CN213285982U - Nitrogen recovery system - Google Patents
Nitrogen recovery system Download PDFInfo
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- CN213285982U CN213285982U CN202021318862.6U CN202021318862U CN213285982U CN 213285982 U CN213285982 U CN 213285982U CN 202021318862 U CN202021318862 U CN 202021318862U CN 213285982 U CN213285982 U CN 213285982U
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Abstract
The utility model provides a nitrogen gas recovery system belongs to nitrogen gas recovery plant technical field. It has solved the problem that current nitrogen gas recovery plant does not have the waste heat recovery function. The utility model relates to a nitrogen gas recovery system includes gasification subassembly, recoverer, filters constant voltage subassembly and foundry furnace. Wherein, through nitrogen gas recovery system's theory of operation, realized this nitrogen gas recovery system to the used repeatedly of nitrogen gas to realize the recycle of this nitrogen gas waste heat, thereby reduce the energy resource consumption of this nitrogen gas recovery system in the use, secondly, the inside of filtering the constant voltage subassembly is in the constant voltage state all the time, in order to guarantee that this nitrogen gas maintains the gas state all the time, thereby guarantees the stability of nitrogen gas in the filtering process.
Description
Technical Field
The utility model belongs to the technical field of nitrogen gas recovery plant, a nitrogen gas recovery system is related to.
Background
The low-pressure casting molding is a technological method for forming a casting by completing the processes of filling and solidifying liquid metal under the action of gas pressure, and is a molding technological method which is most applied to the existing non-ferrous metal molding structural part. In the low-pressure casting process, air is used as a compressed air source, so that a plurality of problems exist, firstly, oxygen in the air forms an oxide layer on the surface of the aluminum liquid, and the heat preservation effect of the aluminum liquid in the furnace is reduced; secondly, oxide layer impurities are mixed into the aluminum liquid, so that the quality of the product is influenced; thirdly, water molecules in the air generate hydrogen through high-temperature reaction, pinholes can be generated on the surface of the product, flaws are generated in the surface treatment of the finished product, the strength of the product is reduced, and the appearance of the product is influenced. Therefore, the inert gas such as nitrogen is used for replacing air for pressurization, so that the surface oxidation of the product can be greatly reduced, and the inert gas is the current low-pressure casting molding compressed gas and a main replacement gas source. However, nitrogen is expensive, so people often need to recycle the nitrogen to reduce the production cost of products, but the temperature of the gas exhausted from the low-pressure casting furnace is up to 300 degrees C, and the nitrogen cannot be recycled by simple equipment such as an air compressor, so that the production cost is too high.
Disclosure of Invention
The utility model aims at having the above-mentioned problem to current technique, provided a nitrogen gas recovery system with waste heat recovery function.
The purpose of the utility model can be realized by the following technical proposal: a nitrogen recovery system comprising:
a gasification assembly;
the input end of the recoverer is communicated with the gasification assembly, the output end of the recoverer is connected with a filtering constant-pressure assembly, and the filtering constant-pressure assembly is communicated with the gasification assembly; the retriever comprises: the side surface of the shell is surrounded with a heat insulation shell, the heat storage component penetrates through the shell, one end of the heat insulation shell is provided with a first air pipe and a third air pipe which are respectively communicated with the heat storage component, the other end of the heat insulation shell is provided with a second air pipe and a fourth air pipe which are respectively communicated with the heat storage component, and the second air pipe and the third air pipe are both communicated with the casting furnace;
the foundry furnace is arranged on one side of the recoverer, and two ends of the recoverer are communicated with the foundry furnace.
In a foretell nitrogen gas recovery system, filter the constant voltage subassembly and include holding vessel, booster compressor and install the pressure sensor on the holding vessel, pressure sensor is connected with the booster compressor electricity, the holding vessel with the recoverer intercommunication, the holding vessel with the booster compressor intercommunication, the booster compressor with the gasification subassembly intercommunication.
In the above-described nitrogen recovery system, a first filter is provided between the storage tank and the supercharger, one end of the first filter is communicated with the storage tank, and the other end of the first filter is communicated with the supercharger.
In the above-mentioned nitrogen gas recovery system, second filter, third filter and check valve have connected gradually between booster compressor and the buffer tank, the second filter communicates with the booster compressor, the second filter communicates with the third filter, the third filter communicates with the check valve, the check valve communicates with the gasification subassembly.
In foretell nitrogen gas recovery system, the gasification subassembly includes liquid nitrogen container, vaporizer and buffer tank, be equipped with the relief pressure valve on the liquid nitrogen container, the relief pressure valve communicates with the vaporizer, the vaporizer with the buffer tank intercommunication.
In the above nitrogen recovery system, a pressure gauge electrically connected to the pressure reducing valve is disposed on the buffer tank, a safety valve is disposed on the buffer tank, and the check valve is communicated with the buffer tank.
In the above nitrogen recovery system, a flow meter and a left electromagnetic valve are sequentially connected between the buffer tank and the recoverer, the flow meter is communicated with the buffer tank, the flow meter is communicated with the left electromagnetic valve, and the left electromagnetic valve is communicated with one end of the recoverer.
In the above nitrogen recovery system, a right electromagnetic valve is connected between the recoverer and the storage tank, the right electromagnetic valve is communicated with the recoverer, and the right electromagnetic valve is communicated with the storage tank.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model discloses in, through nitrogen gas recovery system's operation process, realized this nitrogen gas recovery system to the used repeatedly of nitrogen gas to realize the recycle of this nitrogen gas waste heat, thereby reduce the energy resource consumption of this nitrogen gas recovery system in the use.
2. The inside of filtering constant voltage subassembly is in the constant voltage state all the time to guarantee that this nitrogen gas remains the gaseous state all the time, thereby guarantee the stability of nitrogen gas in filtering process.
3. First filter carries out the dust to nitrogen gas and filters to make this nitrogen gas can pass the booster compressor smoothly, avoid the dust of mixing in the nitrogen gas to plug up the booster compressor, so, alright guarantee that this booster compressor can normally work.
4. After the nitrogen passes through the supercharger, the nitrogen sequentially passes through the second filter, the third filter and the one-way valve and is finally input into the gasification assembly, and in the process, the second filter and the third filter can filter oil mist in the nitrogen to further purify the nitrogen, so that the purity of the nitrogen is further ensured.
5. Be equipped with the insulating layer between heat accumulation subassembly and the casing, the setting of this insulating layer reduces the heat in the heat accumulation subassembly and gives off to the external world through the casing to guarantee nitrogen gas waste heat recovery's efficiency.
Drawings
Fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention.
Fig. 2 is a schematic view of the structure of the recycler.
Fig. 3 is a schematic view of the internal structure of the recycler.
Detailed Description
The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
As shown in fig. 1 to 3, the nitrogen recovery system of the present invention includes a gasification module 100, a recovery module 300, a filtering constant pressure module 200, and a casting furnace 400.
The utility model discloses in, all communicate through the pipeline between the one end of first filter 230 and the holding vessel 210, between the other end of first filter 230 and booster 220, between second filter 240 and third filter 250, between third filter 250 and check valve 260, between relief valve 111 and vaporizer 120, between vaporizer 120 and buffer tank 130, between check valve 260 and buffer tank 130, between flowmeter 140 and left solenoid valve 341 a.
The input end of the recoverer 300 is communicated with the gasification assembly 100, the output end of the recoverer 300 is connected with the filtering constant pressure assembly 200, the filtering constant pressure assembly 200 is communicated with the gasification assembly 100, the casting furnace 400 is arranged at one side of the recoverer 300, two ends of the recoverer 300 are both communicated with the casting furnace 400, before the recovery device works, liquid nitrogen is converted into nitrogen by the gasification assembly 100, when the recovery device works, the nitrogen is introduced into the recoverer 300, the inside of the recoverer 300 is in a high-temperature state at the moment, the nitrogen passing through the recoverer 300 is changed from low temperature to high temperature, meanwhile, the temperature in the recoverer 300 is changed from high temperature to low temperature, then, the high-temperature nitrogen enters the casting furnace 400, thereby reducing the process that the casting furnace 400 heats the low-temperature nitrogen again, thus, the working efficiency of the casting furnace 400 on workpieces is effectively improved, secondly, the energy consumption, high-temperature nitrogen in the casting furnace 400 is introduced into the recoverer 300 and exchanges heat with air in the recoverer 300, so that the temperature in the recoverer 300 rises, the temperature of the nitrogen entering the recoverer 300 falls, and then the nitrogen after temperature reduction enters the gasification assembly 100 through the filtering constant-pressure assembly 200, so that the low-temperature nitrogen can be reused, and in the process that the nitrogen passes through the filtering constant-pressure assembly 200, the filtering constant-pressure assembly 200 can filter dust and oil stains on the nitrogen, so that the purity of the nitrogen is ensured, and the nitrogen can be reused; secondly, the inside of the filtering constant voltage assembly 200 is always in a constant voltage state to ensure that the nitrogen is always maintained in a gas state, thereby ensuring the stability of the nitrogen in the filtering process.
The filtering constant pressure assembly 200 comprises a storage tank 210, a supercharger 220 and a pressure sensor 211 arranged on the storage tank, wherein the pressure sensor is electrically connected with the supercharger, the storage tank is communicated with the recoverer, the storage tank is communicated with the supercharger, the supercharger is communicated with the gasification assembly, the pressure sensor 211 electrically connected with the supercharger 220 is arranged on the storage tank 210, the pressure sensor 211 detects the air pressure in the storage tank 210 at any time, when the pressure detected by the pressure sensor 211 is smaller than the preset value of the pressure sensor 211, the supercharger 220 reduces the flow of the passing nitrogen or the supercharger 220 is closed, when the pressure detected by the pressure sensor 211 is larger than the preset value of the pressure sensor 211, the supercharger 220 increases the flow of the passing nitrogen, thereby quickly reducing the pressure in the storage tank 210, and thus ensuring that the filtering constant pressure assembly 200 works, is always in a constant pressure state, thereby ensuring the stability of the nitrogen in the filtering process.
In the present invention, the first filter 230 is preferably a T-stage main line filter.
Be equipped with first filter 230 between holding vessel 210 and the booster compressor 220, the one end and the holding vessel 210 intercommunication of first filter 230, the other end and the booster compressor 220 intercommunication of first filter 230, holding vessel 210 is letting in cryogenic nitrogen gas to the in-process of booster compressor 220, first filter 230 carries out dust filtration to nitrogen gas to make this nitrogen gas can pass booster compressor 220 smoothly, avoid the dust of mixing in the nitrogen gas to plug up booster compressor 220, so, alright guarantee this booster compressor 220 can normally work.
In the present invention, the second filter 240 is preferably a class a filter, and the third filter 250 is preferably a class D ultra high efficiency filter.
The second filter 240, the third filter 250 and the check valve 260 are sequentially connected between the booster 220 and the buffer tank 130, the second filter 240 is communicated with the booster 220, the second filter 240 is communicated with the third filter 250, the third filter 250 is communicated with the check valve 260, the check valve 260 is communicated with the gasification assembly 100, when nitrogen passes through the booster 220, the nitrogen sequentially passes through the second filter 240, the third filter 250 and the check valve 260 and is finally input into the gasification assembly 100, and in the process, the second filter 240 and the third filter 250 filter oil mist in the nitrogen, so that the nitrogen is further purified, and the purity of the nitrogen is further ensured.
The gasification assembly 100 comprises a liquid nitrogen tank 110, a gasifier 120 and a buffer tank 130, wherein a pressure reducing valve 111 is arranged on the liquid nitrogen tank 110, the pressure reducing valve 111 is communicated with the gasifier 120, the gasifier 120 is communicated with the buffer tank 130, during operation, the pressure reducing valve 111 is opened, liquid nitrogen stored in the liquid nitrogen tank 110 enters the gasifier 120 through the pressure reducing valve 111, then the gasifier 120 converts the liquid nitrogen into nitrogen and conveys the nitrogen into the buffer tank 130, and therefore conversion and conveying of fresh nitrogen can be completed.
Be equipped with the manometer 131 of being connected with relief pressure valve 111 electricity on the buffer tank 130, check valve 260 and buffer tank 130 intercommunication, when nitrogen gas through check valve 260 carries to the buffer tank 130 in, the number of degrees of manometer 131 changes, when the number of degrees of manometer 131 is less than people's default, people alright open relief pressure valve 111, so that fresh nitrogen gas supplements to the buffer tank 130 in, thereby make the nitrogen pressure in the buffer tank 130 can reach people's default, and then guarantee that the nitrogen pressure in this buffer tank 130 is in the constant state all the time.
The buffer tank 130 is provided with a safety valve 132, when the pressure input into the buffer tank 130 is greater than the preset value of the pressure gauge 131, the safety valve 132 is automatically opened, the pressure in the buffer tank 130 is reduced, the buffer tank 130 is prevented from exploding, and the safety is ensured.
Further, the pressure gauge 131 and the pressure sensor 211 are electrically connected to a control system (not labeled in the figure) suitable for the nitrogen recovery system, so that in the using process of the nitrogen recovery system, people only need to pass through the control system (not labeled in the figure) to observe the working states of the pressure gauge 131 and the pressure sensor 211, and people can adjust the nitrogen recovery system in time.
A flow meter 140 and a left electromagnetic valve 341a are sequentially connected between the buffer tank 130 and the recoverer 300, the flow meter 140 is communicated with the buffer tank 130, the flow meter 140 is communicated with the left electromagnetic valve 341a, the left electromagnetic valve 341a is communicated with one end of the recoverer 300, a right electromagnetic valve 332a is connected between the recoverer 300 and the storage tank 210, the right electromagnetic valve 332a is communicated with the recoverer 300, the left electromagnetic valve 341a needs to be opened when nitrogen is introduced into the casting furnace 400, the right electromagnetic valve 332a needs to be closed, so that the nitrogen in the buffer tank 130 sequentially passes through the flow meter 140 and the left electromagnetic valve 341a until the nitrogen enters the recoverer 300, and the interior of the recoverer 300 is in a high-temperature state at the moment, so that the nitrogen passing through the recoverer 300 is changed from a low temperature to a high temperature, and meanwhile, the temperature in the recoverer 300 is, then, the high-temperature nitrogen enters the casting furnace 400, so that the process that the casting furnace 400 heats the low-temperature nitrogen again is reduced, the work efficiency of the casting furnace 400 on the workpiece is effectively improved, and the energy consumption of the casting furnace 400 is reduced.
Further, the retriever 300 comprises: the side of the shell 310 is surrounded by a heat insulation shell 311, the heat storage component 320 is arranged in the shell 310 in a penetrating manner, one end of the heat insulation shell 311 is provided with a first air pipe 341 and a third air pipe 342 which are communicated with the heat storage component 320 respectively, the other end of the heat insulation shell 311 is provided with a second air pipe 331 and a fourth air pipe 332 which are communicated with the heat storage component 320 respectively, the second air pipe 331 and the third air pipe 342 are communicated with the casting furnace 400, the left electromagnetic valve 341a is arranged on the first air pipe 341, and the right electromagnetic valve 332a is arranged on the fourth air pipe 332.
Before work, people need to insert the second air pipe 331 and the third air pipe 342 into the casting furnace 400, when the casting furnace 400 discharges nitrogen, people need to close the left electromagnetic valve 341a and open the right electromagnetic valve 332a, at this time, high-temperature nitrogen in the casting furnace 400 is discharged through the third air pipe 342, then the high-temperature nitrogen passes through the heat accumulation component 320 in the shell 310, and a temperature difference exists between the temperature of the heat accumulation component 320 and the nitrogen entering the shell 310, so that heat exchange is carried out between the heat accumulation component 320 and the nitrogen, namely, the temperature of the heat accumulation component 320 is increased, the temperature of the nitrogen is reduced, and then low-temperature nitrogen is conveyed into the storage tank 210 through the fourth air pipe 332 to recover the nitrogen; when new nitrogen is to be filled into the casting furnace 400, the left electromagnetic valve 341a is opened, the right electromagnetic valve 332a is closed, so that the fresh nitrogen enters the heat storage component 320 through the first air pipe 341, the temperature of the heat storage component 320 at this time is higher than that of the new nitrogen, the nitrogen entering the heat storage component 320 at this time exchanges heat with the heat storage component 320, namely, the temperature of the nitrogen in the shell 310 is increased, the temperature of the heat storage component 320 is reduced, the heated nitrogen directly enters the casting furnace 400 through the second air pipe 331, so that the low-temperature nitrogen is prevented from entering the casting furnace 400, the temperature of the casting furnace is prevented from being reduced, namely, the gas in the casting furnace is prevented from being heated again by the casting furnace 400, and the energy-saving efficiency is achieved; secondly, through the setting of this thermal-insulated shell 311, avoid people when carrying this nitrogen gas recovery system, the condition that palm or finger were scalded by nitrogen gas recovery system.
A front mounting plate 311a is provided at one end of the heat insulating case 311, a front sealing plate 330 for connecting the second air pipe 331 and the fourth air pipe 332 is detachably connected to the front mounting plate 311a, a rear mounting plate 311b is provided at the other end of the heat insulating case 311, a rear sealing plate 340 for connecting the first air pipe 341 and the third air pipe 342 is detachably connected to the rear mounting plate 311b, sealing rings 350 are clamped between the rear mounting plate 311b and the rear sealing plate 340 and between the front mounting plate 311a and the front sealing plate 330, by the arrangement of the sealing ring 350, the sealing performance between the front mounting plate 311a and the front sealing plate 330 is effectively increased, so that the nitrogen gas located inside the heat insulating case 311 cannot leak from between the front mounting plate 311a and the front sealing plate 330, at the same time, the sealing property between the rear mounting plate 311b and the rear sealing plate 340 is also increased, so that nitrogen gas located inside the heat insulating case 311 cannot leak from between the rear mounting plate 311b and the rear sealing plate 340.
A heat insulation layer 312 is arranged between the heat storage component 320 and the shell 310, and the arrangement of the heat insulation layer 312 reduces the heat in the heat storage component 320 from being dissipated to the outside through the shell 310, so that the nitrogen waste heat recovery efficiency is ensured.
Two heat accumulation assemblies 320 are provided, a partition 312a is arranged between the two heat accumulation assemblies 320, the partition 312a is fixedly connected with the heat insulation layer 312, each heat accumulation assembly 320 comprises a plurality of heat accumulators 321, when in installation, each heat accumulator 321 needs to be installed in a corresponding position, when the front sealing plate 330 is in threaded connection with the front installation plate 311a, the partition 312a just divides the second air pipe 331 into an upper part and a lower part, so that the second air pipe 331 can simultaneously receive nitrogen gas discharged by the two heat accumulation assemblies 320, and meanwhile, the partition 312a also divides the fourth air pipe 332 into an upper part and a lower part, so that the fourth air pipe 332 can simultaneously receive nitrogen gas discharged by the two heat accumulation assemblies 320; when one connects the rear sealing plate 340 and the rear mounting plate 311b by screw thread, the partition 312a just divides the first air pipe 341 into two upper and lower parts, so that the nitrogen gas of the first air pipe 341 can be introduced into the two heat storage assemblies 320 at the same time, and at the same time, the partition 312a also divides the third air pipe 342 into two upper and lower parts, so that the nitrogen gas of the third air pipe 342 can be introduced into the two heat storage assemblies 320 at the same time.
The cross section of each heat accumulator 321 is cellular, so that nitrogen passing through the heat accumulator 321 can perform sufficient heat exchange with the heat accumulator 321 and the heat emission of the heat accumulator 321 is reduced.
Example two
The embodiment is a working principle of a nitrogen recovery system:
s1, opening the pressure reducing valve 111, and allowing the liquid nitrogen stored in the liquid nitrogen tank 110 to pass through the pressure reducing valve 111 and the gasifier 120 in sequence, so that the liquid nitrogen is converted into nitrogen and stored in the buffer tank 130, and the air pressure in the buffer tank 130 is increased;
s2, when the air pressure of the buffer tank 130 reaches the preset pressure value of the pressure gauge 131, the pressure reducing valve 111 and the right electromagnetic valve 332a are closed, the left electromagnetic valve 341a is opened, so that the nitrogen from the buffer tank 130 is introduced into the recoverer 300, at the moment, the recoverer 300 heats the nitrogen entering the recoverer 300, the heated nitrogen enters the casting furnace 400 through the second air pipe 331, and then the casting furnace 400 works;
s3, after the operation of the foundry furnace 400 is completed, the right electromagnetic valve 332a is opened, the left electromagnetic valve 341a is closed, the high-temperature nitrogen in the foundry furnace 400 is introduced into the recoverer 300, because the temperature of the nitrogen just discharged from the foundry furnace 400 is higher than the temperature of the recoverer 300 at this time, the recoverer 300 exchanges heat with the high-temperature nitrogen to reduce the temperature of the nitrogen, and then the nitrogen after temperature reduction passes through the storage tank 210, the first filter 230, the supercharger 220, the second filter 240, the third filter 250 and the check valve 260 in sequence and is finally conveyed into the buffer tank 130, so that the filtering constant pressure assembly 200 filters dust and oil mist in the nitrogen;
s4, repeating the step S2, so that the nitrogen can be recycled, and the consumption of the nitrogen is reduced;
and S5, when the air pressure in the buffer tank 130 is smaller than the preset pressure value of the pressure gauge 131, repeating the step S1.
Through the working principle of the nitrogen recovery system, the nitrogen recovery system can recycle nitrogen and recycle the waste heat of the nitrogen, so that the energy consumption of the nitrogen recovery system in the using process is reduced.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (8)
1. A nitrogen recovery system, comprising:
a gasification assembly;
the input end of the recoverer is communicated with the gasification assembly, the output end of the recoverer is connected with a filtering constant-pressure assembly, and the filtering constant-pressure assembly is communicated with the gasification assembly; the retriever comprises: the heat storage device comprises a shell and a heat storage assembly, wherein a heat insulation shell is arranged on the side surface of the shell in a surrounding manner, the heat storage assembly penetrates through the shell, a first air pipe and a third air pipe which are respectively communicated with the heat storage assembly are installed at one end of the heat insulation shell, and a second air pipe and a fourth air pipe which are respectively communicated with the heat storage assembly are installed at the other end of the heat insulation shell;
the foundry furnace is arranged on one side of the recoverer, two ends of the recoverer are communicated with the foundry furnace, and the second air pipe and the third air pipe are communicated with the foundry furnace.
2. The nitrogen recovery system of claim 1, wherein the filtration constant pressure assembly comprises a storage tank, a booster and a pressure sensor mounted on the storage tank, the pressure sensor is electrically connected to the booster, the storage tank is in communication with the recuperator, the storage tank is in communication with the booster, and the booster is in communication with the gasification assembly.
3. A nitrogen recovery system according to claim 2, wherein a first filter is provided between the storage tank and the booster, one end of the first filter is communicated with the storage tank, and the other end of the first filter is communicated with the booster.
4. The nitrogen recovery system according to claim 2, wherein a second filter, a third filter and a check valve are connected in sequence between the booster and the buffer tank, the second filter is communicated with the booster, the second filter is communicated with the third filter, the third filter is communicated with the check valve, and the check valve is communicated with the gasification module.
5. The nitrogen recovery system of claim 4, wherein the gasification assembly comprises a liquid nitrogen tank, a gasifier and a buffer tank, a pressure reducing valve is arranged on the liquid nitrogen tank, the pressure reducing valve is communicated with the gasifier, and the gasifier is communicated with the buffer tank.
6. A nitrogen recovery system as claimed in claim 5, wherein said buffer tank is provided with a pressure gauge electrically connected to a pressure reducing valve, said buffer tank is provided with a safety valve, and said check valve is communicated with said buffer tank.
7. The nitrogen recovery system of claim 5, wherein a flow meter and a left solenoid valve are sequentially connected between the buffer tank and the recoverer, the flow meter is communicated with the buffer tank, the flow meter is communicated with the left solenoid valve, and the left solenoid valve is communicated with one end of the recoverer.
8. The nitrogen recovery system of claim 2, wherein a right solenoid valve is connected between the recoverer and the storage tank, the right solenoid valve is in communication with the recoverer, and the right solenoid valve is in communication with the storage tank.
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| CN202021318862.6U CN213285982U (en) | 2020-07-07 | 2020-07-07 | Nitrogen recovery system |
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| CN202021318862.6U CN213285982U (en) | 2020-07-07 | 2020-07-07 | Nitrogen recovery system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111998225A (en) * | 2020-07-07 | 2020-11-27 | 金华职业技术学院 | High-temperature nitrogen recovery system and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111998225A (en) * | 2020-07-07 | 2020-11-27 | 金华职业技术学院 | High-temperature nitrogen recovery system and control method thereof |
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