CN214223555U - Nitrogen production equipment - Google Patents
Nitrogen production equipment Download PDFInfo
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- CN214223555U CN214223555U CN202023005424.7U CN202023005424U CN214223555U CN 214223555 U CN214223555 U CN 214223555U CN 202023005424 U CN202023005424 U CN 202023005424U CN 214223555 U CN214223555 U CN 214223555U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The utility model discloses nitrogen making equipment, which comprises an air compression system and a waste heat recovery system; the air compression system comprises an air compressor and a liquid cooling motor for driving the air compressor, wherein the air compressor is provided with a compressed air outlet, and the liquid cooling motor is provided with a cooling liquid inlet and a cooling liquid outlet; the waste heat recovery system comprises a first heat exchanger, the first heat exchanger is provided with a first heat exchange medium inlet, a first heat exchanger compressed air inlet, a first heat exchange medium outlet and a first heat exchanger compressed air outlet, and a cooling liquid outlet is communicated with the first heat exchange medium inlet; the compressed air outlet is communicated with the compressed air inlet of the first heat exchanger. The utility model provides a nitrogen making equipment adopts the liquid cooling motor as the air compressor machine driving source, retrieves the heat energy of liquid cooling motor simultaneously, further heats the air after air pretreatment system handles, consequently, the utility model provides a nitrogen making equipment has advantages such as energy-concerving and environment-protective.
Description
Technical Field
The utility model relates to a nitrogen making technical field especially relates to a nitrogen making equipment.
Background
At present, a main stream of nitrogen making equipment is configured into a diesel-driven engine, a direct-drive air compressor and a vertical air cooling water radiator are arranged, and gas in a pipeline is heated in an electric heating mode. On one hand, the diesel engine can generate a lot of polluted gases and solid particles such as nitrides and sulfides, and the polluted gases and the solid particles can pollute the environment to a certain extent; on the other hand, both vertical air cooling water radiator and electric heating consume a large amount of energy. Therefore, it is necessary to provide an environment-friendly and energy-saving nitrogen making device.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a nitrogen making equipment to solve the big and polluted environment's of prior art nitrogen making equipment energy consumption technical problem.
In order to solve the above problem, the utility model adopts the following technical scheme:
according to one aspect of the application, a nitrogen production plant is provided, comprising an air compression system and a waste heat recovery system; the air compression system comprises an air compressor and a liquid cooling motor for driving the air compressor, wherein the air compressor is provided with a compressed air outlet, and the liquid cooling motor is provided with a cooling liquid inlet and a cooling liquid outlet; the waste heat recovery system comprises a first heat exchanger, the first heat exchanger is provided with a first heat exchange medium inlet, a first heat exchanger compressed air inlet, a first heat exchange medium outlet and a first heat exchanger compressed air outlet, and the cooling liquid outlet is communicated with the first heat exchange medium inlet; the compressed air outlet is communicated with the compressed air inlet of the first heat exchanger.
Optionally, the first heat exchange medium outlet is communicated with the cooling liquid inlet.
Optionally, the waste heat recovery system further comprises a storage tank, and the first heat exchange medium outlet is communicated with the cooling liquid inlet through the storage tank.
Optionally, the waste heat recovery system further comprises a pump disposed on the pipeline between the storage tank and the coolant inlet.
Optionally, a check valve is provided between the storage tank and the coolant inlet.
Optionally, the nitrogen plant further comprises: the air pretreatment system comprises a pretreatment gas inlet and a pretreatment gas outlet, the compressed air outlet is communicated with the pretreatment gas inlet, and the pretreatment gas outlet is communicated with the compressed air inlet of the first heat exchanger.
Optionally, the air pretreatment system further comprises a drain, the waste heat recovery system further comprises a second heat exchanger, the second heat exchanger comprises a second heat exchange medium inlet, a second heat exchange medium outlet, a sewage inlet before heat exchange and a sewage outlet after heat exchange, the first heat exchange medium inlet and the second heat exchange medium inlet are communicated with the coolant outlet simultaneously, and the drain is communicated with the sewage inlet before heat exchange.
Optionally, the cooling liquid outlet is communicated to the first heat exchange medium inlet and the second heat exchange medium inlet respectively through a three-way valve.
Optionally, the waste heat recovery system further comprises a sewage tank; and the sewage outlet after heat exchange is communicated with the sewage tank.
Optionally, the air compression system further includes a third heat exchanger, the third heat exchanger includes a gas heat exchange pipe, a liquid heat exchange pipe and a cooling medium passage, the cooling medium passage is configured to enable a cooling medium therein to exchange heat with the gas in the gas heat exchange pipe and the liquid in the liquid heat exchange pipe, respectively, and the compressed air outlet and the pretreated gas inlet are communicated through the gas heat exchange pipe.
Optionally, the waste heat recovery system further comprises a temperature detection element and a switching element; the liquid heat exchange pipeline comprises a liquid inlet and a liquid outlet, and the liquid outlet is communicated to the cooling liquid inlet; the temperature detection element is communicated with the second heat exchange medium outlet and is configured to detect the temperature of the liquid at the second heat exchange medium outlet and feed back the temperature value to the switching element; the switching element is configured to enable the second heat exchange medium outlet to be communicated with the liquid inlet of the liquid heat exchange pipeline of the third heat exchanger when the fed-back temperature value is higher than a set value, and enable the second heat exchange medium outlet to be communicated with the cooling liquid inlet when the fed-back temperature value is lower than the set value.
Optionally, the temperature detecting element and the switching element are integrated into a thermostat, the thermostat comprises a thermostat inlet, a thermostat first outlet and a thermostat second outlet, the thermostat inlet is communicated with the second heat exchange medium outlet, the thermostat first outlet is communicated with the liquid inlet of the liquid heat exchange pipe of the third heat exchanger, and the thermostat second outlet is communicated to the cooling liquid inlet; the thermostat is configured to open the thermostat first outlet while closing the thermostat second outlet when the fed back temperature value is above a set point and to open the thermostat second outlet while closing the thermostat first outlet when the fed back temperature value is below the set point.
Optionally, a nitrogen separation system is also included; the nitrogen separation system comprises a membrane group, the membrane group comprises a membrane group inlet and a membrane group outlet, and the membrane group inlet is communicated with the compressed air outlet of the first heat exchanger.
The utility model discloses a technical scheme can reach following beneficial effect:
the utility model provides a nitrogen making equipment adopts the liquid cooling motor as the air compressor machine driving source, retrieves the heat energy of liquid cooling motor simultaneously, further heats the air after air pretreatment system handles, consequently, the utility model provides a nitrogen making equipment has advantages such as energy-concerving and environment-protective.
Drawings
The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided for explaining the invention without unduly limiting it. In the drawings:
fig. 1 is a schematic structural view of a nitrogen production apparatus according to the present invention.
Description of reference numerals:
1 air compression system
11 air compressor
12 liquid cooling motor
13 third heat exchanger
2 air pretreatment system
31 first heat exchanger
32 second heat exchanger
33 Water tank
34 thermostat
35 sewage tank
36 pump
37 stop valve
38 three-way valve
4 nitrogen gas separation system
41 film group
5 control system
Detailed Description
To make the purpose, technical solution and advantages of the present invention clearer, the following will combine the embodiments of the present invention and the corresponding drawings to clearly and completely describe the technical solution of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The technical solutions disclosed in the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
The embodiment of the application provides a nitrogen production device, which comprises an air compression system 1 and a waste heat recovery system; the air compression system 1 comprises an air compressor 11 and a liquid cooling motor 12 for driving the air compressor, wherein the liquid cooling motor 12 takes away heat generated by the motor through continuous flowing of a cooling medium, so as to achieve the purpose of cooling the motor, the cooling medium can be water or other media with lower temperature, for example, when the cooling medium adopts water, the corresponding motor can be a water cooling motor, the water cooling motor supplies power to the air compressor 11 through a peripheral power grid, and the air compressor 11 provides an air source for subsequent air pretreatment. The air compressor 11 is provided with a compressed air outlet, and the liquid cooling motor 12 is provided with a cooling liquid inlet and a cooling liquid outlet; the waste heat recovery system comprises a first heat exchanger 31, the first heat exchanger 31 is provided with a first heat exchange medium inlet 311, a first heat exchanger compressed air inlet 312, a first heat exchange medium outlet 314 and a first heat exchanger compressed air outlet 313, and a cooling liquid outlet is communicated with the first heat exchange medium inlet 311; the compressed air outlet is in communication with the first heat exchanger compressed air inlet 312.
In this embodiment, in order to improve the utilization rate of the cooling liquid, the temperature of the high-temperature liquid flowing out from the cooling liquid outlet of the liquid cooling motor 12 is reduced after the heat exchange is performed in the first heat exchanger 31, and the high-temperature liquid may flow out from the first heat exchange medium outlet 314 and then be introduced into the cooling liquid inlet to be used as the cooling liquid again.
Further, the waste heat recovery system may further include a storage tank 33, and the first heat exchange medium outlet 314 may be communicated with the cooling liquid inlet through the storage tank 33. By providing the storage tank 33, the coolant can be stored in the storage tank 33 so that the flow rate of the coolant can be adjusted according to the actual situation.
Further, the waste heat recovery system may further include a pump 36, the pump 36 being disposed between the storage tank 33 and the coolant inlet so as to pump the coolant in the storage tank 33 into the coolant inlet of the liquid-cooled motor 12 to cool the liquid-cooled motor 12.
Wherein a check valve 37 may be provided between the storage tank 33 and the cooling liquid inlet to prevent the liquid from flowing back into the storage tank 33.
In the embodiment of the application, in order to remove moisture, oil, solid particles and the like in the compressed air, the nitrogen making equipment may further comprise an air pretreatment system 2, wherein the air pretreatment system 2 comprises a pretreatment gas inlet and a pretreatment gas outlet, the compressed air outlet is communicated with the pretreatment gas inlet, and the pretreatment gas outlet is communicated with the compressed air inlet of the first heat exchanger. The air pretreatment system 2 mainly comprises a steam-water separator, a five-stage filter, a suction dryer or a cold dryer, and removes moisture, oil, solid particles and the like in compressed air through a series of filters.
Further, the air pretreatment system 2 may further include a drain outlet, and moisture, oil, solid particles, and the like separated by the air pretreatment system 2 may be discharged from the drain outlet. The waste heat recovery system can also comprise a second heat exchanger 32, the second heat exchanger 32 comprises a second heat exchange medium inlet, a second heat exchange medium outlet, a sewage inlet before heat exchange and a sewage outlet after heat exchange, the first heat exchange medium inlet and the second heat exchange medium inlet are communicated with the cooling liquid outlet simultaneously, and the sewage outlet is communicated with the sewage inlet before heat exchange. Through setting up second heat exchanger 32, can heat the sewage of following the drain of air pretreatment system 2 with the mode of heat transfer, prevent that sewage from freezing under low temperature environment.
In this embodiment, in order to achieve that the first heat exchange medium inlet and the second heat exchange medium inlet are communicated with the cooling liquid outlet at the same time, a three-way valve 38 may be provided, so that the cooling liquid outlet is communicated to the first heat exchange medium inlet and the second heat exchange medium inlet respectively through the three-way valve.
Further, the waste heat recovery system further comprises a sewage tank 35, the sewage outlet is communicated with the sewage tank 35 after heat exchange, so that sewage is stored through the sewage tank 35, and the sewage tank 35 is externally connected with a ball valve for periodic cleaning.
In this embodiment, the compressed air flowing out of the compressed air outlet of the air compressor 11 has a relatively high temperature, for example, the temperature may reach above 100 degrees celsius, so the air compression system 1 may further include a third heat exchanger 13 to cool the compressed air flowing out of the compressed air outlet of the air compressor 11. The third heat exchanger 13 may include a gas heat exchange pipe, a liquid heat exchange pipe, and a cooling medium passage configured to enable a cooling medium therein to exchange heat with a gas in the gas heat exchange pipe and a liquid in the liquid heat exchange pipe, respectively, and the compressed air outlet of the air compressor 11 and the pre-processing gas inlet of the air pre-processing system 2 are communicated through the gas heat exchange pipe. Specifically, in this embodiment, for example, the third heat exchanger 13 may be a plate-fin heat exchanger, and when the third heat exchanger 13 adopts the plate-fin heat exchanger, a motor in the plate-fin heat exchanger drives a fan blade to cool the gas in the gas heat exchange pipeline and the liquid in the liquid heat exchange pipeline of the third heat exchanger 13, for example, the gas in the gas heat exchange pipeline of the third heat exchanger 13 may be cooled to about 55 ℃, and the liquid in the liquid heat exchange pipeline may be cooled to 45 ℃ to 55 ℃. Then, the gas in the gas heat exchange pipeline of the cooled third heat exchanger 13 is further processed in the air pretreatment system 2, the temperature of the compressed air is reduced to-10 to 0 ℃ while the water vapor in the compressed air is removed by a cooling dryer in the air pretreatment system 2, and then the pretreated compressed air flows out through a pretreated gas outlet of the air pretreatment system 2, further flows into the first heat exchanger 31 through a first heat exchanger compressed air inlet of the first heat exchanger 31, and exchanges heat with the liquid (for example, the temperature may be about 50 ℃) flowing out from a cooling liquid outlet of the liquid cooling motor 12 in the first heat exchanger 31, so that the pretreated compressed air is heated to the temperature favorable for subsequent membrane separation, for example, the pretreated compressed air may be heated to about 30 ℃.
In the present embodiment, as the operation time of the liquid-cooling motor 12 is prolonged, the temperature of the liquid flowing out from the cooling liquid outlet of the liquid-cooling motor 12 is gradually increased, and the temperature is too high, which is unfavorable for the operation of the whole apparatus, so that, in order to avoid the temperature of the whole liquid circulation system of the nitrogen making apparatus being too high, the waste heat recovery system further includes a temperature detection element and a switching element, in the present embodiment, the temperature detection element and the switching element may be integrated into the thermostat 34; the liquid heat exchange pipeline comprises a liquid inlet and a liquid outlet, and the liquid outlet is communicated to the cooling liquid inlet; when the temperature detection element and the switching element are integrated into the thermostat 34, the thermostat 34 comprises a thermostat inlet, a thermostat first outlet and a thermostat second outlet, the thermostat inlet is communicated with the second heat exchange medium outlet, the thermostat first outlet is communicated with a liquid inlet of a liquid heat exchange pipeline of the third heat exchanger, and the thermostat second outlet is communicated to a cooling liquid inlet; the thermostat 34 is configured to open the thermostat first outlet while closing the thermostat second outlet when the temperature value fed back is above the set point and to open the thermostat second outlet while closing the thermostat first outlet when the temperature value fed back is below the set point. It will be understood by those skilled in the art that the thermostat second outlet communicating to the coolant inlet in this application includes both the thermostat second outlet communicating directly to the coolant inlet and the thermostat second outlet communicating to the coolant inlet through other means, such as the thermostat second outlet communicating to the coolant inlet through the storage tank 33. Therefore, the thermostat 34 ensures that the temperature of the whole liquid circulation system cannot be too high, and when the temperature exceeds the normal allowable range of the liquid cooling motor, the thermostat 34 is started to forcibly dissipate heat. In the thermostat 34, the temperature detection element is configured to detect the liquid temperature at the second heat exchange medium outlet, and feed back the temperature value to the switching element; the switching element is configured to communicate the second heat exchange medium outlet with the liquid inlet of the liquid heat exchange conduit of the third heat exchanger when the fed back temperature value is above a set value (e.g., 60 ℃), and communicate the second heat exchange medium outlet with the coolant inlet when the fed back temperature value is below the set value, although it should be understood by those skilled in the art that the communication of the second heat exchange medium outlet with the coolant inlet in the present application includes both the communication of the second heat exchange medium outlet directly with the coolant inlet and the communication of the second heat exchange medium outlet with the coolant inlet through other components, for example, the communication of the second heat exchange medium outlet with the coolant inlet through the storage tank 33.
In this embodiment, the nitrogen generation apparatus may further include a nitrogen separation system 4; the nitrogen separation system 4 comprises a membrane group 41, the membrane group 41 comprises a membrane group inlet and a membrane group outlet, the membrane group inlet is communicated with the compressed air outlet of the first heat exchanger, and the membrane group 41 can be a hollow fiber membrane. Thus, the compressed air flowing out of the compressed air outlet of the first heat exchanger, for example, at a temperature of about 30 ℃ enters the membrane module 41 through the inlet of the membrane module, and the compressed air at the temperature has good separation efficiency in the membrane module 41, that is, in the present application, by heating the compressed air in the first heat exchanger 31, the compressed air can be made to reach a temperature that is favorable for improving N2The membrane inlet temperature for separation efficiency. An oxygen analyzer can be arranged at the nitrogen outlet, the nitrogen separation system 4 separates nitrogen through a hollow fiber membrane, and the measured value of the oxygen analyzer on the manifold is used for calculating N2Concentration according to N2The concentration control valve is opened and closed, thereby controlling the flow direction of nitrogen and the evacuation of the oxygen-enriched air.
It should be understood that the temperatures described in the above embodiments are illustrative and not intended to limit the present application, and one of ordinary skill in the art can flexibly select different temperatures as needed.
Further, nitrogen making equipment can also include control system 5, and control system 5 respectively with compressed air system 1, air pretreatment system 2, waste heat recovery system and 4 communication connection of nitrogen gas separation system, control system 5 is used for controlling and check out test set each item parameter, including system start-stop, pressure measurement, temperature detection, nitrogen gas purity's detection, flow detection etc. mainly used for controlling the discharge capacity of nitrogen gas and the start-stop of circulating pump.
In order to facilitate the movement of the equipment, in this embodiment, the whole set of nitrogen making equipment can be installed on the chassis truck, so that the movement performance of the equipment is improved.
The utility model discloses what the key description in the above embodiment is different between each embodiment, and different optimization characteristics are as long as not contradictory between each embodiment, all can make up and form more preferred embodiment, consider that the literary composition is succinct, then no longer describe here.
The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (13)
1. The nitrogen production equipment is characterized by comprising an air compression system and a waste heat recovery system;
the air compression system comprises an air compressor and a liquid cooling motor for driving the air compressor, wherein the air compressor is provided with a compressed air outlet, and the liquid cooling motor is provided with a cooling liquid inlet and a cooling liquid outlet;
the waste heat recovery system comprises a first heat exchanger, the first heat exchanger is provided with a first heat exchange medium inlet, a first heat exchanger compressed air inlet, a first heat exchange medium outlet and a first heat exchanger compressed air outlet, and the cooling liquid outlet is communicated with the first heat exchange medium inlet;
the compressed air outlet is communicated with the compressed air inlet of the first heat exchanger.
2. The nitrogen plant of claim 1, wherein the first heat exchange medium outlet is in communication with the coolant inlet.
3. The nitrogen plant of claim 2, wherein the waste heat recovery system further comprises a storage tank, the first heat exchange medium outlet being in communication with the coolant inlet via the storage tank.
4. The nitrogen plant of claim 3, wherein the waste heat recovery system further comprises a pump disposed on a conduit between the storage tank and the coolant inlet.
5. The nitrogen plant according to claim 3, wherein a check valve is provided between the storage tank and the coolant inlet.
6. The nitrogen plant of claim 1, further comprising: the air pretreatment system comprises a pretreatment gas inlet and a pretreatment gas outlet, the compressed air outlet is communicated with the pretreatment gas inlet, and the pretreatment gas outlet is communicated with the compressed air inlet of the first heat exchanger.
7. The nitrogen making equipment according to claim 6, wherein the air pretreatment system further comprises a sewage drain, the waste heat recovery system further comprises a second heat exchanger, the second heat exchanger comprises a second heat exchange medium inlet, a second heat exchange medium outlet, a sewage inlet before heat exchange and a sewage outlet after heat exchange, the first heat exchange medium inlet and the second heat exchange medium inlet are communicated with the coolant outlet simultaneously, and the sewage drain is communicated with the sewage inlet before heat exchange.
8. The nitrogen plant of claim 7, wherein the coolant outlet is connected to the first heat exchange medium inlet and the second heat exchange medium inlet by a three-way valve, respectively.
9. The nitrogen plant of claim 7, wherein the waste heat recovery system further comprises a waste water tank;
and the sewage outlet after heat exchange is communicated with the sewage tank.
10. The nitrogen plant of claim 7, wherein the air compression system further comprises a third heat exchanger comprising a gas heat exchange conduit, a liquid heat exchange conduit, and a cooling medium passage configured to enable a cooling medium therein to exchange heat with a gas in the gas heat exchange conduit and a liquid in the liquid heat exchange conduit, respectively, the compressed air outlet and the pre-process gas inlet being in communication through the gas heat exchange conduit.
11. The nitrogen plant according to claim 10, wherein the waste heat recovery system further comprises a temperature detection element and a switching element;
the liquid heat exchange pipeline comprises a liquid inlet and a liquid outlet, and the liquid outlet is communicated to the cooling liquid inlet;
the temperature detection element is communicated with the second heat exchange medium outlet and is configured to detect the temperature of the liquid at the second heat exchange medium outlet and feed back the temperature value to the switching element;
the switching element is configured to enable the second heat exchange medium outlet to be communicated with the liquid inlet of the liquid heat exchange pipeline of the third heat exchanger when the fed-back temperature value is higher than a set value, and enable the second heat exchange medium outlet to be communicated with the cooling liquid inlet when the fed-back temperature value is lower than the set value.
12. The nitrogen-generating plant of claim 11, wherein the temperature-sensing element and the switching element are integrated into a thermostat comprising a thermostat inlet in communication with a second heat exchange medium outlet, a thermostat first outlet in communication with an inlet port of the liquid heat exchange conduit of the third heat exchanger, and a thermostat second outlet in communication with the coolant inlet;
the thermostat is configured to open the thermostat first outlet while closing the thermostat second outlet when the fed back temperature value is above a set point and to open the thermostat second outlet while closing the thermostat first outlet when the fed back temperature value is below the set point.
13. The nitrogen-generating facility of claim 1, further comprising a nitrogen separation system;
the nitrogen separation system comprises a membrane group, the membrane group comprises a membrane group inlet and a membrane group outlet, and the membrane group inlet is communicated with the compressed air outlet of the first heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023005424.7U CN214223555U (en) | 2020-12-14 | 2020-12-14 | Nitrogen production equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023005424.7U CN214223555U (en) | 2020-12-14 | 2020-12-14 | Nitrogen production equipment |
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| Publication Number | Publication Date |
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| CN214223555U true CN214223555U (en) | 2021-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023005424.7U Active CN214223555U (en) | 2020-12-14 | 2020-12-14 | Nitrogen production equipment |
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| Country | Link |
|---|---|
| CN (1) | CN214223555U (en) |
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2020
- 2020-12-14 CN CN202023005424.7U patent/CN214223555U/en active Active
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