Through-wall pipe sealing device capable of absorbing and expanding

Abstract

The utility model relates to the technical field of coal-fired power generation, in particular to a through-wall pipe sealing device capable of absorbing expansion, and aims to solve the problems of poor expansion and structural stress of a through-wall sealing device, prevention of furnace wall leakage and improvement of safety and reliability in operation of a heating surface of a boiler. According to the scheme, the water cooling wall is used for being arranged in the furnace wall to conduct cold water circulation so as to cool the furnace wall, the multiple through-wall pipes penetrate through the position, in the middle of the water cooling wall, of the furnace wall, each through-wall pipe is sleeved with one sleeve, the part, located below the water cooling wall, of each through-wall pipe is fixedly connected with one sleeve, and the multiple sleeves penetrate through one sealing flange plate and are fixedly connected with the sealing flange plate. According to the scheme, expansion displacement and structural stress between the heating surface scattering pipe and the water cooling wall area are eliminated, the situation that the displacement difference and the structural stress cause tension fracture and leakage of the furnace wall is prevented, and the heat dissipation effect of the furnace wall is improved. And the reliability and the safety of the heating surface in wide-load operation are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal-fired power generation, in particular to a wall-penetrating pipe sealing device capable of absorbing expansion. Background Art

[0002] In recent years, with the continuous improvement of the peak-shaving operation capacity of coal-fired boilers in large power plants, the deep peak-shaving has reached 20%-25% load capacity, and the boiler load regulation operation range has become larger. In this wide load operation range, it becomes very important to eliminate or reduce the impact of thermal stress and structural stress caused by the flexible operation of the boiler wide load on the key components of the boiler.

[0003] For tower boilers, the high-temperature heating surface diffuser pipes cross the water-cooled wall area. Due to the large material differences and temperature differences between the two, the linear expansion coefficients of the two are different. The heating surface diffuser pipes are longer, resulting in large expansion displacement and greater structural stress. The existing technology uses direct welding, which is prone to cracks and leads to furnace wall leakage.

[0004] Therefore, how to provide a wall-penetrating sealing device that can eliminate such expansion difference and structural stress, prevent furnace wall leakage, and improve the safety and reliability of boiler heating surface operation has become a technical problem that needs to be solved urgently. Utility Model Content

[0005] The purpose of this utility model patent: This utility model is to solve the expansion difference and structural stress of the wall-penetrating sealing device, prevent furnace wall leakage, and improve the safety and reliability of the boiler heating surface operation. The utility model provides a wall-penetrating pipe sealing device that can absorb expansion.

[0006] The purpose of the utility model is achieved as follows: a wall-penetrating pipe sealing device capable of absorbing expansion, comprising a sealing flange plate, an expansion joint, a water-cooled wall, a plurality of sleeves and a plurality of wall-penetrating pipes;

[0007] The water-cooled wall is used to be set up in the furnace wall to circulate cold water to cool the furnace wall. Multiple wall-penetrating pipes pass through the furnace wall in the middle of the water-cooled wall. Each sleeve is sleeved on a wall-penetrating pipe. The part of each wall-penetrating pipe located below the water-cooled wall is fixedly connected to a sleeve. Multiple sleeves pass through a sealing flange plate and are fixedly connected to the sealing flange plate. The top of the sealing flange plate is fixedly connected to the expansion joint. The expansion joint is arranged around the outside of the multiple sleeves, and the top of the expansion joint is fixedly connected to the water-cooled wall.

[0008] Furthermore, the sleeve is connected to the wall-penetrating pipe by welding.

[0009] Furthermore, a cylinder is arranged outside the expansion joint, the bottom of the cylinder is fixedly connected to the bottom of the expansion joint, and a gap is left between the top of the cylinder and the water-cooled wall.

[0010] Furthermore, the gap is 90mm-110mm.

[0011] Furthermore, a circle of rooting steel plates extending inwards is provided at the bottom of the cylinder, and the rooting steel plates are fixedly connected to the bottom of the expansion joint.

[0012] Furthermore, the rooting steel plate is welded to the bottom of the expansion joint.

[0013] Furthermore, a sealing filler block is fixed between every two adjacent tube walls on the water-cooled wall, and the top of the expansion joint is fixedly connected to the plurality of sealing fillers.

[0014] Furthermore, the top of the expansion joint is connected to a plurality of sealing blocks by welding.

[0015] Furthermore, the sealing block is L-shaped, the corners of the sealing block are arc-shaped, the long plate of the sealing block is fixedly connected to the expansion joint, each side of the short plate of the sealing block is set to an oblique angle, and the oblique angle is fixedly connected to the tube wall of the water-cooled wall.

[0016] Further, the expansion joint comprises a bellows, two end pipes and two end flanges;

[0017] Each end of the bellows is connected to an end flange through an end pipe, one end flange is fixedly connected to a sealing flange plate, and the other end flange is fixedly connected to a sealing packing block.

[0018] Beneficial effects:

[0019] This solution eliminates the expansion displacement and structural stress between the heating surface diffuser and the water-cooled wall area, prevents the furnace wall from cracking and leaking due to displacement difference and structural stress, and improves the reliability and safety of the heating surface during wide load operation.

[0020] This solution uses expansion joints to connect the high-temperature heated surface through-wall pipes and the water-cooled wall. The expansion joints are used to absorb the expansion displacement difference caused by the different temperature differences between the through-wall pipes and the water-cooled wall, solve the expansion displacement difference caused by different temperatures and the cracking problem caused by stress problems, and improve the reliability and safety of equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of a wall-penetrating pipe sealing device capable of absorbing expansion according to the utility model;

[0022] Figure 2 The utility model Figure 1 AA direction schematic diagram;

[0023] Figure 3 It is a schematic diagram of the expansion joint of the utility model;

[0024] Figure 4 The utility model Figure 3 An enlarged schematic diagram of location I;

[0025] Figure 5 It is a schematic diagram of a cylinder of the utility model;

[0026] Figure 6 This is a schematic diagram of the position of the sealing filler block welded water-cooled wall of the utility model;

[0027] Figure 7 It is a side view of the sealing filling block of the utility model;

[0028] Figure 8 It is a top view of the sealing filling block of the utility model;

[0029] Fig. 9 The utility model Figure 7 L direction schematic diagram. DETAILED DESCRIPTION

[0030] Specific implementation method 1: A wall-penetrating pipe sealing device capable of absorbing expansion, comprising a sealing flange plate 2, an expansion joint 3, a water-cooled wall 6, a plurality of sleeves 1 and a plurality of wall-penetrating pipes 7;

[0031] The water-cooled wall 6 is used to be set in the furnace wall for cold water circulation to cool the furnace wall. Multiple wall-penetrating pipes 7 pass through the furnace wall in the middle of the water-cooled wall 6. Each sleeve 1 is sleeved on a wall-penetrating pipe 7. The part of each wall-penetrating pipe 7 located below the water-cooled wall 6 is fixedly connected to a sleeve 1. Multiple sleeves 1 pass through a sealing flange plate 2 and are fixedly connected to the sealing flange plate 2. The top of the sealing flange plate 2 is fixedly connected to the expansion joint 3. The expansion joint 3 is arranged around the outside of the multiple sleeves 1, and the top of the expansion joint 3 is fixedly connected to the water-cooled wall 6.

[0032] Specific implementation method 2: A wall-penetrating pipe sealing device capable of absorbing expansion, wherein the sleeve 1 is connected to the wall-penetrating pipe 7 by welding.

[0033] In this embodiment: the sleeve and the wall-penetrating pipe are firmly connected after welding.

[0034] Other implementations are the same as the first specific implementation.

[0035] Specific implementation method three: A wall-penetrating pipe sealing device capable of absorbing expansion, wherein a cylinder 4 is arranged outside the expansion joint 3 , the bottom of the cylinder 4 is fixedly connected to the bottom of the expansion joint 3 , and a gap is left between the top of the cylinder 4 and the water-cooled wall 6 .

[0036] In this embodiment, a gap is left between the top of the cylinder and the water-cooled wall so that after the cylinder moves with the expansion joint, there is a movable space between the cylinder and the water-cooled wall.

[0037] Other implementations are the same as the first specific implementation.

[0038] Specific implementation method 4: A wall-penetrating pipe sealing device capable of absorbing expansion, wherein the gap is 90 mm-110 mm.

[0039] In this embodiment, the gap is 90 mm to 110 mm, and the gap is used as the moving space of the cylinder when the cylinder moves with the expansion joint.

[0040] Other implementations are the same as the first specific implementation.

[0041] Specific implementation method five: A wall-penetrating pipe sealing device capable of absorbing expansion, wherein a circle of rooting steel plates 8 extending inwards is provided at the bottom of the cylinder 4 , and the rooting steel plates 8 are fixedly connected to the bottom of the expansion joint 3 .

[0042] In this embodiment: a circle of rooting steel plates extending inwardly is provided at the bottom of the cylinder and connected to the bottom of the expansion joint, so that the inner wall of the cylinder and the expansion joint do not contact and interfere with each other.

[0043] Other implementations are the same as the first specific implementation.

[0044] Specific implementation method six: A wall-penetrating pipe sealing device capable of absorbing expansion, wherein the rooting steel plate 8 is welded to the bottom of the expansion joint 2.

[0045] In this embodiment: the rooting steel plate is firmly connected to the bottom of the expansion joint after welding.

[0046] Other implementations are the same as the first specific implementation.

[0047] Specific embodiment seven: A wall-penetrating pipe sealing device capable of absorbing expansion, wherein a sealing filler block 5 is fixed between every two adjacent pipe walls on the expansion water-cooled wall 6 , and the top of the expansion joint 3 is fixedly connected to the plurality of sealing fillers 5 .

[0048] In this embodiment, the sealing block material is the same as the water-cooled wall material.

[0049] Other implementations are the same as the first specific implementation.

[0050] Specific implementation method eight: A wall-penetrating pipe sealing device capable of absorbing expansion, wherein the top of the expansion joint 3 is welded to a plurality of sealing filling blocks 5 .

[0051] In this embodiment, the top of the expansion joint is firmly connected to the plurality of sealing blocks after being welded.

[0052] Other implementations are the same as the first specific implementation.

[0053] Specific embodiment nine: A wall-penetrating pipe sealing device that can absorb expansion, the sealing block 5 is L-shaped, the corners of the sealing block 5 are arc-shaped, the long plate of the sealing block 5 is fixedly connected to the expansion joint 3, and each side of the short plate of the sealing block 5 is set to an oblique angle, and the oblique angle is fixedly connected to the pipe wall of the water-cooled wall 6.

[0054] In this embodiment: the material of the sealing filler block is the same as that of the water-cooled wall. This device mainly uses two long sealing fillers and four short sealing fillers.

[0055] Other implementations are the same as the first specific implementation.

[0056] Specific embodiment ten: A wall-penetrating pipe sealing device capable of absorbing expansion, wherein the expansion joint 3 comprises a bellows 3-1, two end pipes 3-2 and two end flanges 3-3;

[0057] Each end of the bellows 3 - 1 is connected to an end flange 3 - 3 through an end pipe 3 - 2 , one end flange 3 - 3 is fixedly connected to the sealing flange plate 2 , and the other end flange 3 - 3 is fixedly connected to the sealing packing block 5 .

[0058] In this embodiment: the flange and the end pipe are both made of alloy steel, wherein there is a square groove in the middle of the end pipe, and the bellows are made of stainless steel; one flange is welded and fixed to the sealing flange plate, and the other flange is welded and fixed to multiple sealing filler blocks on the water-cooled wall; the annular bellows is folded along the circumference to form a peak section L1 and a trough section L2, and the peak section L1 and the trough section L2 are staggeredly distributed along the circumference to form the circumferential corrugation, and in the cross section of the circumferential bellows, the contour line of the peak section L1 or the trough section L2 is an arc curve

[0059] The expansion joint mainly uses bellows to absorb the expansion displacement difference. The bellows is composed of multiple units, which can absorb the expansion difference and decompose it into multiple units. The expansion difference and stress of each unit are small and will not be superimposed, reducing the displacement and stress to a safe level.

[0060] Other implementations are the same as the first specific implementation.

Claims

1. A wall-penetrating pipe sealing device capable of absorbing expansion, characterized in that: It comprises a sealing flange plate (2), an expansion joint (3), a water-cooled wall (6), a plurality of sleeves (1) and a plurality of wall-penetrating pipes (7); The water-cooled wall (6) is used for being arranged in the furnace wall to circulate cold water to cool the furnace wall. A plurality of through-wall pipes (7) pass through the furnace wall in the middle of the water-cooled wall (6). Each sleeve (1) is sleeved on a through-wall pipe (7). The portion of each through-wall pipe (7) located below the water-cooled wall (6) is fixedly connected to a sleeve (1). The plurality of sleeves (1) pass through a sealing flange plate (2) and are fixedly connected to the sealing flange plate (2). The top of the sealing flange plate (2) is fixedly connected to an expansion joint (3). The expansion joint (3) is arranged around the outside of the plurality of sleeves (1). The top of the expansion joint (3) is fixedly connected to the water-cooled wall (6).

2. The wall-penetrating pipe sealing device capable of absorbing expansion according to claim 1, characterized in that: The sleeve (1) is connected to the wall-penetrating pipe (7) by welding.

3. The wall-penetrating pipe sealing device capable of absorbing expansion according to claim 1, characterized in that: A cylinder (4) is arranged outside the expansion joint (3), the bottom of the cylinder (4) is fixedly connected to the bottom of the expansion joint (3), and a gap is left between the top of the cylinder (4) and the water-cooled wall (6).

4. The wall-penetrating pipe sealing device capable of absorbing expansion according to claim 3, characterized in that: The gap is 90mm-110mm.

5. The wall-penetrating pipe sealing device capable of absorbing expansion according to claim 3, characterized in that: The bottom of the cylinder (4) is provided with a circle of rooting steel plates (8) extending inwards, and the rooting steel plates (8) are fixedly connected to the bottom of the expansion joint (3).

6. The wall-penetrating pipe sealing device capable of absorbing expansion according to claim 5, characterized in that: The rooting steel plate (8) is welded to the bottom of the expansion joint (3).

7. The wall-penetrating pipe sealing device capable of absorbing expansion according to claim 1, characterized in that: A sealing filler block (5) is fixed between every two adjacent tube walls on the water-cooled wall (6), and the top of the expansion joint (3) is fixedly connected to the plurality of sealing fillers (5).

8. The wall-penetrating pipe sealing device capable of absorbing expansion according to claim 7, characterized in that: The top of the expansion joint (3) is welded to a plurality of sealing blocks (5).

9. The wall-penetrating pipe sealing device capable of absorbing expansion according to claim 8, characterized in that: The sealing filler block (5) is L-shaped, and the corners of the sealing filler block (5) are arc-shaped. The long plate of the sealing filler block (5) is fixedly connected to the expansion joint (3), and each side of the short plate of the sealing filler block (5) is set to an oblique angle, and the oblique angle is fixedly connected to the tube wall of the water-cooled wall (6).

10. The wall-penetrating pipe sealing device capable of absorbing expansion according to claim 1, characterized in that: The expansion joint (3) comprises a bellows (3-1), two end pipes (3-2) and two end flanges (3-3); Each end of the bellows (3-1) is connected to an end flange (3-3) via an end pipe (3-2), one end flange (3-3) is fixedly connected to a sealing flange plate (2), and the other end flange (3-3) is fixedly connected to a sealing packing block (5).

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