A tire crushing device and method for pyrolysis of waste tires

Abstract

The present invention discloses a tire crushing device and method for waste tire pyrolysis, which relates to the technical fields of rubber recycling and pyrolysis treatment. In the present invention: a crushing cavity is formed inside the inner lining steel sleeve, and an annular side air gap is formed between the inner lining steel sleeve and the inner wall of the tank body. A cylindrical electromagnetic body is arranged inside the rotating shaft tube, an electromagnetic control mechanism is arranged above the tank body, and the electromagnetic control mechanism is provided with a brush module electrically connected to the electromagnetic body. A photoelectric sensor module for sensing and detecting the real-time size of rubber particles in the crushing cavity is arranged on the top side of the tank body. A cooling mechanism is arranged above the tank body, the air inlet end of the cooling mechanism is communicated with the crushing cavity, and the air outlet end of the cooling mechanism is communicated with the annular side air gap. The present invention realizes the precise control of the entire crushing process, ensures the crushing effect, improves the efficiency of the crushing process, and reduces the crushing energy consumption to a certain extent.

Description

Technical Field

[0001] The present invention relates to the technical field of rubber recycling and pyrolysis treatment processes, and particularly relates to a tire crushing device and method for pyrolyzing waste tires. Background Art

[0002] Before waste tires are pyrolyzed, they need to be crushed into small particles for efficient pyrolysis treatment.

[0003] However, when waste tires are put into a crushing device for crushing, the temperature will rise due to crushing friction, etc., resulting in a large elasticity of the rubber blocks formed by preliminary chopping. Coupled with the gradually decreasing size of the rubber blocks, it becomes increasingly difficult for the crushing mechanism to further efficiently crush the rubber blocks into smaller granular sizes. Forcing an increase in the crushing power and increasing the crushing time have become common methods to ensure the crushing degree of rubber blocks. However, these methods not only greatly increase the energy consumption but also seriously affect the efficiency of the crushing process.

[0004] In summary, how to efficiently complete the crushing operation of waste tires, improve the further crushing efficiency of rubber blocks after preliminary crushing, and reduce the crushing energy consumption to a certain extent has become a problem to be solved. Summary of the Invention

[0005] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention provides a tire crushing device for pyrolyzing waste tires, including a tank body, a rotating shaft pipe located inside the tank body, crushing blades fixedly connected to the rotating shaft pipe, and a motor for driving the rotating shaft pipe to rotate. An inner lining steel sleeve sleeved outside the crushing blades is arranged in the inner cavity of the tank body. A crushing cavity is formed inside the inner lining steel sleeve, and an annular side air gap is formed between the inner lining steel sleeve and the inner wall of the tank body. Among them, a plurality of air inlet conical grooves are provided on one side of the inner lining steel sleeve facing the annular side air gap, and a plurality of air outlet conical grooves are provided on the side facing the crushing cavity. Vent holes are opened between the air inlet conical grooves and the air outlet conical grooves.

[0007] A cylindrical electromagnet is arranged inside the rotating shaft pipe, and an electromagnetic control mechanism is arranged above the tank body. The electromagnetic control mechanism is provided with a brush module electrically connected to the electromagnet.

[0008] A photoelectric sensor module for sensing and detecting the real-time size of rubber particles in the crushing cavity is arranged on the top side of the tank body. A cooling mechanism is arranged above the tank body. The air inlet end of the cooling mechanism is communicated with the crushing cavity, and the air outlet end of the cooling mechanism is communicated with the annular side air gap.

[0009] As a preferred technical solution of the device of the present invention: A bracket is fixedly arranged at the bottom of the tank body, the motor is installed at the cross beam position of the bracket, the output shaft of the motor faces upward and passes through the bottom of the tank body, and the output shaft of the motor is fixedly connected to the rotating shaft pipe.

[0010] As a preferred technical solution of the device of the present invention: the rotating shaft tube is made of an austenitic stainless steel tube body, and a top shaft sleeve rotatably connected to the rotating shaft tube is arranged at the top of the tank body.

[0011] As a preferred technical solution of the device of the present invention: the size of the ventilation hole is smaller than the size of the rubber particles after reaching the crushing standard.

[0012] As a preferred technical solution of the device of the present invention: a plurality of diversion ports are arranged at the bottom of the inner lining steel sleeve, and the tank body is provided with a diversion slope at the bottom of the annular side air gap and a drainage slope at the bottom of the crushing cavity. The diversion slope is inclined downward towards the diversion port, and the drainage slope is inclined upward towards the rotating shaft tube.

[0013] As a preferred technical solution of the device of the present invention: the tank body is provided with a top cover, and a filter element communicated with the air inlet end of the cooling mechanism is embedded in the top cover.

[0014] As a preferred technical solution of the device of the present invention: the cooling mechanism is configured with a circulation pump for sucking air flow, a cooling chamber for cooling the air flow, and a temperature monitoring module for monitoring the temperature of the air flow entering the cooling chamber. A supply air pipe is arranged between the cooling chamber of the cooling mechanism and the annular side air gap of the tank body.

[0015] As a preferred technical solution of the device of the present invention: the air outlet direction of the supply air pipe towards the annular side air gap is tangent to the tank body wall surface.

[0016] The present invention also provides a tire crushing method for waste tire pyrolysis, including the following contents:

[0017] S1. The waste tire raw material is put into the tank body after preliminary cutting, and the motor is started to start crushing the waste tire raw material.

[0018] S2. When the photoelectric sensing module detects that the size of the crushed rubber particles is smaller than a preset first specification size , the cooling mechanism is started to suck the hot air flow in the crushing cavity, and after cooling to the standard, it is re-introduced into the annular side air gap. The low-temperature air flow in the annular side air gap is discharged into the crushing cavity from the air outlet conical groove, blowing the rubber particles close to the inner lining steel sleeve towards the crushing blades, and cooling the rubber particles in the crushing cavity. Among them, the first specification size is the size of the rubber particles after the waste tire raw material is initially crushed.

[0019] Suppose the real-time size of the rubber particles detected by the photoelectric sensing module is , , then the gas circulation rate of the cooling mechanism , where is the parameter function of the gas circulation rate , , is Parameter function

[0020] S3. While the cooling mechanism is started, the electromagnetic control mechanism is started, and the electromagnetic control mechanism controls the electromagnetic power of the electromagnet to be , and the electromagnet performs periodic electromagnetic attraction on the rubber block containing iron wire. Among them, is the preset standard current intensity, is the time parameter, is related to a negatively correlated coefficient, is related to a positively correlated coefficient

[0021] S4. Shutdown condition: When the photoelectric sensing module detects that the size of the rubber particles is smaller than the preset second specification size , , the delay module of the control system is started. If the size of the rubber particles meets the above shutdown conditions during the delay stage, after the delay module ends, the control system determines that the crushing process is completed and the entire equipment shuts down

[0022] Compared with the existing technology, the beneficial effects of the present invention are as follows

[0023] 1. In the present invention, the cooling mechanism is started when the rubber particles are smaller than the preset first specification size, the hot air flow in the crushing chamber is inhaled, cooled, and then introduced into the annular side air gap, and then discharged into the crushing chamber from the air outlet conical groove to cool the rubber particles, reduce their elasticity, and make the subsequent crushing more efficient

[0024] 2. In the present invention, the electromagnetic control mechanism controls the electromagnet to perform periodic electromagnetic attraction on the rubber block containing iron wire, so that the rubber block makes periodic movements closer to and farther away from the rotating shaft tube, enhances the random movement, and avoids the problem of reduced crushing efficiency caused by a single centrifugal movement

[0025] 3. In the present invention, the photoelectric sensor module real-time detects the size of the rubber particles in the crushing chamber, controls the start and operation parameters of the cooling mechanism and the electromagnetic control mechanism according to the detection results, and judges the shutdown conditions based on the size of the rubber particles, realizing precise control of the entire crushing process, ensuring the crushing effect, improving the efficiency of the crushing process, and reducing the crushing energy consumption to a certain extent Description of the drawings

[0026] Figure 1 is the overall structural schematic diagram of the equipment of the present invention

[0027] Figure 2 is Figure 1 the locally enlarged structural schematic diagram at A in

[0028] Figure 3 is Figure 2Schematic diagram of the locally enlarged structure at position C in the [device].

[0029] Figure 4 is Figure 1 Schematic diagram of the locally enlarged structure at position B in the [device].

[0030] Figure 5 is Figure 1 Schematic diagram of the locally enlarged structure at position D in the [device].

[0031] Wherein: 1 - tank body, 101 - feed inlet, 102 - discharge outlet, 103 - crushing chamber, 104 - top cover, 105 - filter element, 106 - diversion slope, 107 - drainage slope, 108 - top end bushing; 2 - support; 3 - motor; 4 - rotating shaft tube, 401 - crushing blade; 5 - inner lining steel sleeve, 501 - intake conical groove, 502 - vent hole, 503 - outlet conical groove, 504 - diversion port; 6 - annular side air gap; 7 - cooling mechanism, 701 - circulation pump, 702 - cooling chamber, 703 - temperature monitoring module; 8 - gas supply pipe; 9 - electromagnetic control mechanism, 901 - brush module; 10 - electromagnet; 11 - top frame; 12 - photoelectric sensing module. Detailed implementation manners

[0032] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] Embodiment 1. The present invention designs a waste tire crushing device before the cracking process. Please refer to Figure 1 、 Figure 2 , which mainly includes a tank body 1, a motor 3, an inner lining steel sleeve 5, an annular side air gap 6, a cooling mechanism 7, an electromagnetic control mechanism 9, an electromagnet 10, and a photoelectric sensing module 12. The specific structural configuration is as follows:

[0034] I. Tank body assembly

[0035] Tank body 1: Please refer to Figure 1 , as the main body structure of the entire device, a feed inlet 101 is provided on the top side of the tank body 1 for inputting the waste tire raw materials after preliminary cutting. A discharge outlet 102 is provided on the top and bottom sides of the tank body 1, and the rubber particles that meet the crushing standard are discharged therefrom. A support 2 is fixedly arranged at the bottom of the tank body 1 to play a role in supporting the entire device and enabling the device to be stably placed. The motor 3 is installed at the crossbar position of the support 2, and the output shaft of the motor 3 faces upward and passes through the bottom of the tank body 1 and is fixedly connected to the rotating shaft tube 4 to provide power for the rotation of the rotating shaft tube 4, thereby driving the crushing blade 401 to rotate to realize the crushing of waste tires.

[0036] Inner lining steel sleeve 5: Please refer to Figure 1 、Figure 3 , Figure 4 , which is arranged in the inner cavity of the tank body 1 and sleeved around the periphery of the crushing blade 401. The inner part thereof encloses a crushing cavity 103, and the crushing process of waste tires is carried out in this cavity. The inner lining steel sleeve 5 is provided with a plurality of air inlet conical grooves 501 on the side facing the annular side air gap 6 and a plurality of air outlet conical grooves 503 on the side facing the crushing cavity 103. Ventilation holes 502 are provided between the air inlet conical grooves 501 and the air outlet conical grooves 503, and the size of the ventilation holes 502 is smaller than the size of the rubber particles after reaching the crushing standard, so as to prevent the rubber particles from entering the annular side air gap 6. The bottom of the inner lining steel sleeve 5 is provided with a plurality of diversion openings 504, which cooperate with the structure at the bottom of the tank body 1 to realize the treatment of rubber particles and impurities.

[0037] Annular side air gap 6: Please refer to Figure 1 , Figure 3 , Figure 4 , the annular side air gap 6 is located between the inner lining steel sleeve 5 and the inner wall of the tank body 1. During the operation of the equipment, the annular side air gap 6 is used to accommodate the airflow cooled by the cooling mechanism 7. These airflows enter the crushing cavity 103 through the air outlet conical grooves 503 on the inner lining steel sleeve 5 to cool and blow the rubber particles. The tank body 1 is provided with a diversion slope 106 at the bottom of the annular side air gap 6. The diversion slope 106 slopes downward towards the diversion opening 504. When the rubber particles fall to the bottom of the tank body 1, the airflow at the diversion opening 504 blows up the rubber particles falling to the bottom along the diversion slope 107 for continuous crushing. The diversion opening 504 can also discharge a small amount of rubber debris and impurities entering the annular side air gap 6.

[0038] Top cover 104: Please refer to Figure 1 , Figure 2 , the tank body 1 is provided with a top cover 104, and a filter element 105 communicated with the air inlet end of the cooling mechanism 7 is embedded in the top cover 104. The filter element 105 can prevent the rubber particles in the airflow from entering the cooling mechanism 7, ensure the normal operation of the cooling mechanism 7, and avoid damage or blockage of the internal components of the cooling mechanism 7 by the rubber particles.

[0039] Top end shaft sleeve 108: Please refer to Figure 1 , Figure 5 , the top of the tank body 1 is configured with a top end shaft sleeve 108 rotatably connected to the rotating shaft tube 4, which reduces the friction when the rotating shaft tube 4 rotates and ensures that the rotating shaft tube 4 can rotate stably and smoothly.

[0040] II. Crushing assembly

[0041] Rotating shaft tube 4: Please refer to Figure 1 , Figure 5, an austenitic stainless steel pipe body is adopted, and this material has little influence on the magnetic force of the electromagnetic body 10 acting outward. A cylindrical electromagnetic body 10 is arranged inside the rotating shaft pipe 4 and cooperates with the electromagnetic control mechanism 9 to perform electromagnetic action on the rubber block containing iron wire. A crushing blade 401 is fixedly connected to the rotating shaft pipe 4. Driven by the motor 3, the rotating shaft pipe 4 rotates, and the crushing blade 401 crushes the waste tire.

[0042] Motor 3: Please refer to Figure 1 , as a power source, the motor 3 is installed on the bracket 2, and its output shaft is fixedly connected to the rotating shaft pipe 4. After the motor 3 is started, it drives the rotating shaft pipe 4 to rotate at a high speed, so that the crushing blade 401 obtains sufficient kinetic energy to crush the waste tire. The rotation speed and power of the motor 3 can be selected and adjusted according to actual needs to adapt to different crushing working conditions.

[0043] III. Auxiliary components

[0044] Cooling mechanism 7: Please refer to Figure 1 、 Figure 2 、 Figure 3 , which is equipped with a circulation pump 701 for inhaling air flow, a cooling chamber 702 for cooling the air flow, and a temperature monitoring module 703 for monitoring the temperature of the air flow entering the cooling chamber 702. The air inlet end of the cooling mechanism 7 is communicated with the crushing chamber 103, and the air outlet end is communicated with the annular side air gap 6 through the air supply pipe 8. The circulation pump 701 inhales the hot air flow in the crushing chamber 103 into the cooling chamber 702, the temperature monitoring module 703 monitors the air flow temperature in real time, and the cooled air flow enters the annular side air gap 6 through the air supply pipe 8. The air outlet direction of the air supply pipe 8 towards the annular side air gap 6 is tangent to the wall surface of the tank body 1, so that the air flow entering the annular side air gap 6 can be distributed more evenly, and the air outlet cone grooves 503 at each position of the inner lining steel sleeve 5 can obtain sufficient air flow, which can not only cool the rubber particles, but also "blow" the rubber block impacted by centrifugal force in the reverse direction, reducing the impact, friction and other damages of the rubber block containing hard substances such as iron wire on the inner lining steel sleeve 5.

[0045] Electromagnetic control mechanism 9: Please refer to Figure 1 、 Figure 5 , which is arranged above the tank body 1. A top frame 11 is arranged above the tank body 1, and the electromagnetic control mechanism 9 is fixedly installed on the installation structure of the top frame 11. The electromagnetic control mechanism 9 is equipped with a brush module 901 electrically connected to the electromagnetic body 10, which supplies power to the electromagnetic body 10 through the brush module 901 and controls the electromagnetic power of the electromagnetic body 10 to realize periodic electromagnetic attraction on the rubber block containing iron wire.

[0046] Photoelectric sensor module 12: Please refer to Figure 1 、 Figure 2, installed on the top side of the tank body 1, is used for sensing and detecting the real-time size of rubber particles in the crushing cavity 103. According to the detected size of rubber particles, the control system can control the startup and operating parameters of the cooling mechanism 7 and the electromagnetic control mechanism 9, and judge the shutdown conditions based on the size of rubber particles to achieve precise control of the entire crushing process.

[0047] Embodiment 2. The present invention designs a tire crushing method for pyrolysis of waste tires, which specifically includes the following contents:

[0048] First, raw material input and preliminary crushing: After the waste tire raw materials are preliminarily cut, they are put into the tank body 1, and the motor 3 is started to start crushing the waste tire raw materials.

[0049] Second, startup of the cooling mechanism and control of air flow circulation: When the photoelectric sensing module 12 detects that the size of the crushed rubber particles is smaller than the preset first specification size (the first specification size is the size of rubber particles after the preliminary crushing of the waste tire raw materials preset according to experience), the cooling mechanism 7 is started, inhaling the hot air flow in the crushing cavity 103, and after reaching the cooling standard, it is re-introduced into the annular side air gap 6. The low-temperature air flow in the annular side air gap 6 is discharged into the crushing cavity 103 from the air outlet conical groove 503, blowing the rubber particles close to the inner lining steel sleeve 5 towards the crushing blade 401, and cooling the rubber particles in the crushing cavity 103, thereby reducing the elasticity of the rubber particles and facilitating more efficient crushing of them.

[0050] Suppose the real-time size of the rubber particles detected by the photoelectric sensing module 12 is , , then the gas circulation rate of the cooling mechanism 7, that is, the smaller the rubber particles, the lower the gas circulation rate of the cooling mechanism 7. But the air flow temperature is still controlled according to the normal standard. Among them is the parameter function of the gas circulation rate , , is 's parameter function.

[0051] Third, startup of the electromagnetic control mechanism and electromagnetic attraction effect: When the cooling mechanism 7 is started, the electromagnetic control mechanism 9 is started. The electromagnetic control mechanism 9 controls the electromagnetic power of the electromagnet 10 to be , where is the preset standard current intensity, is the time parameter, is related to a negatively correlated coefficient, is related to The coefficient of positive correlation means that the smaller the rubber particles are, the smaller the actual peak electromagnetic intensity of the electromagnet 10 is, and the longer the change period is.

[0052] The electromagnet 10 performs periodic electromagnetic attraction on the rubber block containing iron wire, so that the rubber block containing iron wire moves towards the direction of the rotating shaft tube 4 more periodically, and then moves away from the axial tube 4, enhancing the random movement of the rubber block and avoiding the problem of reduced crushing efficiency caused by single centrifugal movement. Moreover, there is no need to worry that the rubber block containing iron wire is completely adsorbed on the surface of the rotating shaft tube 4, because the minimum value of the electromagnetic power is zero. When the electromagnetic power is small or zero, the rubber block containing iron wire is thrown away by the centrifugal force again.

[0053] Fourth, shutdown condition: When the photoelectric sensing module 12 detects that the size of the rubber particles is smaller than the preset second specification size , , the delay module of the control system is started. If the size of the rubber particles meets the above shutdown conditions during the delay stage, after the delay module ends, the control system determines that the crushing process is completed and the entire device shuts down.

[0054] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A tire crushing method for pyrolysis of waste tires, characterized in that: S1. The waste tire raw material is put into the tank body (1) after preliminary cutting, and the motor (3) is started to start crushing the waste tire raw material. S2. When the photoelectric sensing module (12) detects that the size of the broken rubber particles is smaller than the preset first specification size , the cooling mechanism (7) is activated to inhale the hot air flow in the crushing chamber (103), and after reaching the cooling standard, it is re-introduced into the annular side air gap (6). The low-temperature air flow in the annular side air gap (6) is discharged into the crushing chamber (103) from the air outlet conical groove (503), blowing the rubber particles near the inner lining steel sleeve (5) towards the crushing blade (401) and cooling the rubber particles in the crushing chamber (103); Among them, the first specification size is the size of the rubber particles after the waste tire raw materials are preliminarily crushed; Suppose the real-time size of the rubber particles detected by the optoelectronic sensing module (12) is , , then the rate of gas circulation of the cooling mechanism (7) is , where is the gas circulation rate is a parametric function of , is is a parametric function of; S3. While the cooling mechanism (7) is started, the electromagnetic control mechanism (9) is started, and the electromagnetic control mechanism (9) controls the electromagnetic power of the electromagnet (10) to be , and the electromagnet (10) performs periodic electromagnetic attraction on the rubber block containing iron wire; Among them, is a preset standard current intensity, is a time parameter, is related to a coefficient negatively correlated with, is related to a coefficient positively correlated with; S4. Shutdown condition: when the photoelectric sensing module (12) detects that the size of the rubber particles is smaller than the preset second specification size , ; Then the delay module of the control system is started. If the sizes of the rubber particles all meet the above shutdown conditions during the delay stage, after the delay module ends, the control system determines that the crushing process is completed and the entire equipment shuts down.

2. A tire crushing device for pyrolysis of waste tires, used for the tire crushing method for pyrolysis of waste tires described in claim 1, characterized in that: It includes a tank body (1), a rotating shaft tube (4) located inside the tank body (1), a crushing blade (401) fixedly connected to the rotating shaft tube (4), and a motor (3) driving the rotating shaft tube (4) to rotate, characterized in that: An inner lining steel sleeve (5) sleeved outside the crushing blade (401) is arranged in the inner cavity of the tank body (1). A crushing cavity (103) is formed inside the inner lining steel sleeve (5), and an annular side air gap (6) is formed between the inner lining steel sleeve (5) and the inner wall of the tank body (1); Among them, a plurality of air inlet conical grooves (501) are arranged on one side of the inner lining steel sleeve (5) facing the annular side air gap (6), and a plurality of air outlet conical grooves (503) are arranged on the side facing the crushing cavity (103). Ventilation holes (502) are opened between the air inlet conical grooves (501) and the air outlet conical grooves (503); A cylindrical electromagnetic body (10) is arranged inside the rotating shaft tube (4), an electromagnetic control mechanism (9) is arranged above the tank body (1), and the electromagnetic control mechanism (9) is equipped with a brush module (901) electrically connected to the electromagnetic body (10); A photoelectric sensor module (12) for sensing and detecting the real-time size of rubber particles in the crushing cavity (103) is arranged on the top side of the tank body (1); A cooling mechanism (7) is arranged above the tank body (1). The air inlet end of the cooling mechanism (7) is communicated with the crushing cavity (103), and the air outlet end of the cooling mechanism (7) is communicated with the annular side air gap (6).

3. According to the tire crushing device for pyrolysis of waste tires described in claim 2, characterized in that: A bracket (2) is fixedly arranged at the bottom of the tank body (1), the motor (3) is installed at the crossbar position of the bracket (2), the output shaft of the motor (3) faces upward and passes through the bottom of the tank body (1), and the output shaft of the motor (3) is fixedly connected to the rotating shaft tube (4).

4. According to the tire crushing device for pyrolysis of waste tires described in claim 2, characterized in that: The rotating shaft tube (4) adopts an austenitic stainless steel tube body, and a top shaft sleeve (108) rotatably connected to the rotating shaft tube (4) is arranged at the top of the tank body (1).

5. According to the tire crushing device for pyrolysis of waste tires described in claim 2, characterized in that: The size of the ventilation hole (502) is smaller than the size of the rubber particles after reaching the crushing standard.

6. According to the tire crushing device for pyrolysis of waste tires described in claim 2, characterized in that: A plurality of diversion openings (504) are provided at the bottom of the inner lining steel sleeve (5). The tank body (1) is provided with a diversion slope (106) located at the bottom of the annular side air gap (6) and a drainage slope (107) located at the bottom of the crushing chamber (103). The diversion slope (106) is inclined downward toward the diversion opening (504), and the drainage slope (107) is inclined upward toward the rotating shaft tube (4).

7. The tire crushing device for waste tire cracking according to claim 2, wherein: The tank body (1) is provided with a top cover (104), and a filter element (105) communicating with the air inlet end of the cooling mechanism (7) is embedded in the top cover (104).

8. The tire crushing device for waste tire cracking according to claim 2, wherein: The cooling mechanism (7) is configured with a circulation pump (701) for sucking air flow, a cooling chamber (702) for cooling the air flow, and a temperature monitoring module (703) for monitoring the temperature of the air flow entering the cooling chamber (702); A gas supply pipe (8) is arranged between the cooling chamber (702) of the cooling mechanism (7) and the annular side air gap (6) of the tank body (1).

9. The tire crushing device for waste tire cracking according to claim 8, wherein: The gas outlet direction of the gas supply pipe (8) toward the annular side air gap (6) is tangent to the wall surface of the tank body (1).

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