Modular furnace wall structure and construction method thereof

Abstract

The invention relates to the technical field of heating furnaces, and discloses a modular furnace wall structure which comprises a furnace wall body, the furnace wall body sequentially comprises a furnace shell, an anti-corrosion and anti-dew-point coating, a ceramic fiber backing, aluminum-foil paper, a ceramic fiber lining and a nanometer infrared coating from outside to inside, and the ceramic fiber lining comprises a plurality of ceramic fiber module layers and ceramic fiber cushion layers. The ceramic fiber module layers and the ceramic fiber cushion layers are arranged at intervals from bottom to top, each ceramic fiber module layer comprises a plurality of sets of ceramic fiber modules distributed in the circumferential direction, and every two adjacent layers of ceramic fiber modules are arranged in a staggered mode. The size and the weight of equipment can be reduced, construction can be facilitated, and the using effect of the heating furnace is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of heating furnaces, and in particular to a modular furnace wall structure and a construction method thereof. Background Art

[0002] Vertical flue gas generator is a kind of air heating furnace, which is often used to heat materials or perform drying and heat treatment tasks. It belongs to industrial kiln. Among them, the furnace wall is an important part of the vertical flue gas generator, which is mainly used to protect the furnace shell and reduce heat loss. The vertical flue gas generator uses natural gas as fuel. The flue gas is sent to the next process for heating and drying the material after dust removal, desulfurization, drying and other processes. This heating furnace is widely used in petrochemical catalyst production enterprises.

[0003] At present, there are two main types of existing furnace wall structures. One is the early refractory brick and lightweight brick structure (referred to as refractory brick structure), in which the working layer (fire-facing surface) is refractory brick, and the outer layer close to the furnace shell is lightweight insulation brick; the other is the lightweight furnace wall structure (referred to as lightweight spray coating structure) that has appeared in recent years, in which the working layer (fire-facing surface) is refractory fiber spray coating, and the outer layer close to the furnace shell is lightweight refractory spray coating; lightweight refractory spray coating is composed of lightweight refractory aggregate, powder, raw clay, binder and admixture. During construction, these materials are formulated and mixed, and then projected onto the furnace wall by a sprayer. The volume density of the material after drying is 1000kg / m 3 After the lightweight refractory spray coating solidifies, the refractory fiber spray coating can be applied. The refractory fiber spray coating is composed of refractory fiber cotton and a binder. After the refractory fiber cotton and the binder are mixed evenly in a certain proportion, they are applied using spray equipment and projected onto the lightweight refractory spray coating base by the sprayer. After drying, the volume density of the refractory fiber spray coating is between 180 and 200 kg / m 3 .

[0004] There are at least the following problems in the prior art: First, the materials used in the early refractory brick furnace wall scheme have poor thermal insulation performance, high thermal conductivity, large heat loss, and high shell temperature, which affects the working environment of workers and is not energy-saving and environmentally friendly; due to the poor thermal insulation performance, the furnace wall needs to be made very thick, resulting in a large weight of the furnace wall, and the weight of the lining of the entire furnace reaches 130 to 160 tons; and the process layout of large-scale chemical plants is a multi-layer structure, and the load-bearing capacity of the building foundation is limited; and due to the needs of thermal technology, the furnace size is fixed, and the thick furnace wall structure is bound to increase the volume of the heating furnace and occupy more site space; Second, the specific gravity of the lightweight refractory spray coating used in the lightweight furnace wall structure in recent years is still too large, and the furnace wall is thick, resulting in heavy equipment and large furnace volume. The load-bearing capacity and site of the installation floor are limited, and the thermal insulation effect is poor, and the energy saving is poor. In addition, the spray coating is sprayed. During construction, the material is projected onto the base furnace wall at a certain speed and adheres to the wall by impact force and adhesion. The material is prone to sagging or falling off, and the wall is not dense, has low strength, and is not resistant to erosion. The flue gas contains moisture and acidic substances, and the gas passes through the furnace wall. When the temperature is lower than the dew point, acidic liquid will be generated, which will corrode the metal furnace shell and shorten its service life. The thickness of each spraying construction is controlled at about 50mm. When the thickness increases, it is necessary to wait for the new spray material to solidify before carrying out multiple spraying constructions, and the total construction thickness is limited. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention develops a modular furnace wall structure and a construction method thereof. The present invention adopts a modular design, has good fire resistance and heat preservation effects, can reduce the volume and weight of the equipment, and is convenient for construction, thereby effectively improving the use effect of the heating furnace.

[0006] The technical solution to the technical problem solved by the present invention is as follows: on the one hand, an embodiment of the present invention provides a modular furnace wall structure, including a furnace wall body, the furnace wall body including a furnace shell, a ceramic fiber backing and a ceramic fiber lining from the outside to the inside, an anti-corrosion and anti-dew point coating is provided between the furnace shell and the ceramic fiber backing, aluminum foil is provided between the ceramic fiber backing and the ceramic fiber lining, a nano-infrared coating is provided on the side of the ceramic fiber lining away from the ceramic fiber backing, the ceramic fiber lining includes several layers of ceramic fiber module layers and ceramic fiber cushion layers, the ceramic fiber module layers and the ceramic fiber cushion layers are spaced apart from bottom to top, each layer of the ceramic fiber module layer includes several groups of circumferentially distributed ceramic fiber modules, and the ceramic fiber modules of two adjacent layers are staggered.

[0007] As an optimization, the ceramic fiber backing includes several layers of ceramic fiber blankets laid from the outside to the inside, and the ceramic fiber blankets of two adjacent layers are staggered. The diameter of the ceramic fiber is about 3 to 5 μm, and it is arranged in a disordered manner. After compaction, countless small irregular gaps are formed between the fibers, which can increase heat conduction and convection resistance, and have good thermal insulation effects.

[0008] As an optimization, the expansion direction of the ceramic fiber module is the circumferential direction of the furnace. After expansion, the ceramic fiber module can be squeezed with the adjacent ceramic fiber modules on the left and right ends to achieve seamless connection and increase sealing. The height direction of the furnace is the non-expansion direction of the ceramic fiber module, which can avoid inconsistent expansion heights of ceramic fiber modules on the same layer, resulting in dislocation and gaps in the ceramic fiber cushion layer.

[0009] As an optimization, the ceramic fiber module is a ceramic fiber blanket folded and compressed in an "S" shape, which is convenient for prefabrication and can ensure that the expansion direction of the ceramic fiber module is the circumferential direction of the furnace.

[0010] As an optimization, a plurality of groups of anchor bolts for fixing the ceramic fiber module are provided on the inner side of the furnace shell. The ceramic fiber module can be fixed by providing the anchor bolts.

[0011] As an optimization, the thickness of the ceramic fiber backing is 50-80 mm. By setting the thickness of the ceramic fiber backing to 50-80 mm, the distance between the aluminum foil and the furnace shell can be 50-80 mm, and the temperature at the location of the aluminum foil is 100℃-200℃, which is higher than the flue gas dew point, and no acidic liquid will be generated, and the aluminum foil will not be corroded. At this temperature, the aluminum foil is not easily oxidized and damaged, and has a good reflective effect.

[0012] On the other hand, an embodiment of the present invention provides a construction method of a modular furnace wall structure, which is used to construct the modular furnace wall structure, comprising the following steps: S1. Remove rust from the inner surface of the furnace shell and weld anchor bolts; S2. Apply anti-corrosion and anti-dew point coating on the inner surface of the furnace shell; S3, laying ceramic fiber backing, laying several layers of ceramic fiber blankets on the inner side of the furnace shell from the outside to the inside, and staggering the inner and outer adjacent layers of ceramic fiber blankets; S4, laying aluminum foil, laying aluminum foil on the inner side of the ceramic fiber backing; S5, laying a ceramic fiber lining, laying a layer of annular ceramic fiber cushion layer on the bottom of the furnace, and then laying a layer of ceramic fiber module horizontally along the circumferential direction on the ceramic fiber cushion layer to form a ceramic fiber module layer, and compacting the ceramic fiber cushion layer at the bottom, and then laying another layer of annular ceramic fiber cushion layer on the top of the ceramic fiber module layer, so as to alternately lay ceramic fiber module layers and ceramic fiber cushion layers from bottom to top to form a ceramic fiber lining; S6. Spray nano-infrared coating on the inner side of the ceramic fiber lining.

[0013] As an optimization, step S5 includes prefabricating a ceramic fiber module, folding the ceramic fiber blanket in an "S"-shaped path to form a fan-shaped ceramic fiber module, and a preset anchor is provided on the side of the ceramic fiber module facing the furnace shell, and a guide tube is preset in the ceramic fiber module. The ceramic fiber module is compressed from both sides to the middle by two sets of splints, and is fixed by a strapping tape to prevent expansion.

[0014] As an optimization, step S5 also includes laying ceramic fiber modules. When laying the ceramic fiber modules, the anchor bolts are inserted into the guide tubes after passing through the anchors on the ceramic fiber modules. Then, a special tool is used to send the nuts into the guide tubes, and the nuts are connected to the anchor bolts. After tightening, the ceramic fiber backing is compacted by the ceramic fiber modules. After the ceramic fiber modules are fixed, the strapping tape and the splint are removed, and the guide tubes are pulled out to allow the two ends of the ceramic fiber modules to expand along the circumferential direction of the furnace, and to be squeezed and compacted with adjacent ceramic fiber modules. The holes left in the guide tubes are naturally sealed during the expansion of the ceramic fiber modules.

[0015] Compared with the prior art, the present invention has the following beneficial effects: By setting up the furnace shell, ceramic fiber backing and ceramic fiber lining, the weight of the heating furnace can be greatly reduced, the volume of the equipment can be reduced, and the requirements and restrictions on the foundation load and space of the plant can be reduced. In addition, modular construction can simplify and speed up the construction speed. By setting up anti-corrosion and anti-dew point coating, the corrosion of the furnace shell by acidic flue gas or liquid can be blocked. By setting up aluminum foil, the thermal insulation effect can be improved by reflecting thermal radiation, and the interface of different materials in the heat transfer direction can be increased to increase the thermal resistance of thermal conduction. Water vapor can be sealed, and the ceramic fiber backing and ceramic fiber lining can be separated to prevent the formation of acidic liquid after the smoke penetrates and liquefies, which will corrode the furnace shell. By setting up nano-infrared coating, it can be highly efficient. It can convert heat energy into infrared radiation, improve heat exchange in the furnace, increase the temperature, field strength and uniformity in the furnace, make the fuel burn more fully, thereby increasing thermal efficiency, reducing energy consumption and saving energy; it can also cooperate with the furnace shell and aluminum foil to divide the furnace wall into two independent closed annular spaces in the thickness direction of the furnace wall, reduce the convective heat transfer generated by the internal air flow, and thus improve the thermal insulation effect; by arranging ceramic fiber pads and ceramic fiber modules, ceramic fiber linings can be quickly constructed and formed, and the ceramic fiber pads can fill and reduce the gap between the upper and lower layers of ceramic fiber modules, so that the formed ceramic fiber lining has good airtightness, fire resistance and good thermal insulation effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of a modular furnace wall structure in the first embodiment of the present invention.

[0017] Figure 2 Schematic diagram of a modular furnace wall structure in a second embodiment of the present invention.

[0018] Figure 3 Schematic diagram of a modular furnace wall structure in a third embodiment of the present invention.

[0019] Figure 4 This is a flow chart of the construction method of the modular furnace wall structure in the third embodiment of the present invention.

[0020] Figure 5Schematic diagram of the ceramic fiber module during prefabrication in an embodiment of the present invention.

[0021] In the figure: 1. furnace shell; 2. anti-corrosion and anti-dew point coating; 3. ceramic fiber backing; 4. aluminum foil; 5. ceramic fiber lining; 6. nano-infrared coating; 7. ceramic fiber cushion; 8. ceramic fiber module; 9. anchor bolt; 10. guide tube; 11. splint; 12. strapping tape. DETAILED DESCRIPTION

[0022] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0023] Example 1 Figure 1 As an embodiment of the present invention, Figure 1 As shown, a modular furnace wall structure includes a furnace wall body, which includes a furnace shell 1, a ceramic fiber backing 3 and a ceramic fiber lining 5 from the outside to the inside, and the ceramic fiber lining 5 includes a plurality of ceramic fiber module layers and a ceramic fiber cushion layer 7. The ceramic fiber module layers and the ceramic fiber cushion layer 7 are spaced apart from bottom to top, and each ceramic fiber module layer includes a plurality of groups of ceramic fiber modules 8 distributed along the circumference of the furnace, and the ceramic fiber modules 8 of two adjacent layers are staggered.

[0024] By arranging the furnace shell 1, the ceramic fiber backing 3 and the ceramic fiber lining 5, the weight of the heating furnace can be greatly reduced, the volume of the equipment can be reduced, the requirements and restrictions on the foundation load and space of the factory building can be reduced, and the modular construction can simplify and speed up the construction speed; by arranging the ceramic fiber cushion layer 7 and the ceramic fiber module 8, the ceramic fiber lining 5 can be quickly constructed and formed, and the ceramic fiber cushion layer 7 can fill and reduce the gap between the upper and lower layers of the ceramic fiber module layers, so that the formed ceramic fiber lining 5 has good airtightness, fire resistance and thermal insulation effects.

[0025] The ceramic fiber backing 3 includes several layers of ceramic fiber blankets laid sequentially from the outside to the inside, and the ceramic fiber blankets of two adjacent layers are staggered to increase the sealing performance. The diameter of the ceramic fiber is about 3 to 5 μm, and it is arranged in a disordered manner. After compaction, countless small irregular gaps are formed between the fibers, which can increase heat conduction and convection resistance, and have good thermal insulation effect.

[0026] The expansion direction of the ceramic fiber module 8 is the circumferential direction of the furnace. The ceramic fiber module 8 can expand 20% to 30% in the circumferential direction of the furnace. After expansion, it can be squeezed with the adjacent ceramic fiber modules 8 on the left and right ends to achieve seamless connection and increase sealing. The height direction of the furnace is the non-expansion direction of the ceramic fiber module 8, which can avoid inconsistent expansion heights of the ceramic fiber modules 8 on the same layer, resulting in dislocation and gaps in the ceramic fiber mat 7.

[0027] The ceramic fiber module 8 is a ceramic fiber blanket folded and compressed in an "S"-shaped path, which is convenient for prefabrication and can ensure that the expansion direction of the ceramic fiber module 8 is the circumferential direction of the furnace.

[0028] The inner side of the furnace shell 1 is provided with a plurality of groups of anchor bolts 9 for fixing the ceramic fiber module 8. By providing the anchor bolts 9, the ceramic fiber module 8 can be fixed.

[0029] The thickness of the ceramic fiber backing 3 is 50-80 mm, and the thickness of the ceramic fiber lining 5 is 300-330 mm. The overall thickness of the furnace wall is small, which can reduce the requirements and restrictions on the foundation load and space of the plant.

[0030] Example 2 Figure 2 This is the second embodiment of the present invention, which differs from the first embodiment in that a nano-infrared coating 6 is provided on the side of the ceramic fiber lining 5 away from the ceramic fiber backing 3, and the thickness of the nano-infrared coating 6 is 2 to 3 mm. By providing the nano-infrared coating 6, heat energy can be efficiently converted into infrared radiation, the heat exchange in the furnace can be improved, the temperature, field strength and uniformity in the furnace can be increased, and the fuel can be burned more fully, thereby increasing thermal efficiency, reducing energy consumption and saving energy.

[0031] Example 3 Figure 3 This is the third embodiment of the present invention, which is different from the embodiment 2 in that an anti-corrosion and anti-dew point coating 2 is provided between the furnace shell 1 and the ceramic fiber backing 3, and an aluminum foil 4 is provided between the ceramic fiber backing 3 and the ceramic fiber lining 5. By providing the anti-corrosion and anti-dew point coating 2, it is possible to prevent acidic flue gas or liquid from corroding the furnace shell 1; by providing the aluminum foil 4, the thermal insulation effect can be improved by reflecting thermal radiation, and the interface of different materials in the heat transfer direction can be increased to increase the thermal resistance of heat conduction; water vapor can be sealed, and the ceramic fiber backing 3 and the ceramic fiber lining 5 can be separated to prevent the formation of acidic liquid after the flue gas penetrates and liquefies, thereby corroding the furnace shell 1; and the furnace shell 1 and the nano-infrared coating 6 can also be used to divide the furnace wall into two independent closed annular spaces in the thickness direction of the furnace wall to reduce the convective heat transfer generated by the internal air flow, thereby improving the thermal insulation effect.

[0032] The thickness of the aluminum foil 4 is 0.15 mm. The distance between the aluminum foil 4 and the furnace shell 1 is 50-80 mm, which can make the temperature of the location of the aluminum foil 4 100°C-200°C, which is higher than the flue gas dew point, and will not generate acidic liquid, the aluminum foil 4 will not be corroded, and the aluminum foil 4 is not easy to be oxidized and damaged at this temperature, and has a good reflection effect.

[0033] Table 1 shows the furnace wall thickness and furnace wall weight. Since the anti-corrosion and anti-dew point coating 2, aluminum foil 4 and nano-infrared coating 6 are relatively thin, they are ignored when calculating the furnace wall thickness. The specific data are shown in Table 1: Table 1 Furnace wall thickness and furnace wall weight

[0034] It can be seen from Table 1 that in the actual production process, the furnace wall thicknesses of Comparative Example 2, Example 1, Example 2 and Example 3 are much lower than the furnace wall thickness of Comparative Example 1, and occupy less space; under the condition of the same furnace wall thickness, the furnace wall weights of Example 1, Example 2 and Example 3 are much lower than the furnace wall weight of Comparative Example 1, and much lower than the furnace wall weight of Comparative Example 2, which can greatly reduce the requirements and restrictions on the foundation load of the plant.

[0035] Table 2 is a table of thermal parameters of the furnace wall under the conditions of furnace temperature of 700℃ and ambient temperature of 20℃. The shell temperature is the measured average temperature within the range of 3 to 8m above the furnace bottom. The heat flux density and total heat dissipation are calculated values. The specific data are shown in Table 2: Table 2 Furnace wall thermal parameters

[0036] It can be seen from Table 2 that the shell temperature, heat flux density, total heat dissipation and heat dissipation relative ratio of Example 1, Example 2 and Example 3 are much lower than those of Comparative Example 1 and Comparative Example 2, and the fire resistance and thermal insulation effects are significantly enhanced, among which the use effect of Example 3 is particularly obvious.

[0037] Table 3 is the natural gas consumption table, where the burner rated power is 9000KW and the maximum natural gas flow rate is 1000m 3 / h, the natural gas flow rate is the measured average value when the furnace temperature is 700℃, and the specific data are shown in Table 3: Table 3 Natural gas consumption

[0038] It can be seen from Table 3 that the energy-saving effects of Example 1, Example 2 and Example 3 are better than those of Comparative Example 2, among which the gas consumption reduction of Example 3 is greater than 5%, and the environmental protection and energy-saving effect is better.

[0039] Figure 4 A construction method of a modular furnace wall structure of the present invention is used to construct the modular furnace wall structure, comprising the following steps: S1, rust removal on the inner surface of the furnace shell 1, and welding of anchor bolts 9; S2, applying an anti-corrosion and anti-dew point coating 2 on the inner surface of the furnace shell 1; S3, laying the ceramic fiber backing 3, laying several layers of ceramic fiber blankets on the inner side of the furnace shell 1 from the outside to the inside, and staggering the inner and outer adjacent layers of ceramic fiber blankets to ensure that the lap joints of the inner and outer adjacent layers of ceramic fiber blankets are staggered to improve the airtightness; S4, laying aluminum foil 4, laying aluminum foil 4 on the inner side of the ceramic fiber backing 3; S5, laying a ceramic fiber lining 5, laying a layer of annular ceramic fiber cushion layer 7 on the bottom of the furnace, and then laying a layer of ceramic fiber module 8 horizontally along the circumferential direction on the ceramic fiber cushion layer 7 to form a ceramic fiber module layer, and compacting the ceramic fiber cushion layer 7 at the bottom, and then laying another layer of annular ceramic fiber cushion layer 7 on the top of the ceramic fiber module layer, so that the ceramic fiber module layer and the ceramic fiber cushion layer 7 are alternately laid from bottom to top to form a ceramic fiber lining 5; S6. Spraying the nano-infrared coating 6 on the inner side of the ceramic fiber lining 5.

[0040] In step S5, a prefabricated ceramic fiber module 8 is also included, such as Figure 5 As shown, the ceramic fiber blanket is folded in an "S"-shaped path to form a fan-shaped ceramic fiber module 8, and an anchor (not shown in the figure) is preset on the side of the ceramic fiber module 8 facing the furnace shell 1, and a guide tube 10 is preset in the ceramic fiber module 8. The length of the guide tube 10 is equal to the thickness of the ceramic fiber module 8, and then the ceramic fiber module 8 is compressed from both sides to the middle by two groups of clamping plates 11. It should be noted that the ceramic fiber module 8 should be compressed into a trapezoidal or oblique trapezoidal shape according to the shape of the furnace wall, and fixed by a strapping belt 12 to prevent expansion.

[0041] In step S5, it also includes laying the ceramic fiber module 8. When laying the ceramic fiber module 8, the anchor bolt 9 passes through the anchor on the ceramic fiber module 8 and is inserted into the guide tube 10. Then, a special tool is used to send the nut into the guide tube 10, and the nut is connected to the anchor bolt 9. After tightening the nut, the ceramic fiber backing 3 is compacted by the ceramic fiber module 8, which can improve the fire resistance and thermal insulation effects. After the ceramic fiber module 8 is fixed, the strapping belt 12 and the splint 11 are removed, and the guide tube 10 is pulled out, so that the two ends of the ceramic fiber module 8 expand along the circumferential direction of the furnace, and are squeezed and compacted with the adjacent ceramic fiber modules 8. The holes left in the guide tube 10 are naturally sealed during the expansion of the ceramic fiber module 8.

[0042] The present invention adopts a modular design and improves the fire resistance and heat preservation effects in a variety of ways, which can not only reduce the volume and weight of the equipment, but also facilitate construction, and effectively improve the use effect of the heating furnace.

[0043] The descriptions of the orientation or relative position relationship of the structure in the present invention, such as the orientation or relative position relationship indicated by "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

Claims

1. A modular furnace wall structure, comprising a furnace wall body, the furnace wall body comprising, from outside to inside, a furnace shell (1), a ceramic fiber backing (3) and a ceramic fiber lining (5), characterized in that: An anti-corrosion and anti-dew point coating (2) is provided between the furnace shell (1) and the ceramic fiber backing (3), an aluminum foil (4) is provided between the ceramic fiber backing (3) and the ceramic fiber lining (5), a nano-infrared coating (6) is provided on the side of the ceramic fiber lining (5) away from the ceramic fiber backing (3), and the ceramic fiber lining (5) includes a plurality of ceramic fiber module layers and a ceramic fiber cushion layer (7), the ceramic fiber module layers and the ceramic fiber cushion layer (7) are arranged in a spaced manner from bottom to top, each ceramic fiber module layer includes a plurality of groups of circumferentially distributed ceramic fiber modules (8), and the ceramic fiber modules (8) of two adjacent layers are arranged in a staggered manner.

2. The modular furnace wall structure according to claim 1 is characterized in that: The ceramic fiber backing (3) comprises a plurality of layers of ceramic fiber blankets which are laid sequentially from the outside to the inside, and the ceramic fiber blankets of two adjacent inner and outer layers are arranged in a staggered manner.

3. The modular furnace wall structure according to claim 1 is characterized in that: The expansion direction of the ceramic fiber module (8) is the circumferential direction of the furnace.

4. The modular furnace wall structure according to claim 3 is characterized in that: The ceramic fiber module (8) is a ceramic fiber blanket that is folded and compressed in an "S"-shaped path.

5. The modular furnace wall structure according to claim 4 is characterized in that: A plurality of groups of anchor bolts (9) for fixing the ceramic fiber modules (8) are provided on the inner side of the furnace shell (1).

6. The modular furnace wall structure according to claim 5, characterized in that: The thickness of the ceramic fiber backing (3) is 50 to 80 mm.

7. A method for constructing a modular furnace wall structure, used for constructing the modular furnace wall structure according to claim 6, characterized in that: The following steps are involved: S1. Derust the inner surface of the furnace shell (1) and weld the anchor bolts (9); S2. Applying an anti-corrosion and anti-dew point coating (2) on the inner surface of the furnace shell (1); S3, laying a ceramic fiber backing (3), laying a plurality of layers of ceramic fiber blankets in sequence from the outside to the inside of the furnace shell (1), with two adjacent layers of ceramic fiber blankets being staggered; S4, laying aluminum foil (4), laying aluminum foil (4) on the inner side of the ceramic fiber backing (3); S5, laying a ceramic fiber lining (5), laying a layer of annular ceramic fiber cushion layer (7) on the bottom of the furnace, and then laying a layer of ceramic fiber module (8) horizontally along the circumferential direction on the ceramic fiber cushion layer (7) to form a ceramic fiber module layer, and compacting the ceramic fiber cushion layer (7) at the bottom, and then laying another layer of annular ceramic fiber cushion layer (7) on the top of the ceramic fiber module layer, so that the ceramic fiber module layer and the ceramic fiber cushion layer (7) are alternately laid from bottom to top to form a ceramic fiber lining (5); S6. Spraying a nano-infrared coating (6) on the inner side of the ceramic fiber lining (5).

8. The construction method of the modular furnace wall structure according to claim 7 is characterized in that: Step S5 comprises prefabricating a ceramic fiber module (8), folding a ceramic fiber blanket in an "S"-shaped path to form a fan-shaped ceramic fiber module (8), wherein an anchor is preset on one side of the ceramic fiber module (8) facing the furnace shell (1), a guide tube is preset in the ceramic fiber module (8), the ceramic fiber module (8) is compressed from both sides toward the middle by two sets of clamping plates, and is fixed by a binding belt to prevent expansion.

9. The construction method of the modular furnace wall structure according to claim 7, characterized in that: Step S5 also includes laying the ceramic fiber module (8). When laying the ceramic fiber module (8), the anchor bolt (9) passes through the anchor piece on the ceramic fiber module (8) and is inserted into the guide tube. Then, a special tool is used to insert the nut into the guide tube, and the nut is connected to the anchor bolt (9). After tightening, the ceramic fiber backing (3) is compacted by the ceramic fiber module (8). After the ceramic fiber module (8) is laid, the binding belt and the splint are removed, and the guide tube is pulled out, so that the two ends of the ceramic fiber module (8) expand along the circumferential direction of the furnace and are squeezed and compacted with the adjacent ceramic fiber modules (8). The hole left in the guide tube is naturally sealed during the expansion process of the ceramic fiber module (8).

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