CN113477199A - Ultra-low temperature discharge unit - Google Patents
Ultra-low temperature discharge unit Download PDFInfo
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- CN113477199A CN113477199A CN202110728182.4A CN202110728182A CN113477199A CN 113477199 A CN113477199 A CN 113477199A CN 202110728182 A CN202110728182 A CN 202110728182A CN 113477199 A CN113477199 A CN 113477199A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
- B01J19/087—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electric or magnetic energy
- B01J19/088—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electric or magnetic energy giving rise to electric discharges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
- B01J19/0013—Controlling the temperature of the process
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Abstract
本发明提供一种超低温放电单元，包括绝缘管以及高压电极管，所述高压电极管设置在绝缘管内部，所述绝缘管和高压电极管之间设置有通气内腔，所述绝缘管的上下两端分别连接有进气口以及出气口，所述进气口用于通入待处理的反应气体，所述进气口和出气口分别与通气内腔相连通，所述高压电极管的内部设置有第一通油内腔，本发明采用通油冷却的方式，能够有效对放电区温度进行控制，相较于水冷的方式能够提高冷却过程的安全性，防止触电问题的发生，并且油能比水控制的温度范围更广，以保证冷却的有效性，解决了放电区温度上升较快、控制难度大、从而导致活性物质存在时间短、浓度低和中间产物无法获得且冷却安全性较差的问题。
The invention provides an ultra-low temperature discharge unit, comprising an insulating tube and a high-voltage electrode tube, wherein the high-voltage electrode tube is arranged inside the insulating tube, a ventilation inner cavity is arranged between the insulating tube and the high-voltage electrode tube, and the upper and lower parts of the insulating tube are The two ends are respectively connected with an air inlet and an air outlet, the air inlet is used for introducing the reaction gas to be treated, the air inlet and the air outlet are respectively connected with the ventilation inner cavity, and the inside of the high-voltage electrode tube is A first oil-passing inner cavity is provided. The present invention adopts the method of oil-passing cooling, which can effectively control the temperature of the discharge area. Compared with the water-cooling method, the safety of the cooling process can be improved, the occurrence of electric shock problems can be prevented, and the oil can It has a wider temperature range than water control to ensure the effectiveness of cooling, and solves the problem that the temperature of the discharge area rises rapidly and the control is difficult, resulting in a short existence time of active substances, low concentration, unobtainable intermediate products and poor cooling safety. The problem.
Description
Technical Field
The invention relates to the technical field of plasma chemical synthesis, in particular to an ultralow temperature discharge unit.
Background
The diesel engine has the advantages of high power, high efficiency, good economy and the like, is widely applied to industrial and agricultural production and urban traffic, but has the increasingly prominent pollution problem caused by harmful emission of the diesel engine along with the increasingly strict emission regulations. The control of harmful emissions from diesel engines focuses on Particulate Matter (PM) and nitrogen oxides (NOx). At present, the requirement of emission regulations cannot be met only by the internal purification technology, and the external purification technology needs to be combined. The technology of treating the diesel engine emissions by using a non-thermal plasma (NTP) technology generated by Dielectric Barrier Discharge (DBD) is a new technology emerging in recent years, has the advantages of good treatment effect, wide application range, capability of treating various pollutants simultaneously, no secondary pollution and the like, and has wide application prospect in the field of diesel engine aftertreatment.
After the gas source such as air in the discharge gap of the NTP reactor is broken down, a large amount of active substances including O, O2, OH, O3, NO2, various excited states of nitrogen and oxygen atoms, and the like are generated. Masaaki Okubo et al, a Japanese scholarler, implemented regeneration of a particulate filter (DPF) at around 250 ℃ using a low temperature plasma technique, points out that O3 and NO2 are the main substances that oxidize PM. Relevant studies have shown that the decomposition reactions of O3 and NO2 are accelerated with increasing temperature, and the decomposition is very severe above 100 ℃. The naturally cooled NTP reactor discharge area has fast temperature rise and great control difficulty, and the problems of short time, low concentration and difficult obtaining of intermediate products of active substances are caused. Therefore, effective control of the discharge zone temperature has a significant impact on the performance of NTP reactors.
In order to effectively control the temperature of a discharge area, an ultralow temperature discharge unit is designed so as to provide a basis for further researching the reduction of diesel engine emission and DPF regeneration of an indirect low temperature plasma system.
Disclosure of Invention
The invention aims to provide an ultralow-temperature dielectric barrier discharge DBD type NTP reaction device, which is used for effectively controlling the temperature of a discharge area and can effectively solve the problems that the temperature of the discharge area rises quickly and is difficult to control, so that the existence time of active substances is short, the concentration is low and intermediate products cannot be obtained.
In order to achieve the purpose, the invention is realized by the following technical scheme: an ultralow temperature discharge unit comprises an insulating tube and a high-voltage electrode tube, wherein the high-voltage electrode tube is arranged inside the insulating tube, a ventilation inner cavity is arranged between the insulating tube and the high-voltage electrode tube, the upper end and the lower end of the insulating tube are respectively connected with an air inlet and an air outlet, the air inlet is used for introducing reaction gas to be treated, the air inlet and the air outlet are respectively communicated with the ventilation inner cavity, a first oil through inner cavity is arranged inside the high-voltage electrode tube, the two ends of the high-voltage electrode tube are respectively connected with a first oil inlet and a first oil outlet, the first oil inlet and the first oil outlet are respectively communicated with the first oil through inner cavity, a low-voltage electrode tube is arranged in the middle of the outside of the insulating tube, a second oil through inner cavity is arranged between the low-voltage electrode tube and the insulating tube, and the outside of the low-voltage electrode tube is connected with a second oil inlet and a second oil outlet, and the second oil inlet and the second oil outlet are respectively communicated with the second oil through inner cavity.
Further, be provided with first connector between air inlet and the insulating tube, be provided with the second connector between gas outlet and the insulating tube, first connector and second connector are used for sealing the both ends of insulating tube, first connector and second connector are linked together with the inner chamber of ventilating respectively, air inlet and gas outlet are linked together with first connector and second connector inside respectively.
Furthermore, the first oil inlet, the second oil inlet, the first oil outlet and the second oil outlet are respectively connected with an oil pipe, an anti-condensation mechanism is sleeved on the oil pipe and used for removing condensed water outside the oil pipe.
Further, prevent that condensation mechanism includes the sleeve pipe, the inside through-hole that has run through of sleeve pipe, oil pipe runs through the sleeve pipe through the through-hole, the inside stoving inner chamber of having seted up of sleeve pipe, be connected with first blow vent and second blow vent on the sleeve pipe, first blow vent and second blow vent are used for letting in stoving gas to the sleeve pipe circulation.
Further, the ultra-low temperature discharge unit further comprises an upper plate, a lower plate and a vertical plate, wherein the upper plate and the lower plate are respectively fixed on the upper side and the lower side of the vertical plate, the high-voltage electrode tube respectively penetrates through the upper plate and the lower plate, the first oil inlet is formed in the upper portion of the upper plate, the first oil outlet is formed in the lower portion of the lower plate, and a base is fixed at the bottom of the vertical plate.
Furthermore, a supporting plate is arranged in the middle of the vertical plate, the supporting plate is arranged at the bottom of the low-voltage electrode tube and used for supporting the low-voltage electrode tube, and the high-voltage electrode tube and the insulating tube penetrate through the supporting plate.
The invention has the beneficial effects that: compared with the traditional naturally-cooled NTP reactor, the reactor can effectively control the temperature of a discharge area, effectively solve the problems of short time and low concentration of active substances caused by quick temperature rise of the discharge area and high control difficulty, and prolong the reaction time so as to obtain a reaction intermediate product; adopt the refrigerated mode of logical oil simultaneously, compare in the water-cooled mode can improve the security of cooling process, prevent the emergence of electric shock problem to oil can be wider than the temperature range of water control, and the freezing point of oil is low and the boiling point is high, can bear bigger difference in temperature, in order to guarantee refrigerated validity.
According to the invention, the anti-condensation mechanism is arranged on the oil pipe, so that the outer surface of the oil pipe in the anti-condensation mechanism can be dried, and the safety problem that electric shock accidents are caused because condensed water is possibly conducted with a high-voltage electrode is solved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of a low voltage electrode tube, an insulating tube and a high voltage electrode tube;
FIG. 3 is a schematic structural view of an anti-condensation mechanism;
FIG. 4 is a schematic view of a partial connection of the anti-condensation mechanism to the oil tube.
In the figure: 1. a first oil inlet; 2. a first oil outlet; 3. a second oil inlet; 4. a second oil outlet; 5. an air inlet; 501. a first connector; 6. an air outlet; 601. a second connector; 7. an insulating tube; 701. a venting lumen; 8. a high voltage electrode tube; 801. a first oil through inner cavity; 9. a low voltage electrode tube; 901. a second oil through cavity; 10. an upper plate; 11. a lower plate; 12. a support plate; 13. a vertical plate; 1301. a base; 14. a sleeve; 15. a through hole; 16. a first vent; 17. a second vent; 18. and (5) oil pipe passing.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of the present invention; fig. 2 is a sectional view of the low voltage electrode tube 9, the insulating tube 7, and the high voltage electrode tube 8. An ultralow temperature discharge unit comprises an insulating tube 7 and a high-voltage electrode tube 8, wherein the high-voltage electrode tube 8 is arranged inside the insulating tube 7, a ventilation inner cavity 701 is arranged between the insulating tube 7 and the high-voltage electrode tube 8, the upper end and the lower end of the insulating tube 7 are respectively connected with an air inlet 5 and an air outlet 6, the air inlet 5 is used for introducing reaction gas to be treated, the air inlet 5 and the air outlet 6 are respectively communicated with the ventilation inner cavity 701, a first oil through inner cavity 801 is arranged inside the high-voltage electrode tube 8, the two ends of the high-voltage electrode tube 8 are respectively connected with a first oil inlet 1 and a first oil outlet 2, the first oil inlet 1 and the first oil outlet 2 are respectively communicated with the first oil through inner cavity 801, a low-voltage electrode tube 9 is arranged in the middle of the outside of the insulating tube 7, and a second oil through inner cavity 901 is arranged between the low-voltage electrode tube 9 and the insulating tube 7, the external of the low-voltage electrode tube 9 is connected with a second oil inlet 3 and a second oil outlet 4, the second oil inlet 3 and the second oil outlet 4 are respectively communicated with a second oil passing inner cavity 901, and the length of the low-voltage electrode tube 9 is 20% of that of the insulating tube 7.
The axes of the insulating tube 7, the high-voltage electrode tube 8 and the low-voltage electrode tube 9 are arranged on the same axis, and the minimum radius difference between the high-voltage electrode tube 8 and the low-voltage electrode tube 9 is 2-10 mm, so that the heat exchange uniformity of cooling oil passing through can be ensured, and the reaction uniformity of introduced to-be-treated reaction gas can be ensured.
The high-voltage electrode tube 8 and the low-voltage electrode tube 9 are made of 304 or 316 stainless steel, the insulating tube 7 is made of transparent or pearly-lustre quartz glass tubes, and the tube wall thicknesses of the insulating tube 7, the high-voltage electrode tube 8 and the low-voltage electrode tube 9 are 0.8mm-2 mm.
In a specific reaction process, the high-voltage electrode tube 8 and the low-voltage electrode tube 9 are used as two electrodes, the high-voltage electrode is connected with an external power supply through a lead, and the low-voltage electrode is grounded, so that a Dielectric Barrier Discharge (DBD) area is formed between the high-voltage electrode tube 8 and the low-voltage electrode tube 9.
First oil inlet 1 and the external oil pump of second oil inlet 3 can carry cooling fluid through the oil pump, and the fluid circulation is realized to first oil-out 2 of rethread and second oil-out 4, and external cooling device is disposed to outside fluid storage process, can adjust the oil temperature to the realization is to the control of discharge area temperature, can prolong discharge time, give the reaction cooling through oil circulation in order to form the ultra-low temperature discharge area.
Be provided with first connector 501 between air inlet 5 and the insulating tube 7, be provided with second connector 601 between gas outlet 6 and the insulating tube 7, first connector 501 and second connector 601 are used for sealing the both ends of insulating tube 7, first connector 501 and second connector 601 are linked together with the inner chamber 701 of ventilating respectively, air inlet 5 and gas outlet 6 are linked together with first connector 501 and second connector 601 inside respectively, set up first connector 501 and second connector 601, can improve stability and the leakproofness of being connected between insulating tube 7 and the high voltage electrode pipe 8.
The ultra-low temperature discharge unit further comprises an upper plate 10, a lower plate 11 and a vertical plate 13, wherein the upper plate 10 and the lower plate 11 are respectively fixed on the upper side and the lower side of the vertical plate 13, the high-voltage electrode tube 8 respectively penetrates through the upper plate 10 and the lower plate 11, the first oil inlet 1 is arranged above the upper plate 10, the first oil outlet 2 is arranged below the lower plate 11, a base 1301 is fixed at the bottom of the vertical plate 13, a supporting plate 12 is arranged in the middle of the vertical plate 13, the supporting plate 12 is arranged at the bottom of the low-voltage electrode tube 9, the supporting plate 12 is used for supporting the low-voltage electrode tube 9, and the high-voltage electrode tube 8 and the insulating tube 7 penetrate through the supporting plate 12. The reaction main body can be fixed by arranging the upper plate 10, the lower plate 11 and the vertical plate 13, so that the stability of the reaction experiment process is improved.
The support plate 12 and the vertical plate 13 can be connected in a vertical sliding manner, and the support plate 12 can drive the low-voltage electrode tube 9 to adjust the vertical position outside the insulating tube 7.
Referring to fig. 3 and 4, fig. 3 is a schematic structural view of the condensation preventing mechanism; fig. 4 is a partial connection schematic diagram of the anti-condensation mechanism and the oil pipe 18. The oil pipe is characterized in that the first oil inlet 1, the second oil inlet 3, the first oil outlet 2 and the second oil outlet 4 are respectively connected with an oil pipe 18, an anti-condensation mechanism is sleeved on the oil pipe 18, and the anti-condensation mechanism is used for removing condensed water outside the oil pipe 18. Because the oil pipe 18 is filled with oil with lower temperature, water vapor in the air can be condensed into liquid water to cover the oil pipe 18, the condensed water on the oil pipe 18 connected with the high-voltage electrode pipe 8 can be conductive with the high-voltage electrode, and therefore electric shock accidents are caused, and the oil pipe 18 is provided with a condensation preventing mechanism for safety.
The anti-condensation mechanism comprises a sleeve 14, a through hole 15 penetrates through the inside of the sleeve 14, an oil pipe 18 penetrates through the sleeve 14 through the through hole 15, a drying inner cavity is formed in the sleeve 14, a first vent 16 and a second vent 17 are connected to the sleeve 14, the first vent 16 and the second vent 17 are used for circularly introducing drying gas into the sleeve 14, the sleeve 14 is made of transparent or pearly-lustre quartz glass tubes, and the drying gas capable of being introduced into the sleeve 14 is dry air, nitrogen, oxygen and the like.
The working principle is as follows: in the operation process of a specific experiment, reaction gas to be treated is introduced into a ventilation inner cavity 701 between an insulating tube 7 and a high-voltage electrode tube 8 through an air inlet 5 and an air outlet 6 for reaction treatment, cooling oil is introduced into a first oil inlet 1 and a second oil inlet 3 through an oil pipe 18 respectively, the inner side and the outer side of the high-voltage electrode tube 8 can be rapidly cooled, oil after heat exchange is discharged through a first oil outlet 2 and a second oil outlet 4, circulating cooling is realized, the temperature of a discharge area is effectively controlled, the problems that the temperature of the discharge area rises fast, the active substances are short in existence time and low in concentration due to large control difficulty can be effectively solved, and the reaction time can be prolonged to obtain a reaction intermediate product.
Meanwhile, dry gas is introduced into the sleeve 14 through the first vent 16 and the second vent 17, so that the outer surface of the oil pipe 18 in the sleeve 14 is kept dry, and the problem of electric shock safety caused by electric conduction of condensed water is prevented.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (6)
1. An ultralow temperature discharge unit comprises an insulating tube (7) and a high-voltage electrode tube (8), wherein the high-voltage electrode tube (8) is arranged inside the insulating tube (7), a ventilation inner cavity (701) is arranged between the insulating tube (7) and the high-voltage electrode tube (8), the upper end and the lower end of the insulating tube (7) are respectively connected with an air inlet (5) and an air outlet (6), the air inlet (5) is used for introducing reaction gas to be treated, the air inlet (5) and the air outlet (6) are respectively communicated with the ventilation inner cavity (701), the ultralow temperature discharge unit is characterized in that a first oil through inner cavity (801) is arranged inside the high-voltage electrode tube (8), the two ends of the high-voltage electrode tube (8) are respectively connected with a first oil inlet (1) and a first oil outlet (2), the first oil inlet (1) and the first oil outlet (2) are respectively communicated with the first oil through inner cavity (801), the middle of the outer portion of the insulating tube (7) is provided with a low-voltage electrode tube (9), a second oil through inner cavity (901) is formed between the low-voltage electrode tube (9) and the insulating tube (7), the outer portion of the low-voltage electrode tube (9) is connected with a second oil inlet (3) and a second oil outlet (4), and the second oil inlet (3) and the second oil outlet (4) are respectively communicated with the second oil through inner cavity (901).
2. An ultra-low temperature discharge unit according to claim 1, characterized in that, be provided with first connector (501) between air inlet (5) and insulating tube (7), be provided with second connector (601) between gas outlet (6) and insulating tube (7), first connector (501) and second connector (601) are used for sealing the both ends of insulating tube (7), first connector (501) and second connector (601) are linked together with interior chamber (701) of ventilating respectively, air inlet (5) and gas outlet (6) are linked together with first connector (501) and second connector (601) inside respectively.
3. The ultra-low temperature discharge unit of claim 1, wherein the first oil inlet (1), the second oil inlet (3), the first oil outlet (2) and the second oil outlet (4) are respectively connected with an oil pipe (18), the oil pipe (18) is sleeved with a condensation preventing mechanism, and the condensation preventing mechanism is used for removing condensed water outside the oil pipe (18).
4. An ultra-low temperature discharge unit according to claim 3, wherein the anti-condensation mechanism comprises a sleeve (14), a through hole (15) penetrates through the sleeve (14), the oil pipe (18) penetrates through the sleeve (14) through the through hole (15), a drying inner cavity is opened inside the sleeve (14), the sleeve (14) is connected with a first vent (16) and a second vent (17), and the first vent (16) and the second vent (17) are used for circularly introducing drying gas into the sleeve (14).
5. The ultra-low temperature discharge unit of claim 1, further comprising an upper plate (10), a lower plate (11) and a vertical plate (13), wherein the upper plate (10) and the lower plate (11) are respectively fixed on the upper side and the lower side of the vertical plate (13), the high voltage electrode tube (8) respectively penetrates through the upper plate (10) and the lower plate (11), the first oil inlet (1) is arranged above the upper plate (10), the first oil outlet (2) is arranged below the lower plate (11), and a base (1301) is fixed at the bottom of the vertical plate (13).
6. An ultra-low temperature discharge unit according to claim 5, characterized in that a support plate (12) is arranged in the middle of the vertical plate (13), the support plate (12) is arranged at the bottom of the low voltage electrode tube (9), the support plate (12) is used for supporting the low voltage electrode tube (9), and the high voltage electrode tube (8) and the insulating tube (7) penetrate through the support plate (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110728182.4A CN113477199A (en) | 2021-06-29 | 2021-06-29 | Ultra-low temperature discharge unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110728182.4A CN113477199A (en) | 2021-06-29 | 2021-06-29 | Ultra-low temperature discharge unit |
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| CN113477199A true CN113477199A (en) | 2021-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110728182.4A Withdrawn CN113477199A (en) | 2021-06-29 | 2021-06-29 | Ultra-low temperature discharge unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115090236A (en) * | 2022-06-20 | 2022-09-23 | 浙江理工大学 | An ultra-low temperature discharge unit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4261806A (en) * | 1979-01-22 | 1981-04-14 | Agency Of Industrial Science & Technology | Method for the treatment of inner surfaces of a tubular body of a plastic with low temperature plasma |
| CN105251323A (en) * | 2015-10-27 | 2016-01-20 | 江苏大学 | Automotive water cooled type NTP generation system |
| CN207016482U (en) * | 2017-06-15 | 2018-02-16 | 云南益水环保工程有限公司 | A kind of double oil pocket cooling ozone generating pipes and its manufactured ozone generator |
| CN108278199A (en) * | 2018-04-03 | 2018-07-13 | 苏州瑞驱电动科技有限公司 | Prevent the compressor controller and its inflation method that condense and condense |
| CN109441594A (en) * | 2018-09-29 | 2019-03-08 | 江苏大学 | A kind of water-cooled NTP generator based on packed bed dielectric barrier discharge |
-
2021
- 2021-06-29 CN CN202110728182.4A patent/CN113477199A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4261806A (en) * | 1979-01-22 | 1981-04-14 | Agency Of Industrial Science & Technology | Method for the treatment of inner surfaces of a tubular body of a plastic with low temperature plasma |
| CN105251323A (en) * | 2015-10-27 | 2016-01-20 | 江苏大学 | Automotive water cooled type NTP generation system |
| CN207016482U (en) * | 2017-06-15 | 2018-02-16 | 云南益水环保工程有限公司 | A kind of double oil pocket cooling ozone generating pipes and its manufactured ozone generator |
| CN108278199A (en) * | 2018-04-03 | 2018-07-13 | 苏州瑞驱电动科技有限公司 | Prevent the compressor controller and its inflation method that condense and condense |
| CN109441594A (en) * | 2018-09-29 | 2019-03-08 | 江苏大学 | A kind of water-cooled NTP generator based on packed bed dielectric barrier discharge |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115090236A (en) * | 2022-06-20 | 2022-09-23 | 浙江理工大学 | An ultra-low temperature discharge unit |
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Application publication date: 20211008 |