Exhaust gas recycling device of tunnel type pyrolysis furnace

Abstract

The utility model provides a kind of waste gas recycling device of tunnel pyrolysis furnace, including combustion furnace, the side fixedly connected with waste gas inlet pipe of combustion furnace, the side of waste gas inlet pipe is provided with dilution pipe, waste gas inlet pipe is provided with fire retardant on, the side of combustion furnace is provided with combustion-supporting fan.The utility model has the advantages that: start gas pump to pump into heat exchange gas in heat exchange pipe, when hot gas flows in outlet pipe, the heat contained by it moves to the gas in heat exchange pipe through outlet pipe. After spiral outlet section, linear outlet section, the heat exchange between two gas streams is basically completed, and then harmless, heat exchange gas with heat is input into pyrolysis furnace through heat exchange pipe, to supplement the heat of pyrolysis furnace. The separation pipe is connected with external waste gas treatment device, and the gas generated by combustion is input into waste gas treatment device for treatment. The heat contained by pyrolysis waste gas is finally returned to pyrolysis furnace, reduces the internal consumption of production, energy saving and emission reduction.

Description

Technical Field

[0001] This utility model relates to the field of tunnel pyrolysis furnace technology, and in particular to a waste gas recycling device for tunnel pyrolysis furnace. Background Technology

[0002] A tunnel pyrolysis furnace is a continuous, long, channel-shaped pyrolysis reaction device. It is mainly used to heat and decompose organic solid waste in an oxygen-deficient or oxygen-free environment, transforming it into high-value-added products. Its name comes from its tunnel-like long straight furnace structure and working method.

[0003] When a tunnel pyrolysis furnace is operating, heating components are used to heat its interior to pyrolyze the target material. Pyrolysis generates waste gas, which is both polluting and contains heat. In existing technologies, this waste gas is typically purified before being released. However, the heat contained in the waste gas is also released, resulting in energy waste. Therefore, this paper proposes an improved waste gas recycling device for tunnel pyrolysis furnaces. Utility Model Content

[0004] The purpose of this invention is to at least solve one of the aforementioned technical defects.

[0005] Therefore, one objective of this utility model is to propose a waste gas recycling device for a tunnel pyrolysis furnace to solve the problems mentioned in the background art and overcome the shortcomings of the existing technology.

[0006] To achieve the above objectives, one embodiment of this utility model provides a waste gas recycling device for a tunnel-type pyrolysis furnace, comprising a combustion furnace, a waste gas inlet pipe fixedly connected to one side of the combustion furnace, a dilution pipe provided on one side of the waste gas inlet pipe, a flame retardant provided on the waste gas inlet pipe, a combustion-supporting fan provided on one side of the combustion furnace, and a burner provided on one side of the combustion furnace; a heat exchange box fixedly connected to the top of the combustion furnace, an outlet pipe extending into the heat exchange box fixedly connected to the top of the combustion furnace, a heat exchange tube fixedly connected to the heat exchange box, an air pump for pumping air into the heat exchange tube provided on the heat exchange box, a spiral outlet section and a straight outlet section provided on the outlet pipe, a spiral heat exchange section and a straight heat exchange section provided on the heat exchange tube, the spiral heat exchange section and the straight heat exchange section respectively sleeved on the outside of the spiral outlet section and the straight outlet section, and a separation pipe fixedly connected to the end of the straight outlet section.

[0007] Preferably, as described in any of the above schemes, the ends of the exhaust gas inlet pipe, the linear heat exchange section, and the separation pipe are all equipped with flanges.

[0008] The above technical solution utilizes a combustion furnace to provide space for waste gas treatment. During the pyrolysis process in the pyrolysis furnace, some materials, such as EVA and plastics, vaporize and are discharged along with the waste gas generated during pyrolysis. A waste gas inlet pipe is installed on one side of the pyrolysis furnace to connect to external pipelines, transporting the pyrolysis waste gas generated in the pyrolysis furnace to the combustion furnace. Flanges are installed at the ends of the waste gas inlet pipe, the linear heat exchange section, and the separation pipe to facilitate connection to relevant pipelines or equipment.

[0009] Preferably, of any of the above embodiments, a control valve is provided on the exhaust gas inlet pipe, and the combustion fan and the exhaust gas inlet pipe are located on the same side of the combustion furnace.

[0010] The above technical solution employs the following: a control valve is installed on the exhaust gas inlet pipe, allowing for free control of its opening and closing. A dilution pipe can be connected to a pumping device to pump dilution gas into the exhaust gas inlet pipe, diluting the pyrolysis exhaust gas. A flame retardant is installed on the exhaust gas inlet pipe to prevent combustion of the pyrolysis exhaust gas within the pipe. A combustion-supporting fan is used to inject combustion-supporting gas into the combustion furnace, assisting in the combustion of the pyrolysis exhaust gas.

[0011] Preferably, in any of the above embodiments, the burner is located on the side of the combustion furnace opposite to the exhaust gas inlet pipe, and the exhaust pipe is located in the middle of the top of the combustion furnace.

[0012] The above technical solution employs a burner to ignite the pyrolysis waste gas. After connecting the waste gas inlet pipe to the pyrolysis furnace outlet pipe, the pyrolysis waste gas enters the combustion furnace through the waste gas inlet pipe, the burner is started for ignition, and the combustion-supporting fan is used to inject combustion-supporting gas into the combustion furnace, where the pyrolysis waste gas is combusted.

[0013] Preferably, in any of the above schemes, the end of the gas outlet pipe located inside the combustion furnace is fixedly connected to a gas-gathering hopper, and the heat exchange box adopts a cylindrical structure.

[0014] The above technical solution involves burning off some of the pollutants in the pyrolysis waste gas during combustion, reducing the workload of subsequent waste gas treatment equipment. The exhaust pipe discharges the hot gas generated during combustion. A gas-collecting hopper is installed at the bottom of the exhaust pipe to collect the hot gas, allowing it to quickly enter the exhaust pipe.

[0015] Preferably, in any of the above schemes, both the spiral air outlet section and the spiral heat exchange section adopt a vortex structure, and both the spiral air outlet section and the spiral heat exchange section are located inside the heat exchange box.

[0016] The above technical solution involves connecting the end of the gas outlet pipe to the pyrolysis furnace, starting the gas pump to pump heat exchange gas into the heat exchange tubes, and transferring the heat contained in the hot gas as it flows through the outlet pipe into the heat exchange tubes. After passing through the spiral outlet section and the straight outlet section, the heat exchange between the two gases is largely completed. Then, the harmless, heat-containing heat exchange gas is introduced into the pyrolysis furnace through the heat exchange tubes to supplement the furnace with heat.

[0017] Preferably, in any of the above embodiments, the outlet pipe is made of metal, and the separation pipe is arranged in a straight heat exchange section perpendicular to the heat exchange pipe.

[0018] The above technical solution employs the following: the exhaust pipe is made of metal, which generally has a high thermal conductivity, facilitating heat transfer. The separator pipe is used to discharge the combustion gases; during use, it is connected to an external waste gas treatment device, which then processes the combustion gases.

[0019] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows:

[0020] 1. This tunnel-type pyrolysis furnace waste gas recycling device comprises a combustion furnace, waste gas inlet pipe, burner, heat exchange box, heat exchange tubes, and outlet pipe. During operation, after connecting the waste gas inlet pipe to the pyrolysis furnace outlet pipe, the pyrolysis waste gas enters the combustion furnace through the inlet pipe. The burner is then ignited, and a combustion fan injects combustion-supporting gas into the furnace, where the pyrolysis waste gas is combusted. The outlet pipe is then connected to the pyrolysis furnace, and a gas pump is activated to pump heat exchange gas into the heat exchange tubes. As the hot gas flows through the outlet pipe, its heat content moves through the outlet pipe towards the gas inside the heat exchange tubes. After passing through a spiral outlet section and a straight outlet section, the heat exchange between the two gases is largely completed. The harmless, heat-containing heat exchange gas is then input into the pyrolysis furnace through the heat exchange tubes to supplement the furnace's heat supply. Finally, a separation pipe is connected to an external waste gas treatment device, which processes the combustion-generated gas. The heat contained in the pyrolysis waste gas is eventually returned to the pyrolysis furnace, reducing internal consumption in production and saving energy and reducing emissions.

[0021] 2. The waste gas recycling device of this tunnel-type pyrolysis furnace is equipped with a control valve on the waste gas inlet pipe, which can freely control the opening and closing of the waste gas inlet pipe. A dilution pipe can be connected to a gas pumping device to pump dilution gas into the waste gas inlet pipe to dilute the pyrolysis waste gas. A flame retardant is installed on the waste gas inlet pipe to prevent the pyrolysis waste gas from burning within the pipe. A combustion-supporting fan is used to inject combustion-supporting gas into the combustion furnace to assist the combustion of the pyrolysis waste gas.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0024] Figure 1 This is a first-view structural diagram of the present invention;

[0025] Figure 2 This is a schematic diagram of the second-view structure of the present invention;

[0026] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the air outlet pipe and heat exchange pipe of this utility model.

[0028] In the diagram: 1-combustion furnace, 2-exhaust gas inlet pipe, 3-dilution pipe, 4-flame retardant, 5-combustion fan, 6-burner, 7-heat exchange box, 8-exhaust pipe, 9-heat exchange tube, 10-air pump, 11-spiral exhaust section, 12-spiral heat exchange section, 13-straight exhaust section, 14-straight heat exchange section, 15-separation pipe. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] like Figures 1-4As shown, this utility model includes a combustion furnace 1, a waste gas inlet pipe 2 fixedly connected to one side of the combustion furnace 1, a dilution pipe 3 provided on one side of the waste gas inlet pipe 2, a flame retardant 4 provided on the waste gas inlet pipe 2, a combustion-supporting fan 5 provided on one side of the combustion furnace 1, and a burner 6 provided on one side of the combustion furnace 1; a heat exchange box 7 fixedly connected to the top of the combustion furnace 1, an outlet pipe 8 extending into the heat exchange box 7 fixedly connected to the top of the combustion furnace 1, a heat exchange tube 9 fixedly connected to the heat exchange box 7, an air pump 10 that can pump air to the heat exchange tube 9 provided on the heat exchange box 7, a spiral outlet section 11 and a straight outlet section 13 provided on the outlet pipe 8, a spiral heat exchange section 12 and a straight heat exchange section 14 provided on the heat exchange tube 9, the spiral heat exchange section 12 and the straight heat exchange section 14 respectively sleeved on the outside of the spiral outlet section 11 and the straight outlet section 13, and a separation pipe 15 fixedly connected to the end of the straight outlet section 13.

[0032] Example 1: Flanges are installed at the ends of the exhaust gas inlet pipe 2, the linear heat exchange section 14, and the separation pipe 15. The combustion furnace 1 provides space for exhaust gas treatment. During the pyrolysis process in the pyrolysis furnace, some materials, such as EVA and plastics, will vaporize and be discharged with the exhaust gas generated by pyrolysis. An exhaust gas inlet pipe 2 is installed on one side of the pyrolysis furnace 1 to connect to external pipelines and transport the pyrolysis exhaust gas generated by the pyrolysis furnace to the combustion furnace 1. Flanges are installed at the ends of the exhaust gas inlet pipe 2, the linear heat exchange section 14, and the separation pipe 15 to facilitate their connection to relevant pipelines or equipment. A control valve is installed on the exhaust gas inlet pipe 2, and the combustion fan 5 is located on the same side of the combustion furnace 1 as the exhaust gas inlet pipe 2. The control valve on the exhaust gas inlet pipe 2 can freely control the opening and closing of the exhaust gas inlet pipe 2. The dilution pipe 3 can be connected to a pumping device to pump dilution gas into the exhaust gas inlet pipe 2 to dilute the pyrolysis exhaust gas. A flame retardant 4 is installed on the exhaust gas inlet pipe 2 to prevent the pyrolysis exhaust gas from burning inside the exhaust gas inlet pipe 2. The combustion fan 5 is used to inject combustion-supporting gas into the combustion furnace 1 to assist the combustion of the pyrolysis exhaust gas.

[0033] Example 2: Burner 6 is located on the side of the combustion furnace 1 opposite to the exhaust gas inlet pipe 2, and exhaust pipe 8 is located in the middle of the top of the combustion furnace 1. Burner 6 is used to ignite the pyrolysis exhaust gas. After connecting the exhaust gas inlet pipe 2 to the pyrolysis furnace exhaust pipe, the pyrolysis exhaust gas enters the combustion furnace 1 through the exhaust gas inlet pipe 2, and burner 6 is started for ignition. Combustion fan 5 is used to inject combustion-supporting gas into the combustion furnace 1, and the pyrolysis exhaust gas is combusted. A gas-collecting hopper is fixedly connected to one end of the exhaust pipe 8 inside the combustion furnace 1, and the heat exchange box 7 adopts a cylindrical structure. During the combustion of the pyrolysis exhaust gas, some of the related pollutants are burned off, which can reduce the working pressure of subsequent exhaust gas treatment equipment. The exhaust pipe 8 discharges the hot gas generated by combustion. A gas-collecting hopper is set at the bottom of the exhaust pipe 8 to collect the hot gas so that the hot gas can quickly enter the exhaust pipe 8.

[0034] Example 3: Both the spiral outlet section 11 and the spiral heat exchange section 12 adopt a vortex structure and are located within the heat exchange box 7. The end of the outlet pipe 8 is connected to the pyrolysis furnace. The gas pump 10 is started to pump heat exchange gas into the heat exchange tube 9. When the hot gas flows in the outlet pipe 8, the heat it contains moves through the outlet pipe 8 to the gas in the heat exchange tube 9. After passing through the spiral outlet section 11 and the straight outlet section 13, the heat exchange between the two gases is largely completed. Then, the harmless, heat-containing heat exchange gas is input into the pyrolysis furnace through the heat exchange tube 9 to supplement the heat of the pyrolysis furnace. The outlet pipe 8 is made of metal, and the separation pipe 15 is set perpendicular to the straight heat exchange section 14 of the heat exchange tube 9. The outlet pipe 8 is made of metal, which generally has a high thermal conductivity, facilitating heat transfer. The separator 15 is used to discharge the combustion-generated gases. In use, it is connected to an external exhaust gas treatment device to input the combustion-generated gases into the exhaust gas treatment device for treatment.

[0035] The working principle of this utility model is as follows:

[0036] S1. Connect the exhaust gas inlet pipe 2 to the pyrolysis furnace outlet pipe, connect the end of the outlet pipe 8 to the pyrolysis furnace, and connect the separation pipe 15 to the external exhaust gas treatment device.

[0037] S2. Pyrolysis waste gas enters combustion furnace 1 through waste gas inlet pipe 2. Burner 6 is started for ignition. Combustion fan 5 is used to inject combustion gas into combustion furnace 1, and the pyrolysis waste gas is combusted. Gas pump 10 is started to pump heat exchange gas into heat exchange tube 9. When the hot gas flows in outlet pipe 8, the heat it contains moves through outlet pipe 8 to the gas in heat exchange tube 9. After passing through spiral outlet section 11 and straight outlet section 13, the heat exchange between the two gases is basically completed. Then, the harmless heat exchange gas with heat is input into the pyrolysis furnace through heat exchange tube 9 to supplement the heat of the pyrolysis furnace.

[0038] S3. The gas produced by combustion is fed into the waste gas treatment device for treatment through the gas outlet pipe 8 and the exhaust pipe 15.

[0039] Compared with the prior art, the present invention has the following advantages:

[0040] 1. The waste gas recycling device for this tunnel-type pyrolysis furnace comprises a combustion furnace 1, a waste gas inlet pipe 2, a burner 6, a heat exchange box 7, heat exchange tubes 9, and an outlet pipe 8. During operation, after connecting the waste gas inlet pipe 2 to the pyrolysis furnace outlet pipe, the pyrolysis waste gas enters the combustion furnace 1 through the waste gas inlet pipe 2. The burner 6 is then ignited, and the combustion fan 5 injects combustion-supporting gas into the combustion furnace 1, where the pyrolysis waste gas is combusted. The end of the outlet pipe 8 is connected to the pyrolysis furnace, and the gas pump 10 is activated to pump heat exchange gas into the heat exchange tubes 9. As the hot gas flows through the outlet pipe 8, its heat content moves through the outlet pipe 8 into the gas within the heat exchange tubes 9. After passing through the spiral outlet section 11 and the straight outlet section 13, the heat exchange between the two gases is largely completed. Then, the harmless, heat-containing heat exchange gas is input into the pyrolysis furnace through the heat exchange tubes 9 to replenish the furnace's heat. The separator 15 is connected to an external waste gas treatment device, and the gas produced by combustion is fed into the waste gas treatment device for processing. The heat contained in the pyrolysis waste gas is ultimately returned to the pyrolysis furnace, reducing internal consumption in production and achieving energy conservation and emission reduction.

[0041] 2. The waste gas recycling device of this tunnel-type pyrolysis furnace is equipped with a control valve on the waste gas inlet pipe 2, which can freely control the opening and closing of the waste gas inlet pipe 2. The dilution pipe 3 can be connected to a gas pumping device to pump dilution gas into the waste gas inlet pipe 2 to dilute the pyrolysis waste gas. A flame retardant 4 is installed on the waste gas inlet pipe 2 to prevent the pyrolysis waste gas from burning inside the waste gas inlet pipe 2. The combustion fan 5 is used to inject combustion-supporting gas into the combustion furnace 1 to assist the combustion of the pyrolysis waste gas.

Claims

1. A waste gas recycling device for a tunnel pyrolysis furnace, comprising a combustion furnace; characterized in that, A waste gas inlet pipe is fixedly connected to one side of the combustion furnace, a dilution pipe is provided on one side of the waste gas inlet pipe, a flame retardant is provided on the waste gas inlet pipe, a combustion-supporting fan is provided on one side of the combustion furnace, and a burner is provided on one side of the combustion furnace. A heat exchange box is fixedly connected to the top of the combustion furnace, and an exhaust pipe extending into the heat exchange box is fixedly connected to the top of the combustion furnace. A heat exchange tube is fixedly connected to the heat exchange box, and an air pump capable of pumping air into the heat exchange tube is installed on the heat exchange box. A spiral exhaust section and a straight exhaust section are provided on the exhaust pipe, and a spiral heat exchange section and a straight heat exchange section are provided on the heat exchange tube. The spiral heat exchange section and the straight heat exchange section are respectively sleeved on the outside of the spiral exhaust section and the straight exhaust section. A separation pipe is fixedly connected to the end of the straight exhaust section.

2. The waste gas recycling device for a tunnel pyrolysis furnace as described in claim 1, characterized in that: Flanges are provided at the ends of the exhaust gas inlet pipe, the linear heat exchange section, and the separation pipe.

3. The waste gas recycling device for a tunnel pyrolysis furnace as described in claim 2, characterized in that: A control valve is installed on the exhaust gas inlet pipe, and the combustion fan and the exhaust gas inlet pipe are located on the same side of the combustion furnace.

4. The waste gas recycling device for a tunnel pyrolysis furnace as described in claim 3, characterized in that: The burner is located on the side of the combustion furnace opposite to the exhaust gas inlet pipe, and the exhaust gas outlet pipe is located in the middle of the top of the combustion furnace.

5. The waste gas recycling device for a tunnel pyrolysis furnace as described in claim 4, characterized in that: The gas outlet pipe is fixedly connected to a gas-gathering hopper at one end inside the combustion furnace, and the heat exchange box adopts a cylindrical structure.

6. The waste gas recycling device for a tunnel pyrolysis furnace as described in claim 5, characterized in that: Both the spiral air outlet section and the spiral heat exchange section adopt a vortex structure, and both the spiral air outlet section and the spiral heat exchange section are located inside the heat exchange box.

7. The waste gas recycling device for a tunnel pyrolysis furnace as described in claim 6, characterized in that: The outlet pipe is made of metal, and the separation pipe is set with a straight heat exchange section perpendicular to the heat exchange pipe.

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