Membrane type furnace lining fire-resistant hanging brick structure of waste heat boiler

Abstract

A membrane type wall furnace lining fire-resistant hanging brick structure of a waste heat boiler comprises a membrane type wall, a plurality of fire-resistant hanging bricks, embedded fasteners and a soft heat insulation pad, the membrane type wall comprises a plurality of flat steel and heat exchange tubes, the embedded fasteners are fixedly arranged on the flat steel on one side of the inner wall face of the membrane type wall, and the soft heat insulation pad is arranged on the heat exchange tubes. Mounting holes matched with the embedded fasteners in an inserted mode are formed in the fire-resistant hanging bricks, the fire-resistant hanging bricks are detachably and fixedly connected with the embedded fasteners respectively, and the fire-resistant hanging bricks are spliced to form an arc-shaped hanging brick layer matched with the heat exchange tubes according to the diameters and arrangement of the heat exchange tubes. The soft heat insulation pad is laid between the fireproof hanging bricks and the membrane type wall and attached to the outline of the membrane type wall. The detachable fire-resistant hanging brick structure is designed on the inner wall of the membrane type wall, traditional fire-resistant castable is replaced, adjustment, replacement and reassembly can be conducted according to the thermal load working condition of the membrane type wall through detachable connection of the fire-resistant hanging bricks and the embedded fasteners, and the membrane type wall has the adjusting function.

Description

Technical Field

[0001] The utility model relates to the technical field of solid waste incineration treatment, and particularly relates to a refractory hanging brick structure for a membrane wall furnace lining of a waste heat boiler. Background Art

[0002] A waste heat boiler refers to a boiler that heats water to a certain temperature by using the waste heat in waste gas, waste materials or waste liquid in various industrial processes and the heat generated by the combustion of combustible substances therein.

[0003] Membrane wall: A membrane wall refers to a water-cooled wall composed of an airtight tube screen formed by arranging and welding flat steel and tubes.

[0004] The membrane wall waste heat boiler is arranged behind the incineration equipment to reduce the flue gas temperature and recover waste heat. Sometimes, it is required to have adjustable load to meet different working conditions. Refractory castable has the advantages of high temperature resistance, corrosion resistance, erosion resistance, etc., and can be used to adjust the thermal resistance. It is commonly used as the inner lining of the membrane wall to meet the requirement of adjusting the heat load capacity of the membrane wall. The refractory castable is lined under low load conditions and removed under high load conditions.

[0005] Refractory castable: Refractory castable refers to a mixture composed of refractory aggregates, binders and additives, which is mixed with water (or liquid binders) to form a mud that can be constructed by casting method.

[0006] In the prior art, the refractory castable is supported by studs welded on the flat steel of the membrane wall and forms a firm whole after sintering. It has the following disadvantages: the removal of the refractory castable is very difficult, and mechanical tools such as pneumatic picks, electric hammers, cutting machines, impact hammers, etc. are required to knock, drill or cut the refractory castable. The removal process is time-consuming and laborious and is extremely likely to damage the heat exchange tubes of the membrane wall.

[0007] Therefore, the purpose of the present invention is to provide a membrane wall hanging brick structure, which has a simple structure, is convenient for disassembly and assembly, and can effectively overcome the defects of the prior art. Content of the Utility Model

[0008] In order to solve the above technical deficiencies, the utility model provides a refractory hanging brick structure for a membrane wall furnace lining of a waste heat boiler.

[0009] The technical solution of the utility model: A refractory hanging brick structure for a membrane wall furnace lining of a waste heat boiler, including a membrane wall, a plurality of refractory hanging bricks, embedded fasteners, and soft thermal insulation pads. The membrane wall includes a plurality of flat steels and heat exchange tubes. A plurality of embedded fasteners are fixedly arranged on the flat steel on one side of the inner wall surface of the membrane wall. A plurality of installation holes adapted to be inserted into the embedded fasteners are arranged on the plurality of refractory hanging bricks. The plurality of refractory hanging bricks are respectively detachably fixedly connected to the respective embedded fasteners, and each refractory hanging brick is spliced into an arc-shaped hanging brick layer adapted thereto according to the diameter and arrangement of the heat exchange tubes.

[0010] The soft heat insulation pad is laid between the refractory hanging bricks and the membrane wall and conforms to the contour of the membrane wall.

[0011] With the above technical solution, the hanging bricks are made into the same arc according to the diameter and arrangement of the heat exchange tubes of the membrane wall, so that the ceramic fiber blanket can be compressed relatively evenly.

[0012] A further setting of the present utility model: The embedded fastener includes a threaded shaft portion and a welded end portion. The welded end portion is provided with a 60° chamfer and is welded and fixed to the flat steel.

[0013] The installation hole is a counterbore. The counterbore includes a large-diameter end on the side away from the flat steel and a small-diameter end on the side close to the flat steel. The small-diameter end is adapted to the diameter of the threaded shaft portion. The diameter of the large-diameter end is larger than that of the threaded shaft portion. The threaded shaft portion passes through the small-diameter end and extends into the large-diameter end, and is threadedly fastened to a hexagon nut. Between the hexagon nut and the bottom surface of the large-diameter end, a spring washer and a plain washer sleeved on the threaded shaft portion are provided.

[0014] A further setting of the present utility model: After the large-diameter end of the installation hole is locked by the hexagon nut, it is filled with refractory plastic mass.

[0015] With the above technical solution, refractory plastic mass: Refractory plastic mass is made of refractory aggregate and powder, raw clay, chemical composite binder and additives. After being formulated, kneaded, extruded into brick blank shape, and stored in packaging for a certain time, it still has good plasticity and can be constructed by ramming method.

[0016] A further setting of the present utility model: The soft heat insulation pad is a ceramic fiber blanket, and the ceramic fiber blanket is provided with a number of through holes adapted to the positions of each fastening embedded part.

[0017] With the above technical solution, a layer of ceramic fiber blanket is lined and compressed between the hanging bricks and the membrane wall. The ceramic fiber blanket has a low thermal conductivity, can effectively increase the thermal resistance, reduce the thickness of the hanging bricks, and the softness of the fiber blanket makes it have good conformity with both the membrane wall and the hanging bricks.

[0018] A further setting of the present utility model: An expansion gap is provided between each refractory hanging brick and the adjacent refractory hanging brick.

[0019] With the above technical solution, a gap is reserved between the hanging bricks to absorb the expansion of the bricks.

[0020] The beneficial effect of the present utility model: By designing a detachable refractory hanging brick structure on the inner wall of the membrane wall in this application, the traditional refractory castable is replaced. Using the detachable connection of the refractory hanging bricks and the embedded fasteners, it can be adjusted, replaced, and reassembled according to the heat load condition of the membrane wall, so that the membrane wall has the function of adjustment.

[0021] It is welded to the flat steel of the membrane wall 1 through the embedded screw 5. The ceramic fiber blanket 2 is filled between the hanging brick 3 and the membrane wall 1 until it is full. The hole of the hanging brick 3 is passed through the embedded screw 5, and then the flat washer 8, spring washer 7 and hexagon nut 6 are installed in sequence. After the hexagon nut 6 is tightened, the refractory plastic 4 is covered in the circular hole groove of the hanging brick 3.

[0022] By utilizing the characteristic that the ceramic fiber blanket has a low thermal conductivity coefficient, it can effectively increase the thermal resistance and reduce the thickness of the hanging brick. Moreover, the softness of the fiber blanket enables it to have good adhesion with both the membrane wall and the hanging brick, avoiding damage to the heat exchange tubes of the membrane wall during the assembly and disassembly process of the refractory hanging bricks. And the layout setting between each refractory hanging brick makes the same arc corresponding to the diameter and arrangement of the membrane wall heat exchange tubes, so that the ceramic fiber blanket can be compressed relatively evenly to complement each other.

[0023] After the refractory hanging brick is thread-fastened, the large-diameter end of the installation hole is covered with refractory plastic to seal the installation hole and protect the fasteners, avoiding high-temperature loss of the fasteners and making it difficult to disassemble. A gap is reserved between the hanging bricks to absorb the expansion of the bricks for easy disassembly. Description of the Drawings

[0024] Figure 1 is the structure of the embodiment of the present utility model Figure 1 ;

[0025] Figure 2 is the installation cross-sectional view of the embodiment of the present utility model;

[0026] The reference numerals in the drawings are respectively: membrane wall - 1, flat steel - 11, ceramic fiber blanket - 2, refractory hanging brick - 3, installation hole - 31, expansion gap - 32, refractory plastic - 4, embedded screw - 5, threaded shaft part - 51, hexagon nut - 6, spring washer - 7, flat washer - 8.

[0027] To better illustrate this embodiment, some components in the drawings are omitted, enlarged or reduced, which do not represent the dimensions of the actual product. In addition, the drawings are only for illustrative purposes and cannot be construed as a limitation to this patent. Detailed Embodiment

[0028] To make the technical solutions of this application and their advantages clearer, the technical solutions of this application will be further described clearly and completely in detail below in conjunction with the drawings. It can be understood that the specific embodiments described herein are only part of the embodiments of this application, which are only used to explain this application and are not a limitation to this application. It should be noted that for the convenience of description, only the parts related to this application are shown in the drawings, and other related parts can refer to the usual design. Without conflict, the embodiments in this application and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0029] The following will introduce the present utility model in detail with reference to the accompanying drawings. As Figure 1-2 shown, a structure of refractory hanging bricks 3 for the furnace lining of a membrane wall 1 of a waste heat boiler includes a membrane wall 1, several refractory hanging bricks 3, embedded fasteners 5, and a soft thermal insulation pad. The membrane wall 1 includes several flat steels 11 and heat exchange tubes. A plurality of embedded fasteners 5 are fixedly arranged on the flat steel 11 on one side of the inner wall surface of the membrane wall 1. A plurality of mounting holes 31 adapted to be inserted into the embedded fasteners 5 are provided on each of the several refractory hanging bricks 3. The several refractory hanging bricks 3 are respectively detachably fixedly connected to the respective embedded fasteners 5, and each refractory hanging brick 3 is spliced according to the diameter and arrangement of the heat exchange tubes to form an arc-shaped hanging brick layer adapted thereto;

[0030] The soft thermal insulation pad is laid between the refractory hanging bricks 3 and the membrane wall 1 and conforms to the contour of the membrane wall 1.

[0031] The hanging bricks are made into the same arc according to the diameter and arrangement of the heat exchange tubes of the membrane wall 1, so that the ceramic fiber blanket 2 can be compressed relatively evenly.

[0032] The embedded fastener 5 includes a threaded shaft portion 51 and a welded end. The welded end is provided with a 60° chamfer and is welded and fixed to the flat steel 11;

[0033] The mounting hole 31 is a countersunk hole. The countersunk head includes a large-diameter end on the side away from the flat steel 11 and a small-diameter end close to the flat steel 11. The small-diameter end is adapted to the diameter of the threaded shaft portion 51. The diameter of the large-diameter end is larger than that of the threaded shaft portion 51. The threaded shaft portion 51 passes through the small-diameter end and extends into the large-diameter end, and is threadedly fastened to the hexagonal nut 6. Between the bottom surface of the hexagonal nut 6 and the large-diameter end, a spring washer 7 and a flat washer 8 sleeved on the threaded shaft portion 51 are provided.

[0034] After the hexagonal nut 6 is tightened, the large-diameter end of the mounting hole 31 is filled with refractory plastic 4.

[0035] Refractory plastic 4: Refractory plastic 4 is made of refractory aggregates and powders, raw clay, chemical composite binders and additives. After being formulated, kneaded, extruded into brick blank shape, and stored for a certain time, it still has good plasticity and can be constructed by ramming method.

[0036] The soft thermal insulation pad is a ceramic fiber blanket 2. The ceramic fiber blanket 2 is provided with a plurality of through holes adapted to the positions of the respective fastening embedded parts.

[0037] A layer of ceramic fiber blanket 2 is lined and compressed between the hanging bricks and the membrane wall 1. The ceramic fiber blanket 2 has a low thermal conductivity, can effectively increase the thermal resistance, reduce the thickness of the hanging bricks, and the softness of the fiber blanket makes it have good adhesion to both the membrane wall 1 and the hanging bricks.

[0038] An expansion gap 32 is provided between each refractory hanging brick 3 and the adjacent refractory hanging brick 3.

[0039] A gap is reserved between the hanging bricks to absorb the expansion of the bricks.

[0040] In this application, a detachable refractory hanging brick 3 structure is designed on the inner wall of the membrane wall 1, replacing the traditional refractory castable. By using the detachable connection between the refractory hanging brick 3 and the embedded fastener 5, adjustment, replacement and reassembly can be carried out according to the heat load condition of the membrane wall 1, enabling the membrane wall 1 to have an adjustment function.

[0041] Taking advantage of the characteristic that the ceramic fiber blanket 2 has a relatively low thermal conductivity, the thermal resistance can be effectively increased and the thickness of the hanging brick can be reduced. Moreover, the softness of the fiber blanket enables it to have good adhesion to both the membrane wall 1 and the hanging bricks, avoiding damage to the heat exchange tubes of the membrane wall 1 during the assembly and disassembly process of the refractory hanging bricks 3. In addition, the layout of the refractory hanging bricks 3 is set to make the same arc corresponding to the diameter and arrangement of the heat exchange tubes of the membrane wall 1, so that the ceramic fiber blanket 2 can be compressed relatively evenly to complement each other.

[0042] After the refractory hanging brick 3 is thread-fastened, the large-diameter end of the mounting hole 31 is covered with refractory plastic 4 to seal the mounting hole 31 and protect the fastener from high-temperature loss, which may lead to difficult disassembly. A gap is reserved between the hanging bricks to absorb the expansion of the bricks for easy disassembly.

[0043] It can be understood that for those skilled in the art, any equivalent replacement or change to the technical solution and the inventive concept of the present utility model should fall within the protection scope of the appended claims of the present utility model.

Claims

1. A membrane-type fireplace lining refractory hanging brick structure for a waste heat boiler, characterized in that: It includes a membrane wall, a plurality of refractory hanging bricks, embedded fasteners, and a soft heat insulation pad. The membrane wall includes a plurality of flat steels and heat exchange tubes. A plurality of embedded fasteners are fixedly arranged on the flat steel on one side of the inner wall of the membrane wall. The plurality of refractory hanging bricks are provided with mounting holes that are plugged and matched with the embedded fasteners. The plurality of refractory hanging bricks are respectively detachably fixedly connected with the embedded fasteners, and the refractory hanging bricks are spliced ​​according to the diameter and arrangement of the heat exchange tubes to form an arc-shaped hanging brick layer that is matched therewith. The soft heat-insulating pad is laid between the refractory hanging bricks and the membrane wall and fits the contour of the membrane wall.

2. The membrane-type fireplace lining refractory hanging brick structure of a waste heat boiler according to claim 1, characterized in that: The embedded fastener comprises a threaded shaft portion and a welding end portion, wherein the welding end portion is provided with a 60° chamfer and is welded and fixed to the flat steel; The mounting hole is a countersunk hole, which includes a large diameter end on one side of the flat steel and a small diameter end close to the flat steel. The small diameter end is adapted to the diameter of the threaded shaft, and the large diameter end has a larger diameter than the threaded shaft. The threaded shaft passes through the small diameter end and extends into the large diameter end, and is threadedly fastened with a hexagonal nut. A spring washer and a flat washer are provided between the hexagonal nut and the bottom surface of the large diameter end and are sleeved on the threaded shaft.

3. The membrane-type fireplace lining refractory hanging brick structure of a waste heat boiler according to claim 2, characterized in that: The large diameter end of the mounting hole is filled with refractory plastic after the hexagonal nut is tightened.

4. The membrane type fireplace lining refractory hanging brick structure of a waste heat boiler according to claim 1, characterized in that: The soft heat-insulating pad is a ceramic fiber blanket, and the ceramic fiber blanket is provided with a plurality of through holes corresponding to the positions of the fastening embedded parts.

5. The membrane type fireplace lining refractory hanging brick structure of a waste heat boiler according to claim 1, characterized in that: An expansion gap is provided between each refractory hanging brick and adjacent refractory hanging bricks.

Images