An indirect cracking furnace heating system based on heat conducting oil

Abstract

The utility model discloses an indirect type cracking furnace heating system based on heat conducting oil, including first spiral heating pipe and second spiral heating pipe. Advantageous effect: the utility model has adopted first spiral heating pipe, second spiral heating pipe and electromagnetic heating coil, and first oil pump pumps the circulation flow of heat conducting oil in first spiral heating pipe and second spiral heating pipe, when heat conducting oil flows through second spiral heating pipe, electromagnetic drive mechanism drives electromagnetic heating coil to heat second spiral heating pipe, heats heat conducting oil through heat conduction, and then completes the temperature rise of heat conducting oil, and second spiral heating pipe prolongs the heating path of heat conducting oil, and then improves heating efficiency, relative to traditional torch heating type cracking furnace, the device avoids open fire, reduces the flue gas production, relative to traditional resistance wire heating type cracking furnace, reduces the problem of complex resistance wire wiring and large power consumption, and the structure is simpler, and the use is more convenient.

Description

Technical Field

[0001] This utility model relates to the field of waste rubber recycling technology, specifically to an indirect pyrolysis furnace heating system based on heat transfer oil. Background Technology

[0002] When recycling waste rubber through pyrolysis, a pyrolysis furnace is usually used. A pyrolysis furnace is a device used to pyrolyze hydrocarbons. Waste rubber is put into the pyrolysis furnace and pyrolyzed by vacuum heating.

[0003] After searching, it was found that application number CN202411571662.4, entitled "An Electrocracking Furnace System and an Operating Method for an Electrocracking Furnace System", uses electric heating and flare heating to generate steam for pyrolysis. Although it achieves the purpose of carbon reduction, a large amount of flue gas is generated when the flare module is heated, which requires post-treatment. The electric heating uses electric heating elements, such as resistance wires and electric heating tubes, which require the installation of multiple sets of heating elements to achieve stable and uniform heating. The installation and wiring are very complicated, the power consumption is also large, the operating power is too high, and the structure is complicated. Further improvements can be made.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides an indirect pyrolysis furnace heating system based on heat transfer oil, which has the advantages of simple structure, uniform heating, and low flue gas emissions, thereby solving the problems mentioned in the background technology.

[0006] To achieve the advantages of simple structure, uniform heating, and low flue gas emissions, the specific technical solution adopted by this utility model is as follows: A heating system for an indirect pyrolysis furnace based on heat transfer oil includes a first spiral heating tube and a second spiral heating tube. One end of the first spiral heating tube is connected to one end of the second spiral heating tube through a return pipe, and the other end of the second spiral heating tube is connected to the other end of the first spiral heating tube through a pumping pipe. The first spiral heating tube is installed on the inner wall surface of the pyrolysis furnace. An electromagnetic heating coil is sleeved on the outside of the second spiral heating tube, and an electromagnetic drive mechanism is connected to the input end of the electromagnetic heating coil. The pumping pipe is connected to a first oil pump.

[0007] Furthermore, the output and input ends of the first oil pump are respectively connected to the output and input ends of the pumping pipe.

[0008] Furthermore, the first spiral heating tube and the second spiral heating tube have the same diameter, and the outer surface of the first spiral heating tube is polished and treated with anti-corrosion coating.

[0009] Furthermore, a pressure relief valve is installed on the surface of the return pipe, and an outer casing is fixedly sleeved on the outer wall of the return pipe outside the pressure relief valve. A temporary storage box is connected to the bottom of the outer casing through an inlet pipe. A second oil pump is connected to the bottom of the temporary storage box through an outlet pipe, and the output end of the second oil pump is connected to the return pipe through a connecting pipe.

[0010] Furthermore, a one-way valve is installed on the surface of the connecting pipe, and the installation direction of the one-way valve is the same as the pumping direction of the second oil pump.

[0011] Furthermore, the volume of the temporary storage tank is greater than the thermal expansion volume of the heat transfer oil.

[0012] Furthermore, the second spiral heating tube is installed on the outside of the pyrolysis furnace.

[0013] Furthermore, both the first and second spiral heating tubes are made of copper.

[0014] Compared with the prior art, this utility model provides an indirect pyrolysis furnace heating system based on heat transfer oil, which has the following beneficial effects: (1) This utility model adopts a first spiral heating tube, a second spiral heating tube and an electromagnetic heating coil. The first spiral heating tube is installed on the inner wall surface of the pyrolysis furnace. The spiral pipe structure increases the movement path of the heat transfer oil, thereby improving the uniformity and comprehensiveness of heating. The second spiral heating tube is connected to the first spiral heating tube. The first oil pump pumps the heat transfer oil to circulate in the first and second spiral heating tubes. When the heat transfer oil flows through the second spiral heating tube, the electromagnetic drive mechanism drives the electromagnetic heating coil to heat the second spiral heating tube. The heat transfer oil is heated by heat conduction, thereby completing the temperature rise of the heat transfer oil. The second spiral heating tube extends the heating path of the heat transfer oil, thereby improving the heating efficiency. Compared with the traditional torch-heated pyrolysis furnace, this device avoids open flame and reduces the generation of flue gas. Compared with the traditional resistance wire-heated pyrolysis furnace, it reduces the problems of complex resistance wire wiring and high power consumption. The structure is simpler and easier to use.

[0015] (2) This utility model adopts a temporary storage box and a pressure relief valve. As the temperature of the heat transfer oil continues to rise, the oil pressure in the first spiral heating tube and the second spiral heating tube gradually increases, eventually increasing to the point of exceeding the pressure limit of the pressure relief valve. The hot oil can then be sprayed out of the pressure relief valve and enter the outer casing, and then enter the temporary storage box through the discharge pipe for storage. This avoids the problem of pipe rupture caused by excessive pressure, ensuring safe use. At the same time, the second oil pump can pump the heat transfer oil in the temporary storage box back into the first spiral heating tube and the second spiral heating tube after the heat transfer oil cools down, avoiding waste. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of an indirect pyrolysis furnace heating system based on heat transfer oil proposed in this utility model; Figure 2 This is a front view of an indirect pyrolysis furnace heating system based on heat transfer oil proposed in this utility model; Figure 3 This is an enlarged view of node A of an indirect pyrolysis furnace heating system based on heat transfer oil proposed in this utility model; Figure 4 This is an installation diagram of the outer casing and temporary storage box proposed in this utility model.

[0018] In the picture: 1. First spiral heating tube; 2. Return pipe; 3. Second spiral heating tube; 4. Pumping pipe; 5. First oil pump; 6. Electromagnetic heating coil; 7. Electromagnetic drive mechanism; 8. Temporary storage box; 9. Second oil pump; 10. Pressure relief valve; 11. Inlet pipe; 12. Outlet pipe; 13. Connecting pipe; 14. Check valve; 15. Outer casing. Detailed Implementation

[0019] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0020] According to an embodiment of the present invention, an indirect pyrolysis furnace heating system based on heat transfer oil is provided.

[0021] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. Please refer to them. Figure 1 and Figure 2According to an embodiment of the present invention, an indirect pyrolysis furnace heating system based on heat transfer oil includes a first spiral heating tube 1 and a second spiral heating tube 3. Both the first spiral heating tube 1 and the second spiral heating tube 3 are hollow metal tubes with a spiral structure design. One end of the first spiral heating tube 1 is connected to a return pipe 2 via a flange, and the other end of the return pipe 2 is connected to one end of the second spiral heating tube 3 via a flange, forming a closed circulation path for the heat transfer oil. The other end of the second spiral heating tube 3 is connected to a pumping pipe 4 via a flange, and the other end of the pumping pipe 4 is connected to the other end of the first spiral heating tube 1 via a flange, ensuring that the heat transfer oil can circulate within the pipe. The first spiral heating tube 1 is fixedly installed on the inner wall surface of the pyrolysis furnace by a bracket. Its spiral structure can fit tightly against the furnace wall, increasing the contact area with the furnace space, facilitating uniform heating of the material inside the furnace through heat conduction, and promoting the pyrolysis reaction. An electromagnetic heating coil 6 is sleeved on the outside of the second spiral heating tube 3 by a high-temperature resistant bracket. The electromagnetic heating coil 6 is a multi-turn copper coil, and its input end is connected to an electromagnetic drive mechanism 7 via a wire. The electromagnetic drive mechanism 7 can generate a high-frequency alternating magnetic field, causing the electromagnetic heating coil 6 to work and generate heat, which is a common electromagnetic heating structure. A first oil pump 5 is connected to the middle of the pumping pipe 4 via a flange. The output end and input end of the first oil pump 5 are respectively connected to the two sections of the pumping pipe 4. The first oil pump 5 is a high-temperature resistant oil pump, which can meet the transportation requirements of high-temperature heat transfer oil and provide power for the circulation of heat transfer oil in the first spiral heating pipe 1 and the second spiral heating pipe 3. The spiral pipe structure of the first spiral heating tube 1 significantly increases the movement path of the heat transfer oil within the pyrolysis furnace, allowing the oil to fully release heat and thus improving the uniformity and comprehensiveness of heating the materials inside the furnace. During operation, the first oil pump 5 starts, pumping the heat transfer oil along the pumping pipe 4 into the first spiral heating tube 1. The oil releases heat during its flow within the first spiral heating tube 1, heating the materials inside the pyrolysis furnace. Subsequently, the heat transfer oil flows into the second spiral heating tube 3 via the return pipe 2. At this time, the electromagnetic drive mechanism 7 starts, driving the electromagnetic heating coil 6 to generate a high-frequency magnetic field. The second spiral heating tube 3 heats itself under the influence of the magnetic field, heating the heat transfer oil inside the tube through heat conduction, thus completing the temperature rise of the heat transfer oil. The spiral structure of the second spiral heating tube 3 also extends the heating path of the heat transfer oil, allowing the oil to fully absorb heat and improve heating efficiency. Compared to traditional flare-heated pyrolysis furnaces, this device indirectly heats the pyrolysis furnace by electromagnetically heating the heat transfer oil, avoiding open flame use, reducing combustion emissions, and making it more environmentally friendly. Compared to traditional resistance wire-heated pyrolysis furnaces, it eliminates the need for complex resistance wire wiring, reducing excessive power consumption, and making the overall structure simpler and easier to install and use. Please refer to Figure 1 and Figure 2The first spiral heating tube 1 and the second spiral heating tube 3 have the same diameter, ensuring a stable flow rate of the heat transfer oil during circulation and avoiding local pressure fluctuations or uneven flow caused by differences in tube diameter. Furthermore, the outer surface of the first spiral heating tube 1 undergoes fine polishing and anti-corrosion treatment. Polishing makes the surface smooth, reducing the adhesion of dust and pyrolysis residues; anti-corrosion treatment resists the erosion of corrosive gases or substances inside the furnace, extending the service life of the pipe and facilitating regular cleaning and maintenance by staff, thus reducing maintenance costs. Please refer to Figure 3 and Figure 4 A pressure relief valve 10 is threadedly installed in the middle of the return pipe 2. The pressure relief valve 10 is a spring-loaded safety valve, and its opening pressure is preset to the upper limit of the system's safe pressure. When the pressure in the pipeline exceeds the preset value, it automatically opens to relieve pressure. An outer casing 15 is welded and fixed to the outer wall of the return pipe 2 on the outside of the pressure relief valve 10. The outer casing 15 is a sealed metal box that can completely enclose the heat transfer oil sprayed from the pressure relief valve 10, preventing high-temperature heat transfer oil from splashing and causing injury, thus improving safety during use. The bottom surface of the outer casing 15 is connected to the inlet pipe 11 through a flange. The other end of the inlet pipe 11 is connected to the top surface of the temporary storage box 8 through a flange. The temporary storage box 8 is a sealed metal container used to temporarily store the heat transfer oil discharged after pressure relief. The bottom surface of the temporary storage box 8 is connected to the outlet pipe 12 through a flange. The other end of the outlet pipe 12 is connected to the input end of the second oil pump 9 through a flange. The output end of the second oil pump 9 is connected to the connecting pipe 13 through a flange. The other end of the connecting pipe 13 is connected to the end of the return pipe 2 near the first spiral heating pipe 1 through a flange. As the temperature of the heat transfer oil continues to rise, its volume expands, causing the oil pressure in the first spiral heating tube 1 and the second spiral heating tube 3 to gradually increase. When the pressure increases to the point of exceeding the pressure limit of the pressure relief valve 10, the pressure relief valve 10 automatically opens, and the high-temperature heat transfer oil is sprayed out of the pressure relief valve 10 and into the outer casing 15. Subsequently, it flows along the discharge pipe 11 into the temporary storage tank 8 for storage, effectively avoiding the risk of rupture due to excessive pressure in the pipeline, ensuring safe and reliable use. When the system temperature decreases and the pressure stabilizes, the second oil pump 9 starts, pumping the heat transfer oil stored in the temporary storage tank 8 back into the circulation system through the discharge pipe 12, connecting pipe 13, and return pipe 2, avoiding waste of heat transfer oil and improving resource utilization. Please refer to Figure 3 and Figure 4 A one-way valve 14 is threadedly installed on the surface of the connecting pipe 13. The installation direction of the one-way valve 14 is the same as the pumping direction of the second oil pump 9, that is, it only allows the heat transfer oil to flow from the second oil pump 9 to the return pipe 2, while preventing the heat transfer oil in the return pipe 2 from flowing back into the connecting pipe 13 and the temporary storage tank 8. This ensures that the heat transfer oil stored in the temporary storage tank 8 will not be forced back by the high pressure in the system, and at the same time, it prevents the heat transfer oil from being diverted into the temporary storage tank 8 during normal system circulation, thus ensuring the stability of the circulation system. Please refer to Figure 3 and Figure 4 The volume of the temporary storage tank 8 is precisely calculated to be greater than the thermal expansion volume of the heat transfer oil at the highest operating temperature of the system. This ensures that even if the heat transfer oil in the system completely expands and overflows due to high temperature, it can be completely contained by the temporary storage tank 8, preventing damage caused by excessive internal pressure. This further improves the safety performance of the system. Please refer to Figure 1 and Figure 2 The second spiral heating tube 3 is fixedly installed on the outside of the pyrolysis furnace by a bracket, away from the high temperature and corrosive environment inside the furnace. This not only makes it convenient for staff to install, inspect and maintain the electromagnetic heating coil 6 and the second spiral heating tube 3, but also avoids the corrosion of the heating components by the furnace environment, thus extending the service life of the equipment. Please refer to Figure 1 and Figure 2 Both the first spiral heating tube 1 and the second spiral heating tube 3 are made of copper tubes. Copper tubes have excellent thermal conductivity and can quickly transfer heat. When the heat transfer oil in the first spiral heating tube 1 releases heat, the copper tube can quickly transfer the heat to the material in the pyrolysis furnace. When the second spiral heating tube 3 is electromagnetically heated, the copper tube can also quickly absorb heat and transfer it to the heat transfer oil in the tube, which greatly improves the heat transfer efficiency and ensures that the heating system can efficiently provide heat to the pyrolysis furnace. Working principle: Before starting the system, check whether all pipe connections are sealed, whether the pressure relief valve 10 is normal, and whether the temporary storage tank 8 is empty. Then, inject sufficient heat transfer oil into the first spiral heating tube 1, the second spiral heating tube 3, and the connecting pipes, close all valves, and start the first oil pump 5 and the electromagnetic drive mechanism 7. The first oil pump 5 operates, driving the heat transfer oil along the pumping pipe 4 into the first spiral heating pipe 1. When the heat transfer oil flows in the first spiral heating pipe 1, it transfers heat to the inner wall of the cracking furnace through the thermal conduction of the copper pipe, thereby heating the material in the furnace and promoting the cracking reaction. After releasing heat, the heat transfer oil flows into the second spiral heating pipe 3 through the return pipe 2. At the same time, the electromagnetic drive mechanism 7 drives the electromagnetic heating coil 6 to generate a high-frequency alternating magnetic field. The second spiral heating tube 3 generates eddy currents and heats up under the action of the magnetic field. The heat is transferred to the heat transfer oil in the tube through the copper tube, which raises the temperature of the heat transfer oil. The heated heat transfer oil is then sent back to the first spiral heating tube 1 by the first oil pump 5 through the pumping pipe 4, completing the circulating heating process of the heat transfer oil. As the system continues to operate, the temperature of the heat transfer oil rises continuously, and the volume expansion causes the pressure inside the pipeline to gradually increase. When the pressure exceeds the preset pressure of the pressure relief valve 10, the pressure relief valve 10 automatically opens, and the high-temperature heat transfer oil is sprayed into the outer casing 15, and then flows into the temporary storage tank 8 through the discharge pipe 11 for storage, to prevent the pipeline from rupturing. When the pyrolysis operation is completed or the machine needs to be shut down, first turn off the electromagnetic drive mechanism 7. After the temperature of the heat transfer oil drops to a safe range, turn off the first oil pump 5. Then start the second oil pump 9 to pump the heat transfer oil in the temporary storage tank 8 back into the circulation pipeline through the discharge pipe 12, connecting pipe 13, pump and return pipe 2, thus completing the heat transfer oil recovery. This indirect pyrolysis furnace heating system based on thermal oil achieves indirect heating by electromagnetically heating the thermal oil. It is flameless, pollution-free, and has a simple structure that is easy to maintain. It is also equipped with a complete pressure relief and recovery mechanism, which is safe, reliable, and avoids resource waste. It is suitable for the heating needs of various pyrolysis furnaces.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A heating system for an indirect pyrolysis furnace based on heat transfer oil, characterized in that, It includes a first spiral heating tube (1) and a second spiral heating tube (3). One end of the first spiral heating tube (1) is connected to one end of the second spiral heating tube (3) through a return pipe (2), and the other end of the second spiral heating tube (3) is connected to the other end of the first spiral heating tube (1) through a pumping pipe (4). The first spiral heating tube (1) is installed on the inner wall surface of the cracking furnace. An electromagnetic heating coil (6) is sleeved on the outside of the second spiral heating tube (3), and an electromagnetic drive mechanism (7) is connected to the input end of the electromagnetic heating coil (6). The pumping pipe (4) is connected to the first oil pump (5).

2. The indirect pyrolysis furnace heating system based on heat transfer oil according to claim 1, characterized in that, The output and input ends of the first oil pump (5) are respectively connected to the output and input ends of the pumping pipe (4).

3. The indirect pyrolysis furnace heating system based on heat transfer oil according to claim 1, characterized in that, The first spiral heating tube (1) and the second spiral heating tube (3) have the same diameter, and the outer surface of the first spiral heating tube (1) is polished and treated with anti-corrosion.

4. The indirect pyrolysis furnace heating system based on heat transfer oil according to claim 1, characterized in that, The surface of the return pipe (2) is equipped with a pressure relief valve (10), and an outer casing (15) is fixedly sleeved on the outer wall of the return pipe (2) outside the pressure relief valve (10). The bottom surface of the outer casing (15) is connected to a temporary storage box (8) through the discharge pipe (11). The bottom surface of the temporary storage box (8) is connected to a second oil pump (9) through the discharge pipe (12), and the output end of the second oil pump (9) is connected to the return pipe (2) through the connecting pipe (13).

5. The indirect pyrolysis furnace heating system based on heat transfer oil according to claim 4, characterized in that, A one-way valve (14) is installed on the surface of the connecting pipe (13), and the installation direction of the one-way valve (14) is the same as the pumping direction of the second oil pump (9).

6. The indirect pyrolysis furnace heating system based on heat transfer oil according to claim 4, characterized in that, The volume of the temporary storage box (8) is greater than the thermal expansion volume of the heat transfer oil.

7. The indirect pyrolysis furnace heating system based on heat transfer oil according to claim 1, characterized in that, The second spiral heating tube (3) is installed on the outside of the pyrolysis furnace.

8. The indirect pyrolysis furnace heating system based on heat transfer oil according to claim 1, characterized in that, Both the first spiral heating tube (1) and the second spiral heating tube (3) are made of copper tubes.

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