Energy efficient furnace using modular furnace lining

Abstract

The utility model provides an energy -conserving furnace kiln of modularization furnace lining is used, including skeleton, the casing of setting in skeleton outside surface and erecting in skeleton inboard surface modularization furnace lining, modularization furnace lining includes the distribution of nanometer heat insulation reflection layer, high temperature fibre heat insulation layer and basic heat preservation layer from working face to non - working face in proper order, the material quality of nanometer heat insulation reflection layer includes A system or B system, high temperature fibre heat insulation layer includes superhigh temperature material or high temperature material. The utility model can replace corresponding modularization furnace lining according to the demand of sintering atmosphere, sintering temperature, obtain the best sintering temperature, efficiency and cost performance, and the sintering time and processing cost are reduced greatly, the lightweight skeleton structure is used with modularization furnace lining, and the total weight of the furnace body is about one third of the traditional brick structure, and the requirement of foundation bearing is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of industrial furnace technology, and in particular to an energy-saving furnace using modular furnace lining. Background Technology

[0002] Industrial kilns / furnaces are core thermal equipment used in industrial production for heating, melting, sintering, roasting, or heat treatment of materials. They are widely used in industries such as metallurgy, building materials, chemicals, ceramics, and glass, and are a key link in energy consumption and production efficiency. Their core function is to generate a high-temperature environment through fuel combustion or electrical energy conversion, causing physical or chemical changes in materials (such as ore smelting, cement clinker calcination, and ceramic sintering).

[0003] Traditional industrial furnaces typically use heavy refractory bricks for lining, which has drawbacks such as high weight, high thermal inertia, high energy consumption, and slow heating and cooling rates. The excessive overall weight also affects the ease of installation and maintenance. With technological advancements, all-fiber lining structures have emerged, reducing weight and improving thermal response. However, they suffer from low mechanical strength and are unsuitable for direct use as working surfaces to withstand airflow erosion or mechanical impacts. They require integration with refractory bricks and other structural elements, making it difficult to directly overcome the technical shortcomings of existing refractory bricks.

[0004] Furthermore, existing industrial furnaces suffer from a significant drawback: their lining structures are often designed for specific temperatures, lacking flexibility. This prevents optimization and adjustment based on varying process temperature requirements, leading to either excessive performance increasing costs or insufficient performance affecting service life. Particularly in the wide operating temperature range of 300-1550℃, there is a lack of an adaptively adjustable lining structure that balances performance and economy. Utility Model Content

[0005] In view of the shortcomings of the existing technology, this utility model provides an energy-saving furnace using modular furnace lining, which solves the problems of large furnace lining weight, high thermal inertia, or lack of flexible temperature adjustment capability in the existing technology.

[0006] According to an embodiment of the present invention, an energy-saving furnace using a modular furnace lining includes a frame, a shell disposed on the outer side of the frame, and a modular furnace lining mounted on the inner side of the frame. The frame as a whole forms a frame structure. The shell is installed on the outside of the frame and forms a closed structure that encloses the frame. The modular furnace lining is correspondingly installed on the inner side of the frame, thereby creating a closed furnace space inside the frame. Heating elements are disposed inside the furnace space.

[0007] The modular furnace lining includes a nano-insulating reflective layer, a high-temperature fiber insulation layer, and a basic insulation layer distributed sequentially from the working surface to the non-working surface. The nano-insulating reflective layer is made of either system A or system B, where system A is used for oxidizing or weakly reducing atmospheres, and system B is used for strongly reducing atmospheres. The high-temperature fiber insulation layer is made of ultra-high temperature material or high temperature material. The basic insulation layer is a rock wool board structure.

[0008] Furthermore, the thickness ratio of the high-temperature fiber insulation layer to the basic insulation layer is (1.5-2):1, and the thickness of the nano-insulation and reflective layer is 50-80mm.

[0009] Furthermore, the high-temperature fiber insulation layer adopts a polycrystalline alumina fiber structure made of ultra-high temperature material when the working temperature is ≥1300℃; and adopts aluminum silicate fiber material when the working temperature is <1300℃.

[0010] Furthermore, the modular furnace lining is also provided with anchors for the vertical working surface in the middle. The anchors pass through the nano-insulation and reflective layer, the high-temperature fiber insulation layer and the basic insulation layer in sequence, thereby connecting the three in series to form a stable integrated structure.

[0011] Furthermore, a high-temperature inorganic adhesive is provided between the nano-insulating reflective layer, the high-temperature fiber insulation layer, and the basic insulation layer for reinforcement.

[0012] Furthermore, the anchor is a threaded fastening structure, including a bolt rod and a screw rod arranged coaxially. One end of the screw rod is threaded into the inside of the bolt rod, and the other end of the screw rod penetrates the working surface of the nano-insulation and reflective layer and is vertically connected to a pressing piece. The other end of the bolt rod penetrates the base insulation layer and is connected to the frame.

[0013] Furthermore, adjacent modular furnace linings are joined together using mortise and tenon structures on their contacting sides, and the contact surfaces are reinforced with high-temperature sealant.

[0014] Furthermore, the heating element includes a silicon carbide rod, a silicon molybdenum rod, or a resistance wire.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The furnace in this utility model is a detachable structure. By removing the shell, the internal skeleton and modular lining can be directly exposed. The corresponding modular furnace lining can be replaced according to the requirements of sintering atmosphere and sintering temperature to obtain the best sintering temperature, efficiency and cost performance, and significantly reduce sintering time and processing cost.

[0017] 2. The modular lining in this application includes a nano-insulating and reflective layer, a high-temperature fiber insulation layer, and a basic insulation layer. Its overall heat capacity is extremely low, which greatly accelerates the heating and cooling rate of the furnace, shortens the production cycle, and saves 30%-40% energy compared to similar products.

[0018] 3. In this practical application, a nano-insulating reflective layer is used as the working surface of the modular inner lining. It has high heat reflection performance, which can effectively reduce radiative heat loss and enhance energy saving effect. At the same time, the nano-insulating reflective plate forms a smooth and complete working surface, ensuring that the temperature uniformity in the furnace reaches within ±5℃, significantly improving the consistency of product quality.

[0019] 4. In this practical application, there is no need to use heavy refractory bricks for overall construction. Instead, a lightweight frame structure is used in conjunction with a modular furnace lining. The furnace lining itself is also a non-solid material. The bulk density of the entire furnace lining is only 250-350 kg / m³, and the total weight of the furnace body is about one-third of that of a traditional brick structure, which greatly reduces the load-bearing requirements of the foundation. Furthermore, the modular furnace lining structure facilitates partial replacement and maintenance, reduces downtime, and lowers maintenance costs. Attached Figure Description

[0020] Figure 1 This is a frontal cross-sectional schematic diagram of an embodiment of the present utility model.

[0021] Figure 2 for Figure 1 An enlarged schematic diagram of part A in the middle.

[0022] Figure 3 This is a schematic diagram of the specific structure of a modular furnace lining.

[0023] In the above figures: 1. Frame; 2. Outer shell; 3. Modular inner lining; 4. Heating element; 5. Anchor; 11. Support leg; 12. Furnace chamber; 13. Mounting platform; 31. Nano-insulating reflective layer; 32. High-temperature fiber insulation layer; 33. Basic insulation layer; 51. Bolt rod; 52. Screw rod; 53. Pressing plate. Detailed Implementation

[0024] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0025] Example 1:

[0026] like Figure 1As shown, this utility model embodiment proposes an energy-saving furnace using a modular furnace lining, including a frame 1, a shell disposed on the outer side of the frame 1, and a modular furnace lining mounted on the inner side of the frame 1. The frame 1 forms a square frame structure, with supporting feet 11 around the bottom of the frame 1, and a frame space in the middle for installing the shell and furnace lining. One vertical surface is reserved for installing the furnace door, and the bottom surface is provided with a heat-resistant mounting platform 13. Preferably, in this embodiment, the frame 1 is made of 310S or RA330 heat-resistant alloy profile to ensure structural strength and heat resistance.

[0027] In this embodiment, the shell is made of 310S stainless steel plate to ensure sufficient external strength. The shell is installed outside the frame 1 to form a closed structure that encloses the frame 1. In this embodiment, the outer shell 2 is fixed to the root edge of the frame 1 near the inner side. The modular furnace lining is installed inside the frame 1, thereby creating a closed furnace chamber 12 space inside the frame 1. Adjacent modular furnace liners are joined by tenon and mortise structures on their contacting sides, and the contact surfaces are reinforced with high-temperature sealant. A heating element 4 is installed inside the furnace chamber 12 space. In this embodiment, the heating element 4 includes a silicon carbide rod, a silicon molybdenum rod, or a resistance wire, preferably a resistance wire.

[0028] In a further embodiment, the modular furnace lining includes a nano-insulating reflective layer 31, a high-temperature fiber insulation layer 32, and a basic insulation layer 33, which are distributed sequentially from the working surface to the non-working surface. The thickness ratio of the high-temperature fiber insulation layer 32 to the basic insulation layer 33 is (1.5-2):1, and the thickness of the nano-insulating reflective layer 31 is 50-80mm.

[0029] The nano-insulating and reflective layer 31 is made of either system A or system B. System A is used in oxidizing or weakly reducing atmospheres, and the raw materials include partially stabilized zirconium oxide, silicon carbide, and chopped alumina fibers, which are integrally sintered. System B is used in strongly reducing atmospheres, and the raw materials include high-purity alumina, hexagonal boron nitride, and chopped alumina fibers, which are integrally sintered. The high-temperature fiber insulation layer 32 includes ultra-high temperature materials or high-temperature materials. When the operating temperature is ≥1300℃, the high-temperature fiber insulation layer 32 adopts a polycrystalline alumina fiber structure made of ultra-high temperature materials; when the operating temperature is <1300℃, it adopts aluminum silicate fiber materials. The basic insulation layer 33 is a rock wool board structure.

[0030] In the specific design, the modular furnace lining is further equipped with anchors 5 perpendicular to the working surface in the middle. The anchors 5 sequentially penetrate the nano-insulating reflective layer 31, the high-temperature fiber insulation layer 32, and the basic insulation layer 33, thereby connecting the three in series to form a stable integrated structure. A high-temperature inorganic adhesive is also used for reinforcement between the nano-insulating reflective layer 31, the high-temperature fiber insulation layer, and the basic insulation layer 33.

[0031] Furthermore, the anchor 5 is a threaded fastening structure, including a bolt rod 51 and a screw rod 52 coaxially arranged. One end of the screw rod 52 is threaded into the inside of the bolt rod 51, and the other end of the screw rod 52 penetrates the working surface of the nano-insulating reflective layer 31 and is vertically connected to a pressing plate 53. The other end of the bolt rod 51 penetrates the base insulation layer 33 and is connected to the frame 1. During installation, holes are pre-drilled at the center positions of the nano-insulating reflective layer 31, the high-temperature fiber insulation layer 32, and the base insulation layer 33. Then, the bolt rod 51 is fixed to the frame 1 by welding, threaded connection, or other methods. Then, the screw rod 52 is penetrated from one side of the working surface until it abuts against the bolt rod 51. Subsequently, the screw rod 52 is rotated so that its thread is screwed into the inside of the bolt rod 51 and moves towards the non-working surface end. Once the pressing plate 53 is tightly pressed against the surface of the nano-insulating reflective layer 31, the fixing is completed.

[0032] In this implementation, a 60mm thick A-system nano-insulation and reflective layer 31, a 300mm thick polycrystalline alumina fiberboard high-temperature fiber insulation layer 32, and a 150mm thick high-density rock wool board basic insulation layer 33 are used.

[0033] Actual performance indicators: density 380kg / m³, thermal conductivity 0.142W / (m·K), thermal reflectivity 88%, heating time to 1400℃ is about 85 minutes, furnace temperature uniformity ±5℃.

[0034] Example 2:

[0035] In this embodiment, the rest are the same as in embodiment 1, except that: a 60mm thick A-system nano-insulation and reflective layer 31, a 250mm thick aluminum silicate fiberboard high-temperature fiber insulation layer 32, and a 150mm thick rock wool board basic insulation layer 33 are used.

[0036] Actual performance indicators: density 320kg / m³, thermal conductivity 0.135W / (m·K), thermal reflectivity 87%, heating time to 1250℃ is about 60 minutes, furnace temperature uniformity ±4℃.

[0037] Example 3:

[0038] In this embodiment, the rest are the same as in Embodiment 1, except that: an 80mm thick B-system nano-insulation and reflective layer 31, a 240mm thick aluminum silicate fiberboard high-temperature fiber insulation layer 32, and a 180mm thick rock wool board basic insulation layer 33 are used.

[0039] Actual performance indicators: density 350kg / m³, thermal conductivity 0.139W / (m·K), thermal reflectivity 86%, heating time to 1200℃ is about 65 minutes, furnace temperature uniformity ±4℃.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An energy-saving furnace using modular lining, characterized in that: The furnace includes a frame, a shell disposed on the outer side of the frame, and a modular furnace lining mounted on the inner side of the frame. The frame as a whole forms a frame structure. The shell is installed on the outside of the frame and forms a closed structure that encloses the frame. The modular furnace lining is installed on the inner side of the frame, thereby creating a closed furnace space inside the frame. Heating elements are installed inside the furnace space. The modular furnace lining includes a nano-insulating reflective layer, a high-temperature fiber insulation layer, and a basic insulation layer distributed sequentially from the working surface to the non-working surface. The nano-insulating reflective layer is made of either system A or system B, where system A is used for oxidizing or weakly reducing atmospheres, and system B is used for strong reducing atmospheres. The high-temperature fiber insulation layer is made of ultra-high temperature material or high temperature material. The basic insulation layer is a rock wool board structure.

2. An energy-saving furnace using a modular lining as described in claim 1, characterized in that: The thickness ratio of the high-temperature fiber insulation layer to the basic insulation layer is (1.5-2):1, and the thickness of the nano-insulation and reflective layer is 50-80mm.

3. An energy-saving furnace using a modular lining as described in claim 1, characterized in that: The high-temperature fiber insulation layer adopts a polycrystalline alumina fiber structure made of ultra-high temperature material when the working temperature is ≥1300℃; and adopts aluminum silicate fiber material when the working temperature is <1300℃.

4. An energy-saving furnace using a modular lining as described in claim 1, characterized in that: The modular furnace lining is also equipped with anchors in the middle of the vertical working surface. The anchors pass through the nano-insulation and reflective layer, the high-temperature fiber insulation layer and the basic insulation layer in sequence, thereby connecting the three in series to form a stable integrated structure.

5. An energy-saving furnace using a modular lining as described in claim 4, characterized in that: A high-temperature inorganic adhesive is also provided between the nano-insulating reflective layer, the high-temperature fiber insulation layer, and the basic insulation layer for reinforcement.

6. An energy-saving furnace using a modular lining as described in claim 4, characterized in that: The anchor is a threaded fastening structure, including a bolt rod and a screw rod arranged coaxially. One end of the screw rod is threaded into the inside of the bolt rod. One end of the screw rod penetrates the working surface of the nano-insulation and reflective layer and is vertically connected to a pressing piece. One end of the bolt rod penetrates the base insulation layer and is connected to the frame.

7. An energy-saving furnace using a modular lining as described in claim 1, characterized in that: Adjacent modular furnace linings are joined together using mortise and tenon joints on their contacting sides, and the contact surfaces are reinforced with high-temperature sealant.

8. An energy-saving furnace using a modular lining as described in claim 1, characterized in that: The heating element includes a silicon carbide rod, a silicon molybdenum rod, or a resistance wire.

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