External thermal insulation structure of heating flame path of roasting furnace

Abstract

The utility model discloses an external thermal insulation structure of a heating flame path of a roasting furnace, which comprises a thermal insulation cotton blanket and a concrete wallboard, and is characterized by further comprising a high-aluminum fiber blanket, a high-aluminum polyhydrogen brick, a light clay thermal insulation brick and a high-aluminum fiber felt, the high-aluminum fiber blanket, the high-aluminum hydrogen building bricks, the light clay heat preservation bricks and the high-aluminum fiber felt are sequentially arranged between the outermost heating flame path and the heat preservation cotton blanket. The high-aluminum fiber blanket added between the heating flame path and the heat preservation brick wall plays a good role in heat insulation and heat preservation, the use amount of natural gas is reduced, and damage to the heat preservation brick wall caused by deformation of the heating flame path on the outer side is prevented.

Description

Technical Field

[0001] The utility model relates to a heat preservation structure, in particular to an external heat preservation structure for heating a carbon roasting furnace. Background Art

[0002] The current carbon roasting furnace chamber structure includes: heating fire channel, material box (metallurgical coke particles and anode carbon blocks), insulation wall, and concrete wall panel. The number of heating fire channels in each roasting furnace chamber is an odd number, and the number of material boxes is an even number, and the number of heating fire channels is the number of material boxes + 1. The layout from the center of the furnace chamber to both sides is: heating fire channel-material box-heating fire channel-material box...heating fire channel-insulation wall-concrete wall panel. The process flow is: natural gas is sprayed into the heating fire channel for combustion, and the material inside the material box is heated by heat transfer. When the temperature of the material inside the material box reaches above 200°C, the volatile matter of the material enters the heating fire channel from the material box for combustion. The heating fire channel in the middle of the furnace chamber is adjacent to the material box, and the heat surrounds these two parts, while the outermost heating fire channel is adjacent to the material box on one side and the insulation wall on the other side. The purpose of setting up the insulation wall is to prevent the temperature in the outermost heating fire channel from radiating outward, thereby causing heat loss.

[0003] The external insulation structure of the heating channel of the current carbon roasting furnace includes: insulation bricks, insulation blankets, and concrete wall panels. The problems with this structure are: ① After the furnace has been in operation for 3-4 years, the bricks on the outer side of the outermost heating channel will age and crack, which will easily burn the insulation brick wall, making it difficult to repair the furnace wall, resulting in excessive heat loss and increased natural gas usage. ② According to the thermal conductivity of the insulation bricks, the number of insulation bricks used and the number of arrangements will increase, which will increase the construction cost. Utility Model Content

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an external thermal insulation structure of a roasting furnace heating fire channel, including a thermal insulation cotton blanket and a concrete wall panel, and also including a high-aluminum fiber blanket, a high-aluminum polyhydrogen brick, a lightweight clay thermal insulation brick, and a high-aluminum fiber felt. The high-aluminum fiber blanket, high-aluminum polyhydrogen brick, lightweight clay thermal insulation brick, and high-aluminum fiber felt are sequentially arranged between the outermost heating fire channel and the thermal insulation cotton blanket.

[0005] Furthermore, the thickness of the high-aluminum fiber blanket is 20 mm.

[0006] The density of the high alumina polyhydrogen brick is 1.0 mg / mm 3 .

[0007] The utility model mainly has the following beneficial effects: when the temperature of the heating furnace chamber is the highest value (≥1150℃) in the original insulation structure, the detection temperature of the concrete wall is 180-200℃, and when the temperature of the heating furnace chamber is the highest value (≥1150℃) in the new insulation structure, the detection temperature of the concrete wall is 110-150℃. The high-aluminum fiber blanket added between the heating fire channel and the insulation brick wall plays a good role in heat insulation, reduces the amount of natural gas used, and prevents the deformation of the outer heating fire channel from damaging the insulation brick wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of the original furnace structure;

[0009] Figure 2 This is an enlarged view of the structure at A of the original furnace type;

[0010] Figure 3 This is a schematic diagram of the new furnace structure of this application;

[0011] Figure 4 This is an enlarged view of the new furnace structure B of this application;

[0012] Figure 5 This is an enlarged view of the new furnace structure C of this application;

[0013] In the figure: 1. Heating fire channel; 2. Material box; 3. Heavy clay insulation bricks; 4. Light clay insulation bricks; 5. Insulation cotton blanket; 6. Concrete wall panel; 7. High aluminum fiber blanket; 8. High aluminum polyhydrogen brick; 9. High aluminum fiber felt. DETAILED DESCRIPTION

[0014] In order to make the technical means, creative features, purpose and efficacy of the utility model easy to understand, the utility model is further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the utility model, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the utility model. The experimental methods in the following embodiments are conventional methods unless otherwise specified, and the materials, reagents, etc. used in the following embodiments are all commercially available unless otherwise specified.

[0015] Embodiment 1:

[0016] A roasting furnace heating channel external insulation structure, including (density 120kg / m 3 ) insulation blanket 5 and concrete wall panel 6, including (density 128kg / m 3 ) High aluminum fiber blanket 7, (density 1.0mg / mm 3 ) High alumina polyhydrogen brick 8, (density 0.8mg / mm 3)Lightweight clay insulation brick 4, (density 258kg / m 3 ) high alumina fiber felt 9, the high alumina fiber blanket 7, high alumina polyhydrogen brick 8, lightweight clay insulation brick 4, and high alumina fiber felt 9 are arranged in sequence between the outermost heating fire channel 1 and the insulation cotton blanket 5.

[0017] like Figure 1-2 As shown, compared with the original furnace type, its insulation structure is: heating fire channel-350mm thick heavy insulation brick-350mm thick light insulation brick-70mm thick insulation blanket.

[0018] like Figure 3-5 As shown, the new insulation structure is: heating fire channel-350mm thick high-aluminum polyhydrogen brick-230mm thick lightweight insulation brick-120mm thick high-aluminum fiber felt-70mm thick insulation blanket.

[0019] According to the temperature of the heating fire channel (maximum temperature 1250°C), this application adds a layer of 20mm thick high-aluminum fiber blanket (operating temperature ≤1260°C, linear shrinkage <3%, thermal conductivity: 0.22W / mk) between the heating fire channel and the insulation wall to prevent the flame from directly contacting the insulation bricks after aging cracks appear on the bricks on the outside of the outermost heating fire channel, thereby avoiding burning of the insulation brick wall and heat loss.

[0020] Secondly, the original density of 1.3mg / mm 3 Heavy clay insulation bricks 3 and 0.8mg / mm 3 The lightweight clay insulation brick 4 is changed to a density of 1.0mg / mm 3 High alumina polyhydrogen brick 8 and 0.8mg / mm 3 Lightweight clay insulation brick 4. Density 1.0mg / mm 3 The high-alumina polyhydrogen brick 8 has a compressive strength of 4.5-5Mpa, a refractory temperature of 1600℃, a thermal conductivity of 0.2-0.4W / mk, and a density of 1.3mg / mm 3 The heavy clay insulation brick 3 has a compressive strength of 3.5-4.5Mpa, a refractory temperature of 1350℃, and a thermal conductivity of ≤0.55W / mk.

[0021] The comparison of the physical and chemical indicators of the two types of insulation bricks leads to the following conclusions: ① The high-alumina polyhydrogen brick is used as the outer layer of the insulation wall block in contact with the outer heating channel. Its compressive strength is more effective in reducing the vertical wall changes caused by the expansion and deformation of the heating channel; ② The lower thermal conductivity of the high-alumina polyhydrogen brick is more conducive to the insulation effect of the outer side of the heating channel, effectively reducing heat loss.

[0022] Without affecting the structural strength, 230mm thick lightweight insulation bricks + 120mm high-aluminum fiber felt are used instead of 350mm lightweight insulation bricks, and the insulation effect of the structure is significantly improved.

[0023] During the construction of the roasting workshops in 2021 and 2023, a new type of roasting furnace insulation wall structure was adopted. The data from multiple temperature tests on the outside of the concrete wall panels showed that the highest temperature on the outside of the concrete wall panels was 89°C. The temperature on the outside of the concrete wall panels of the roasting furnaces currently in operation that do not follow the new insulation structure is all above 150°C.

[0024] Although an embodiment of the utility model has been shown and described, this specific embodiment is merely an explanation of the utility model and is not a limitation of the utility model. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the utility model. However, as long as they are within the scope of the claims of the utility model, they are protected by patent law.

Claims

1. A roasting furnace heating channel external insulation structure, comprising an insulation blanket and a concrete wallboard, characterized in that: It also includes high-aluminum fiber blanket, high-aluminum polyhydrogen brick, light clay insulation brick and high-aluminum fiber felt, which are arranged in sequence between the outermost heating fire channel and the insulation cotton blanket.

2. The external heat insulation structure of the heating channel of a roasting furnace according to claim 1, characterized in that: The thickness of the high-aluminum fiber blanket is 20 mm.

3. The external heat insulation structure of the heating channel of a roasting furnace according to claim 2, characterized in that: The density of the high alumina polyhydrogen brick is 1.0 mg / mm 3 .

Images