Connecting structure of expansion gap between front wall water cooling wall and air chamber

Abstract

The utility model discloses a connecting structure of an expansion gap between a front wall water-cooled wall and an air chamber, which comprises a hearth, the air chamber, the front wall water-cooled wall and the expansion gap, a first pouring material layer is laid at the top end of the outer wall of the air chamber, and a second pouring material layer extends along the expansion gap on one side, close to the front wall water-cooled wall, of the first pouring material layer. A first gap is formed between the second pouring material layer and the front wall water cooling wall; a third pouring material layer is laid on the inner wall of the hearth, and the third pouring material layer close to one side of the expansion gap extends downwards to form a fourth pouring material layer covering the expansion gap; a second gap is formed between the bottom end of the fourth pouring material layer and the top ends of the first pouring material layer and the second pouring material layer, and a third gap is formed between the fourth pouring material layer and the front wall water cooling wall; the first gap, the second gap and the third gap are filled with elastic materials.

Description

Technical Field

[0001] The utility model relates to the technical field of fluidized bed boilers, in particular to a connection structure of an expansion joint between a front wall water-cooled wall and a wind chamber. Background Art

[0002] The circulating fluidized bed boiler is surrounded by membrane water-cooled walls, which are the wind chamber and furnace from bottom to top. The wind chamber is connected to the furnace through an air distribution plate, and the side walls of the wind chamber are also water-cooled walls. The membrane water-cooled walls around the circulating fluidized bed boiler are the front wall water-cooled wall, the rear wall water-cooled wall and the side wall water-cooled wall. An expansion joint is left between the front wall water-cooled wall and the wind chamber. In order to prevent the ash from the furnace from entering the expansion joint between the front wall water-cooled wall and the wind chamber water-cooled wall, casting material is laid between the front wall water-cooled wall and the top of the wind chamber.

[0003] At present, circulating fluidized bed boilers will produce a certain amount of expansion difference during operation. Since the wind chamber water-cooled wall and the front wall water-cooled wall in the furnace are two independent parts, there are different expansion differences between the two parts due to uneven heating during operation, which will cause the castable to break or be crushed. Once the castable is broken, it will fall along the expansion joint between the wind chamber water-cooled wall and the front wall water-cooled wall. At the same time, there is no castable protection above the gap between the wind chamber water-cooled wall and the front wall water-cooled wall, which will cause the ash at the bottom of the bed to fall into the expansion joint between the wind chamber water-cooled wall and the front wall water-cooled wall continuously.

[0004] Casting materials, ash, etc. that fall into the expansion joint make it impossible for the wind chamber water-cooled wall and the front wall water-cooled wall to shrink, and the front wall water-cooled wall will continue to expand outward. It is difficult to make the gap smaller during expansion because the gap between the wind chamber water-cooled wall and the front wall water-cooled wall is occupied after the casting materials and ash fall in. The gap will only continue to increase and it will be difficult to shrink. Eventually, the gap between the wind chamber water-cooled wall and the front wall water-cooled wall becomes larger and larger, which may cause the tube screen connection between the front wall water-cooled wall and the side wall water-cooled wall to be torn, resulting in a non-shutdown accident of the circulating fluidized bed boiler leakage unit, which poses a safety hazard to the operation of the circulating fluidized bed boiler. Utility Model Content

[0005] The utility model aims to provide a connection structure of an expansion joint between a front wall water-cooling wall and a wind chamber.

[0006] The utility model is implemented by the following technical scheme: a connection structure of an expansion joint between a front wall water-cooled wall and a wind chamber, which comprises a furnace, a wind chamber, a front wall water-cooled wall, and an expansion joint;

[0007] A first casting material layer is laid on the top of the outer wall of the wind chamber, the first casting material layer is close to the side of the front wall water-cooling wall, a second casting material layer extends along the expansion joint, and a first gap is provided between the second casting material layer and the front wall water-cooling wall;

[0008] A third casting material layer is laid on the inner wall of the furnace, and the third casting material layer close to the expansion joint side extends downward to form a fourth casting material layer covering the expansion joint;

[0009] A second gap is provided between the bottom end of the fourth casting material layer and the top ends of the first casting material layer and the second casting material layer, and a third gap is provided between the fourth casting material layer and the front wall water-cooling wall;

[0010] The first gap, the second gap and the third gap are filled with elastic material.

[0011] Furthermore, the elastic material is ceramic fiber.

[0012] Furthermore, a first bracket and a second bracket that cooperate with each other are provided in the expansion joint, the first bracket is placed at the bottom of the second casting material layer and fixedly connected to the water-cooled wall of the wind chamber; the second bracket is placed at the bottom of the elastic material and fixedly connected to the front wall water-cooled wall.

[0013] Furthermore, the first bracket and the second bracket have the same structure, the first bracket includes a plurality of reinforcing plates and a horizontally arranged bottom plate, a plurality of evenly arranged reinforcing plates are vertically fixed to the top of the bottom plate, the reinforcing plates are fixedly connected to the water-cooled wall of the wind chamber, and a groove matching the water-cooled wall of the wind chamber is opened on one side of the bottom plate.

[0014] Furthermore, grabbing nails are provided between the first casting material layer and the second casting material layer, inside the second casting material layer, and inside the third casting material layer; the grabbing nails inside the second casting material layer are fixedly connected to the water-cooled wall of the wind chamber, and the grabbing nails inside the third casting material layer are fixedly connected to the inner wall of the furnace.

[0015] Advantages of the utility model:

[0016] The elastic material is ceramic fiber. Taking advantage of its light weight and high temperature resistance, the wind chamber water-cooled wall and the front wall water-cooled wall can be freely adjusted when expanding and contracting under the cooperation of each casting material layer, effectively preventing ash from entering the expansion joint from the gap between the first casting material layer and the fourth casting material layer, and between the first casting material layer and the front wall water-cooled wall. It effectively solves the problem of the casting material falling into the expansion joint between the wind chamber water-cooled wall and the front wall water-cooled wall after disintegration, and can also prevent ash from entering the expansion joint, effectively solving the problem that the expansion joint between the wind chamber water-cooled wall and the front wall water-cooled wall cannot be restored, and solves the problem of economic losses caused by the tearing of the connection between the wind chamber front wall water-cooled wall and the side wall pipe screen;

[0017] With the cooperation of the first bracket and the second bracket, the second castable and elastic material in the expansion joint are supported, reducing the problem of falling and blocking the expansion joint. At the same time, the first bracket and the second bracket are movable together without affecting the expansion and contraction of the expansion joint. The first bracket and the second bracket play an intercepting role in preventing the castable from breaking and falling off under high temperature conditions, and can have a good preventive effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 for Figure 1 A is a partial enlarged schematic diagram;

[0021] Figure 3 It is a front view of the first bracket in the utility model;

[0022] Figure 4 It is a side view of the first bracket in the utility model;

[0023] Figure 5 It is a top view of the first bracket in the utility model;

[0024] In the figure: furnace 1, wind chamber 2, front wall water-cooled wall 3, expansion joint 4, first casting material layer 5, second casting material layer 6, first gap 7, third casting material layer 8, fourth casting material layer 9, slag dropping pipe 10, second gap 11, third gap 12, first bracket 13, second bracket 14, reinforcement plate 15, bottom plate 16, grab nails 17, elastic material 18, notch 19. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] like Figure 1-5As shown, the connection structure of the expansion joint between the front wall water-cooled wall and the wind chamber includes a furnace 1, a wind chamber 2, a front wall water-cooled wall 3, and an expansion joint 4. The function of the expansion joint 4 is to ensure that when the wind chamber 2 and the furnace 1 expand due to heat, the expansion performance can be guaranteed when the expansion coefficients are different.

[0027] A first casting material layer 5 is laid on the top of the outer wall of the air chamber 2. A second casting material layer 6 is extended along the expansion joint 4 on one side of the first casting material layer 5 close to the front wall water-cooling wall 3. A first gap 7 is provided between the second casting material layer 6 and the front wall water-cooling wall 3.

[0028] The inner wall of the furnace 1 is paved with a third casting material layer 8, the third casting material layer 8 is close to the expansion joint 4, and a fourth casting material layer 9 is extended downward to cover the expansion joint 4. The fourth casting material layer 9 has a certain guiding function, which guides the ash and other materials inside the furnace 1 to the slag dropping pipe 10 inside the wind chamber 2, and at the same time covers the expansion joint 4 to effectively reduce the ash and slag entering the expansion joint 4. The first casting material layer 5, the second casting material layer 6, the third casting material layer 8 and the fourth casting material layer 9 are refractory and thermal insulation casting materials.

[0029] A second gap 11 is provided between the bottom end of the fourth casting material layer 9 and the top ends of the first casting material layer 5 and the second casting material layer 6, and a third gap 12 is provided between the fourth casting material layer 9 and the front wall water-cooling wall 3;

[0030] The first gap 7, the second gap 11 and the third gap 12 are filled with elastic material 18, and the elastic material 18 is ceramic fiber. Taking advantage of its light weight and high temperature resistance, the water-cooled wall of the wind chamber 2 and the front wall water-cooled wall 3 can be freely adjusted during expansion and contraction under the cooperation of various casting material layers, effectively preventing ash from entering the expansion joint 4 from the gap between the first casting material layer 5 and the fourth casting material layer 9 and between the first casting material layer 5 and the front wall water-cooled wall 3, effectively solving the problem of the casting material falling into the expansion joint 4 between the water-cooled wall of the wind chamber 2 and the front wall water-cooled wall 3 after disintegration, and also preventing ash from entering the expansion joint 4, effectively solving the problem that the expansion joint 4 between the water-cooled wall of the wind chamber 2 and the front wall water-cooled wall 3 cannot be restored, and solving the problem of economic losses caused by the tearing of the connection between the front wall water-cooled wall 3 and the side wall tube screen of the wind chamber 2.

[0031] A first bracket 13 and a second bracket 14 that cooperate with each other are provided in the expansion joint 4. The first bracket 13 is placed at the bottom of the second casting material layer 6 and is fixedly connected to the water-cooled wall of the wind chamber 2; the second bracket 14 is placed at the bottom of the elastic material 18 and is fixedly connected to the front wall water-cooled wall 3; with the cooperation of the first bracket 13 and the second bracket 14, the second casting material and the elastic material 18 in the expansion joint 4 are supported, reducing the problem of falling and clogging the expansion joint 4. At the same time, the first bracket 13 and the second bracket 14 are flexibly cooperated, which does not affect the expansion and contraction of the expansion joint 4. The first bracket 13 and the second bracket 14 play an interception role in preventing the casting material from breaking and falling off under high temperature conditions, and can have a good preventive effect.

[0032] The first bracket 13 and the second bracket 14 have the same structure. The first bracket 13 includes a plurality of reinforcing plates 15 and a horizontally arranged bottom plate 16. A plurality of evenly arranged reinforcing plates 15 are vertically fixed to the top of the bottom plate 16. The function of the reinforcing plates 15 is to increase the contact area between the first bracket 13 and the water-cooled wall of the wind chamber 2 and improve the stability. The reinforcing plates 15 are fixedly connected to the water-cooled wall of the wind chamber 2. A notch 19 matching the water-cooled wall of the wind chamber 2 is provided on one side of the bottom plate 16. The first bracket 13 is clamped and fixed to the water-cooled wall of the wind chamber 2 through the notch 19. Similarly, the function of the reinforcing plates 15 on the second bracket 14 is to increase the contact area between the second bracket 14 and the front wall water-cooled wall 3 and improve the stability of the second bracket 14.

[0033] Grabbing nails 17 are provided between the first casting material layer 5 and the second casting material layer 6, inside the second casting material layer 6, and inside the third casting material layer 8; the grabbing nails 17 inside the second casting material layer 6 are fixedly connected to the water-cooled wall of the wind chamber 2, and the grabbing nails 17 inside the third casting material layer 8 are fixedly connected to the inner wall of the furnace 1. The grabbing nails 17 are used to increase the stability of the connection between the casting material layers and between the casting material layers and the circulating fluidized bed boiler body structure.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A connection structure of an expansion joint between a front wall water-cooled wall and a wind chamber, comprising a furnace, a wind chamber, a front wall water-cooled wall, and an expansion joint, characterized in that: A first casting material layer is laid on the top of the outer wall of the wind chamber, the first casting material layer is close to the side of the front wall water-cooling wall, a second casting material layer extends along the expansion joint, and a first gap is provided between the second casting material layer and the front wall water-cooling wall; The inner wall of the furnace is paved with a third casting material layer, and the third casting material layer close to the expansion joint side extends downward to form a fourth casting material layer covering the expansion joint; A second gap is provided between the bottom end of the fourth casting material layer and the top ends of the first casting material layer and the second casting material layer, and a third gap is provided between the fourth casting material layer and the front wall water-cooling wall; The first gap, the second gap and the third gap are filled with elastic material.

2. The connection structure of the expansion joint between the front wall water-cooling wall and the wind chamber according to claim 1 is characterized in that: The elastic material is ceramic fiber.

3. The connection structure of the expansion joint between the front wall water-cooling wall and the wind chamber according to claim 2 is characterized in that: A first bracket and a second bracket that cooperate with each other are provided in the expansion joint. The first bracket is placed at the bottom of the second casting material layer and fixedly connected to the water-cooled wall of the wind chamber; the second bracket is placed at the bottom of the elastic material and fixedly connected to the front wall water-cooled wall.

4. The connection structure of the expansion joint between the front wall water-cooling wall and the wind chamber according to claim 3 is characterized in that: The first bracket and the second bracket have the same structure. The first bracket includes a plurality of reinforcing plates and a horizontally arranged bottom plate. A plurality of evenly arranged reinforcing plates are vertically fixed to the top of the bottom plate. The reinforcing plates are fixedly connected to the water-cooled wall of the air chamber. A groove matching the water-cooled wall of the air chamber is opened on one side of the bottom plate.

5. The connection structure of the expansion joint between the front wall water-cooling wall and the wind chamber according to claim 4, characterized in that: Grabbing nails are provided between the first casting material layer and the second casting material layer, inside the second casting material layer, and inside the third casting material layer; the grabbing nails inside the second casting material layer are fixedly connected to the water-cooled wall of the wind chamber, and the grabbing nails inside the third casting material layer are fixedly connected to the inner wall of the furnace.

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