CN216614521U

CN216614521U - Uniform temperature cracking furnace

Info

Publication number: CN216614521U
Application number: CN202123034879.6U
Authority: CN
Inventors: 杨松寿; 周鸿儒
Original assignee: Turpan Green Energy Technology Co ltd
Current assignee: Turpan Green Energy Technology Co ltd
Priority date: 2021-12-03
Filing date: 2021-12-03
Publication date: 2022-05-27
Anticipated expiration: 2031-12-03

Abstract

The utility model provides a uniform temperature cracking furnace, which comprises an outer furnace, an inner furnace, a plurality of flow guide pipes and a plurality of heat conduction clapboards, wherein the outer furnace and the inner furnace are respectively provided with a combustion chamber and a reaction chamber; therefore, the temperature inside the furnace body can be uniformly increased and heated, the energy consumption is effectively reduced, and the cracking efficiency is improved.

Description

Uniform temperature cracking furnace

Technical Field

The utility model relates to a cracking furnace, in particular to a uniform temperature cracking furnace capable of uniformly heating the interior of a furnace body.

Background

With the vigorous development of industry, a large number of plastic parts are used in daily life, and the recycling treatment of waste plastics is gradually emphasized due to the characteristic that waste plastics are not easy to decompose. In general, thermal cracking is mostly used for recycling waste plastics, and it mainly heats a furnace body continuously to a high temperature, so that waste plastics in the furnace body can be heated and decomposed into desired products.

In general, a cracking furnace usually employs a tumbling or internal stirring system to uniformly heat the waste plastics inside. However, the tumbling or stirring requires a large amount of power to drive, which consumes a lot of energy, and the effect of uniform heating inside is limited. In addition, a large amount of cold air can be mixed into the traditional cracking furnace during feeding and discharging, so that the purity of products is influenced by increasing oxygen in the furnace body, and the cracking efficiency is influenced by greatly reducing the temperature in the furnace body.

Disclosure of Invention

The utility model mainly aims to uniformly heat the interior of the furnace body, effectively reduce energy consumption and improve cracking efficiency.

In order to achieve the above object, the present invention provides a uniform temperature cracking furnace, comprising an outer furnace, an inner furnace, a plurality of flow guide pipes and a plurality of heat conducting partition plates, wherein the outer furnace is surrounded to form a combustion chamber, the inner furnace is arranged in the combustion chamber, the inner furnace is surrounded to form a reaction chamber, the reaction chamber comprises a heating zone, at least one part of each flow guide pipe crosses the heating zone, two ends of each flow guide pipe are respectively communicated with two different sides of the outer wall of the inner furnace, each heat conducting partition plate is respectively vertically arranged in the heating zone and extends from the inner wall of the inner furnace to the center of the inner furnace, each heat conducting partition plate is arranged above each flow guide pipe, and each heat conducting partition plate is radially arranged at equal included angle intervals to divide the heating zone into a plurality of sub-chambers.

The utility model also has the following effects: waste plastics can be stacked for heating through the bottom net, and the holes on the bottom net can allow decomposed carbon granules to fall into the collecting area. The honeycomb ducts which are arranged at equal included angle intervals can be evenly distributed to effectively achieve the effect of average heating. The profiles of the heat-conducting partition plates are connected by a plurality of arcs, so that the problem of overheating of the tip can be avoided under high temperature for a long time. Through the heat conduction partition plate which is narrow at the top and wide at the bottom and is pear-shaped, high-temperature heat energy at the bottom can be conducted upwards quickly and heated uniformly. Through the material conveying assembly penetrating through the outer furnace and the combustion chamber, high-temperature air flow in the combustion chamber can be preheated to improve the cracking efficiency and reduce the energy consumption. Waste plastics can fall from the center through the feeding and exhausting port in the center of the material guide plate, and cracked high-temperature gas is discharged upwards in a centralized manner without generating branch interference.

Drawings

Fig. 1 is a cross-sectional view of the present invention.

Fig. 2 is a cross-sectional view 2-2 of fig. 1.

Fig. 3 is a cross-sectional view of 3-3 of fig. 1.

Fig. 4 is a (first) sectional view showing a use state of the present invention.

Fig. 5 is a sectional view showing the state of use (two) of the present invention.

Wherein the reference numerals are:

10: an outer furnace 11: the combustion chamber 12: hot air inlet

20: an inner furnace 21: the reaction chamber 211: collecting region

212: heating area 212A: sub-chamber 213: feeding area

22: and (3) an air outlet pipe 30: the flow guide pipe 40: heat-conducting partition plate

50: bottom net 60: feeding mechanism 61: feeding tank

62: material conveying component 621: motor 622: screw rod

70: the material guide plate 71: feed vent 72: guiding slope

80: aggregate component 81: the blanking channel 82: conveying belt

A: waste plastics B: carbon particles C: high temperature gas

D: high temperature gas flow

Detailed Description

The following detailed description and technical contents of the present invention will be described with reference to the accompanying drawings, which are provided for illustrative purposes only and are not intended to limit the present invention.

The present invention provides a pyrolysis furnace for pyrolyzing a plurality of waste plastics A to produce carbon particles B and high-temperature gases C (such as alkanes and alkenes). Referring to fig. 1 to 3, the isothermal cracking furnace mainly includes an outer furnace 10, an inner furnace 20, a plurality of draft tubes 30 and a plurality of heat-conducting partitions 40.

A combustion chamber 11 is formed in the inner periphery of the outer furnace 10. In this embodiment, the bottom of the outer furnace 10 has a hot air inlet 12 communicated with the combustion chamber 11, and the hot air inlet 12 is used for receiving a high temperature air flow D generated by combustion of a burner (not shown). However, the present invention is not limited thereto, and for example, the bottom of the outer furnace 10 may be closed and the burner may be directly disposed at the bottom of the combustion chamber 11 of the outer furnace 10, as long as the high-temperature gas flow D generated by the burner can flow upward from the bottom of the combustion chamber 11.

The inner furnace 20 is provided in the combustion chamber 11, and has a substantially cylindrical shape. A reaction chamber 21 is formed in the inner periphery of the inner furnace 20. An air outlet pipe 22 penetrating the outer furnace 10 and communicating with the reaction chamber 21 is provided at the top of the inner furnace 20, so that the high-temperature gas C generated after pyrolysis can be discharged from the reaction chamber 21 through the air outlet pipe 22. The reaction chamber 21 comprises a collecting region 211, a heating region 212 and a feeding region 213 from bottom to top, wherein the collecting region 211 is located at the bottom of the reaction chamber 21, the feeding region 213 is located at the top of the reaction chamber 21, and the heating region 212 is located between the collecting region 211 and the feeding region 213. In the embodiment, the collecting region 211 is a funnel shape, but the utility model is not limited thereto. In addition, the isothermal cracking furnace of the present invention further comprises a bottom net 50. The bottom screen 50 is disposed at the junction between the collection zone 211 and the heating zone 212, so that the waste plastics a to be cracked can be stacked on the bottom screen 50 to be heated. The bottom net 50 has a plurality of holes for the decomposed carbon granules B to pass through and fall into the collecting region 211.

Each of the flow guide pipes 30 is a metal pipe body having a high melting point and a high thermal conductivity. Each guide pipe 30 crosses from the collection area 211 to the heating area 212 in a bridging manner, and both ends of each guide pipe 30 are respectively communicated with two opposite sides of the outer wall of the inner furnace 20. Specifically, each draft tube 30 extends upwardly from the collecting region 211 through the bottom net 50 and extends transversely along the bottom net 50 to connect to the walls of the inner furnace 20 on opposite sides. Thus, the high temperature gas flow D generated by the burner can enter from one end of each duct 30 located at the collecting region 211, and flow through each duct 30 and discharge to the outside of the inner furnace 20 on the opposite side, so that each duct 30 can be continuously heated by the flowing high temperature gas flow D. In the embodiment, the number of the draft tubes 30 is 3, but the utility model is not limited thereto. Preferably, the flow-guiding pipes 30 are arranged at equal angular intervals, so that the flow-guiding pipes 30 can be evenly distributed to effectively achieve the effect of even heating.

Each of the heat conductive partition plates 40 is a metal plate body having a high melting point and a high heat conductivity. Each of the thermal conductive partitions 40 is vertically disposed at the heating zone 212, respectively, and extends from the inner wall of the inner furnace 20 toward the center of the inner furnace 20. Each heat-conducting partition plate 40 is located above each flow guide pipe 30, and each heat-conducting partition plate 40 is radially arranged at equal included angle intervals to divide the heating area 212 into a plurality of sub-chambers 212A. In this way, the bottom of the sub-chamber 212A is provided with the draft tube 30 for heating, and the side edges are provided with 2 heat-conducting partition plates 40 for heating together with the inner wall of the inner furnace 20, so that the semi-molten waste plastics a in the sub-chamber 212A can be effectively heated and generate vortex, thereby achieving the effect of rapid and uniform temperature rise. Preferably, the number of the heat-conducting partition plates 40 in this embodiment is 6, so that the transverse cross section of each sub-chamber 212A is substantially regular triangle to achieve the best heating effect, but the utility model is not limited thereto, for example, the number of the heat-conducting partition plates 40 may also be two, three, four, five, or more than seven.

It is noted that the edge profile of each thermally conductive spacer 40 of the present invention is curvilinear. Specifically, the heat transfer partition 40 extends from the inner wall of the inner furnace 20 toward the center, and the edge located at the center side of the inner furnace 20 is formed by connecting a plurality of arcs, so that each heat transfer partition 40 can avoid the problem of overheating at the tip under high temperature for a long time. In addition, in the embodiment, each of the heat conductive partition plates 40 is generally shaped like a pear with a narrow top and a wide bottom, that is, the area of the lower half of the heat conductive partition plate 40 is larger than that of the upper half, but the utility model is not limited thereto. Thus, the larger area of the lower half part of the heat transfer partition plate 40 can quickly transfer the heat energy of the bottom part to the upper part, so that the waste plastics A can be uniformly heated and quickly reach a semi-molten state.

Further, the isothermal cracking furnace of the present invention further comprises a feeding mechanism 60 and a material guiding plate 70. The feeding mechanism 60 penetrates the top of one side of the outer furnace 10, the combustion chamber 11, the inner furnace 20 and the reaction chamber 21 and is used for feeding the waste plastics A from the feeding zone 213 to the heating zone 212, so that a large amount of air is not introduced during feeding to affect the product purity and the cracking efficiency. In this embodiment, the feeding mechanism 60 includes a feeding tank 61 and a feeding assembly 62, the feeding tank 61 is disposed outside the outer furnace 10 and is used for storing the waste plastics a to be cracked for quantitative feeding by the feeding assembly 62. In the embodiment, the feeding assembly 62 includes a motor 621 and a screw 622 driven by the motor 621, but the utility model is not limited thereto. In addition, the material transporting assembly 62 is disposed through the outer furnace 10 and the combustion chamber 11 and can be preheated by the high temperature airflow D in the combustion chamber 11 to improve the cracking efficiency and reduce the energy consumption. The material guiding plate 70 is disposed in the material feeding region 213, the material guiding plate 70 is substantially in an inverted cone shape, a material feeding exhaust port 71 is formed in the center of the material guiding plate 70, the material feeding exhaust port 71 enables waste plastics A to fall from the center in a centralized manner, and meanwhile, high-temperature gas C after cracking is discharged upwards in a centralized manner so as not to generate branch interference. The guide plate 70 forms an annular guide slope 72 between the inner wall of the inner furnace 20 and the feeding exhaust port 71, so that the waste plastics A can slide along the guide slope 72 to the feeding exhaust port 71 and then fall into the center of the heating zone 212. In the present embodiment, the guide slope 72 is a curved surface that curves downward from the inner wall of the inner furnace 20 toward the feed exhaust port 71, but the utility model is not limited thereto, and for example, the guide slope 72 may be an inclined surface as long as it can function to guide the waste plastics a to the feed exhaust port 71.

The isothermal cracking furnace of the present invention further comprises an aggregate component 80. The aggregate material assembly 80 is attached to the tapered bottom of the collection zone 211 and serves to collect carbon particles B that fall into the collection zone 211. In the embodiment, the aggregate assembly 80 includes a feeding channel 81 and a conveying belt 82, the feeding channel 81 communicates with the tapered bottom of the collecting region 211 and penetrates through the hot air inlet 12 to the outside of the outer furnace 10, and the falling carbon granules B are transported and collected to a desired place through the conveying belt 82, but the utility model is not limited thereto.

Referring to fig. 4 and 5, the cracking process of the isothermal cracking furnace of the present invention is briefly described as follows: after being charged into the feeding chute 61 of the feeding mechanism 60, the waste plastics a are quantitatively conveyed to the feeding area 213 in the reaction chamber 21 by the conveying assembly 62 for feeding, and then fall onto the bottom net 50 through the feeding exhaust port 71 at the center of the guide plate 70 for stacking. The high-temperature air flow D generated by the burner enters the combustion chamber 11 through the hot air inlet 12, part of the high-temperature air flow D flows through and heats the guide pipes 30 to heat the waste plastics a on the bottom net 50, and the rest flows upward from the bottom of the inner furnace 20 along the outer wall of the inner furnace 20 to heat the entire wall of the inner furnace 20. The heat-conducting partition plates 40 are heated by the heat energy conducted by the wall of the inner furnace 20, so that the highest temperature in the reaction chamber 21 is located in the draft tubes 30 of the bottom screen 50, and the waste plastics a therein is heated to a semi-molten state first and then conducted to the waste plastics a above through the heat-conducting partition plates 40 and the inner wall of the inner furnace 20, and when the waste plastics a in the whole sub-chamber 212A reaches the semi-molten state, a vortex is generated to perform heat convection so as to uniformly heat up the waste plastics a. When the temperature of the semi-molten waste plastic A is continuously raised to the cracking temperature, the semi-molten waste plastic A is decomposed into carbon granules B and high-temperature gas C, wherein the carbon granules B fall into the collecting region 211 through the bottom net 50, enter the blanking channel 81 along the funnel-shaped wall body and are transported to the outside through the conveyor belt 82, and the high-temperature gas C is discharged out of the reaction chamber 21 through the feeding exhaust port 71 and the exhaust pipe 22 in sequence, and can be cooled, liquefied and collected through a condenser (not shown).

The present invention is capable of other embodiments, and various changes and modifications can be made by one skilled in the art without departing from the spirit and scope of the utility model.

Claims

1. An isothermal cracking furnace, comprising:

the outer furnace is arranged around to form a combustion chamber;

the inner furnace is arranged in the combustion chamber, and is surrounded to form a reaction chamber which comprises a heating zone;

at least one part of each flow guide pipe crosses the heating area, and two ends of each flow guide pipe are respectively communicated with two opposite sides of the outer wall of the inner furnace; and

and the heat conduction clapboards are respectively vertically arranged in the heating area and extend from the inner wall of the inner furnace to the center of the inner furnace, are positioned above the flow guide pipes, and are arranged in a radial shape at equal included angle intervals to divide the heating area into a plurality of sub-chambers.

2. The pyrolysis furnace of claim 1, wherein each of the thermally conductive partitions has an edge profile that is curved.

3. The pyrolysis furnace of claim 1, wherein each of the heat conducting partitions is narrow at the top and wide at the bottom.

4. The pyrolysis furnace of claim 1, wherein the number of the heat conducting partition plates is 6, and the transverse cross section of each sub-chamber is in a regular triangle shape.

5. The pyrolysis furnace of claim 1, wherein the draft tubes are arranged at equal angular intervals.

6. The pyrolysis furnace of claim 1, wherein the reaction chamber further comprises a collection zone and a feed zone, the collection zone is located below the heating zone, and the feed zone is located above the heating zone.

7. The isothermal cracking furnace of claim 6, wherein each of the flow conduits spans from the collection zone to the heating zone.

8. The pyrolysis furnace of claim 6, wherein the feeding region is provided with a guide plate, and the guide plate is formed with a guide slope.

9. The soaking pyrolysis furnace of claim 6, comprising a bottom screen disposed between the collection zone and the heating zone.

10. The pyrolysis furnace as claimed in claim 1, wherein the top of the inner furnace is provided with an air outlet pipe penetrating out of the outer furnace, and the air outlet pipe is communicated with the reaction chamber.