A method for insulating a smelting furnace

Abstract

This invention discloses a method for heat insulation of smelting furnaces and kilns. It includes: an inner wall heat insulation coating: the inner wall of the smelting furnace or kiln is sandblasted, then sequentially sprayed with an inner wall metal transition layer, an inner wall heat insulation layer, and an inner wall microwave-absorbing temperature control layer; the inner wall heat insulation layer is formed by spraying a heat insulation coating through 15-20 coats, the components of which include ceramic hollow microspheres, inorganic silicate solution, inorganic fibers, and heat-reflective auxiliary fillers; the inner wall microwave-absorbing temperature control layer is formed by spraying a microwave-absorbing temperature control coating through 1-3 coats, capable of absorbing electromagnetic waves in the infrared band; and an outer wall heat insulation coating: the outer wall of the smelting furnace or kiln is polished, then sequentially sprayed with an outer wall metal transition layer, an outer wall heat insulation layer, and an outer wall waterproof layer; the outer wall heat insulation layer is formed by spraying a heat insulation coating through 1-3 coats. This invention's heat insulation method can significantly reduce the outer wall temperature, reduce fuel consumption, and has achieved tangible and significant energy-saving benefits in actual operation.

Description

Technical Field

[0001] This invention relates to the field of coating technology for smelting furnaces and kilns, and specifically to a heat insulation method for smelting furnaces and kilns. Background Technology

[0002] Existing kilns are typically located after the flash furnace smelting process and before the continuous casting process. Because the operating temperature of the anode furnace is extremely high, reaching as high as 1450℃ internally, traditional insulation materials have limited effectiveness, and the outer wall temperature can still reach 180~350℃, resulting in a large amount of heat loss. For example, a copper smelter with an annual output of 100,000 tons will lose the equivalent of 2,000 tons of standard coal in heat each year as a result.

[0003] In summary, the existing kiln insulation system is inefficient, has a high outer wall temperature, suffers significant heat loss, and has a high heavy oil consumption per unit, resulting in energy waste and increased production costs. Summary of the Invention

[0004] In order to solve the problems existing in the background art, the present invention provides a heat insulation method for smelting furnaces and kilns.

[0005] The technical solution adopted in this invention is: The heat insulation method for smelting furnaces and kilns provided by this invention includes: I. A construction method for a heat insulation coating on the inner wall of a smelting furnace: the inner wall of the smelting furnace is sandblasted, and then the inner wall metal transition layer, the inner wall heat insulation layer and the inner wall wave-absorbing temperature control layer are sprayed in sequence. The inner wall heat insulation layer is mainly formed by spraying heat insulation coating 15 to 20 times. The components of the heat insulation coating include ceramic hollow microspheres with a particle size range of 400 mesh to 800 mesh, inorganic silicate solution, inorganic fibers and heat reflective auxiliary filler. The inner wall absorbing temperature control layer is mainly formed by spraying absorbing temperature control coating 1 to 3 times. The inner wall absorbing temperature control layer is used to absorb electromagnetic waves of infrared short waves ≤3μm.

[0006] II. A construction method for a heat insulation coating on the outer wall of a smelting furnace: The outer wall of the smelting furnace is ground, and then the outer wall metal transition layer, the outer wall heat insulation layer and the outer wall waterproof layer are sprayed in sequence. The outer wall thermal insulation layer is mainly formed by spraying thermal insulation coating 1 to 3 times.

[0007] Preferably, the microwave-absorbing temperature-controlled coating comprises the following components in parts by weight: 28-32 parts of lithium potassium silicate composite solution; 10-15 parts of water-based urea-formaldehyde resin; 15-17 parts of zirconium corundum micro powder; 13-17 parts of yttrium oxide micro powder; 8-12 parts of cerium dioxide micro powder; 6-10 parts of dysprosium trioxide micro powder; Europium trioxide micro powder, 1-5 parts; 1-5 parts basalt fiber; 1-3 parts of aqueous dispersant; 0.8 to 1.2 parts of coupling agent.

[0008] Preferably, in the heat-insulating coating, the ceramic hollow microspheres are zirconium corundum hollow microspheres, the inorganic silicate solution is a lithium potassium silicate composite solution, the inorganic fiber is basalt fiber, and the heat-reflective auxiliary filler is flake mica powder.

[0009] Preferably, the thermal insulation coating comprises the following components in parts by weight: 16-20 parts of lithium potassium silicate composite solution; 8-10 parts of water-based urea-formaldehyde resin; 40-48 parts of zirconium corundum hollow microspheres; 15-20 parts of basalt fiber; 1-5 parts of potassium-based bentonite; 1-5 parts of flake mica powder; Preservative: 0.8-1.2 parts; Stabilizer 0.8~1.2 parts; 0.8~1.2 parts of aqueous dispersant; 1-3 parts coupling agent; Carboxymethyl cellulose 0.3~0.7 parts; pH adjuster 0.3~0.7 parts.

[0010] Preferably, the outer waterproof layer is mainly formed by a single spraying of a ceramic waterproof coating; the ceramic waterproof coating comprises the following components in parts by weight: 23-27 parts of lithium potassium silicate composite solution; 5-10 parts of water-based urea-formaldehyde resin; 3-5 parts of carbamate; 3-5 parts of isoamyl alcohol; 15-20 parts of silica micro powder; 15-20 parts of aluminum oxide micro powder; 8-10 parts of zirconium diboride micro powder; 4-6 parts of silicon nitride micro powder; 1-3 parts of molybdenum boride micro powder; 3-7 parts basalt fiber; 1-3 parts of aqueous dispersant; 0.8 to 1.2 parts of coupling agent.

[0011] Preferably, both the inner and outer metal transition layers are formed primarily by a single spraying of a metal transition coating.

[0012] Preferably, the metallic transition coating comprises the following components in parts by weight: 55-65 parts of lithium potassium silicate composite solution; 18-22 parts of waterborne urea-formaldehyde resin; 8-12 parts of polyacrylol; 3-7 parts basalt fiber; 3-7 parts of zirconium dioxide micro powder.

[0013] Preferably, the thickness ranges of the inner wall metal transition layer, the inner wall heat insulation layer, and the inner wall microwave absorbing temperature control layer are 0.2~0.5mm, 15~20mm, and 0.7~0.9mm, respectively.

[0014] Preferably, the thicknesses of the outer wall metal transition layer, the outer wall heat insulation layer, and the outer wall waterproof layer are 0.2~0.5mm, 3~5mm, and 0.7~0.9mm, respectively.

[0015] Preferably, the total thickness of the inner wall thermal insulation layer and the outer wall thermal insulation layer is 18~25mm.

[0016] The beneficial effects of this invention are: The thermal insulation method of this invention can significantly reduce the temperature of the outer wall, reduce fuel consumption, and has achieved definite and significant energy-saving benefits in actual operation. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to specific embodiments.

[0018] This invention provides a method for heat insulation of smelting furnaces and kilns.

[0019] The method of the present invention includes: A construction method for a heat insulation coating on the inner wall of a smelting furnace: the inner wall of the smelting furnace is sandblasted, and then an inner wall metal transition layer, an inner wall heat insulation layer, and an inner wall wave-absorbing temperature control layer are sprayed in sequence. The inner wall thermal insulation layer is mainly formed by spraying thermal insulation coating 15 to 20 times. The components of the thermal insulation coating include ceramic hollow microspheres with a particle size range of 400 mesh to 800 mesh, inorganic silicate solution, inorganic fibers and heat-reflective auxiliary fillers. The inner wall absorbing temperature control layer is mainly formed by spraying absorbing temperature control coating 1 to 3 times. The inner wall absorbing temperature control layer is used to absorb electromagnetic waves in the infrared band ≤3μm. A construction method for a heat insulation coating on the outer wall of a smelting furnace: the outer wall of the smelting furnace is ground, and then the outer wall metal transition layer, the outer wall heat insulation layer and the outer wall waterproof layer are sprayed in sequence. The external wall thermal insulation layer is mainly formed by spraying thermal insulation coating 1 to 3 times.

[0020] Specifically, the microwave absorbing temperature control coating comprises the following components in parts by weight: 28-32 parts of lithium potassium silicate composite solution, preferably 30 parts; 10-15 parts of waterborne urea-formaldehyde resin, preferably 12 parts; 15-17 parts of zirconium corundum micro powder, preferably 16 parts; 13-17 parts of yttrium oxide micro powder, preferably 15 parts; 8-12 parts of cerium dioxide micro powder, preferably 10 parts; 6-10 parts of dysprosium trioxide micro powder, preferably 8 parts; Europium trioxide micro powder, 1-5 parts, preferably 3 parts; Basalt fiber 1-5 parts, preferably 3 parts; 1-3 parts of aqueous dispersant, preferably 2 parts; The coupling agent is 0.8 to 1.2 parts, preferably 1 part.

[0021] After the above-mentioned microwave-absorbing temperature control coating is formed, it can withstand a high temperature of 1300℃ and absorb electromagnetic waves in the infrared band of ≤3μm.

[0022] Specifically, in the thermal insulation coating, the ceramic hollow microspheres are zirconium corundum hollow microspheres, the inorganic silicate solution is a lithium potassium silicate composite solution, the inorganic fiber is basalt fiber, and the heat-reflective auxiliary filler is flake mica powder. In this coating, the air inside the zirconium corundum hollow microspheres does not generate heat convection after being heated to high temperatures. The tightly packed zirconium corundum hollow microspheres also have three-dimensional air layers between them, further preventing heat convection. The inorganic silicate solution, as a film-forming substance, together with the static air layers, forms a thermal insulation shielding layer. The addition of the heat-reflective auxiliary filler further improves the thermal conductivity of the coating, making it closer to the vacuum thermal conductivity, thus enabling the formed thermal insulation coating to withstand high temperatures and achieve effective thermal insulation.

[0023] Specifically, the thermal insulation coating comprises the following components in parts by weight: 16-20 parts of potassium lithium silicate composite solution, preferably 18 parts; 8-10 parts of waterborne urea-formaldehyde resin, preferably 9 parts; 40-48 parts of zirconium corundum hollow microspheres, preferably 44 parts; Basalt fiber 15-20 parts, preferably 17 parts; 1 to 5 parts of potassium-based bentonite, preferably 3 parts; 1-5 parts of flake mica powder, preferably 3 parts; Preservative: 0.8-1.2 parts, preferably 1 part; Stabilizer 0.8~1.2 parts, preferably 1 part; 0.8 to 1.2 parts of aqueous dispersant, preferably 1 part; 1-3 parts of coupling agent, preferably 2 parts; Carboxymethyl cellulose: 0.3-0.7 parts, preferably 0.5 parts; pH adjuster: 0.3-0.7 parts, preferably 0.5 parts.

[0024] After the above-mentioned heat insulation coating is formed, it does not change under long-term use at 1000℃; the thermal conductivity of the coating is extremely low, reaching 0.03W / mk.

[0025] Specifically, the external waterproof layer is mainly formed by a single spraying of ceramic waterproof coating; the ceramic waterproof coating comprises the following components in parts by weight: 23-27 parts of lithium potassium silicate composite solution, preferably 25 parts; 5-10 parts of waterborne urea-formaldehyde resin, preferably 7 parts; 3-5 parts of carbamate, preferably 4 parts; 3-5 parts of isoamyl alcohol, preferably 4 parts; 15-20 parts of silica micro powder, preferably 18 parts; 15-20 parts of aluminum oxide micro powder, preferably 18 parts; 8-10 parts of zirconium diboride micro powder, preferably 9 parts; 4-6 parts of silicon nitride micro powder, preferably 5 parts; 1-3 parts of molybdenum boride micro powder, preferably 2 parts; Basalt fiber 3-7 parts, preferably 5 parts; 1-3 parts of aqueous dispersant, preferably 2 parts; The coupling agent is 0.8 to 1.2 parts, preferably 1 part.

[0026] Specifically, both the inner and outer metal transition layers are formed primarily by a single spraying of metal transition coatings. Both layers are used to improve interlayer adhesion. In other words, after the metal transition coating cures, it forms a continuous film on the metal surface, effectively increasing the adhesion between the metal substrate and the coating, and extending the overall service life of the coating system.

[0027] Specifically, the metallic transition coating comprises the following components in parts by weight: 55-65 parts of lithium potassium silicate composite solution, preferably 60 parts; 18-22 parts of waterborne urea-formaldehyde resin, preferably 20 parts; 8-12 parts of polyacryl alcohol, preferably 10 parts; Basalt fiber 3-7 parts, preferably 5 parts; 3-7 parts of zirconium dioxide micro powder, preferably 5 parts.

[0028] Preferably, the thicknesses of the inner wall metal transition layer, the inner wall heat insulation layer, and the inner wall microwave absorbing temperature control layer are 0.2~0.5mm, 15~20mm, and 0.7~0.9mm, respectively.

[0029] Preferably, the thicknesses of the outer wall metal transition layer, the outer wall heat insulation layer, and the outer wall waterproof layer are 0.2~0.5mm, 3~5mm, and 0.7~0.9mm, respectively.

[0030] In practice, for heat insulation coatings and microwave absorbing temperature control coatings, after each spraying, it is necessary to wait at least 3 to 5 hours until the base layer is dry before the next spraying.

[0031] Specifically, the total thickness of the inner wall insulation layer and the outer wall insulation layer is 18~25mm.

[0032] Specific embodiments of the present invention are as follows: Example 1 This embodiment describes the construction of a heat insulation layer for a rotary anode furnace used for crude refining in a certain area of ​​Jiangxi Province.

[0033] The details of this rotary anode furnace are as follows: The kiln is located after the flash furnace roughing process and before the continuous casting process. The kiln uses oxygen blowing for refining and impurity removal, with a processing capacity of 350 tons per unit. The blowing temperature is controlled at 1100~1250 degrees Celsius, and the outer wall temperature is 180~350 degrees Celsius. The furnace cylinder dimensions are φ4570×10700mm. The inner lining of the straight section of the furnace body, from the inside out, consists of: a 380mm thick magnesia-chrome brick working layer, a 65mm thick clay brick insulation layer, and a 10mm thick asbestos board. The inner lining of the furnace end walls, from the inside out, consists of: a 500mm thick magnesia-chrome brick working layer and a 10mm thick asbestos board. The outer shell of the furnace is made of 40mm boiler steel plate.

[0034] It is evident that due to the extremely high operating temperature of the anode furnace, with an internal temperature reaching 1450℃, traditional insulation materials have limited effectiveness, and the outer wall temperature can still reach 180~350℃, resulting in a significant heat loss. Every year, a copper smelter with an annual output of 100,000 tons will lose the equivalent of 2,000 tons of standard coal in heat. The original heat insulation system of the kiln is inefficient, with a high outer wall temperature and severe heat loss, resulting in high heavy oil consumption, energy waste, and increased production costs.

[0035] In this embodiment, the heat insulation layer of the rotary anode furnace was constructed according to the following construction process: Construction of thermal insulation coating on the inner wall of smelting furnace: Sandblasting treatment of the inner wall of the cylinder → spraying of metal transition coating once → spraying of thermal insulation coating 18 times → spraying of microwave absorbing temperature control coating twice.

[0036] Construction of thermal insulation coating on the outer wall of smelting furnace: grinding the outer surface of the cylinder → spraying the metal transition coating once → spraying the thermal insulation coating three times → spraying the ceramic waterproof material once.

[0037] After construction, a heat insulation coating with a total thickness of 20mm was applied to both the inner and outer walls of the furnace, and the thermal conductivity of the coating was 0.04W / mK.

[0038] The components of the coatings used in this embodiment are as follows: Table 1 Thermal Insulation Coatings Table 2 Metal Transition Coatings Table 3. Wave-absorbing and temperature-controlling coatings Table 4 Ceramic Waterproof Coatings The theoretical temperature, theoretical heat loss, and energy saving rate of the furnace outer wall are calculated based on the thickness and thermal conductivity of the heat insulation coating. 1. Theoretical temperature of the outer wall of the furnace First, ignoring locations such as the feed inlet, discharge outlet, sampling port, and flue gas outlet where heat insulation coating cannot be installed due to structural or process requirements, assume that the furnace body is a closed shell completely and uniformly covered by the coating, and use the average temperature of the furnace outer wall before the modification as the temperature before the modification.

[0039] If the furnace wall temperature before the modification was 255℃ and the ambient temperature outside the furnace was 30℃, the theoretical temperature of the furnace outer wall is approximately 62.785℃. The calculation process is as follows: T1=(λT2+11.63T0d) / (11.63d+λ) =(0.04×255+11.63×30×0.02) / (11.63×0.02+0.04) =17.178 / 0.2736 =62.785 In the formula, T1 represents the theoretical temperature of the outer wall of the furnace after construction, T2 represents the temperature of the outer wall of the furnace before construction, T0 represents the ambient temperature outside the furnace; d represents the total coating thickness of the thermal insulation coating, and λ represents the thermal conductivity of the thermal insulation coating.

[0040] 2. Theoretical temperature of the outer wall of the furnace body Based on the furnace cylinder dimensions of φ4570×10700mm, the calculated outer surface area of ​​the furnace is approximately 186.33m². 2 (Calculation data includes the furnace door). By applying a 20mm thick heat-insulating coating to both the inner and outer walls of the furnace, the temperature of the outer wall can be reduced to 62.785℃, resulting in a temperature reduction of approximately 192.22℃. According to the formula for calculating heat loss from the outer wall of a heating furnace, the heat loss per hour from the outer wall was approximately 1.755 × 10⁶ KJ before the modification. After this modification, the heat loss per hour is approximately 0.255 × 10⁶ KJ, a reduction of approximately 1.5 × 10⁶ KJ. The calculation process is as follows: Q 前 =11.63×(T2-T0)×S×T h =11.63×225×186.33×3600 =1.755×10⁶ kJ Q 后 =11.63×(T1-T0)×S×T h =11.63×32.785×186.33×3600 =0.255×10⁶ kJ △Q=11.63×ΔT×S×T h =11.63×192.22×186.33×3600 =1.5×10⁶ kJ In the formula, Q 前 Q represents the heat loss per hour before construction. 后 The following values ​​represent heat loss per hour after construction: ΔQ represents the theoretical reduction in heat loss per hour after construction; T1 represents the theoretical temperature of the furnace outer wall after construction; T2 represents the temperature of the furnace outer wall before construction; T0 represents the ambient temperature outside the furnace; ΔT represents the decrease in the furnace outer wall temperature; S represents the outer surface area of ​​the furnace body; T h Indicates a time period.

[0041] 3. Heat loss reduction rate and energy saving rate Ignoring heat loss from other parts of the furnace body, and considering only the heat loss from the outer wall of the furnace body, the heat loss of this rotary anode furnace is reduced by approximately 85.47% after this renovation. Assuming that the original furnace efficiency was 90% and 80%, the furnace efficiency after the renovation can be increased to 98.55% and 97.09%, respectively, with energy savings of 9.50% and 21.36%, respectively.

[0042] In this embodiment, the calculation process for the heat loss reduction rate and energy saving rate is as follows: Heat loss reduction rate: (1.5×10) 6 (kJ) / (1.755×10 6 KJ) = 85.47% Furnace efficiency improvement rate under the first operating condition: η2' = 90% + 85.47% × 10% = 98.55% The furnace efficiency improvement rate under the second operating condition is: η2'' = 80% + 85.47% × 20% = 97.09% Energy saving rate under the first operating condition: ξ'=(η2-η1)÷η1=(98.55-90%)÷90%=9.50% The energy saving rate under the second operating condition ξ'' = (η2 - η1) ÷ η1 = (97.09 - 80%) ÷ 80% = 21.36% 4. Resource conservation rate and emission reduction After this renovation, the furnace body's heat loss is reduced by approximately 1.5 × 10⁶ KJ per hour, which is equivalent to saving 416.67 kWh of electricity per hour.

[0043] Based on the 416.67 kWh of electricity saved per hour after the furnace body energy-saving coating renovation, the equivalent standard coal consumption and the reduction in various emissions can be calculated as shown in the table below: Finally, under actual operating conditions, infrared thermography was performed on the outer wall of the anode furnace. The temperature at the measuring point decreased from 300℃ under the same operating conditions before the modification to 220℃. Furthermore, data collected on-site showed that the increased furnace temperature resulted in a 7% reduction in the consumption of natural gas and heavy oil.

[0044] It is evident that the external wall temperature and fuel consumption were significantly reduced after the modification, and the heat insulation method provided by this invention has achieved definite and significant energy-saving benefits in actual operation.

[0045] Example 2 In this embodiment, a sample block in the shape of a regular square prism was prepared using a 6mm thick steel plate as the substrate. The heat-insulating coating with high temperature resistance from Example 1 was used to spray heat-insulating layers with thicknesses of 22.5mm and 23.5mm on the substrate, respectively, resulting in compression test samples with total thicknesses of 29.5mm and 28.5mm before testing.

[0046] In Example 1, the inner diameter of the anode furnace is 4.57 m, and the depth of the molten copper inside the anode furnace is generally about half of the inner diameter. Therefore, the maximum pressure that the inner wall insulation coating can withstand is approximately 0.2 MPa. In the following tests, a compressive load of 0.5 MPa was used. In a constant temperature and humidity environment of 23±2℃ and 50±5%, the compression test specimens were subjected to a compressive load for 2400 h using equipment such as a hydraulic testing machine and an electronic universal testing machine. After removing the load, the thicknesses of the two compression test specimens were measured to be 29 mm and 28.5 mm, respectively, with a compression amount of 0.5 mm and compression rates of 2.13% and 2.22%, respectively.

[0047] The above specific embodiments are used to explain and illustrate the present invention, but not to limit the present invention. Any modifications and changes made to the present invention within the spirit and scope of the claims shall fall within the protection scope of the present invention.

[0048] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A method for heat insulation and preservation of smelting furnaces and kilns, characterized in that, include: A construction method for a heat insulation coating on the inner wall of a smelting furnace: the inner wall of the smelting furnace is sandblasted, and then an inner wall metal transition layer, an inner wall heat insulation layer, and an inner wall wave-absorbing temperature control layer are sprayed in sequence. The inner wall heat insulation layer is mainly formed by spraying heat insulation coating 15 to 20 times. The components of the heat insulation coating include ceramic hollow microspheres with a particle size range of 400 mesh to 800 mesh, inorganic silicate solution, inorganic fibers and heat reflective auxiliary filler. The inner wall absorbing temperature control layer is mainly formed by spraying absorbing temperature control coating 1 to 3 times. The inner wall absorbing temperature control layer is used to absorb electromagnetic waves of infrared short waves ≤3μm. A construction method for a heat insulation coating on the outer wall of a smelting furnace: the outer wall of the smelting furnace is ground, and then the outer wall metal transition layer, the outer wall heat insulation layer and the outer wall waterproof layer are sprayed in sequence. The outer wall thermal insulation layer is mainly formed by spraying thermal insulation coating 1 to 3 times; The microwave-absorbing temperature control coating comprises the following components in parts by weight: 28-32 parts of lithium potassium silicate composite solution; 10-15 parts of water-based urea-formaldehyde resin; 15-17 parts of zirconium corundum micro powder; 13-17 parts of yttrium oxide micro powder; 8-12 parts of cerium dioxide micro powder; 6-10 parts of dysprosium trioxide micro powder; Europium trioxide micro powder, 1-5 parts; 1-5 parts basalt fiber; 1-3 parts of aqueous dispersant; 0.8 to 1.2 parts of coupling agent.

2. The heat insulation method according to claim 1, characterized in that: In the heat insulation coating, the ceramic hollow microspheres are zirconium corundum hollow microspheres, the inorganic silicate solution is lithium potassium silicate composite solution, the inorganic fiber is basalt fiber, and the heat-reflective auxiliary filler is flake mica powder.

3. The heat insulation method according to claim 2, characterized in that: The thermal insulation coating comprises the following components in parts by weight: 16-20 parts of lithium potassium silicate composite solution; 8-10 parts of water-based urea-formaldehyde resin; 40-48 parts of zirconium corundum hollow microspheres; 15-20 parts basalt fiber; 1-5 parts of potassium-based bentonite; 1-5 parts of flake mica powder; Preservative: 0.8-1.2 parts; Stabilizer 0.8~1.2 parts; 0.8~1.2 parts of aqueous dispersant; 1-3 parts coupling agent; Carboxymethyl cellulose 0.3~0.7 parts; pH adjuster 0.3~0.7 parts.

4. The heat insulation method according to claim 1, characterized in that: The outer waterproof layer is mainly formed by a single spraying of a ceramic waterproof coating; the ceramic waterproof coating comprises the following components in parts by weight: 23-27 parts of lithium potassium silicate composite solution; 5-10 parts of water-based urea-formaldehyde resin; 3-5 parts of carbamate; 3-5 parts of isoamyl alcohol; 15-20 parts of silica micro powder; 15-20 parts of aluminum oxide micro powder; 8-10 parts of zirconium diboride micro powder; 4-6 parts of silicon nitride micro powder; 1-3 parts of molybdenum boride micro powder; 3-7 parts basalt fiber; 1-3 parts of aqueous dispersant; 0.8 to 1.2 parts of coupling agent.

5. The heat insulation method according to claim 1, characterized in that: Both the inner and outer metal transition layers are mainly formed by a single spraying of metal transition coating.

6. The heat insulation method according to claim 5, characterized in that: The metallic transition coating comprises the following components in parts by weight: 55-65 parts of lithium potassium silicate composite solution; 18-22 parts of waterborne urea-formaldehyde resin; 8-12 parts of polyacrylol; 3-7 parts basalt fiber; 3-7 parts of zirconium dioxide micro powder.

7. The heat insulation method according to claim 1, characterized in that: The thicknesses of the inner wall metal transition layer, the inner wall heat insulation layer, and the inner wall microwave absorbing temperature control layer are 0.2~0.5mm, 15~20mm, and 0.7~0.9mm, respectively.

8. The heat insulation method according to claim 1, characterized in that: The thicknesses of the outer wall metal transition layer, the outer wall heat insulation layer, and the outer wall waterproof layer are 0.2~0.5mm, 3~5mm, and 0.7~0.9mm, respectively.

9. The thermal insulation method according to claim 7 or 8, characterized in that: The total thickness of the inner wall insulation layer and the outer wall insulation layer is 18~25mm.

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