A method for laying a waste heat furnace wall structure

Abstract

The present invention discloses a method for laying a furnace wall structure of a waste heat furnace, including a waste heat furnace, a plurality of heat-resistant plate nails are arranged on the inner side wall of the waste heat furnace, a first ceramic fiber paper is pasted on the surface of the steel plate of the waste heat furnace boiler, a first poly light brick is laid on the surface of the first ceramic fiber paper away from the boiler, a second ceramic fiber paper is pasted on the surface of the first poly light brick, and a second poly light brick is laid on the surface of the second ceramic fiber paper. The present invention can effectively prevent cracks from occurring in the furnace wall, has a multi-layer structure construction, has a better sealing effect, reduces temperature loss, effectively prevents the furnace wall from tipping over and bricks from falling off, greatly improves production efficiency, and greatly extends the service life of the waste heat furnace.

Description

Technical Field

[0001] The invention relates to the field of steel plate protection structures for waste heat furnaces, in particular to a method for laying a furnace wall structure for a waste heat furnace. Background Art

[0002] In the prior art, the furnace wall structure of the waste heat boiler in the sulfuric acid industry is a layer of insulation bricks and a layer of refractory bricks, with a pull rod at an interval of 500mm up, down, left and right to hold the furnace wall refractory bricks to prevent them from falling over. However, after a long period of use, cracks will appear in the furnace wall, and ash and SO3 gas will enter the furnace wall. The ash will gather and push the refractory bricks of the furnace wall into the furnace. The SO3 furnace will form condensed acid when it encounters the boiler steel plate, corroding the boiler steel plate and the welding point between the pull rod and the steel plate. If it is not discovered in time, the pull rod and the steel plate will be severely corroded and disconnected, and the furnace wall will fall over or bricks will fall off, causing boiler leakage, environmental pollution and mixed safety accidents, shortening the service life of the boiler, seriously affecting normal production and increasing maintenance costs. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art in which gaps are formed between the refractory insulation layer and the furnace wall due to long-term use, as well as the furnace wall collapse, and to provide a method for laying the furnace wall structure of a waste heat furnace.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A method for laying a furnace wall structure of a waste heat furnace, comprising a multi-layer structure laid on the surface of the waste heat furnace, wherein a boiler steel plate is arranged on the inner side wall of the waste heat furnace, a plurality of heat-resistant plate nails are arranged on the boiler steel plate, the heat-resistant plate nails are welded to the boiler steel plate, a first ceramic fiber paper is attached to the surface of the boiler steel plate, a first poly light brick is laid on the surface of the first ceramic fiber paper away from the boiler, a second ceramic fiber paper is attached to the surface of the first poly light brick, a second ceramic fiber paper is attached to the surface of the second ceramic fiber paper, a second poly light brick is laid on the surface of the second ceramic fiber paper, asphalt paint is applied to the surface of the second poly light brick, a plurality of the heat-resistant plate nails sequentially penetrate the first ceramic fiber paper, the first poly light brick, the second ceramic fiber paper and the second poly light brick, a drilling hole is opened at the outlet end of the plurality of the heat-resistant plate nails, a V-shaped nail is installed in the drilling hole, a bent end of the V-shaped nail is welded to the drilling hole, and the V-shaped nail is covered and wrapped by high-strength refractory plastic concrete;

[0006] The method for laying the waste heat furnace wall structure is as follows:

[0007] (1) First, a plurality of heat-resistant plate nails are welded on the steel plate of the inner wall of the waste heat furnace, and holes are drilled at the protruding ends of the plurality of heat-resistant plate nails;

[0008] (2) a first ceramic fiber paper is pasted on the surface of the steel plate on the inner side wall of the waste heat furnace, and a plurality of heat-resistant plate nails pass through the first ceramic fiber paper;

[0009] (3) laying first light-weight polymer bricks on the surface of the first ceramic fiber paper, wherein the first light-weight polymer bricks are laid between the heat-resistant plate nails;

[0010] (4) a second ceramic fiber paper is pasted on the surface of the first light-weight brick, and a plurality of heat-resistant plate nails pass through the second ceramic fiber paper;

[0011] (5) A second lightweight polymer brick is laid on the surface of the second ceramic fiber paper, and the second lightweight polymer brick is laid between the heat-resistant plate nails;

[0012] (6) applying asphalt paint on the surface of the second light-weight brick;

[0013] (7) installing a V-shaped nail in the drilled hole;

[0014] (8) welding the bent end of the V-shaped nail to the drilled hole;

[0015] (9) Erect a detachable formwork and use a fastener-type scaffolding to install the formwork;

[0016] (10) pouring high-strength refractory plastic concrete, wherein the thickness of the high-strength refractory plastic concrete is designed according to the thickness of the boiling furnace wall;

[0017] (11) After the high-strength refractory castable cools down, the formwork is removed and the construction is completed;

[0018] The above laying steps cannot be changed, otherwise it will affect the air tightness, thermal insulation and stability.

[0019] A further technical solution is that the first light-weight polymer brick and the second light-weight polymer brick are laid between the heat-resistant plate nails so that the force of the furnace wall pulling the first light-weight polymer brick and the second light-weight polymer brick is evenly distributed, and the first ceramic fiber paper and the second ceramic fiber paper are arranged between the surfaces of the first light-weight polymer brick for thermal insulation and airtightness protection, and V-shaped nails are welded at the protruding ends of the heat-resistant plate nails, which pull the wall tightly.

[0020] A further technical solution is that the force of the heat-resistant plate nails restraining the furnace wall and the force of the furnace wall tilting inward are offset by V-shaped nails, ultimately maintaining a balance of force and preventing gaps from appearing between the furnace wall and the waste heat furnace.

[0021] A further technical solution is that the thickness of the first ceramic fiber paper is set to 2mm-6mm, and the thickness of the second ceramic fiber paper is set to 2mm-6mm.

[0022] A further technical solution is that the thickness of the first ceramic fiber paper and the second ceramic fiber paper are both set to 3 mm.

[0023] A further technical solution is that the thickness of the first light-weight brick is set to 50mm-120mm and the density is 0.5g / cm 3 -1 g / cm 3 The thickness of the second light-weight brick is set to 50mm-120mm, and the density is 0.5g / cm 3 -1 g / cm 3 .

[0024] A further technical solution is that the thickness of the first light-weight brick is 65 mm and the density is 0.8 g / cm 3 The thickness of the second light-weight brick is 114 mm and the density is 0.8 g / cm 3 .

[0025] A further technical solution is that the upper and lower spacing of the heat-resistant plate nails is set to 180mm-240mm, and the left and right spacing is set to 210mm-260mm.

[0026] A further technical solution is that the upper and lower spacing of the heat-resistant plate nails is 200 mm, and the left and right spacing is 235 mm.

[0027] The present invention has the following advantages:

[0028] 1. The present invention can pass the first ceramic fiber paper and the second ceramic fiber paper through the heat-resistant plate nails, and lay the first light-weight brick and the second light-weight brick between the heat-resistant plate nails, so as to effectively prevent cracks from occurring in the furnace wall. The multi-layer structure construction makes the furnace wall and the steel plate wall of the waste heat furnace closely combined, and the sealing effect is better, thereby reducing the temperature loss.

[0029] 2. The present invention arranges V-shaped nails at the protruding ends of the heat-resistant plate nails for reinforcement, which effectively prevents the furnace wall from tipping over and bricks from falling off, greatly improves production efficiency, and greatly extends the service life of the waste heat furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the structure of the present invention

[0031] Figure 2 for Figure 1 Schematic diagram of the cross-section structure in the AA direction

[0032] In the figure, 100, waste heat furnace; 1, boiler steel plate; 2, first ceramic fiber paper; 3, first poly light brick; 4, second ceramic fiber paper; 5, second poly light brick; 6, high-strength refractory plastic concrete; 7, heat-resistant plate nails; 8, V-shaped nails. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] like Figure 1 to Figure 2As shown, a method for laying a furnace wall structure of a waste heat furnace includes a waste heat furnace 100, a plurality of heat-resistant plate nails 7 are arranged on the inner side wall of the waste heat furnace 100, the number of the heat-resistant plate nails 7 is at least 21 per square meter, and the heat-resistant plate nails 7 are welded to the outer surface of the waste heat furnace 100, a first ceramic fiber paper 2 is attached to the surface of the waste heat furnace boiler steel plate 1 to form a first heat insulation layer, the first ceramic fiber paper and the boiler steel plate 1 are tightly fitted by refractory mud, the surface of the first ceramic fiber paper 2 away from the boiler is laid with a first poly light brick 3 to form a first sound insulation layer, and the cross-section of the frame can also be reduced, the first poly light brick 3 and the first ceramic fiber paper 2 are tightly fitted by refractory mud, and then the first poly light brick 3 is A second ceramic fiber paper 4 is attached to the surface to form a second heat insulation layer, a second light-weight brick 5 is laid on the surface of the second ceramic fiber paper 4, and the second ceramic fiber paper 4 and the second light-weight brick 5 are bonded by refractory mud to form a second sound insulation layer, and asphalt paint is applied to the surface of the second light-weight brick 5. After the green paint is air-dried, the heat-resistant plate nails 7 are welded, and a plurality of heat-resistant plate nails 7 pass through the first ceramic fiber paper 2, the first light-weight brick 3, the second ceramic fiber paper 4 and the second light-weight brick 5 in sequence to fix them, and a drill hole is opened at the outlet end of the plurality of heat-resistant plate nails 7, and a V-shaped nail 8 is installed in the drill hole, and the bent end of the V-shaped nail 8 is welded to the drill hole, and finally the V-shaped nail (8) is covered and wrapped by the high-strength refractory plastic concrete 6.

[0040] In this embodiment, the thickness of the insulation layer that can be set on the outside of the existing waste heat boiler is 185mm, and the thickness of the first ceramic fiber paper 2 and the second ceramic fiber paper can be set between 2mm-6mm. After a long period of practice, it is finally selected that the thickness of the first ceramic fiber paper 2 and the second ceramic fiber paper is set to 3mm, which has the best effect, which can not only ensure the sealing performance, but also fit closely with the lightweight bricks.

[0041] In this embodiment, the thickness of the first poly light brick 3 and the second poly light brick 5 is set to 50mm-120mm, and the density is 0.5g / cm 3 -1 g / cm 3 Finally, the thickness of the first light-weight brick 3 is 65 mm and the density is 0.8 g / cm 3 The thickness of the second light brick 5 is 114mm and the density is 0.8g / cm 3 The effect is best, and the thermal insulation effect is gradually enhanced.

[0042] In this embodiment, the upper and lower spacing of the heat-resistant plate nails 7 is set to 180mm-240mm, and the left and right spacing is set to 210mm-260mm.

[0043] Finally, the upper and lower spacing of the heat-resistant plate nails 7 was 200mm and the left and right spacing was 235mm, which made the furnace wall more stable and the tensioning force stronger.

[0044] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. 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 method for laying a waste heat furnace wall structure, characterized in that: The invention comprises a multi-layer structure laid on the surface of a waste heat furnace (100), wherein a boiler steel plate (1) is arranged on the inner side wall of the waste heat furnace (100), a plurality of heat-resistant plate nails (7) are arranged on the boiler steel plate (1), the heat-resistant plate nails (7) are welded to the boiler steel plate (1), a first ceramic fiber paper (2) is attached to the surface of the boiler steel plate (1), a first polycarbonate light brick (3) is laid on the surface of the first polycarbonate light brick (3), a second ceramic fiber paper (4) is attached to the surface of the first polycarbonate light brick (3), and the second ceramic fiber paper (5) is attached to the surface of the first polycarbonate light brick (5). The surface of the first poly light brick (4) is paved with a second poly light brick (5), and asphalt paint is applied to the surface of the second poly light brick (5). A plurality of heat-resistant plate nails (7) sequentially penetrate the first ceramic fiber paper (2), the first poly light brick (3), the second ceramic fiber paper (4) and the second poly light brick (5). A drill hole is provided at the exit end of the plurality of heat-resistant plate nails (7), and a V-shaped nail (8) is installed in the drill hole. The bent end of the V-shaped nail (8) is welded to the drill hole, and the V-shaped nail (8) is covered and wrapped by high-strength fire-resistant plastic concrete (6); The method for laying the waste heat furnace wall structure is as follows: (1) First, a plurality of heat-resistant plate nails are welded on the steel plate of the inner wall of the waste heat furnace, and holes are drilled at the protruding ends of the plurality of heat-resistant plate nails; (2) a first ceramic fiber paper is pasted on the surface of the steel plate on the inner side wall of the waste heat furnace, and a plurality of heat-resistant plate nails pass through the first ceramic fiber paper; (3) laying first light-weight polymer bricks on the surface of the first ceramic fiber paper, wherein the first light-weight polymer bricks are laid between the heat-resistant plate nails; (4) a second ceramic fiber paper is pasted on the surface of the first light-weight brick, and a plurality of heat-resistant plate nails pass through the second ceramic fiber paper; (5) A second lightweight polymer brick is laid on the surface of the second ceramic fiber paper, and the second lightweight polymer brick is laid between the heat-resistant plate nails; (6) applying asphalt paint on the surface of the second light-weight brick; (7) installing a V-shaped nail in the drilled hole; (8) welding the bent end of the V-shaped nail to the drilled hole; (9) Erect a detachable formwork and use a fastener-type scaffolding to install the formwork; (10) pouring high-strength refractory plastic concrete, wherein the thickness of the high-strength refractory plastic concrete is designed according to the thickness of the boiling furnace wall; (11) After the high-strength refractory castable cools down, the formwork is removed and the construction is completed; The above laying steps cannot be changed, otherwise it will affect the air tightness, thermal insulation and stability.

2. The method for laying a waste heat furnace wall structure according to claim 1, characterized in that: The first light-weight brick and the second light-weight brick are laid between the heat-resistant plate nails, so that the force of the furnace wall pulling the first light-weight brick and the second light-weight brick is evenly distributed, and the first ceramic fiber paper and the second ceramic fiber paper are arranged between the surfaces of the first light-weight bricks for thermal insulation and airtightness protection, and V-shaped nails are welded at the protruding ends of the heat-resistant plate nails, which pull the wall tightly.

3. The method for laying a waste heat furnace wall structure according to claim 1, characterized in that: The V-shaped nails are welded on the heat-resistant plate nails, and the force of restraining the furnace wall is offset by the force of the furnace wall tilting inward, thereby ultimately maintaining the balance of force and preventing gaps from appearing between the furnace wall and the waste heat furnace.

4. The method for laying a waste heat furnace wall structure according to claim 1, characterized in that: The thickness of the first ceramic fiber paper (2) is set to 2 mm-6 mm, and the thickness of the second ceramic fiber paper is set to 2 mm-6 mm.

5. The method for laying a waste heat furnace wall structure according to claim 2, characterized in that: The thickness of the first ceramic fiber paper (2) and the second ceramic fiber paper (4) are both set to 3 mm.

6. The method for laying a waste heat furnace wall structure according to claim 3, characterized in that: The thickness of the first light-weight brick (3) is set to 50 mm-120 mm, and the density is 0.5 g / cm 3 -1g / cm 3 The thickness of the second light-weight brick (5) is set to 50 mm-120 mm, and the density is 0.5 g / cm 3 -1g / cm 3 .

7. The method for laying a waste heat furnace wall structure according to claim 4, characterized in that: The thickness of the first light-weight brick (3) is 65 mm and the density is 0.8 g / cm 3 The thickness of the second light-weight brick (5) is 114 mm and the density is 0.8 g / cm 3 .

8. The method for laying a waste heat furnace wall structure according to claim 5, characterized in that: The upper and lower spacing of the heat-resistant plate nails (7) is set to 180mm-240mm, and the left and right spacing is set to 210mm-260mm.

9. The method for laying a waste heat furnace wall structure according to claim 6, characterized in that: The upper and lower spacing of the heat-resistant plate nails (7) is 200 mm, and the left and right spacing is 235 mm.

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