow, away from the connecting port, faces the connecting port. Or, preferably, see Figure 4 The first side 24 of the water-cooled wall pipes arranged in the front and rear directions and away from the connecting port faces outwards, that is, the two water-cooled wall pipes arranged in the front and rear directions are arranged in a mirror image. When the flue gas enters and exits the pipe, the resistance is small and the flow field is good, which is conducive to the discharge of the flue gas.

[0052] See also Figure 5 The first shape can be an ellipse, the major axis of the ellipse is parallel to the direction of the flue gas flow, the minor axis is perpendicular to the direction of the flue gas flow, the minor axis is narrow, and the gap between the pipes is large.

[0053] Alternatively, see Figure 6 The first shape is a shuttle shape, with the line connecting the two end points parallel to the flue gas flow direction as its long axis and the line connecting the two end points perpendicular to the flue gas flow direction as its short axis. The first shape can also be any other shape, as long as the width of the pipe along the first direction is narrower than that of 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.

[0054] Example 3

[0055] This embodiment provides a boiler, which includes the water-cooled wall device in Embodiment 2. In this structure of the boiler, the projected area of ​​the header and the water-cooled wall pipe on the connecting port is small, the resistance of the flue gas passing through the bypass pipe is small, and the boiler system is low-resistance and energy-saving.

[0056] 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: It comprises a connecting container and a plurality of water-cooled wall pipes connected to the connecting container; the connecting container comprises: A container body (1) adapted to be arranged outside a communication port where the bypass pipe communicates with the boiler, wherein the axial direction of the container body (1) is adapted to be arranged horizontally along an outer wall of the boiler and the axial direction of the container body (1) is perpendicular to a flue gas flow direction; The cross section of the container body (1) is a first cross section, the maximum length of the first cross section parallel to the smoke flow direction is its depth value, the maximum length of the first cross section perpendicular to the smoke flow direction is its height value, and the depth value is greater than the height value; After installation, the capacity and axial length of the container body (1) are the same as the capacity of the cylindrical tube-shaped connected containers adjacent to it above and below; The surface of the container body (1) facing the communication port is a curved surface; The first cross section is an ellipse, the length of the major axis of the ellipse is the depth value of the first cross section, and the length of the minor axis of the ellipse is the height value of the first cross section; The water-cooled wall pipe comprises a pipe body, the cross-sectional shape of the pipe body is a first shape, the maximum length of the first shape parallel to the flue gas flow direction is a first length, the maximum length perpendicular to the flue gas flow direction is a second length, and the first length is greater than the second length; The cross-sectional area of ​​the pipe body is the same as the cross-sectional area of ​​the circular water-cooled wall pipes adjacent to it above and below; The surface of the pipe body facing the communication port is a curved surface; A plurality of water-cooled wall pipes are arranged in parallel and at intervals along the axial direction of the connecting container; One of any at least two adjacent water-cooled wall pipes is a direction-changing pipe (21), and the other water-cooled wall pipe is a vertical pipe (22); An elbow joint (23) is provided at the end of the direction-changing pipe (21) connected to the connection container; the elbow joint (23) and the first end of the vertical pipe (22) connected to the connection container are arranged along a first straight line; the end of the elbow joint (23) away from the second end of the connection container extends to the front side or the rear side of the vertical pipe (22); the direction-changing pipe (21) is connected to the second end of the elbow joint (23) and extends vertically, so that the direction-changing pipe (21) is located at the front side or the rear side of the vertical pipe (22).

2. A boiler, characterized in that: It comprises the water-cooled wall device as claimed in claim 1.

Images