Pyrolysis energy saving heating device

Abstract

The utility model discloses a thermal cracking energy -conserving heating device relates to thermal cracking technical field, especially a kind of energy -conserving heating device by heating contact area is big, to provide heating benefit big and reduce energy consumption, it is mainly on the outer diameter of the initial stage thermal cracking machine of thermal cracking and is provided with multiple recesses of inner recess spiral shape, the recess can be completely embedded and nested for heat pipe, the complete heating of the heating contact area of the multiple faces between heat pipe and recess, to increase the heating benefit of initial stage thermal cracking machine, and reduce energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of thermal pyrolysis technology, and in particular to a thermal pyrolysis energy-saving heating device. Background Technology

[0002] Waste materials generated during the manufacturing process of plastic fibers, plastic products, and other related industries, as well as waste plastics collected by recycling plants, are subjected to pyrolysis in an anaerobic or anaerobic environment. This process involves heating long-chain organic compounds to break their molecular bonds, ultimately decomposing them into smaller molecular structures as byproducts (such as fuel oil) and water. Pyrolysis technology involves feeding waste plastics into an oiling facility, where they undergo pyrolysis, vaporization, condensation, separation, and distillation to obtain plastic pyrolysis oil. This oil is then further processed through distillation and condensation to convert it into liquid or gaseous fuel oil for industrial use.

[0003] For general thermal decomposition treatment, please refer to [link / reference]. Figure 1 , Figure 2 As shown, the waste plastic is mainly fed into the feed port 12 on the body 11 of a feeding device 10, and conveyed by the conveying screw 13. The outer periphery of the conveying screw 13 is provided with an electric heater 14, and it can be fed into the feed port of a thermal cracking reactor 20 and enter the thermal cracking reaction chamber 21. The thermal cracking reaction chamber 21 is provided with a heating device 22 on its periphery. The upper part of the thermal cracking reaction chamber 21 has an oil output pipe 23 for discharging the gas and cracked oil after cracking. The bottom of the thermal cracking reaction chamber 21 is provided with a conveying pipe 24 to discharge the carbon black produced after the thermal cracking reaction. One end of the oil output pipe 23 is connected to a fractionator 30.

[0004] Thus, the material is conveyed by the conveying screw 13 of the feeding device 10 at the feeding end and enters the pyrolysis reaction chamber 21. Using pyrolysis technology, the plastic waste undergoes a pyrolysis reaction under the high temperature and oxygen-deficient conditions of the pyrolysis furnace. The carbon black produced after pyrolysis is discharged out of the furnace through the conveying pipe 24 at the discharge end. At this time, the oil and gas can enter the fractionator 30 through the oil output pipe 23 and be fractionated to obtain oil (diesel and gasoline). The electric heater 14 can provide heating for the machine body 11. The electric heater 14 is generally wrapped with copper wire around the outer diameter of the machine body 11. That is, the electric heater 14 and the machine body 11 have point-to-point contact and heat conduction, which makes its heating effect insignificant and further increases energy consumption. Utility Model Content

[0005] Therefore, based on years of experience in processing various household waste, waste plastics, and waste rubber, and considering the environmental pollution caused by incineration and landfill, as well as the urgent need for alternative energy sources, the inventor actively researched and improved this invention to provide a device that recovers waste through pyrolysis, achieving the production and collection of gas and pyrolysis oil. Through numerous trials and modifications, this invention was finally developed. This invention utilizes a large heating contact area to provide an energy-saving heating device with high heating efficiency and reduced energy consumption.

[0006] The main objective of this invention is to provide an energy-saving heating device that increases the heating efficiency of the initial stage of the pyrolysis machine and reduces energy consumption by providing multiple concave spiral grooves on the outer diameter of the machine body. These grooves allow heat-conducting pipes to be fully embedded and fitted, resulting in a multi-faceted heating contact area between the heat-conducting pipes and the grooves.

[0007] Another objective of this invention is to provide an energy-saving heating device that, by providing an insulation layer, prevents heat from diffusing outside the machine body through the insulation layer after the heat-conducting pipe has been heated, thereby saving energy consumption and achieving thermal decomposition.

[0008] To achieve the above objectives, this utility model provides a pyrolysis energy-saving heating device, which mainly consists of a cylindrical machine body supported by a frame of a primary pyrolysis machine. A conveying screw is installed inside the machine body, and a feed hopper is located at the front of the machine body to allow waste plastic conveyed by a conveyor belt to be fed into the machine body. A discharge pipe is located at the end of the machine body, connected to the inlet of a pyrolysis reactor to allow molten plastic waste to enter the pyrolysis reaction chamber. A heating device is installed around the periphery of the pyrolysis reaction chamber, and an oiling output pipe is located at the top of the pyrolysis reaction chamber to discharge the pyrolysis gas and pyrolysis oil to a fractionation tank. A conveying pipe is located at the bottom of the pyrolysis reaction chamber to discharge the carbon black produced after the pyrolysis reaction. Multiple grooves are provided on the outer diameter of the machine body, and heat-conducting pipes are fitted inside these grooves, with a heating layer surrounding the heat-conducting pipes.

[0009] As a further improvement to the above technical solution, a plurality of concave spiral grooves are provided on the outer diameter of the machine body, and the heat conduction pipe can be sleeved inside the grooves.

[0010] As a further improvement to the above technical solution, the depth of the groove is greater than the outer diameter of the heat pipe.

[0011] As a further improvement to the above technical solution, the heat pipe is filled with a heat conduction medium.

[0012] As a further improvement to the above technical solution, the heat transfer medium can be any one of heat transfer oil, hot steam, or hot molten salt.

[0013] As a further improvement to the above technical solution, the heating layer contains an electromagnetic heater.

[0014] As a further improvement to the above technical solution, a heat insulation layer is provided between the heat pipe and the heating layer. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a conventional waste plastic pyrolysis device.

[0017] Figure 2 for Figure 1 Enlarged schematic diagram of part of it.

[0018] Figure 3 This is a schematic diagram of the combined energy-saving heating device for thermal pyrolysis according to this utility model.

[0019] Figure 4 This is a three-dimensional appearance diagram of the initial stage pyrolysis machine of this utility model.

[0020] Figure 5 This is a cross-sectional schematic diagram of the initial stage pyrolysis machine of this utility model.

[0021] Figure 6 This utility model Figure 5 Enlarged schematic diagram of part of it.

[0022] Figure 7 This is a three-dimensional appearance diagram of the body of this utility model.

[0023] Figure 8 This is a plan view of the body of this utility model.

[0024] Figure 9 This utility model Figure 8 Enlarged schematic diagram of part of it.

[0025] In the diagram: 10-Feeding device; 11-Machine body; 12-Inlet; 13-Conveying screw; 20-Pyrolysis reactor; 21-Pyrolysis reaction chamber; 22-Heating device; 23-Oil-to-water output pipe; 24-Conveying pipe; 30-Fractor; 40-Primary stage pyrolysis machine; 41-Frame; 42-Machine body; 421-Feed hopper; 422-Groove; 43-Conveying screw; 44-Heat pipe; 45-Heating layer; 46-Outlet pipe; 47-Insulation layer; 50-Pyrolysis reactor; 51-Inlet; 52-Pyrolysis reaction chamber; 53-Heating device; 54-Oil-to-water output pipe; 55-Conveying pipe. Detailed Implementation

[0026] To achieve the above objectives, the structural content and features of this utility model will be described in detail below with reference to the accompanying drawings. It is believed that this will enable a further understanding of the content of this utility model and its effects.

[0027] Please see Figures 3 to 9 As shown, the energy-saving heating device for pyrolysis of this utility model mainly includes a primary pyrolysis machine 40 and a pyrolysis reactor 50, wherein:

[0028] A primary pyrolysis machine 40 is provided, which consists of a cylindrical body 42 supported by a frame 41. A conveying screw 43 is located inside the body 42, and a feed hopper 421 is located at the front of the body 42. The feed hopper 421 allows waste plastic conveyed by a conveyor belt to be fed into the body 42. Multiple concave spiral grooves 422 are provided on the outer diameter of the body 42, and heat-conducting pipes 44 can be fitted into these grooves. The depth of 422 is greater than the outer diameter of the heat pipe 44, so that the heat pipe 44 can be completely fitted into the groove 422. The heat pipe 44 is filled with a heat conduction medium, which can be heat conduction oil, hot steam, hot molten salt, etc. Each heat pipe 44 is provided with a heating layer 45, and an electromagnetic heater is provided inside the heating layer 45. A discharge pipe 46 is provided at the end of the body 42, and a heat insulation layer 47 is provided between the heat pipe 44 and the heating layer 45.

[0029] A pyrolysis reactor 50 is provided with a feed inlet 51, which is connected to the discharge pipe 46 of the primary pyrolysis machine 40, and can allow molten plastic waste to enter the pyrolysis reaction chamber 52. A heating device 53 is provided on the periphery of the pyrolysis reaction chamber 52, and an oiling output pipe 54 is provided on the upper part of the pyrolysis reaction chamber 52 to discharge the pyrolysis gas and pyrolysis oil to the fractionation tank. A conveying pipe 55 is provided at the bottom of the pyrolysis reaction chamber 52 to discharge the carbon black produced after the pyrolysis reaction.

[0030] In this way, waste materials generated during the production process of plastic fiber and plastic product manufacturing industries, as well as waste plastics recycled by resource recycling plants, are fed into the feed hopper of the conveyor belt and conveyed forward to the feed hopper 421 of the body 42 of the primary pyrolysis machine 40. The waste plastics then enter the body 42 and are conveyed towards the discharge pipe 46 within the body 42 by the conveying screw 43. During the conveying process within the body 42, multiple concave spiral grooves 422 are provided on the outer diameter of the body 42. The groove 422 allows the heat pipe 44 to be completely embedded, enabling the heat energy conducted through the heat transfer medium to flow within the heat pipe 44. This allows the waste plastic inside the machine body 42 to be transported and gradually decomposed. Furthermore, because the heat pipe 44 is fitted into the groove 422, there is a multi-faceted heating contact area between the heat pipe 44 and the groove 422, increasing the thermal efficiency of the initial stage pyrolysis machine and achieving energy-saving heating with reduced energy consumption. Multiple heat pipes 44 are connected by a heating layer 4... Heating at 5 (temperature controlled between 100℃ and 280℃) allows the waste plastic in the machine body 42 to be gradually decomposed while being transported. It reaches the melting stage at the end of the machine body 42 (i.e., the waste plastic becomes fluid). The fluid waste plastic is discharged from the discharge pipe 46 at the end of the machine body 42 and enters the pyrolysis reaction chamber 52 through the inlet 51 on the pyrolysis reactor 50. The heating device 53 installed on the periphery of the pyrolysis reactor 50 heats the temperature to 300℃ to 800℃, causing the long-chain organic compounds in the fluid waste plastic to break their molecular bonds and finally decompose into smaller molecular structures, achieving the production of gas and pyrolysis oil. The oil is output through the oil output pipe 54. Since the water content of the waste plastic in the melting stage is almost zero when it enters the pyrolysis reaction chamber, a more complete pyrolysis reaction can be obtained to obtain oil and gas of better quality. The carbon black produced by the pyrolysis is concentrated at the bottom of the pyrolysis reaction chamber 52 and is discharged through a conveying pipe 55.

[0031] Furthermore, the insulation layer 47 prevents the heat from the heating layer 45 from only heating the heat pipe 44 and not spreading to the outside of the body 42.

[0032] Thus, this utility model can achieve the following:

[0033] (1) The pyrolysis device reaches the melting stage of waste plastics by using a primary pyrolysis machine. Multiple concave spiral grooves are set on the outer diameter of the machine body. The heat conduction pipe can be completely embedded in the groove, so that the heat conduction pipe and the groove have a multi-faceted heating contact area for complete heating, thereby increasing the heating efficiency of the primary pyrolysis machine and reducing energy consumption.

[0034] (2) By setting up the insulation layer, the heat pipe after being heated can be blocked by the insulation layer, which can prevent heat from spreading to the outside of the machine body and save energy consumption, so as to achieve the energy-saving heating device of thermal decomposition.

[0035] The above-described present invention is merely an example of the preferred embodiment. Those skilled in the art can make various modifications and implementations, but all such modifications and implementations should be included within the spirit and scope of the present invention.

[0036] In summary, this utility model utilizes multiple concave spiral grooves on the outer diameter of the device, within which a heat-conducting pipe can be fully embedded, ensuring comprehensive heating through multi-faceted heating contact between the heat-conducting pipe and the groove. The structural changes and functional improvements are undeniable. Furthermore, this utility model was not previously published or publicly used, thus meeting the requirements for a patent application. Therefore, this patent application is filed in accordance with the law.

Claims

1. A pyrolysis energy-saving heating device, mainly consisting of a primary pyrolysis machine with a cylindrical body supported by a frame. A conveying screw is installed inside the body, and a feed hopper is located at the front of the body for feeding waste plastic conveyed by a conveyor belt into the machine. A discharge pipe is located at the end of the body, connected to the inlet of a pyrolysis reactor to allow molten plastic waste to enter the pyrolysis reaction chamber. A heating device is installed around the perimeter of the pyrolysis reaction chamber. An oil discharge pipe is located at the top of the pyrolysis reaction chamber to discharge the pyrolysis gas and pyrolysis oil to a fractionation tank. A conveying pipe is located at the bottom of the pyrolysis reaction chamber to discharge the carbon black produced after the pyrolysis reaction. The device is characterized in that… Multiple grooves are provided on the outer diameter of the machine body, and a heat-conducting pipe can be fitted inside the grooves. A heating layer is provided outside the heat-conducting pipe.

2. The pyrolysis energy-saving heating device according to claim 1, characterized in that, The outer diameter of the machine body is provided with multiple concave spiral grooves, and the heat conduction pipes can be fitted inside the grooves.

3. The pyrolysis energy-saving heating device according to claim 1, characterized in that, The depth of the groove is greater than the outer diameter of the heat pipe.

4. The pyrolysis energy-saving heating device according to claim 1, characterized in that, The heat pipe is filled with a heat conduction medium.

5. The pyrolysis energy-saving heating device according to claim 4, characterized in that, The heat transfer medium can be any one of heat transfer oil, hot steam, or hot molten salt.

6. The pyrolysis energy-saving heating device according to claim 1, characterized in that, The heating layer contains an electromagnetic heater.

7. The pyrolysis energy-saving heating device according to claim 1, characterized in that, An insulation layer is provided between the heat pipe and the heating layer.

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