Thermal insulation structure for high-temperature section of tunnel kiln

Abstract

The utility model discloses a tunnel kiln high-temperature section heat preservation structure which comprises a tunnel kiln body, a high-temperature section is formed in the tunnel kiln body, and the left side of the high-temperature section is communicated with a preheating section. According to the tunnel kiln, the heat insulation cavity with the U-shaped section is formed in the refractory brick wall of the high-temperature section of the tunnel kiln body, and the first heat insulation layer and the second heat insulation layer of the high-temperature-resistant ceramic type are laid on the two faces of the inner side of the heat insulation cavity; a plurality of air exhaust nozzles arranged on the air exhaust pipeline at equal intervals are promoted to exhaust air in the heat insulation cavity, the heat insulation cavity after air exhaust is promoted to form a vacuum zone on the periphery of the high-temperature section of the tunnel kiln body, heat conduction is blocked by combining a first heat preservation layer and a second heat preservation layer, and heat loss of the high-temperature section can be remarkably reduced; an inner wall heat preservation layer composed of an upper fireproof cotton layer, a side fireproof cotton layer and a gap fireproof cotton layer is laid on the high-temperature section, and the heat preservation effect of the high-temperature section is further improved on the basis that the heat insulation cavity is vacuumized.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel kilns, in particular to a heat preservation structure of a high-temperature section of a tunnel kiln. Background Art

[0002] Tunnel kiln is a modern continuous firing thermal equipment, which is widely used in the roasting production of ceramic products and is also widely used in metallurgical industries such as abrasives. During the use of existing tunnel kilns, refractory bricks laid on the inner wall are usually used to block heat in order to ensure the energy saving and thermal insulation performance of the tunnel kiln. Since the refractory brick layer of the tunnel kiln is a solid structure and the refractory brick layer is in contact with the conventional bricks laid on the outside of the tunnel kiln, a large amount of heat still escapes from the tunnel kiln, and the refractory bricks are subjected to high temperature for a long time, resulting in a decrease in heat resistance, which is not conducive to the energy saving and heat resistance of the tunnel kiln.

[0003] In the prior art, publication number CN208832976U discloses a heat circulation tunnel kiln, including a tunnel kiln body, which is composed of an outer wall and an inner insulation brick wall. The tunnel kiln body is divided into a preheating zone, a firing zone and a cooling zone. The inner walls on both sides of the outer wall are provided with inner insulation brick walls. The top of the tunnel kiln body is provided with a heating main pipeline. One end of the cooling zone passes through the inner insulation brick wall and the outer wall and is provided with a first lower circulation pipeline. The other end of the first lower circulation pipeline is fixedly installed with a first exhaust fan. The top of the first exhaust fan is fixedly connected with a first upper circulation pipeline. The other end of the first upper circulation pipeline is connected to the heating main pipeline. By adding an exhaust fan and a circulation pipeline, the waste heat generated during cooling water spraying and the waste heat emitted during heating and baking are recycled and reused to avoid a large amount of heat waste. The inner wall is made of bricks, and the heat in the heating cavity enters the channel of the tunnel kiln through the gap of the inner wall. The outer wall adopts a closed structure to avoid a large amount of heat leakage.

[0004] However, the closed insulation structure of the outer wall of the tunnel kiln mentioned above has a reduced heat resistance as the refractory bricks are subjected to high temperature for a long time. In the long run, it is difficult to meet the insulation needs of the high-temperature section of the tunnel kiln.

[0005] To this end, a tunnel kiln high temperature section insulation structure is proposed, which has the advantage of improving the insulation effect of the tunnel kiln high temperature section, thereby solving the problems in the above-mentioned background technology. Utility Model Content

[0006] The utility model aims to solve the shortcomings in the prior art and proposes a tunnel kiln high temperature section heat preservation structure.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a tunnel kiln high-temperature section insulation structure, including a tunnel kiln body, a high-temperature section is formed inside the tunnel kiln body, and the left side of the high-temperature section is connected to a preheating section, an insulation cavity is opened in the refractory brick wall of the tunnel kiln body corresponding to the high-temperature section, and the first insulation layer and the second insulation layer are respectively laid on both sides of the insulation cavity, an inner wall surface of the high-temperature section is laid with an inner wall insulation layer, and the inner wall insulation layer is composed of an upper refractory cotton layer, a side refractory cotton layer, and a gap refractory cotton layer, the gap refractory cotton layer is located on the inner side of the inner wall insulation layer, and the gap refractory cotton layer is distributed in the gap between the upper refractory cotton layer and the side refractory cotton layer, a vacuum pump is fixedly installed on the left side wall of the tunnel kiln body, and an exhaust pipe is connected to the exhaust port of the vacuum pump, and an exhaust pipe is connected to the exhaust port of the vacuum pump, and a plurality of exhaust nozzles are arranged at equal intervals on the surface of the exhaust pipe, and each exhaust nozzle is connected to the insulation cavity.

[0008] As a further description of the above technical solution: a branch pipe connected to the preheating section is arranged on the surface of the exhaust pipe, and a valve is installed on the surface of the branch pipe.

[0009] As a further description of the above technical solution: the upper refractory wool layer of the inner wall insulation layer corresponds to the kiln roof of the tunnel kiln body, and the side refractory wool layer of the inner wall insulation layer corresponds to the kiln wall of the tunnel kiln body.

[0010] As a further description of the above technical solution: the first thermal insulation layer and the second thermal insulation layer are both made of high temperature resistant ceramic materials, and the cross-sections of the first thermal insulation layer and the second thermal insulation layer are both arranged in a U-shaped structure.

[0011] As a further description of the above technical solution: two sets of kiln car guide rails are arranged at the lower inner part of the tunnel kiln body, and the two sets of kiln car guide rails are symmetrically arranged on both sides of the interior of the tunnel kiln body.

[0012] As a further description of the above technical solution: a pressure gauge is fixed to the lower side of the tunnel kiln body, and the probe of the pressure gauge extends into the insulation cavity.

[0013] The utility model has the following beneficial effects:

[0014] In the utility model, a heat-insulating cavity with a U-shaped cross-section is opened in the refractory brick wall of the high-temperature section of the tunnel kiln body, and a first high-temperature ceramic insulation layer and a second insulation layer are laid on both sides of the inner side of the heat-insulating cavity. By starting the vacuum pump, a plurality of exhaust nozzles arranged at equal intervals on the exhaust pipe are prompted to extract the air inside the heat-insulating cavity, so that the heat-insulating cavity from which the air has been evacuated forms a vacuum zone at the periphery of the high-temperature section of the tunnel kiln body. Combined with the first insulation layer and the second insulation layer, the conduction of heat is blocked, which can significantly reduce the heat loss in the high-temperature section. By laying an inner wall insulation layer composed of an upper refractory cotton layer, a side refractory cotton layer and a gap refractory cotton layer in the high-temperature section, the insulation effect of the high-temperature section is further improved on the basis of evacuating the heat-insulating cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the heat preservation structure of the high temperature section of the tunnel kiln of the utility model;

[0016] Figure 2 This is a high temperature section analysis diagram of the high temperature section insulation structure of the utility model tunnel kiln;

[0017] Figure 3 The utility model is a schematic diagram of the inner wall insulation layer structure of the high temperature section insulation structure of the tunnel kiln.

[0018] Legend:

[0019] 1. Tunnel kiln body; 2. Preheating section; 3. High temperature section; 4. Inner wall insulation layer; 5. Insulation cavity; 6. Vacuum pump; 7. Exhaust pipe; 8. Exhaust pipe; 9. Exhaust nozzle; 10. Kiln car guide rail; 11. First insulation layer; 12. Second insulation layer; 13. Upper refractory wool layer; 14. Side refractory wool layer; 15. Gap refractory wool layer. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] According to an embodiment of the utility model, a heat preservation structure of a high temperature section of a tunnel kiln is provided.

[0022] The present invention is now further described in conjunction with the accompanying drawings and specific implementation methods. Figure 1-3As shown, the high temperature section insulation structure of the tunnel kiln according to the embodiment of the utility model includes a tunnel kiln body 1, a high temperature section 3 is formed inside the tunnel kiln body 1, and the left side of the high temperature section 3 is connected with a preheating section 2, and a heat insulation cavity 5 is opened in the refractory brick wall of the tunnel kiln body 1 corresponding to the high temperature section 3, and the first insulation layer 11 and the second insulation layer 12 are respectively laid on both sides of the insulation cavity 5, the inner wall surface of the high temperature section 3 is laid with an inner wall insulation layer 4, and the inner wall insulation layer 4 is composed of an upper refractory cotton layer 13, a side refractory cotton layer 14, and a gap refractory cotton layer 15, the gap refractory cotton layer 15 is located on the inner side of the inner wall insulation layer 4, and the gap refractory cotton layer 15 is distributed in the gap between the upper refractory cotton layer 13 and the side refractory cotton layer 14, and the left side of the tunnel kiln body 1 A vacuum pump 6 is fixedly installed on the wall, and an exhaust pipe 7 is connected to the exhaust port of the vacuum pump 6, and an exhaust pipe 8 is connected to the exhaust port of the vacuum pump 6. A plurality of exhaust nozzles 9 are arranged at equal intervals on the surface of the exhaust pipe 7, and each exhaust nozzle 9 is connected to the heat insulation chamber 5. For the vacuum pump 6, the control method of the utility model is to control it by manually starting and closing the switch. The wiring diagram of the power element and the provision of power supply belong to the common knowledge in this field, and the utility model is mainly used to protect mechanical devices, so the utility model will not explain the control method and wiring arrangement in detail. The upper refractory cotton layer 13, the side refractory cotton layer 14, and the gap refractory cotton layer 15 are all made of refractory cotton material and installed with a refractory adhesive;

[0023] In one embodiment, a branch pipe connected to the preheating section 2 is provided on the surface of the exhaust duct 8, and a valve is installed on the surface of the branch pipe. Through the setting of the branch pipe and the valve, the hot air exhausted in the early stage of vacuuming can be passed into the preheating section 2 to achieve the purpose of waste heat utilization. After the vacuuming is completed, the valve of the branch pipe can be closed.

[0024] In one embodiment, the upper refractory wool layer 13 of the inner wall insulation layer 4 corresponds to the kiln roof of the tunnel kiln body 1, and the side refractory wool layer 14 of the inner wall insulation layer 4 corresponds to the kiln wall of the tunnel kiln body 1, that is, the upper refractory wool layer 13 is laid on the kiln roof of the tunnel kiln body 1, and the side refractory wool layer 14 is laid on the kiln wall of the tunnel kiln body 1, so as to achieve the purpose of all-round insulation of the high-temperature section 3.

[0025] In one embodiment, the first thermal insulation layer 11 and the second thermal insulation layer 12 are both made of high-temperature resistant ceramic materials, and the cross-sections of the first thermal insulation layer 11 and the second thermal insulation layer 12 are both U-shaped structures. Through the setting of the first thermal insulation layer 11 and the second thermal insulation layer 12, heat can be blocked and heat loss can be reduced.

[0026] In one embodiment, two sets of kiln car guide rails 10 are arranged at the lower inner part of the tunnel kiln body 1, and the two sets of kiln car guide rails 10 are symmetrically arranged on both sides of the inner part of the tunnel kiln body 1. Through the arrangement of the kiln car guide rails 10, a guiding structure is provided for the kiln car to facilitate the movement of the kiln car.

[0027] In one embodiment, a pressure gauge is fixed to the lower side of the tunnel kiln body 1, and the probe of the pressure gauge extends into the insulation cavity 5. Through the setting of the pressure gauge, the air pressure inside the insulation cavity 5 can be detected to understand the vacuum state.

[0028] Working principle:

[0029] When in use, an insulation cavity 5 with a U-shaped cross-section is opened in the refractory brick wall of the high-temperature section 3 of the tunnel kiln body 1, and a first high-temperature ceramic insulation layer 11 and a second insulation layer 12 are laid on both sides of the inner side of the insulation cavity 5. When the tunnel kiln is working, the vacuum pump 6 is started to cause a number of exhaust nozzles 9 arranged at equal intervals on the exhaust pipe 7 to extract the air inside the insulation cavity 5, so that the insulation cavity 5 from which the air has been evacuated forms a vacuum zone around the high-temperature section 3 of the tunnel kiln body 1. Combined with the first insulation layer 11 and the second insulation layer 12, the conduction of heat is blocked, which can significantly reduce the heat loss of the high-temperature section 3. By laying an inner wall insulation layer 4 composed of an upper refractory wool layer 13, a side refractory wool layer 14, and a gap refractory wool layer 15 in the high-temperature section 3, the gap refractory wool layer 15 can fill the gap at the connection between the upper refractory wool layer 13 and the side refractory wool layer 14, thereby further improving the insulation effect of the high-temperature section 3.

[0030] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tunnel kiln high temperature section insulation structure, comprising a tunnel kiln body (1), characterized in that: A high temperature section (3) is formed inside the tunnel kiln body (1), and the left side of the high temperature section (3) is connected to the preheating section (2). A heat insulation cavity (5) is opened in the refractory brick wall of the tunnel kiln body (1) corresponding to the high temperature section (3), and the two sides of the heat insulation cavity (5) are respectively paved with a first insulation layer (11) and a second insulation layer (12). The inner wall surface of the high temperature section (3) is paved with an inner wall insulation layer (4), and the inner wall insulation layer (4) is composed of an upper refractory cotton layer (13), a side refractory cotton layer (14), and a gap refractory cotton layer (15). The gap refractory cotton layer (15) is located on the inner side of the inner wall insulation layer (4), and the gap refractory cotton layer (15) is distributed in the gap between the upper refractory cotton layer (13) and the side refractory cotton layer (14). A vacuum pump (6) is fixedly installed on the left side wall of the tunnel kiln body (1), and the vacuum pump (6) is connected to a vacuum pipe (7) at the vacuum port, and the vacuum pump (6) is connected to an exhaust pipe (8) at the exhaust port. A plurality of vacuum nozzles (9) are arranged at equal intervals on the surface of the vacuum pipe (7), and each vacuum nozzle (9) is connected to the heat insulation cavity (5).

2. The tunnel kiln high temperature section insulation structure according to claim 1 is characterized in that: The surface of the exhaust pipe (8) is provided with a branch pipe connected to the preheating section (2), and a valve is installed on the surface of the branch pipe.

3. The tunnel kiln high temperature section insulation structure according to claim 1 is characterized in that: The upper refractory wool layer (13) of the inner wall insulation layer (4) corresponds to the kiln top of the tunnel kiln body (1), and the side refractory wool layer (14) of the inner wall insulation layer (4) corresponds to the kiln wall of the tunnel kiln body (1).

4. The heat preservation structure of the high temperature section (3) of the tunnel kiln according to claim 1, characterized in that: The first thermal insulation layer (11) and the second thermal insulation layer (12) are both made of high temperature resistant ceramic material, and the cross-sections of the first thermal insulation layer (11) and the second thermal insulation layer (12) are both arranged in a U-shaped structure.

5. The tunnel kiln high temperature section insulation structure according to claim 1 is characterized by: Two groups of kiln car guide rails (10) are arranged at the lower inner part of the tunnel kiln body (1), and the two groups of kiln car guide rails (10) are symmetrically arranged on both sides of the interior of the tunnel kiln body (1).

6. The tunnel kiln high temperature section insulation structure according to claim 1, characterized in that: A pressure gauge is fixed to the lower side of the tunnel kiln body (1), and a probe of the pressure gauge extends into the heat insulation cavity (5).

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