Purification system for lithium battery liquid injection and high-temperature formation workshop gas

Abstract

The utility model discloses a purification system for lithium battery liquid injection and high-temperature formation workshop gas, and belongs to the technical field of gas purification. Comprising an inlet air collecting mechanism, a connecting vacuum pump, a liquid injection workshop and a high-temperature formation workshop, the gas purification mechanism is connected with the inlet air collection mechanism, and the gas purification mechanism comprises a first purification assembly used for adsorbing first harmful substances in gas; the second purification assembly is connected with the first purification assembly and is used for removing second harmful substances in the gas; the temperature and pressure control mechanism is connected with the gas purification mechanism, and the temperature and pressure control mechanism comprises a condensation assembly connected with the liquid injection workshop; and the heating assembly is connected with the high-temperature formation workshop. The technical scheme has the beneficial effects that gas in all workshops can be effectively collected through the inlet air collecting mechanism, pollutant diffusion is prevented, the control process is simple, and through cooperation of the purification assembly and the temperature and pressure control mechanism, gas recycling is achieved, and workshop environment management and control energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gas purification, in particular to a purification system for gases in a lithium battery liquid injection and high-temperature formation workshop. Background Art

[0002] With the increasing demand for environmental protection and the intensifying energy tension, the demand for power batteries has shown an explosive growth. With the progress of technology, power batteries have improved in terms of safety and performance, but their manufacturing costs have always remained high, which is still one of the key factors affecting the development of power batteries.

[0003] Currently, the battery production business mainly includes two sectors: battery cells and PACK (battery packs). Among the many processes of battery production, as an important component of the battery, the main components of the electrolyte are propylene carbonate, ethyl methyl carbonate, ethylene carbonate, vinylene carbonate, hydrogen fluoride, etc. Harmful substances such as VOC (volatile organic compounds) and trace fluorides (fluorides) will inevitably be generated during the battery liquid injection and high-temperature formation processes.

[0004] The existing process cannot ensure that the pollutants in the workshop are completely collected. Especially in the liquid injection workshop and inside the liquid injection machine, the pollutants are likely to spread to other areas of the workshop without being effectively collected. At the same time, the treated gas is directly discharged to the outside. Although these gases have become clean and dry after being treated by a dehumidifier and air conditioner, direct discharge will cause the dehumidifier to require additional fresh air, thus increasing the scale of the dehumidifier and the energy consumption for treating fresh air. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a purification system for gases in a lithium battery liquid injection and high-temperature formation workshop to solve the above technical problems;

[0006] A purification system for gases in a lithium battery liquid injection and high-temperature formation workshop includes:

[0007] An air inlet collection mechanism, connected to a vacuum pump, a liquid injection workshop, and a high-temperature formation workshop;

[0008] A gas purification mechanism, connected to the air inlet collection mechanism, and the gas purification mechanism includes:

[0009] A first purification component, used to adsorb the first harmful substance in the gas;

[0010] A second purification component, connected to the first purification component, used to remove the second harmful substance in the gas;

[0011] A temperature and pressure control mechanism, connected to the gas purification mechanism, and the temperature and pressure control mechanism includes:

[0012] A condensation component, connected to the liquid injection workshop;

[0013] A heating component, connected to the high-temperature formation workshop.

[0014] Preferably, the air inlet collection mechanism includes

[0015] A first gas collection pipeline, connected to the vacuum pump;

[0016] A second gas collection pipeline, connected to the top opening of the liquid injection machine in the liquid injection workshop;

[0017] A third gas collection pipeline, connected to the collection louvers at the top of the high-temperature formation workshop;

[0018] A pipeline joint, the first end of the pipeline joint is connected to the first gas collection pipeline, the second end of the pipeline joint is connected to the second gas collection pipeline, the third end of the pipeline joint is connected to the third gas collection pipeline, and the fourth end of the pipeline joint is connected to the gas purification mechanism.

[0019] Preferably, the air inlet collection mechanism pumps the air in the liquid injection workshop at a rate of 6 to 12 times the volume of the liquid injection machine per hour;

[0020] The air inlet collection mechanism pumps the air in the high-temperature formation workshop at a rate of 3 to 6 times the volume of the high-temperature formation workshop per hour.

[0021] Preferably, the first purification component includes

[0022] A basic absorber, in which alumina filler is provided for removing the first harmful substance;

[0023] A dry filter, connected to the output end of the basic absorber;

[0024] A first fan, connected to the output end of the dry filter.

[0025] Preferably, the second purification component includes

[0026] A rotating wheel, the recovery area of the rotating wheel is connected to the first output end of the first fan, and the cooling area of the rotating wheel is connected to the second output end of the first fan;

[0027] A first heat exchanger, the first input end of the first heat exchanger is connected to the cooling area, and the first output end of the first heat exchanger is connected to the desorption area of the rotating wheel;

[0028] A second fan, the input end of the second fan is connected to the desorption area;

[0029] A second heat exchanger, the first input end of the second heat exchanger is connected to the output end of the second fan;

[0030] The first heater, the input end of the first heater is connected to the first output end of the second heat exchanger;

[0031] The catalytic oxidation furnace, the input end of the catalytic oxidation furnace is connected to the output end of the first heater, and the output end of the catalytic oxidation furnace is connected to the second input end of the first heat exchanger;

[0032] The second output end of the first heat exchanger is connected to the second input end of the second heat exchanger, and the second output end of the second heat exchanger is used to exhaust waste gas.

[0033] Preferably, the condensation assembly includes,

[0034] The surface cooler, which is connected between the chilled water heat exchange pipelines;

[0035] The first filter, the input end of the first filter is connected to the output end of the surface cooler, and the output end of the first filter is connected to the liquid injection workshop.

[0036] Preferably, the heating assembly includes,

[0037] The second heater;

[0038] The second filter, the input end of the second filter is connected to the output end of the second heater, and the output end of the second filter is connected to the high-temperature forming workshop.

[0039] Preferably, the air pressure in the high-temperature forming workshop is greater than the air pressure in the liquid injection workshop, and the pressure difference between the high-temperature forming workshop and the liquid injection workshop is 5 Pa.

[0040] Preferably, the temperature and pressure control mechanism further includes a damper for distributing air volume, which is connected to the first differential pressure gauge in the liquid injection workshop and the second differential pressure gauge in the high-temperature forming workshop.

[0041] Preferably, the temperature of the gas cooled by the condensation assembly is 18°C to 28°C, and the temperature of the gas heated by the heating assembly is 38°C to 48°C.

[0042] The beneficial effects of the present invention are as follows: The air inlet collection mechanism can effectively collect the gas in each workshop, prevent the diffusion of pollutants, and the control process is simple. Through the cooperation of the purification assembly and the temperature and pressure control mechanism, the gas can be recycled and reused, reducing the energy consumption of the workshop environmental control. Description of the Drawings

[0043] Figure 1 It is a schematic diagram of the purification system for the gas in the lithium battery liquid injection and high-temperature forming workshops of the present invention;

[0044] Figure 2It is a schematic diagram of the connection between the air inlet collection mechanism of the present utility model and each workshop;

[0045] Figure 3 It is a schematic diagram of gas collection of a single liquid injection machine of the present utility model.

[0046] In the attached drawings: 1. Air inlet collection mechanism; 2. Gas purification mechanism; 21. First purification component; 211. Basic absorber; 212. Dry filter; 213. First fan; 22. Second purification component; 221. Rotor; 222. First heat exchanger; 223. Second fan; 224. Second heat exchanger; 225. First heater; 226. Catalytic oxidation furnace; 3. Temperature and pressure control mechanism; 31. Condensation component; 311. Surface cooler; 312. First filter; 313. Chilled water heat exchange pipeline; 32. Heating component; 321. Second heater; 322. Second filter; 4. First gas collection pipeline; 5. Second gas collection pipeline; 6. Third gas collection pipeline; 7. Pipeline joint; 8. Vacuum pump; 9. Liquid injection workshop; 10. High-temperature forming workshop; 11. Liquid injection machine. Detailed implementation manners

[0047] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the attached drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0048] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0049] Next, the present utility model will be further described in conjunction with the attached drawings and specific embodiments, but it is not limited to the present utility model.

[0050] A purification system for gases in a lithium battery liquid injection and high-temperature forming workshop, as Figure 1 , Figure 2 , Figure 3 shown, includes

[0051] An air inlet collection mechanism 1, connected to a vacuum pump 8, a liquid injection workshop 9, and a high-temperature forming workshop 10;

[0052] A gas purification mechanism 2, connected to the air inlet collection mechanism 1, and the gas purification mechanism 2 includes

[0053] A first purification component 21, used to adsorb the first harmful substances in the gas;

[0054] The second purification component 22 is connected to the first purification component 21 to remove the second harmful substance in the gas;

[0055] The temperature and pressure control mechanism 3 is connected to the gas purification mechanism 2. The temperature and pressure control mechanism 3 includes,

[0056] The condensation component 31 is connected to the liquid injection workshop 9;

[0057] The heating component 32 is connected to the high-temperature forming workshop 10.

[0058] Specifically, the present invention provides a purification system for the gas in the lithium battery liquid injection and high-temperature forming workshops. The air inlet collection mechanism 1 is respectively connected to the vacuum pump 8, the liquid injection workshop 9, and the high-temperature forming workshop 10, and effectively collects the gas in each workshop through pipelines, preventing the diffusion of pollutants. The control process is simple. The gas purification mechanism 2 and the temperature and pressure control mechanism 3 cooperate to realize the recycling of gas, thereby reducing the energy consumption of the workshop environmental control.

[0059] In a preferred embodiment, the air inlet collection mechanism 1 includes,

[0060] The first gas collection pipeline 4 is connected to the vacuum pump 8;

[0061] The second gas collection pipeline 5 is connected to the top opening of the liquid injector 11 in the liquid injection workshop 9;

[0062] The third gas collection pipeline 6 is connected to the collection louvers at the top of the high-temperature forming workshop 10;

[0063] The pipeline joint 7. The first end of the pipeline joint 7 is connected to the first gas collection pipeline 4, the second end of the pipeline joint 7 is connected to the second gas collection pipeline 5, the third end of the pipeline joint 7 is connected to the third gas collection pipeline 6, and the fourth end of the pipeline joint 7 is connected to the gas purification mechanism 2;

[0064] The air extraction volume of the air inlet collection mechanism 1 for the liquid injection workshop 9 per hour is 6 to 12 times the volume of the liquid injector 11;

[0065] The air extraction volume of the air inlet collection mechanism 1 for the high-temperature forming workshop 10 per hour is 3 to 6 times the volume of the high-temperature forming workshop 10.

[0066] Specifically, referring to Figure 1 the purple pipeline of the air inlet collection mechanism 1 in, the gas in each workshop is collected through multiple gas collection pipelines. When extracting gas, the negative pressure inside the liquid injector 11 is maintained to avoid the diffusion of high-concentration VOC gas inside to other areas of the workshop. The air extraction volume is calculated in advance according to the volume of the liquid injector 11. The high-temperature forming workshop 10 has evenly distributed louvers at the top to collect the workshop gas, and the air extraction volume is calculated in advance according to the volume of the workshop.

[0067] The liquid injection machine 11 adopts a box structure. There are 4 - 8 openings on the top of the liquid injection machine 11, and each opening faces the collection pipeline. The air extraction volume per hour reaches 6 - 12 times the volume of the liquid injection machine 11. Taking the high-temperature formation workshop 10 as a whole, collection louvers are installed on the top of the workshop. The number of louvers is 8 - 16, which are connected to the main collection pipe. The air extraction volume per hour reaches 3 - 6 times the volume of the workshop.

[0068] A valve is set, namely the pipeline joint 7. This valve is interlocked with the first fan 213 of the first purification component 21. The valve opens when the first fan 213 stops running, effectively preventing gas diffusion.

[0069] In a preferred embodiment, the first purification component 21 includes

[0070] An alkaline absorber 211, in which alumina filler for removing the first harmful substance is provided;

[0071] A dry filter 212, connected to the output end of the alkaline absorber 211;

[0072] A first fan 213, connected to the output end of the dry filter 212;

[0073] The second purification component 22 includes

[0074] A rotating wheel 221. The recovery area a of the rotating wheel 221 is connected to the first output end of the first fan 213, and the cooling area b of the rotating wheel 221 is connected to the second output end of the first fan 213;

[0075] A first heat exchanger 222. The first input end of the first heat exchanger 222 is connected to the cooling area b, and the first output end of the first heat exchanger 222 is connected to the desorption area c of the rotating wheel 221;

[0076] A second fan 223, the input end of which is connected to the desorption area c;

[0077] A second heat exchanger 224. The first input end of the second heat exchanger 224 is connected to the output end of the second fan 223;

[0078] A first heater 225, the input end of which is connected to the first output end of the second heat exchanger 224;

[0079] A catalytic oxidation furnace 226. The input end of the catalytic oxidation furnace 226 is connected to the output end of the first heater 225, and the output end of the catalytic oxidation furnace 226 is connected to the second input end of the first heat exchanger 222;

[0080] The second output end of the first heat exchanger 222 is connected to the second input end of the second heat exchanger 224, and the second output end of the second heat exchanger 224 is used to exhaust waste gas.

[0081] Specifically, the first harmful substance is HF, and the second harmful substance is VOC. The basic absorber 211 is used to remove HF, and the rotary wheel 221 and the CO burner (catalytic oxidation furnace 226) are VOC removal devices. The VOC is adsorbed by the rotary wheel 221 and then desorbed with 5%-10% of the intake air volume. After the gas collected by the air collection mechanism 1 is purified by the first purification component 21, 5%-10% of it is discharged outside the rotary wheel for desorption through the orange pipeline, and 90%-95% is returned to the workshop for reuse after being processed according to the purple pipeline.

[0082] In a preferred embodiment, the condensation component 31 includes

[0083] a surface cooler 311, which is connected between the chilled water heat exchange pipelines 313, and the chilled water heat exchange pipelines 313 are Figure 1 the green pipelines in

[0084] a first filter 312, the input end of the first filter 312 is connected to the output end of the surface cooler 311, and the output end of the first filter 312 is connected to the liquid injection workshop 9.

[0085] Specifically, the setting of the surface cooler 311 between the chilled water heat exchange pipelines 313 enables it to cool the gas using the low-temperature environment of the chilled water. After the gas undergoes condensation treatment, although the moisture has been removed, it may still contain solid particles. The setting of the first filter 312 ensures that these solid particles are removed, guaranteeing the gas cleanliness of the liquid injection workshop 9. The design and selection of the filter (such as the filtration pore size and material) need to consider the gas flow rate and the characteristics of the solid particles to achieve the purpose of effective filtration.

[0086] In a preferred embodiment, the heating component 32 includes

[0087] a second heater 321;

[0088] a second filter 322, the input end of the second filter 322 is connected to the output end of the second heater 321, and the output end of the second filter 322 is connected to the high-temperature forming workshop 10.

[0089] Specifically, heating can increase the gas temperature, and the second filter 322 can remove solid particles, chemical substances, or other residues in the heated gas. The design of the filter includes appropriate filter media and pore sizes to effectively capture particulate matter or chemical components of a specific size, ensuring that the gas is pure before entering the high-temperature forming workshop 10.

[0090] In a preferred embodiment, the air pressure in the high-temperature forming workshop 10 is greater than the air pressure in the liquid injection workshop 9, and the pressure difference between the high-temperature forming workshop 10 and the liquid injection workshop 9 is 5 Pa;

[0091] The temperature and pressure control mechanism 3 further includes a damper for distributing air volume, connecting a first differential pressure gauge in the liquid injection workshop 9 and a second differential pressure gauge in the high-temperature formation workshop 10.

[0092] Specifically, the differential pressure value interlocks with the real-time value inside the workshop. By controlling the damper, automatic adjustment is achieved to meet the differential pressure requirement.

[0093] In a preferred embodiment, the temperature of the gas after being cooled by the condensation component 31 is 18°C to 28°C, and the temperature of the gas after being heated by the heating component 32 is 38°C to 48°C.

[0094] Specifically, the temperature of the gas after being cooled by the condensation component 31 meets the temperature requirement of the liquid injection workshop 9, and the temperature of the gas after being heated by the heating component 32 meets the temperature requirement of the high-temperature formation workshop 10, and can be directly recycled, which is more environmentally friendly and energy-saving.

[0095] Specifically, the present invention relates to a process for collecting, purifying and recycling the gas in the liquid injection and high-temperature formation workshops 10 of lithium batteries and the exhaust gas of the corresponding vacuum pump 8. It does not require manual operation. According to the data obtained by each sensor, through PLC control, each system is interlocked to achieve fully automated operation. The inlet air pipeline is a single equipment and the internal collection pipeline of the workshop, the collected air volume is a multiple of the volume of the equipment and the workshop, the basic absorber 211 is an HF removal equipment, the VOC and HF removal system (gas purification mechanism 2) is a rotary wheel equipment and a CO combustion equipment, and the temperature and pressure control system (temperature and pressure control mechanism 3) is a gas return volume control and temperature regulation control system for the workshop, including condensation and heating units. It can solve the problem of VOC accumulation in the liquid injection and high-temperature formation workshops of lithium batteries. At the same time, the purified gas is returned to the workshop for reuse, greatly reducing the emission of clean gas in the workshop and achieving energy-saving effects.

[0096] More specifically, the cleanliness of the workshop gas is at the ten thousand level or higher, the dew point temperature is -40°C or lower, and the whole system is equipped with a high-efficiency processor; the inlet and return air pipelines can be made of PP material; the whole treatment system can be integrated in a box.

[0097] The temperature and pressure control system adjusts the temperature of the gas returned to the workshop by controlling the heater and the surface cooler 311 to meet the temperature requirement of the workshop, and at the same time effectively controls the differential pressure between workshops.

[0098] The heater can adopt electric heating or gas heating, and the surface cooler 311 uses chilled water (7°C to 12°C) for cooling.

[0099] Even more specifically, the present invention is integrated in a box. Compared with the traditional process, the whole equipment occupies a small area and is not restricted by height. At the same time, the whole set of equipment runs fully automatically by PLC, the control process is simple and convenient, and there is no need to configure additional personnel for separate operation. Only normal inspection is required, achieving the effect of saving time and effort.

[0100] The collection method of the liquid injection machine 11 adopts independent collection by a single device to maintain a negative pressure inside the liquid injection machine 11, thereby preventing VOC from diffusing into the workshop and being difficult to collect again.

[0101] It realizes the return of 90%-95% of the clean gas in the workshop to the workshop, greatly reducing the energy consumption for environmental control in the workshop.

[0102] The temperature and pressure control system directly controls the temperature and air volume returning to the workshop, realizing the function of effectively adjusting the pressure difference between the two workshops.

[0103] In summary, the present application provides a purification system for the gas in a lithium battery liquid injection and high-temperature forming workshop, aiming to remove VOC and HF in the gas. It includes a gas inlet collection system, a VOC and HF removal system, and a temperature control system. Compared with the prior art, the gas collection / processing process of the present utility model can completely solve the accumulation of VOC in the lithium battery liquid injection and high-temperature forming workshop 10, and at the same time, the purified gas is returned to the workshop for reuse, greatly reducing the emission of clean gas in the workshop, achieving an energy-saving effect, and being able to effectively adjust the pressure difference between the two workshops.

[0104] The above are only the preferred embodiments of the present utility model, and do not limit the implementation manners and protection scope of the present utility model accordingly. For those skilled in the art, it should be realized that any equivalent replacement and obvious changes made by using the description and illustrations of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A purification system for the gas in a lithium battery liquid injection and high-temperature formation workshop, characterized in that, including, an air inlet collection mechanism (1) connected to a vacuum pump (8), a liquid injection workshop (9), and a high-temperature forming workshop (10); a gas purification mechanism (2) connected to the air inlet collection mechanism (1), and the gas purification mechanism (2) includes, a first purification component (21) for adsorbing the first harmful substance in the gas; a second purification component (22) connected to the first purification component (21) for removing the second harmful substance in the gas; a temperature and pressure control mechanism (3) connected to the gas purification mechanism (2), and the temperature and pressure control mechanism (3) includes, a condensation component (31) connected to the liquid injection workshop (9); a heating component (32) connected to the high-temperature forming workshop (10).

2. The purification system for the gas in the lithium battery liquid injection and high-temperature formation workshop according to claim 1, wherein The air inlet collection mechanism (1) includes, a first gas collection pipeline (4) connected to the vacuum pump (8); a second gas collection pipeline (5) connected to the top opening of a liquid injection machine (11) in the liquid injection workshop (9); a third gas collection pipeline (6) connected to the collection louvers at the top of the high-temperature forming workshop (10); a pipeline joint (7), the first end of the pipeline joint (7) is connected to the first gas collection pipeline (4), the second end of the pipeline joint (7) is connected to the second gas collection pipeline (5), the third end of the pipeline joint (7) is connected to the third gas collection pipeline (6), and the fourth end of the pipeline joint (7) is connected to the gas purification mechanism (2).

3. The purification system for the gas in the lithium battery liquid injection and high-temperature formation workshop according to claim 2, wherein, The air extraction volume per hour of the air inlet collection mechanism (1) for the liquid injection workshop (9) is 6 to 12 times the volume of the liquid injection machine (11); The air extraction volume per hour of the air inlet collection mechanism (1) for the high-temperature forming workshop (10) is 3 to 6 times the volume of the high-temperature forming workshop (10).

4. The purification system for the gas in the lithium battery liquid injection and high-temperature formation workshop according to claim 1, wherein The first purification component (21) includes, a basic absorber (211) provided with alumina filler for removing the first harmful substance therein; a dry filter (212) connected to the output end of the basic absorber (211); a first fan (213) connected to the output end of the dry filter (212).

5. The purification system for the gas in the lithium battery injection and high-temperature formation workshop according to claim 4, characterized in that, The second purification component (22) includes, a rotating wheel (221), the recovery area (a) of the rotating wheel (221) is connected to the first output end of the first fan (213), and the cooling area (b) of the rotating wheel (221) is connected to the second output end of the first fan (213); a first heat exchanger (222), the first input end of the first heat exchanger (222) is connected to the cooling area (b), and the first output end of the first heat exchanger (222) is connected to the desorption area (c) of the rotating wheel (221); a second fan (223), the input end of the second fan (223) is connected to the desorption area (c); a second heat exchanger (224), the first input end of the second heat exchanger (224) is connected to the output end of the second fan (223); a first heater (225), the input end of the first heater (225) is connected to the first output end of the second heat exchanger (224); Catalytic oxidation furnace (226), the input end of the catalytic oxidation furnace (226) is connected to the output end of the first heater (225), and the output end of the catalytic oxidation furnace (226) is connected to the second input end of the first heat exchanger (222); The second output end of the first heat exchanger (222) is connected to the second input end of the second heat exchanger (224), and the second output end of the second heat exchanger (224) is used to exhaust waste gas.

6. The purification system for the gas in the lithium battery liquid injection and high-temperature formation workshop according to claim 1, characterized in that, The condensation assembly (31) includes Surface cooler (311), connected between the chilled water heat exchange pipelines (313); First filter (312), the input end of the first filter (312) is connected to the output end of the surface cooler (311), and the output end of the first filter (312) is connected to the liquid injection workshop (9).

7. The purification system for the gas in the lithium battery injection and high-temperature formation workshop according to claim 1, wherein, The heating assembly (32) includes Second heater (321); Second filter (322), the input end of the second filter (322) is connected to the output end of the second heater (321), and the output end of the second filter (322) is connected to the high-temperature forming workshop (10).

8. The purification system for the gas in the lithium battery liquid injection and high-temperature formation workshop according to claim 1, wherein, The air pressure in the high-temperature forming workshop (10) is greater than the air pressure in the liquid injection workshop (9), and the pressure difference between the high-temperature forming workshop (10) and the liquid injection workshop (9) is 5 Pa.

9. The purification system for the gas in the lithium battery liquid injection and high-temperature formation workshop according to claim 1, wherein The temperature and pressure control mechanism (3) further includes a damper for distributing air volume, connecting the first differential pressure gauge in the liquid injection workshop (9) and the second differential pressure gauge in the high-temperature forming workshop (10).

10. The purification system for the gas in the lithium battery liquid injection and high-temperature formation workshop according to claim 1, wherein, The temperature of the gas after being cooled by the condensation assembly (31) is 18°C to 28°C, and the temperature of the gas after being heated by the heating assembly (32) is 38°C to 48°C.

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