Tunnel kiln waste heat recovery device

Abstract

The utility model discloses a tunnel kiln waste heat recovery device which comprises a preheating box, a cooling box, a tunnel kiln, an inflation pipe, a flow dividing structure and an air flow drainage structure, and the preheating box and the cooling box are installed on the two sides of the tunnel kiln respectively. The preheating box is installed on the tunnel kiln, the cooling box is installed on the preheating box, the inflation pipe is inserted into the tunnel kiln and the cooling box, the flow dividing structure and the airflow drainage structure are installed on the inner side of the tunnel kiln, and the airflow drainage structure is connected to the preheating box and the cooling box. The inner side of the tunnel kiln is effectively separated and sealed through the design of the inflation pipe and the flow dividing structure, the U-shaped airflow drainage pipe and the drainage pump are matched, airflow flows in an S shape, high-temperature airflow heat is fully recycled, and the waste heat utilization efficiency is improved; the coiled inductance heater is combined with the metal rod, heat is effectively transferred into the tunnel kiln according to the inductance heating principle, and the heating effect is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of kiln waste heat recovery technology, specifically a tunnel kiln waste heat recovery device. Background Technology

[0002] With the development of tunnel kiln technology, various waste heat recovery devices have been widely used. However, these products still have some problems in practical use. For example, current tunnel kiln waste heat recovery devices on the market typically adopt a simple heat exchange tube design, which has low heat exchange efficiency and is prone to scaling and corrosion under high-temperature conditions, leading to a shortened equipment lifespan. This results in low energy utilization efficiency and high maintenance costs in some scenarios.

[0003] To improve performance, some manufacturers have attempted to increase recovery efficiency by adding multi-stage heat exchangers and automatic control devices. However, such improvements often face challenges such as structural complexity, high costs, and significant maintenance difficulties in practical applications.

[0004] A search revealed a plastic product hot-melt coarse processing and recycling device with publication number CN108724530B, published on April 17, 2020. This design employs closed hot-melt technology, achieving efficient hot-melt treatment of waste plastics through a hot-melt installation cylinder and a guide feed cylinder. While this structure offers high heat transfer efficiency and harmless waste gas recirculation, it is primarily suitable for recycling plastic products and not for the efficient recovery and utilization of waste heat from tunnel kilns. Furthermore, the device is prone to scaling under high-temperature conditions, affecting long-term stable operation.

[0005] A search revealed a waste liquid recovery device for paper mills, publication number CN108704342B, published on November 17, 2020. This design utilizes vortex technology to concentrate fine fibers in the waste liquid at a central location, achieving efficient recovery through a scooping mechanism and a drying mechanism. While this structure performs well in pulp recovery, it is not suitable for recovering waste heat from tunnel kilns. Furthermore, the vortex technology and scooping mechanism of this device are difficult to apply to the efficient recovery of high-temperature gases, and the equipment structure is relatively complex, resulting in high maintenance costs.

[0006] The above problems indicate that traditional waste heat recovery devices currently on the market are inadequate to effectively meet the needs of efficient recovery and utilization of waste heat from tunnel kilns. While existing technologies may already provide solutions to these problems, this case aims to provide an alternative or replacement technical solution. Utility Model Content

[0007] To achieve the above objectives, this utility model provides the following technical solution: a waste heat recovery device for a tunnel kiln, comprising: a preheating box, a cooling box, a tunnel kiln, an air-filling pipe, a flow-diverting structure, and an airflow guiding structure. The preheating box and the cooling box are respectively installed on both sides of the tunnel kiln. The air-filling pipe is inserted into the tunnel kiln and the cooling box. The flow-diverting structure and the airflow guiding structure are installed on the inner side of the tunnel kiln. The airflow guiding structure is connected to the preheating box and the cooling box. The airflow guiding structure includes: several U-shaped airflow guiding pipes, a pair of guiding pumps, a coiled inductive heater, several metal rods, a long airflow return pipe, a short airflow return pipe, two pairs of toothed guiding pipes, a pair of circulating pumps, and a pair of L-shaped circulating pipes.

[0008] Several U-shaped airflow guide pipes are respectively cross-installed on the tunnel kiln. The long airflow return pipe and the short airflow return pipe are inserted into the tunnel kiln and connected to the preheating box. A pair of guide pumps are respectively connected to the long airflow return pipe and the short airflow return pipe. Two pairs of toothed guide pipes are respectively inserted into the preheating box and the cooling box. A pair of L-shaped circulation pipes are respectively connected to the two pairs of toothed guide pipes. A pair of circulation pumps are respectively installed on the pair of L-shaped circulation pipes. The air filling pipe is inserted into the tunnel kiln. Several metal rods are evenly inserted into the air filling pipe. The coiled inductive heater is inserted into the air filling pipe.

[0009] It should be noted that, as described above, the gas is unidirectionally diverted through the inflation pipe, thereby guiding the gas inside the cooling box to the inner center of the tunnel kiln. A diversion structure separates and seals the inner side of the tunnel kiln. Several U-shaped airflow diversion pipes divert airflow into several sealed spaces. A pair of diversion pumps, in conjunction with these U-shaped pipes, guide the airflow in an S-shaped pattern along these sealed spaces, thus diverting the high-temperature airflow sequentially into each sealed space. This, in turn, diverts the cooled gas to the pre-cooled area. Inside the hot box and cooling box, the air inside the tunnel kiln and cooling box is drawn to the inside of the preheating box through the cooperation of long and short airflow return pipes. At the same time, several metal rods inside the air filling pipe are inductively heated by a coiled inductive heater. The inductive heating causes the metal rods to reach high temperatures. The heat from the metal rods is drawn to the inside of the tunnel kiln by the flowing air. The high temperature generated by the heating is then further guided by the airflow and assisted by the equipment inside the preheating box.

[0010] Preferably, the diversion structure includes: a plurality of concave sealing boxes, a plurality of convex sealing blocks, a plurality of concave limiting blocks, a plurality of concave rubber rings, and a plurality of sealing electric push rods;

[0011] A plurality of concave sealing boxes are evenly inserted into the inner side of the tunnel kiln; a plurality of convex sealing blocks are movably inserted into the inner side of the plurality of concave sealing boxes; a plurality of concave limiting blocks are evenly installed into the inner side of the tunnel kiln, and the plurality of concave limiting blocks are located at the top of the plurality of concave sealing boxes; a plurality of concave rubber rings are respectively installed into the inner side of the plurality of concave limiting blocks; and a plurality of sealing electric push rods are respectively installed into the inner side of the plurality of concave sealing boxes.

[0012] It should be noted that, as described above, the extension and retraction of the sealing electric push rods inside the concave sealing boxes respectively drive the convex sealing blocks on them, so that the convex sealing blocks can move stably and vertically along the inner side of the concave sealing boxes respectively, and the concave rubber rings inside the concave sealing blocks and concave limiting blocks seal the concave sealing boxes and concave limiting blocks.

[0013] Preferably, the preheating box and the cooling box are provided with heat-conducting connecting pipes, and an auxiliary air-guiding fan is provided on the inner side of the heat-conducting connecting pipes.

[0014] Preferably, a number of temperature sensors are provided on the inner side of the tunnel kiln.

[0015] Preferably, the inner sides of the heat-conducting connecting pipe, the plurality of U-shaped airflow guiding pipes, the long airflow return pipe, and the short airflow return pipe are respectively provided with horn-shaped unidirectional plates.

[0016] Preferably, a number of rotating fans are provided on the inner side of the tunnel kiln. Beneficial effects

[0017] This utility model provides a waste heat recovery device for tunnel kilns. Compared with existing technologies, this waste heat recovery device for tunnel kilns achieves effective separation and sealing of the inner side of the tunnel kiln through the design of the air-filling pipe and the diversion structure. Combined with the U-shaped airflow guide pipe and the guide pump, the airflow flows in an S-shape, fully recovering the heat from the high-temperature airflow and improving waste heat utilization efficiency. The combination of the coiled inductive heater and the metal rod utilizes the principle of inductive heating to effectively transfer heat into the tunnel kiln, enhancing the heating effect. The concave sealing box and convex sealing block design of the diversion structure ensures airtightness and prevents heat leakage. The preheating box and cooling box are connected by a heat-conducting connecting pipe, and the auxiliary guide fan promotes airflow circulation, further improving heat exchange efficiency. Temperature sensors inside the tunnel kiln monitor the temperature in real time, providing accurate data for regulation. The horn-shaped unidirectional plates installed in each pipe ensure unidirectional airflow, while the rotating fan enhances airflow turbulence and improves heat transfer efficiency. The overall device design is reasonable, with significant waste heat recovery effect, energy saving and consumption reduction, and high practical value. Attached Figure Description

[0018] Figure 1 This is a front sectional view of a waste heat recovery device for a tunnel kiln according to the present invention.

[0019] Figure 2 This is a top cross-sectional view of the waste heat recovery device for a tunnel kiln described in this utility model.

[0020] Figure 3 for Figure 1 A magnified view of the letter "A" in the image.

[0021] In the diagram: 1. Preheating box; 2. Cooling box; 3. Tunnel kiln; 4. Air filling pipe; 5. U-shaped airflow diversion pipe; 6. Diversion pump; 7. Coiled inductive heater; 8. Metal rod; 9. Long airflow return pipe; 10. Short airflow return pipe; 11. Toothed diversion pipe; 12. L-shaped circulation pipe; 13. Concave sealing box; 14. Convex sealing block; 15. Concave limiting block; 16. Concave rubber ring; 17. Sealing electric push rod. Detailed Implementation

[0022] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] Those skilled in the art should connect all electrical components and their compatible power supplies in this case via wires. Appropriate controllers and encoders should be selected according to the actual situation to meet control requirements. The specific connection and control sequence should refer to the working principle described below, where the electrical components are connected in sequence. The detailed connection methods are well-known in the art. The following mainly introduces the working principle and process, and will not describe the electrical control further. Example

[0024] The present invention will now be described in detail with reference to the accompanying drawings, such as... Figure 1-3As shown, the preheating box 1 and the cooling box 2 are respectively installed on both sides of the tunnel kiln 3. The air filling pipe 4 is inserted into the tunnel kiln 3 and the cooling box 2. The flow diversion structure and the airflow guiding structure are installed on the inner side of the tunnel kiln 3. The airflow guiding structure is connected to the preheating box 1 and the cooling box 2. The airflow guiding structure includes: several U-shaped airflow guiding pipes 5, a pair of guiding pumps 6, a coiled inductive heater 7, several metal rods 8, a long airflow return pipe 9, a short airflow return pipe 10, two pairs of toothed guiding pipes 11, a pair of circulating pumps, and a pair of L-shaped circulating pipes 12; the several U-shaped airflow guiding pipes 5 are divided into The long airflow return pipe 9 and the short airflow return pipe 10 are inserted into the tunnel kiln 3, and are connected to the preheating box 1. A pair of diversion pumps 6 are respectively connected to the long airflow return pipe 9 and the short airflow return pipe 10. Two pairs of toothed diversion pipes 11 are respectively inserted into the preheating box 1 and the cooling box 2. A pair of L-shaped circulation pipes 12 are respectively connected to the two pairs of toothed diversion pipes 11. A pair of circulation pumps are respectively installed on a pair of L-shaped circulation pipes 12. The air filling pipe 4 is inserted into the tunnel kiln 3. The metal rods 8 are evenly inserted into the air filling pipe 4, and the coiled inductive heater 7 is inserted into the air filling pipe 4; the diversion structure includes: a plurality of concave sealing boxes 13, a plurality of convex sealing blocks 14, a plurality of concave limiting blocks 15, a plurality of concave rubber rings 16, and a plurality of sealing electric push rods 17; the plurality of concave sealing boxes 13 are evenly inserted into the inner side of the tunnel kiln 3, the plurality of convex sealing blocks 14 are respectively movably inserted into the inner side of the plurality of concave sealing boxes 13, and the plurality of concave limiting blocks 15 are evenly installed in the inner side of the tunnel kiln 3, and the plurality of concave limiting blocks 15 are located in the plurality of concave sealing boxes 13. At the top of the concave sealing box 13, several concave rubber rings 16 are respectively installed inside several concave limiting blocks 15, and several sealing electric push rods 17 are respectively installed inside several concave sealing boxes 13; heat-conducting connecting pipes are provided on the preheating box 1 and the cooling box 2, and auxiliary air-guiding fans are provided inside the heat-conducting connecting pipes; several temperature sensors are provided inside the tunnel kiln 3; horn-shaped one-way plates are respectively provided inside the heat-conducting connecting pipes, several U-shaped airflow guiding pipes 5, long airflow return pipes 9 and short airflow return pipes 10; several rotating fans are provided inside the tunnel kiln 3.

[0025] According to the appendix Figure 1-3It is concluded that the gas is unidirectionally diverted through the gas filling pipe 4, thereby diverting the gas inside the cooling box 2 to the center of the inner side of the tunnel kiln 3. The inner side of the tunnel kiln 3 is divided and sealed by the diversion structure. Several U-shaped airflow diversion pipes 5 divert airflow into several sealed spaces. A pair of diversion pumps 6 cooperate with several U-shaped airflow diversion pipes 5 to divert the airflow along several sealed spaces in an S-shape, thereby diverting the high-temperature airflow into several sealed spaces one by one. This diverts the cooled gas to the inner side of the preheating box 1 and the cooling box 2. At the same time, the long airflow return pipe 9 and the short airflow return pipe 10 cooperate to divert the air inside the tunnel kiln 3 and the cooling box 2 to the inner side of the preheating box 1. The inductive heater 7 inductively heats several metal rods 8 inside the air filling pipe 4. Through inductive heating, the metal rods 8 generate high temperatures. The heat from the metal rods 8 is then diverted to the inside of the tunnel kiln 3 by flowing air. The high temperature generated by heating is then diverted by airflow, and the equipment inside the preheating box 1 provides auxiliary heating. The sealing electric push rods 17 inside several concave sealing boxes 13 extend and retract, respectively driving the convex sealing blocks 14 on them. This causes the convex sealing blocks 14 to move vertically and stably along the inside of several concave sealing boxes 13. The concave rubber rings 16 inside the concave limiting blocks 15 seal the concave sealing boxes 13 and the concave limiting blocks 15.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waste heat recovery device for a tunnel kiln, comprising: The system comprises a preheating box, a cooling box, a tunnel kiln, an air filling pipe, a flow distribution structure, and an airflow guiding structure. The preheating box and the cooling box are respectively installed on both sides of the tunnel kiln. The air filling pipe is inserted into the tunnel kiln and the cooling box. The flow distribution structure and the airflow guiding structure are installed on the inner side of the tunnel kiln. The airflow guiding structure is connected to the preheating box and the cooling box. The airflow guiding structure includes: a plurality of U-shaped airflow guiding pipes, a pair of guiding pumps, a coiled inductive heater, a plurality of metal rods, a long airflow return pipe, a short airflow return pipe, two pairs of toothed guiding pipes, a pair of circulating pumps, and a pair of L-shaped circulating pipes. Several U-shaped airflow guide pipes are respectively cross-installed on the tunnel kiln. The long airflow return pipe and the short airflow return pipe are inserted into the tunnel kiln and connected to the preheating box. A pair of guide pumps are respectively connected to the long airflow return pipe and the short airflow return pipe. Two pairs of toothed guide pipes are respectively inserted into the preheating box and the cooling box. A pair of L-shaped circulation pipes are respectively connected to the two pairs of toothed guide pipes. A pair of circulation pumps are respectively installed on the pair of L-shaped circulation pipes. The air filling pipe is inserted into the tunnel kiln. Several metal rods are evenly inserted into the air filling pipe. The coiled inductive heater is inserted into the air filling pipe.

2. The waste heat recovery device for a tunnel kiln according to claim 1, characterized in that, The diversion structure includes: several concave sealing boxes, several convex sealing blocks, several concave limiting blocks, several concave rubber rings, and several sealing electric push rods; A plurality of concave sealing boxes are evenly inserted into the inner side of the tunnel kiln, a plurality of convex sealing blocks are movably inserted into the inner side of the plurality of concave sealing boxes, a plurality of concave limiting blocks are evenly installed into the inner side of the tunnel kiln, and the plurality of concave limiting blocks are located at the top of the plurality of concave sealing boxes, a plurality of concave rubber rings are respectively installed into the inner side of the plurality of concave limiting blocks, and a plurality of sealing electric push rods are respectively installed into the inner side of the plurality of concave sealing boxes.

3. The waste heat recovery device for a tunnel kiln according to claim 2, characterized in that, The preheating box and the cooling box are equipped with heat-conducting connecting pipes, and an auxiliary air-guiding fan is installed on the inner side of the heat-conducting connecting pipes.

4. The waste heat recovery device for a tunnel kiln according to claim 3, characterized in that, Several temperature sensors are installed on the inside of the tunnel kiln.

5. A waste heat recovery device for a tunnel kiln according to claim 4, characterized in that, The inner sides of the heat-conducting connecting pipe, the plurality of U-shaped airflow guiding pipes, the long airflow return pipe, and the short airflow return pipe are respectively provided with horn-shaped unidirectional plates.

6. The waste heat recovery device for a tunnel kiln according to claim 5, characterized in that, Several rotating fans are installed on the inner side of the tunnel kiln.

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