CN113996139A - Energy-saving low-pressure gas-liquid preparation air separation plant - Google Patents
Energy-saving low-pressure gas-liquid preparation air separation plant Download PDFInfo
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- CN113996139A CN113996139A CN202111507274.6A CN202111507274A CN113996139A CN 113996139 A CN113996139 A CN 113996139A CN 202111507274 A CN202111507274 A CN 202111507274A CN 113996139 A CN113996139 A CN 113996139A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/003—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions including coalescing means for the separation of liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/0036—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions by adsorption or absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
- B01D46/12—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces in multiple arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/30—Particle separators, e.g. dust precipitators, using loose filtering material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/005—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by heat treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/261—Drying gases or vapours by adsorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/266—Drying gases or vapours by filtration
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- Drying Of Solid Materials (AREA)
Abstract
The invention discloses an energy-saving air separation device for preparing low-pressure gas-liquid, which comprises a bottom plate, wherein a filter box is fixedly connected to the left side of the top of the bottom plate, the lower ends of the left side and the right side of the inner cavity of the filter box are fixedly connected with a drying screen plate through bolts, and the middle ends of the left side and the right side of the inner cavity of the filter box are fixedly connected with an adsorption cotton plate through bolts. According to the invention, the lower ends of the left side and the right side of the inner cavity of the filter box are fixedly connected with the drying screen plate through bolts, the middle ends of the left side and the right side of the inner cavity of the filter box are fixedly connected with the adsorption cotton plate through bolts, the upper ends of the left side and the right side of the inner cavity of the filter box are fixedly connected with the activated carbon filter screen through bolts, so that the effect of filtering dust and water vapor in air is achieved, the motor is fixedly arranged at the middle end of the top of the drying box, the output shaft of the motor is fixedly connected with the stirring rod through the rotating rod, so that the effect of stirring the molecular sieve is achieved, the molecular sieve can be accelerated to adsorb water vapor in air, and the purposes of purifying and filtering dust are achieved.
Description
Technical Field
The invention relates to the technical field of metal processing, in particular to an energy-saving air separation device for preparing low-pressure gas-liquid.
Background
Metal processing refers to the production activities of human beings for processing metal elements or materials with metal characteristics mainly composed of metal elements, the progress of human society is closely related to the processing and application of metal materials, brass is smelted more than six thousand years ago, simple bronze tools can be manufactured more than four thousand years ago, weapons are manufactured by siderite more than three thousand years ago, after the metal processing is finished, the metal surface needs to be treated by using nitrogen, and further, the nitrogen in the air needs to be extracted by using an air separation plant, but the existing air separation plant does not have the filtering function, thereby easily causing the influence of dust and water vapor carried in the air on the extraction of the nitrogen, reducing the air separation efficiency of the nitrogen and being inconvenient for people to use, and the air separation needs to be carried out by consuming more energy, so an energy-saving low-pressure gas-liquid preparation air separation device is provided.
Disclosure of Invention
The invention aims to provide an energy-saving low-pressure gas-liquid preparation air separation device, which has the advantages of filtering and energy saving and solves the problems that the existing air separation device does not have the filtering function, so that dust and water vapor carried in air easily influence the extraction of nitrogen, the air separation efficiency of the nitrogen is reduced, the air separation device is inconvenient for people to use, and more energy consumption is required for air separation.
In order to achieve the purpose, the invention provides the following technical scheme: an energy-saving air separation device for preparing low-pressure gas and liquid comprises a bottom plate, wherein a filter box is fixedly connected to the left side of the top of the bottom plate, the lower ends of the left side and the right side of an inner cavity of the filter box are fixedly connected with a drying screen plate through bolts, the middle ends of the left side and the right side of the inner cavity of the filter box are fixedly connected with an adsorption cotton plate through bolts, the upper ends of the left side and the right side of the inner cavity of the filter box are fixedly connected with an active carbon filter screen through bolts, a third fan is fixedly installed at the middle end of the top of the filter box through a support seat, an input end of the third fan is fixedly connected with an air suction pipe, an input end of the air suction pipe is communicated with the middle end of the top of the filter box, an output end of the third fan is fixedly connected with a second fan cover, a right side of the top of the bottom plate is fixedly connected with a drying box, a motor is fixedly installed at the middle end of the top of the drying box, and an output shaft of the motor is fixedly connected with a stirring rod through a rotating rod, the surface of the stirring rod is provided with a preformed hole, the left bottom of the drying box is fixedly provided with a first fan through a supporting seat, the output end of the first fan is communicated with the right side of the drying box through a pipeline, the input end of the first fan is fixedly connected with a first fan cover through a pipeline, the input end of the first fan cover is fixedly connected with the output end of a second fan cover through a pipeline, the left top of the drying box and the right top of the filtering box are fixedly connected with a top plate, the top of the top plate is fixedly connected with a second heating box, the middle end of the top of the inner cavity of the second heating box and the middle end of the bottom of the inner cavity of the second heating box are fixedly connected with a second heating plate through bolts, the left middle end of the drying box is fixedly connected with a first heating plate, the left middle end of the inner cavity of the first heating box and the right middle end of the inner cavity of the second heating box are fixedly connected with a first heating plate through bolts, and the right top of the drying box is fixedly provided with a second fan through a supporting seat, the input of second fan passes through the top intercommunication on pipeline and drying cabinet right side, the defeated tuber pipe of output fixedly connected with of second fan, the output fixedly connected with air separation plant body of defeated tuber pipe, the middle-end fixedly connected with supporting pad of air separation plant body bottom, and the bottom of supporting pad and the middle-end fixed connection at bottom plate top.
Preferably, the back of the bottom plate is fixedly connected with a battery box, the middle end on the left side of the inner cavity of the battery box is fixedly connected with a storage battery, the middle end on the right side of the battery box is provided with a charging port, and the output end of the charging port is electrically connected with the input end of the storage battery in a one-way mode.
Preferably, there are second dodge gates through bolt fixedly connected with around the drying cabinet positive surface, the middle-end on the second dodge gate positive surface inlays and is equipped with the second visual window, the second visual window is transparent setting, the feed inlet has been seted up to the upper end at the drying cabinet back, and the surperficial swing joint of feed inlet has the valve.
Preferably, the periphery of the front surface of the filter box is fixedly connected with a first movable door through bolts, and a first visual window is embedded in the middle end of the front surface of the first movable door.
Preferably, the lower extreme on left side of rose box and the lower extreme on right side all seted up the through-hole, the inner chamber fixedly connected with dust screen of through-hole, the through-hole is circular setting, the mesh number of dust screen is two hundred meshes to three hundred meshes.
Preferably, the middle end of the bottom plate bottom is fixedly provided with a PLC controller through a bolt, and the output end of the PLC controller is electrically connected with the input ends of the first fan, the second fan, the third fan and the motor in a single direction.
Preferably, the two sides of the bottom plate are fixedly connected with supporting legs, and the bottoms of the supporting legs are fixedly connected with anti-slip pads.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention has the advantages that the lower ends of the left side and the right side of the inner cavity of the filter box are fixedly connected with the drying screen plate through the bolts, the middle ends of the left side and the right side of the inner cavity of the filter box are fixedly connected with the adsorption cotton plate through the bolts, the upper ends of the left side and the right side of the inner cavity of the filter box are fixedly connected with the activated carbon filter screen through the bolts, the effect of filtering dust and water vapor in air is achieved, the motor is fixedly arranged at the middle end of the top of the drying box, the output shaft of the motor is fixedly connected with the stirring rod through the rotating rod, the effect of stirring the molecular sieve is achieved, the molecular sieve can be accelerated to adsorb water vapor in the air, the purposes of purifying and filtering dust are achieved, the problem that the existing air separation equipment does not have the filtering function is solved, the dust and water vapor carried in the air are easy to influence the extraction of nitrogen, the nitrogen efficiency is reduced, and the use is inconvenient for people, and the air separation is carried out by consuming more energy.
2. In the invention, the middle end of the top of the filter box is fixedly provided with the third fan through the supporting seat, the input end of the third fan is fixedly connected with the air suction pipe, the output end of the third fan is fixedly connected with the second fan cover, the input end of the first fan is fixedly connected with the first fan cover through the pipeline, the input end of the first fan cover is fixedly connected with the output end of the second fan cover through the pipeline, and the effect of conveying air is achieved, the top fixedly connected with second heating cabinet through the roof, the middle-end at second heating cabinet inner chamber top all passes through bolt fixedly connected with second hot plate with the middle-end of bottom, the first heating cabinet of the left middle-end fixedly connected with of drying cabinet, the left middle-end of first heating cabinet inner chamber and the middle-end on right side all pass through the first hot plate of bolt fixedly connected with, have played the effect of heating to can carry out the drying to it at the in-process to air transport.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a first movable door according to the present invention;
FIG. 3 is a schematic structural view of a second movable door according to the present invention;
fig. 4 is a schematic diagram of the battery structure of the present invention.
In the figure: 1. a base plate; 2. a through hole; 3. an air separation plant body; 4. a support pad; 5. a PLC controller; 6. a first fan; 7. a wind delivery pipe; 8. a drying oven; 9. a stirring rod; 10. reserving a hole; 11. a first fan housing; 12. a first heating plate; 13. a first heating tank; 14. a second fan; 15. a motor; 16. a top plate; 17. a second heating plate; 18. a second heating chamber; 19. a second fan housing; 20. a third fan; 21. an air suction pipe; 22. an active carbon filter screen; 23. adsorbing a cotton plate; 24. drying the screen plate; 25. a dust screen; 26. a filter box; 27. a first movable door; 28. a first visual window; 29. a second movable door; 30. a second viewable window; 31. a storage battery; 32. a charging port; 33. a battery case.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, an energy-saving air separation equipment for preparing low-pressure gas and liquid comprises a bottom plate 1, a filter box 26 is fixedly connected to the left side of the top of the bottom plate 1, the lower ends of the left and right sides of the inner cavity of the filter box 26 are fixedly connected with a drying screen plate 24 through bolts, the middle ends of the left and right sides of the inner cavity of the filter box 26 are fixedly connected with an adsorption cotton plate 23 through bolts, the upper ends of the left and right sides of the inner cavity of the filter box 26 are fixedly connected with an activated carbon filter screen 22 through bolts, so as to filter dust and water vapor in air, a third fan 20 is fixedly installed at the middle end of the top of the filter box 26 through a support seat, an air suction pipe 21 is fixedly connected to the input end of the air suction pipe 21 and the middle end of the top of the filter box 26, a second fan cover 19 is fixedly connected to the output end of the third fan 20, and a drying box 8 is fixedly connected to the right side of the top of the bottom plate 1, a motor 15 is fixedly installed at the middle end of the top of the drying box 8, an output shaft of the motor 15 is fixedly connected with a stirring rod 9 through a rotating rod, the effect of stirring the molecular sieve is achieved, so that the molecular sieve can be accelerated to adsorb water vapor in air, the purposes of purifying and filtering dust are achieved, a preformed hole 10 is formed in the surface of the stirring rod 9, a first fan 6 is fixedly installed at the bottom of the left side of the drying box 8 through a supporting seat, the output end of the first fan 6 is communicated with the right side of the drying box 8 through a pipeline, the input end of the first fan 6 is fixedly connected with a first fan cover 11 through a pipeline, the input end of the first fan cover 11 is fixedly connected with the output end of a second fan cover 19 through a pipeline, the effect of conveying air is achieved, a top plate 16 is fixedly connected with the top of the left side of the drying box 8 and the top of the right side of the filtering box 26, and a second heating box 18 is fixedly connected with the top of the top plate 16, the middle end of the top of the inner cavity of the second heating box 18 and the middle end of the bottom are fixedly connected with a second heating plate 17 through bolts, the middle end of the left side of the drying box 8 is fixedly connected with a first heating box 13, the middle end of the left side of the inner cavity of the first heating box 13 and the middle end of the right side of the inner cavity of the first heating box are fixedly connected with a first heating plate 12 through bolts, so that the heating effect is achieved, air can be dried in the air conveying process, a second fan 14 is fixedly arranged at the top of the right side of the drying box 8 through a supporting seat, the input end of the second fan 14 is communicated with the top of the right side of the drying box 8 through a pipeline, the output end of the second fan 14 is fixedly connected with an air conveying pipe 7, the output end of the air conveying pipe 7 is fixedly connected with an air separation device body 3, the middle end of the bottom of the air separation device body 3 is fixedly connected with a supporting pad 4, and the bottom of the supporting pad 4 is fixedly connected with the middle end of the top of the bottom plate 1, the back of the bottom plate 1 is fixedly connected with a battery box 33, the middle end at the left side of the inner cavity of the battery box 33 is fixedly connected with a storage battery 31, the middle end at the right side of the battery box 33 is provided with a charging port 32, the output end of the charging port 32 is unidirectionally and electrically connected with the input end of the storage battery 31, the periphery of the front surface of the drying box 8 is fixedly connected with a second movable door 29 through bolts, the middle end at the front surface of the second movable door 29 is embedded with a second visual window 30, the second visual window 30 is arranged in a transparent way, the upper end at the back of the drying box 8 is provided with a feeding port, the surface of the feeding port is movably connected with a valve, the periphery of the front surface of the filtering box 26 is fixedly connected with a first movable door 27 through bolts, the middle end at the front surface of the first movable door 27 is embedded with a first visual window 28, the lower ends at the left side and the right side of the filtering box 26 are both provided with through holes 2, the inner cavity of the through holes 2 is fixedly connected with a dustproof net 25, the through holes 2 are arranged in a circular way, the mesh number of dust screen 25 is two hundred meshes to three hundred meshes, and there is PLC controller 5 at the middle-end of bottom plate 1 bottom through bolt fixed mounting, PLC controller 5's output and the one-way electric connection of first fan 6, second fan 14, third fan 20 and motor 15's input, the both sides fixedly connected with supporting leg of bottom plate 1 bottom, and the bottom fixedly connected with slipmat of supporting leg.
When in use, the lower ends of the left side and the right side of the inner cavity of the filter box 26 are fixedly connected with a drying screen plate 24 through bolts, the middle ends of the left side and the right side of the inner cavity of the filter box 26 are fixedly connected with an adsorption cotton plate 23 through bolts, the upper ends of the left side and the right side of the inner cavity of the filter box 26 are fixedly connected with an active carbon filter screen 22 through bolts, the effect of filtering dust and water vapor in air is achieved, the motor 15 is fixedly installed at the middle end of the top of the drying box 8, the output shaft of the motor 15 is fixedly connected with the stirring rod 9 through a rotating rod, the effect of stirring the molecular sieve is achieved, so that the molecular sieve can be accelerated to adsorb water vapor in air, the purposes of purifying and filtering dust are achieved, the problem that the existing air separation equipment does not have a filtering function is solved, the influence of dust and water vapor carried in air on nitrogen extraction is easily caused, and the nitrogen air separation efficiency is reduced, inconvenient for people to use and needs to consume more energy for space division.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides an air separation plant is prepared to energy-saving low-pressure gas-liquid, includes bottom plate (1), its characterized in that: the drying device is characterized in that a filter box (26) is fixedly connected to the left side of the top of the bottom plate (1), a drying screen plate (24) is fixedly connected to the lower ends of the left side and the right side of an inner cavity of the filter box (26) through bolts, an adsorption cotton plate (23) is fixedly connected to the middle ends of the left side and the right side of the inner cavity of the filter box (26) through bolts, an activated carbon filter screen (22) is fixedly connected to the upper ends of the left side and the right side of the inner cavity of the filter box (26) through bolts, a third fan (20) is fixedly mounted at the middle end of the top of the filter box (26) through a supporting seat, an air suction pipe (21) is fixedly connected to the input end of the third fan (20), the input end of the air suction pipe (21) is communicated with the middle end of the top of the filter box (26), a second air cover (19) is fixedly connected to the output end of the third fan (20), and a drying box (8) is fixedly connected to the right side of the top of the bottom plate (1), the middle-end fixed mounting at the top of the drying box (8) is provided with a motor (15), an output shaft of the motor (15) is fixedly connected with a stirring rod (9) through a rotating rod, a preformed hole (10) is formed in the surface of the stirring rod (9), a first fan (6) is fixedly mounted at the left bottom of the drying box (8) through a supporting seat, the output end of the first fan (6) is communicated with the right side of the drying box (8) through a pipeline, the input end of the first fan (6) is fixedly connected with a first fan cover (11) through a pipeline, the input end of the first fan cover (11) is fixedly connected with the output end of a second fan cover (19) through a pipeline, the top of the left top of the drying box (8) and the top of the right side of a filter box (26) are fixedly connected with a top plate (16), and the top of the top plate (16) is fixedly connected with a second heating box (18), the middle end of the top part and the middle end of the bottom part of the inner cavity of the second heating box (18) are fixedly connected with a second heating plate (17) through bolts, the middle end of the left side of the drying box (8) is fixedly connected with a first heating box (13), the middle end of the left side and the middle end of the right side of the inner cavity of the first heating box (13) are fixedly connected with a first heating plate (12) through bolts, the top of the right side of the drying box (8) is fixedly provided with a second fan (14) through a supporting seat, the input end of the second fan (14) is communicated with the top of the right side of the drying box (8) through a pipeline, the output end of the second fan (14) is fixedly connected with an air delivery pipe (7), the output end of the air delivery pipe (7) is fixedly connected with an air separation device body (3), the middle end of the bottom of the air separation plant body (3) is fixedly connected with a supporting pad (4), and the bottom of the supporting pad (4) is fixedly connected with the middle end of the top of the bottom plate (1).
2. An energy-saving low-pressure gas-liquid preparation air separation plant as claimed in claim 1, characterized in that: the back fixedly connected with battery case (33) of bottom plate (1), middle-end fixedly connected with battery (31) on the left of battery case (33) inner chamber, charge mouth (32) have been seted up to the middle-end on battery case (33) right side, the one-way electric connection of input of the output of the mouth of charging (32) and battery (31).
3. An energy-saving low-pressure gas-liquid preparation air separation plant as claimed in claim 1, characterized in that: the utility model discloses a dryer, including drying cabinet (8), bolt fixedly connected with second dodge gate (29) all around on drying cabinet (8) positive surface, the well end on second dodge gate (29) positive surface inlays and is equipped with second visual window (30), second visual window (30) are transparent setting, the feed inlet has been seted up to the upper end at the drying cabinet (8) back, and the surperficial swing joint of feed inlet has the valve.
4. An energy-saving low-pressure gas-liquid preparation air separation plant as claimed in claim 1, characterized in that: the periphery of the front surface of the filter box (26) is fixedly connected with a first movable door (27) through bolts, and a first visual window (28) is embedded in the middle end of the front surface of the first movable door (27).
5. An energy-saving low-pressure gas-liquid preparation air separation plant as claimed in claim 1, characterized in that: through-hole (2) have all been seted up to the lower extreme on left lower extreme and the right side of rose box (26), the inner chamber fixedly connected with dust screen (25) of through-hole (2), through-hole (2) are circular setting, the mesh number of dust screen (25) is two hundred meshes to three hundred meshes.
6. An energy-saving low-pressure gas-liquid preparation air separation plant as claimed in claim 1, characterized in that: the middle end of the bottom plate (1) is fixedly provided with a PLC (programmable logic controller) controller (5) through a bolt, and the output end of the PLC controller (5) is electrically connected with the input ends of the first fan (6), the second fan (14), the third fan (20) and the motor (15) in a single direction.
7. An energy-saving low-pressure gas-liquid preparation air separation plant as claimed in claim 1, characterized in that: the supporting legs are fixedly connected to the two sides of the bottom plate (1), and the anti-slip pads are fixedly connected to the bottoms of the supporting legs.
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| CN202111507274.6A CN113996139A (en) | 2021-12-10 | 2021-12-10 | Energy-saving low-pressure gas-liquid preparation air separation plant |
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| CN202111507274.6A CN113996139A (en) | 2021-12-10 | 2021-12-10 | Energy-saving low-pressure gas-liquid preparation air separation plant |
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| CN210057700U (en) * | 2019-05-28 | 2020-02-14 | 欧航铭 | Air purifier convenient to it is clean |
| CN210495803U (en) * | 2019-07-10 | 2020-05-12 | 苏州艾唯尔气体设备有限公司 | Pressure swing adsorption nitrogen making machine assembly capable of improving nitrogen purity |
| CN211146752U (en) * | 2019-11-21 | 2020-07-31 | 胡起玮 | Central air conditioner with fresh air filtering function |
| CN213049868U (en) * | 2020-07-14 | 2021-04-27 | 杜萌 | Portable air purification equipment |
| CN213132608U (en) * | 2020-07-20 | 2021-05-07 | 北京康洁源环保科技有限公司 | High-efficient environmental protection indoor formaldehyde removing construction machine |
| CN213679832U (en) * | 2020-08-13 | 2021-07-13 | 河南德尔液空科技有限公司 | Energy-saving nitrogen making air separation machine |
| CN213141413U (en) * | 2020-09-21 | 2021-05-07 | 内蒙古恒茂鑫精细化工有限公司 | Nitrogen making device |
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