Cold insulation system and cold insulation method for LNG discharging pipeline
By designing an automated LNG unloading pipeline cooling system, using low-temperature medium circulation and temperature differential power generation sheets to generate power, the problem of unloading pipelines in the prior art cannot be effectively cooled, and efficient cooling energy utilization and energy consumption savings are achieved.
Patent Information
- Application Number
- CN202411434496.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2024-12-31
AI Technical Summary
The existing LNG discharge pipe cannot effectively keep cooling when not in use, resulting in additional cooling operations required, and the nitrogen purge structure installed on the top of the discharge arm is inconvenient for disassembly, increasing power consumption during movement and rotation.
A cooling system including unloading pipes, connectors, electrical control valves and medium supply components is designed. It realizes automatic medium circulation through components such as casing, clamping plates, inflatable airbags, refrigeration compressors and temperature differential power generators, and utilizes low temperatures. The medium is kept cold and the cooling energy is stored through the temperature differential power generator.
It realizes convenient installation and disassembly of unloading pipelines, reduces manual intervention, improves work efficiency, efficiently utilizes medium circulation, saves resource and energy consumption, and further improves the energy efficiency of the system through cold energy generation.
Smart Images
Figure CN119222419A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of cold preservation of LNG pipelines, and in particular relates to a cold preservation system and a cold preservation method for LNG unloading pipelines. Background Art
[0002] Natural gas is a clean energy composed of hydrocarbons. It is increasingly widely used due to its clean combustion and high calorific value. In order to facilitate the transportation of natural gas, it is generally transported as a liquid. The volume of liquefied natural gas (LNG) is about 1 / 620 of its gaseous volume. The main components (%, molar): CH4 85-90, C2H6 3-8, C3H8 1-3, C4H101-2, C+5 trace. The latent heat of vaporization of LNG when regasified (about -162℃) is about 511 kJ / kg.
[0003] However, LNG utilization is a chain system project with huge investment and close links between upstream and downstream links. It consists of six links: natural gas extraction, natural gas liquefaction, LNG transportation, LNG reception and gasification, natural gas transmission pipelines, and natural gas end users. Figure 1 As shown. If any problem occurs in any link, the entire system will be shut down, and huge compensation must be made to the upstream and downstream links. Therefore, the process and equipment of each link in the use of LNG must be safe and reliable. The LNG receiving station is one of the important links, and the requirements are more stringent.
[0004] The general receiving station process can be divided into three main systems: LNG unloading system, LNG storage system, and LNG export system. The receiving station unloading system is generally equipped with four unloading arms on the dock, three of which are used to transport liquids and the last one is used to transport gas. One of the liquid unloading arms Y is a mixed type. If the gas transport arm fails, the mixing arm can be used as a gas reflux arm, and the unloading is carried out at a lower speed. LNG is discharged from the ship's cabin through the unloading pump on the ship. The unloading is carried out through three unloading arms, and the LNG is transported to the LNG storage tank on the shore through the unloading pipeline and the recirculation pipeline.
[0005] After the unloading operation is completed and before the arm is disconnected, the unloading arm is emptied and working nitrogen is supplied to the top of the arm for purging. However, the existing nitrogen purging only has the function of emptying the unloading arm, and cannot keep the unloading arm cold when it is not in use. Therefore, the unloading arm needs to be cooled before the next use, and additional functions are required to meet the needs. In addition, the nitrogen purging structure is installed on the top of the unloading arm, which is not convenient to disassemble. When the unloading arm is moved or rotated, additional power consumption is required. Summary of the invention
[0006] The purpose of the present invention is to provide a cold preservation system for LNG unloading pipelines, which is easy to install and disassemble, fully reduces manual intervention, has a high degree of automation, improves work efficiency, and has a high medium recycling rate. The remaining cold energy can be stored and fully utilized, saving resources and energy consumption.
[0007] To achieve the above object, the present invention provides the following technical solutions: A cold preservation system for an LNG unloading pipeline comprises a unloading pipeline, a connector, and an electric control valve. One end of the connector is bolted to the unloading pipeline, and the other end is connected to a butt pipe. The electric control valve is screwed on the unloading pipeline. The electric control valve and the connector are respectively fixed at both ends of the unloading pipeline. A butt pipe is detachably connected to a butt assembly. One end of the butt assembly away from the butt pipe is connected to a medium supply assembly. The end of the unloading pipeline away from the connector is connected to a recovery assembly. The other end of the recovery assembly is communicated with the medium supply assembly. The medium supply assembly guides the medium into the butt pipe along the butt assembly, and the medium returns to the inside of the medium supply assembly through the unloading pipeline and the recovery assembly.
[0008] Preferably, the docking assembly includes a sleeve and an entry pipe, one end of the sleeve is slidably connected to two clamping plates, the two clamping plates are semi-circular, and when the two clamping plates are closed, they can fit together with the outer side of the docking pipe to form a sealed circular shape. A connecting frame is provided inside the sleeve, and one end of the entry pipe is fixed in the sleeve through the connecting frame.
[0009] Preferably, an annular inflatable airbag is fixed on the outer wall of the inlet pipe in the sleeve, and an air inlet valve is installed on the inflatable airbag.
[0010] Preferably, vertical rods are fixed on the two clamping plates, the vertical rods slide inside the sleeve, the upper ends of the vertical rods extend out of the sleeve, one end of the vertical rods is connected to a cylinder, and the cylinder screws are installed on the outer wall of the sleeve.
[0011] Preferably, the medium supply assembly includes a refrigeration compressor, and an electric three-way valve is installed on the inlet pipe, the electric three-way valve is connected to a connecting pipe and a medium inlet pipe at an end away from the inlet pipe, and the other end of the medium inlet pipe is connected to a telescopic pipe, and the telescopic pipe is connected to the outlet of the refrigeration compressor away from the end of the medium inlet pipe, and the inlet of the refrigeration compressor is connected to a medium storage box, and an electric pump is provided between the medium storage box and the refrigeration compressor.
[0012] Preferably, a box body is provided on the outside of the refrigeration compressor, an opening is provided at the upper end of the box body, a T-shaped pipe sleeve is rotatably connected inside the opening, the telescopic pipe is flange-connected to the T-shaped pipe sleeve, a heat dissipation grille is provided on one side of the box body, a control panel is screwed to the other side, and a number of electric wheels are screwed on the bottom of the box body.
[0013] Preferably, the recovery component includes a recovery pipe flange-connected to a discharge pipe, a solenoid valve is fixed at the connection between the recovery pipe and the discharge pipe, the recovery pipe is connected to a medium storage box away from the discharge pipe end, and a cold energy utilization component is also provided outside the recovery pipe.
[0014] Preferably, the cold energy utilization component comprises a temperature difference power generation sheet wrapped around the outside of the recovery pipe, the temperature difference power generation sheet is connected in series with a diode, and a battery is connected in series to an amplifying end of the diode.
[0015] The present application also provides a cold preservation method for a LNG receiving station transmission pipeline, which uses the above-mentioned cold preservation system for LNG unloading pipelines. The method is easy to operate and realizes full-process automated medium circulation, and includes the following steps: S1. After the unloading is completed, close the electric control valve at the end of the unloading pipe, move the box to the bottom of the target connector, pull the electric three-way valve, align the sleeve with the butt joint along the axis, and insert it into the outside of the butt joint; S2, open the cylinder, the cylinder drives the vertical rod to move, and drives the two clamping plates to move toward the butt joint tube. As the cylinder continues to drive, the two clamping plates overlap and wrap around the outside of the butt joint tube, and at the same time, the clamping plates collide with the outside of the butt joint tube; S3, simultaneously opening the air inlet valve to inflate the airbag. After inflation, the airbag fills the space between the inlet pipe and the butt pipe 21, and the space reaches a sealed state. S4. Open the electric three-way valve to keep the medium inlet pipeline connected to the inlet pipeline, and open the solenoid valve to keep the discharge pipeline connected to the recovery pipeline; S5, turn on the electric pump at the same time, drive the medium in the medium storage box to flow along the discharge pipe to the recovery pipe after being cooled by the refrigeration compressor, and finally return to the medium storage box to form a cycle; S6. The medium enters the recovery pipe through the discharge pipe. When passing through the thermoelectric power generation plate, it exchanges heat with the thermoelectric power generation plate. Temperature is generated on both sides of the thermoelectric power generation plate, and current is generated inside the thermoelectric power generation plate. The current is stored in the battery.
[0016] The beneficial effects of the present invention are: This system uses a box to transport the refrigeration compressor. The electric wheels at the bottom of the box can be used to move between different unloading pipes inside the LNG receiving station. The entry pipe and the butt pipe are connected by a sleeve, which is convenient for installation and disassembly. The butt pipe can be fixed by controlling two clamping plates with a cylinder. The entry pipe and the butt pipe can be sealed by an inflatable airbag to avoid leakage, reduce manual intervention, and improve work efficiency. 2. This system is equipped with a medium supply component and a recovery component. The flow of low-temperature medium keeps the pipeline cold after the unloading switch, which is convenient for operation. The medium circulates in the pipeline with high utilization rate. The cold energy of the medium can also be used to generate electricity, making full use of it and saving resources and energy consumption. 3. The cold preservation method adopts the above-mentioned cold preservation system for LNG unloading pipeline. The method is easy to operate and realizes full-process automated medium circulation. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 is a system diagram of the present invention; Figure 2 It is a schematic diagram of the structure between the box body and the discharge pipe in the present invention; Figure 3 yes Figure 2 State diagram of the docking assembly being separated; Figure 4 yes Figure 2 Schematic diagram of the structure from a side view; Figure 5 yes Figure 3 A partial enlarged view of the middle part; Figure 6 is a cross-sectional view of the docking assembly; Figure 7 It is a schematic diagram of the process steps of the cold preservation method of the present invention.
[0018] In the figure: 1. discharge pipe; 2. connector; 21. butt joint pipe; 3. electric control valve; 4. butt joint assembly; 5. medium supply assembly; 6. recovery assembly; 401. sleeve; 402. clamping plate; 403. connecting frame; 404. entry pipe; 405. inflatable airbag; 406. intake valve; 407. vertical rod; 408. cylinder; 409. electric three-way valve; 410. connecting pipe; 411. medium entry pipe; 412. telescopic pipe; 501. refrigeration compressor; 502. medium storage box; 503. electric pump; 504. box body; 505. opening; 506. T-type pipe sleeve; 507. heat dissipation grille; 508. control panel; 509. electric wheel; 601. recovery pipe; 602. solenoid valve; 603. temperature difference power generation sheet. DETAILED DESCRIPTION
[0019] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings.
[0020] refer to Figures 1 to 7The following will describe in detail the cold preservation system for the LNG unloading pipeline according to an embodiment of the present invention in conjunction with the accompanying drawings. In this embodiment, the unloading pipeline 1, the connector 2 and the butt joint 21 are all conventional structures used in existing LNG receiving stations. The system is applied to the unloading pipeline 1 to keep the unloading pipeline 1 cold after the unloading is completed.
[0021] like Figure 1 As shown, the cold preservation system for the LNG unloading pipeline includes a unloading pipeline 1, a connector 2, and an electric control valve 3. One end of the connector 2 is bolted to the unloading pipeline 1, and the other end is connected to a butt joint 21. The electric control valve 3 is screwed on the unloading pipeline 1, and the electric control valve 3 and the connector 2 are respectively fixed at both ends of the unloading pipeline 1. It is characterized in that a docking component 4 is detachably connected to the butt joint 21, and the end of the butt joint 21 is connected to a medium supply component 5, and the end of the unloading pipeline 1 away from the connector 2 is connected to a recovery component 6, and the other end of the recovery component 6 is connected to the medium supply component 5. The medium supply component 5 exports the medium along the docking component 4 into the butt joint 21, and the medium returns to the inside of the medium supply component 5 through the unloading pipeline 1 and the recovery component 6.
[0022] Among them, the docking component 4 includes a sleeve 401 and an entry pipe 404. One end of the sleeve 401 is connected to two clamping plates 402 for sliding up and down. The two clamping plates 402 are in a semicircular shape. When the two clamping plates 402 are closed, they can fit together with the outer side of the docking pipe 21 to form a sealed circular shape. A connecting frame 403 is provided inside the sleeve 401. One end of the entry pipe 404 is fixed in the sleeve 401 through the connecting frame 403. Vertical rods 407 are fixed on the two clamping plates 402. The vertical rods 407 slide inside the sleeve 401. The upper end of the vertical rod 407 extends out of the sleeve 401. One end of the vertical rod 407 is connected to a cylinder 408. The cylinder 408 is screwed on the outer wall of the sleeve 401.
[0023] In addition, an inflatable airbag 405 is fixed to the outer wall of the inlet pipe 404, and an air intake valve 406 is installed on the inflatable airbag 405. The air intake valve 406 is connected to an external inflation device through a pipe.
[0024] When receiving LNG, the discharge pipeline 1 is connected to the transport pipeline on the LNG ship to transport the LNG to the receiving station. After receiving, the pipeline is switched. After switching the pipeline, the sleeve 401 in this embodiment is fixed to the butt pipe 21 of the connector 2 to keep the discharge pipeline 1 cold. The sleeve 401 is fixed by two clamping plates 402 and annular inflatable airbags 405. Since the discharge pipeline 1 of the LNG receiving station is provided with multiple, the movable box 504 is driven and controlled by the electric wheel 509 at the bottom thereof. The box 504 is moved to the bottom of the target connector 2, and the electric three-way valve is pulled to close the sleeve 401. 01 align the butt joint tube 21 along the axis, and the movable sleeve 401 is sleeved on the outside of the butt joint tube 21. After the sleeve 401 is sleeved, by opening the cylinder 408, the cylinder 408 drives the vertical rod 407 to move, and the two clamping plates 402 move under the drive of the vertical rod 407. With the continuous output of the cylinder 408, the two clamping plates 402 overlap and are clamped on the outside of the butt joint tube 21. At the same time, the air inlet valve 406 is opened, and the inflatable airbag 405 is inflated by an external inflation device. After inflation, the space between the pipe 404 and the butt joint tube 21 is filled with the inflatable airbag 405 to avoid leakage after the subsequent medium is introduced and improve the density.
[0025] In this embodiment, the medium supply component 5 includes a refrigeration compressor 501, and an electric three-way valve 409 is installed on the inlet pipe 404. The electric three-way valve 409 is respectively connected to a connecting pipe 410 and a medium inlet pipe 411 at the end away from the inlet pipe 404. The other end of the medium inlet pipe 411 is connected to a telescopic pipe 412. The telescopic pipe 412 is connected to the outlet of the refrigeration compressor 501 at the end away from the medium inlet pipe 411. The inlet of the refrigeration compressor 501 is connected to a medium storage box 502, and an electric pump 503 is provided between the medium storage box 502 and the refrigeration compressor 501.
[0026] A box body 504 is provided outside the refrigeration compressor 501, an opening 505 is provided at the upper end of the box body 504, a T-shaped pipe sleeve 506 is rotatably connected inside the opening 505, the telescopic pipe 412 is flange-connected to the T-shaped pipe sleeve 506, a heat dissipation grille 507 is provided on one side of the box body 504, a control panel 508 is screwed to the other side, and a plurality of electric wheels 509 are screwed to the bottom of the box body 504.
[0027] After the sleeve 401 is installed and fixed, the inlet pipe 404 of the electric three-way valve 409 is controlled to be connected with the medium inlet pipe 411, and then the electric pump 503 is turned on. After the electric pump 503 is turned on, the medium inside the medium storage box 502 is passed into the inlet port of the refrigeration compressor 501. After the refrigeration of the refrigeration compressor 501, as the electric pump 503 continues to work, the low-temperature medium is continuously introduced into the medium inlet pipe 411 along the telescopic pipe 412, and then enters the discharge pipe 1 through the inlet pipe 404 and the docking pipe 21, so as to keep the discharge pipe 1 cold.
[0028] The control buttons of the cylinder 408 and the gas valve are integrated on the control panel 508, and the electric wheel 509, the cylinder 408, the refrigeration compressor 501, the electric pump 503 and other electrical equipment are all connected to an external power supply.
[0029] In this embodiment, the recovery component 6 includes a recovery pipe 601 flange-connected to the discharge pipe 1, a solenoid valve 602 is fixed at the connection between the recovery pipe 601 and the discharge pipe 1, the recovery pipe 601 is connected to the medium storage box 502 at the end away from the discharge pipe 1, and a cold energy utilization component is also provided on the outside of the recovery pipe 601.
[0030] The cold energy utilization component includes a temperature difference power generation sheet 603 wrapped around the outside of the recovery pipe 601, the temperature difference power generation sheet 603 is connected in series with a diode, and the amplifying end of the diode is connected in series with a battery.
[0031] After the low-temperature medium enters the discharge pipeline 1, the electric control valve 3 is controlled to close the discharge pipeline 1 and connect it to the storage pipeline in the receiving station. The recovery pipeline 601 and the discharge pipeline 1 are connected by controlling the solenoid valve 602. The medium after entering the discharge pipeline 1 flows along the recovery pipeline 601. When passing through the thermoelectric power generation sheet 603, current is generated at the thermoelectric power generation sheet 603. After passing through the diode circuit, the current can be collected and stored in the battery; the medium passing through the thermoelectric power generation sheet 603 continues to flow to the medium storage box for recycling.
[0032] The medium may be an inert gas such as nitrogen or argon.
[0033] Based on the aforementioned cold preservation system for LNG unloading pipeline, such as Figure 7 As shown, the cold preservation method of the LNG receiving station transmission pipeline specifically includes the following steps: S1. After the unloading is completed, close the electric control valve 3 at the end of the unloading pipe 1, move the box 504 to the bottom of the target connector 2, pull the electric three-way valve 409, align the sleeve 401 with the butt joint 21 along the axis, and insert it into the outside of the butt joint 21; S2, open the cylinder 408, the cylinder 408 drives the vertical rod 407 to move, driving the two clamping plates 402 to move toward the butt joint tube 21. As the cylinder 408 continues to drive, the two clamping plates 402 overlap and wrap around the outside of the butt joint tube 21, and at the same time, the clamping plates 402 contact the outside of the butt joint tube 21; S3, simultaneously opening the air inlet valve 406 to inflate the inflatable airbag 405. After the inflating, the air between the pipe 404 and the butt pipe 21 is filled with the inflatable airbag 405 to achieve a sealed state; S4, open the electric three-way valve 409 to keep the medium inlet pipe 411 connected with the inlet pipe 404, and open the solenoid valve 602 to keep the discharge pipe 1 connected with the recovery pipe 601; S5, simultaneously turn on the electric pump 503, drive the medium in the medium storage box 502 to flow along the discharge pipe 1 to the recovery pipe 601 after being refrigerated by the refrigeration compressor 501, and finally return to the medium storage box 502, forming a cycle; S6. The medium enters the recovery pipe 601 through the unloading pipe 1. When passing through the thermoelectric power generation plate 603, it exchanges heat with the thermoelectric power generation plate 603. Temperature is generated on both sides of the thermoelectric power generation plate 603, and current is generated inside the thermoelectric power generation plate 603. The current is stored in the battery.
Claims
1. A cold preservation system for an LNG unloading pipeline, comprising an unloading pipeline (1), a connector (2), and an electric control valve (3), wherein one end of the connector (2) is bolted to the unloading pipeline (1), and the other end is connected to a butt joint (21), the electric control valve (3) is screwed to the unloading pipeline (1), and the electric control valve (3) and the connector (2) are respectively fixed to the two ends of the unloading pipeline (1), characterized in that: The butt joint pipe (21) is detachably connected to a butt joint assembly (4); one end of the butt joint assembly (4) away from the butt joint pipe (21) is connected to a medium supply assembly (5); the end of the discharge pipe (1) away from the connector (2) is connected to a recovery assembly (6); the other end of the recovery assembly (6) is in communication with the medium supply assembly (5); the medium supply assembly (5) guides the medium along the butt joint assembly (4) into the butt joint pipe (21); and the medium returns to the inside of the medium supply assembly (5) through the discharge pipe (1) and the recovery assembly (6).
2. A cold preservation system for LNG unloading pipeline according to claim 1, characterized in that: The docking assembly (4) comprises a sleeve (401) and an inlet pipe (404); one end of the sleeve (401) is slidably connected to two clamping plates (402) in an up-and-down manner; the two clamping plates (402) are in a semicircular ring shape; when the two clamping plates (402) are closed, they can fit with the outer side of the docking pipe (21) to form a sealed circular ring shape; a connecting frame (403) is provided inside the sleeve (401); one end of the inlet pipe (404) is fixed in the sleeve (401) through the connecting frame (403).
3. A cold preservation system for LNG unloading pipeline according to claim 2, characterized in that: An annular inflatable airbag (405) is fixed on the outer wall of the inlet pipe (404) located in the sleeve (401), and an air inlet valve (406) is installed on the inflatable airbag (405).
4. A cold preservation system for LNG unloading pipeline according to claim 3, characterized in that: A vertical rod (407) is fixed on each of the two clamping plates (402). The vertical rod (407) slides inside the sleeve (401). The upper end of the vertical rod (407) extends out of the sleeve (401). One end of the vertical rod (407) is connected to a cylinder (408). The cylinder (408) is screwed onto the outer wall of the sleeve (401).
5. A cold preservation system for LNG unloading pipeline according to claim 4, characterized in that: The medium supply assembly (5) comprises a refrigeration compressor (501), an electric three-way valve (409) is installed on the inlet pipe (404), the end of the electric three-way valve (409) away from the inlet pipe (404) is respectively connected to a connecting pipe (410) and a medium inlet pipe (411), the other end of the medium inlet pipe (411) is connected to a telescopic pipe (412), the end of the telescopic pipe (412) away from the medium inlet pipe (411) is connected to the outlet of the refrigeration compressor (501), the inlet of the refrigeration compressor (501) is connected to a medium storage box (502), and an electric pump (503) is provided between the medium storage box (502) and the refrigeration compressor (501).
6. A cold preservation system for LNG unloading pipeline according to claim 5, characterized in that: The refrigeration compressor (501) is provided with a box body (504) on the outside, an opening (505) is provided at the upper end of the box body (504), a T-shaped pipe sleeve (506) is rotatably connected inside the opening (505), the telescopic pipe (412) is flange-connected to the T-shaped pipe sleeve (506), a heat dissipation grille (507) is provided on one side of the box body (504), a control panel (508) is screw-fixed on the other side, and a plurality of electric wheels (509) are screw-mounted on the bottom of the box body (504).
7. A cold preservation system for LNG unloading pipeline according to claim 6, characterized in that: The recovery component (6) comprises a recovery pipe (601) connected to the discharge pipe (1) by a flange, a solenoid valve (602) being fixed at the connection between the recovery pipe (601) and the discharge pipe (1), the recovery pipe (601) being connected to the medium storage box (502) at the end away from the discharge pipe (1), and a cold energy utilization component being further provided on the outside of the recovery pipe (601).
8. A cold preservation system for LNG unloading pipeline according to claim 7, characterized in that: The cold energy utilization component comprises a temperature difference power generation sheet (603) coated on the outside of the recovery pipe (601), the temperature difference power generation sheet (603) is connected in series with a diode, and the amplifying end of the diode is connected in series with a storage battery.
9. A method for cold preservation of a LNG receiving station transmission pipeline, using the cold preservation system for LNG unloading pipelines in claim 8, characterized in that: The following steps are involved: S1. After the unloading is completed, close the electric control valve at the end of the unloading pipe, move the box to the bottom of the target connector, pull the electric three-way valve, align the sleeve with the butt joint along the axis, and insert it into the outside of the butt joint; S2, open the cylinder, the cylinder drives the vertical rod to move, and drives the two clamping plates to move toward the butt joint tube. As the cylinder continues to drive, the two clamping plates overlap and wrap around the outside of the butt joint tube, and at the same time, the clamping plates collide with the outside of the butt joint tube; S3, simultaneously opening the air inlet valve to inflate the inflatable airbag 405. After the inflatable airbag 405 enters the space between the pipe 404 and the butt pipe 21, the inflatable airbag 405 is filled to a full state, and the airbag 405 is sealed. S4. Open the electric three-way valve to keep the medium inlet pipeline connected with the inlet pipeline, and open the solenoid valve to keep the discharge pipeline connected with the recovery pipeline; S5, turn on the electric pump at the same time, drive the medium in the medium storage box to flow along the discharge pipe to the recovery pipe after being cooled by the refrigeration compressor, and finally return to the medium storage box to form a cycle; S6. The medium enters the recovery pipe through the discharge pipe. When passing through the thermoelectric power generation plate, it exchanges heat with the thermoelectric power generation plate. Temperature is generated on both sides of the thermoelectric power generation plate, and current is generated inside the thermoelectric power generation plate. The current is stored in the battery.