CN210463759U - System for compressing gas by using waste cold assisted liquefaction cycle - Google Patents
System for compressing gas by using waste cold assisted liquefaction cycle Download PDFInfo
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- CN210463759U CN210463759U CN201921264348.6U CN201921264348U CN210463759U CN 210463759 U CN210463759 U CN 210463759U CN 201921264348 U CN201921264348 U CN 201921264348U CN 210463759 U CN210463759 U CN 210463759U
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- heat exchanger
- gas
- supply unit
- fluid passage
- target gas
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- 239000002699 waste material Substances 0.000 title claims abstract description 27
- 239000007789 gas Substances 0.000 claims abstract description 156
- 239000012530 fluid Substances 0.000 claims abstract description 101
- 238000004891 communication Methods 0.000 claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 239000002918 waste heat Substances 0.000 claims abstract description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 84
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 claims description 57
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 claims description 53
- 239000007788 liquid Substances 0.000 claims description 53
- 229910052757 nitrogen Inorganic materials 0.000 claims description 35
- 230000006835 compression Effects 0.000 claims description 15
- 238000007906 compression Methods 0.000 claims description 15
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 14
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 5
- 239000005977 Ethylene Substances 0.000 claims description 5
- 231100001261 hazardous Toxicity 0.000 claims description 5
- 238000002309 gasification Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The utility model provides a system for compressing gas by using waste cold auxiliary liquefaction circulation, which comprises a target gas supply unit (10) for supplying target gas under normal temperature and normal pressure, a first heat exchanger (20), a second heat exchanger (30), a booster pump (40) and a waste cold supply unit (50); a target gas supply unit (10), a first fluid passage of a first heat exchanger (20), a first fluid passage of a second heat exchanger (30), a booster pump (40), and a second fluid passage of the first heat exchanger (20) are in serial fluid communication, constituting a cooling liquefaction-pressurization unit for cooling and compressing the target gas to a desired pressure; the waste heat supply unit (50) is in fluid communication with the second fluid passage of the second heat exchanger (30) for supplying cooling energy to the second heat exchanger. In the present invention, by utilizing waste cooling, it is possible to contribute to reduction of energy, such as electric power, required for cooling and compressing gas.
Description
Technical Field
The utility model belongs to the gas compression field especially relates to utilize useless cold supplementary liquefaction circulation to come the system of compressed gas especially dangerous gas.
Background
In chemical production processes, when it comes to the use of high pressure gases (e.g. ethylene, acetylene, etc.), the gases are often compressed to high pressure using a compressor. During gas compression, the temperature of the gas is often elevated, resulting in potential risks, such as causing ethylene or acetylene gas leak explosions. Meanwhile, since gas compression is close to adiabatic compression, a large amount of energy is consumed.
In addition, in the chemical field, in order to obtain nitrogen gas in a factory, liquid nitrogen is generally gasified directly with air, which results in waste of cold energy of the liquid nitrogen.
Disclosure of Invention
The utility model aims at making full use of the useless cold in the mill, especially the useless cold of liquid nitrogen, through new liquefaction circulation compression target gas for example easily fire explosive gas to showing and reducing the required electric power of compression target gas, making gaseous compression safer simultaneously.
Therefore, the utility model provides a system for utilize useless cold auxiliary liquefaction circulation to come compressed gas, including the target gas supply unit that is used for supplying the target gas under normal atmospheric temperature and pressure, first heat exchanger, second heat exchanger, booster pump and useless cold supply unit; the target gas supply unit, the first fluid passage of the first heat exchanger, the first fluid passage of the second heat exchanger, the booster pump, and the second fluid passage of the first heat exchanger are in fluid communication in sequence, constituting a cooling liquefaction-pressurization unit for cooling and compressing the target gas to a desired pressure; the waste cold supply unit is in fluid communication with the second fluid passage of the second heat exchanger for supplying cold to the second heat exchanger. Through above-mentioned system, can effectively utilize useless cold to compress the target gas to show the required electric power of reduction target gas, make the compression of gas safer simultaneously.
In the present invention, it is advantageous that the waste cold supply unit may be a liquid nitrogen supply unit for supplying liquid nitrogen, which constitutes a liquid nitrogen gasification unit in combination with the second heat exchanger, for gasifying the liquid nitrogen from the liquid nitrogen supply unit into nitrogen gas.
In an aspect of the present invention, the system for compressing gas using waste cold assisted liquefaction cycle may further include a first receiving unit in fluid communication with the second fluid passage of the second heat exchanger for receiving nitrogen gas gasified by the second heat exchanger.
According to an aspect of the present invention, the system for compressing gas using waste cold assisted liquefaction cycle further comprises a second receiving unit in fluid communication with the second fluid channel of the first heat exchanger for receiving compressed target gas.
In an aspect of the present invention, when the cooling capacity provided by the waste cold supply unit is insufficient, the system may further include an auxiliary compression unit, the auxiliary compression unit includes a third heat exchanger, a gas compressor, and a mixer having a first inlet and a second inlet, wherein an outlet of the gas compressor, a first fluid passage of the third heat exchanger, and the first inlet of the mixer are sequentially in fluid communication, a second fluid passage of the first heat exchanger is in fluid communication with the second inlet of the mixer, and wherein a second fluid passage of the third heat exchanger is in fluid communication with a second fluid passage of the second heat exchanger.
In the present invention, the system for compressing gas using the waste cold assisted liquefaction cycle may further include a third receiving unit in fluid communication with an outlet of the mixer, for receiving the target gas mixed by the mixer, and the gas compressor in the auxiliary compression unit may be connected to the target gas supply unit.
In the present invention, it is advantageous that the target gas in the system for compressing gas by using the waste cold assisted liquefaction cycle may be a hazardous gas of acetylene, ethylene, or the like.
The present application also relates to a method for compressing a target gas by the above system for compressing a gas, comprising the steps of: passing a target gas stream from a target gas supply unit through a first fluid passage of a first heat exchanger to reduce the temperature of or at least partially liquefy the target gas; supplying cold energy to the second heat exchanger through the waste cold supply unit while passing the cooled target gas or the at least partially liquefied target gas through the first fluid passage of the second heat exchanger, the target gas or the at least partially liquefied target gas absorbing the cold energy to further lower its temperature, thereby being completely liquefied; passing the liquefied target gas from the second heat exchanger through a booster pump and pressurizing it to a desired pressure by the booster pump; and passing the pressurized liquefied target gas through the second fluid passage of the first heat exchanger, absorbing heat from the target gas stream of the first fluid passage of the first heat exchanger, and becoming a compressed target gas stream or a partially liquefied target gas.
In this application, the waste cold supply unit may be a liquid nitrogen supply unit for supplying liquid nitrogen, the liquid nitrogen fluid from the liquid nitrogen supply unit passes through the second fluid channel of the second heat exchanger, the liquid nitrogen absorbs the heat of the target gas or the at least partially liquefied target gas to be heated and gasified into nitrogen gas, and the target gas or the at least partially liquefied target gas absorbs the cold of the liquid nitrogen.
In one aspect, the method of the present application further comprises the steps of: flowing nitrogen from the second heat exchanger into a first receiving unit; and flowing the compressed target gas stream or the partially liquefied target gas from the second fluid channel of the first heat exchanger into a second receiving unit.
In one aspect, the method of the present application further comprises the steps of: compressing the target gas stream through the gas compressor to pressurize to a desired pressure; passing a nitrogen gas stream from the second fluid passage of the second heat exchanger through the second fluid passage of a third heat exchanger while passing a compressed target gas stream from the outlet of the gas compressor through the first fluid passage of the third heat exchanger to reduce the temperature of the compressed target gas stream while increasing the temperature of the nitrogen gas stream; flowing the target gas from the first fluid channel of the third heat exchanger through the first inlet of the mixer into the mixer; passing the compressed target gas or partially liquefied target gas from the second fluid passage of the first heat exchanger into the mixer through the second inlet of the mixer; and mixing the target gas stream from the first fluid channel of the third heat exchanger and the compressed target gas or partially liquefied target gas from the second fluid channel of the first heat exchanger in the mixer to obtain the target gas having the desired pressure and temperature.
In one aspect of the above method, further comprising a step of flowing the target gas mixed by the mixer into a third receiving unit.
In the present application, by utilizing waste heat, it is possible to contribute to a reduction in energy, such as electric power, required for compressing gas, such as hazardous gas. Also, with the system according to the present application, hazardous gases can be compressed more safely.
The core principle of the application is as follows: the gas is not directly compressed, but the gas is liquefied into liquid, the liquid is pressurized by a booster pump, and then the pressurized liquid is heated and gasified. Because the liquefied liquid has a low temperature, the danger of explosion is greatly reduced, and the liquid has the characteristic close to that of incompressible fluid, so that the energy consumption for compressing the liquid is far less than that of gas (about one hundredth to one tenth depending on the physical properties) under the same pressure ratio.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
FIG. 1 is a schematic diagram of one embodiment of a system for compressing gas using an exhaust cold assisted liquefaction cycle in accordance with the present invention;
FIG. 2 is a schematic diagram of another embodiment of a system for compressing gas using an exhaust cold assisted liquefaction cycle in accordance with the present invention;
FIG. 3 is a schematic diagram of yet another embodiment of a system for compressing gas using a waste cold assisted liquefaction cycle in accordance with the present invention; and
fig. 4 is a schematic diagram of another embodiment of a system for compressing gas using an exhaust cold assisted liquefaction cycle in accordance with the present invention.
Detailed Description
A system for compressing gas using a waste cold assisted liquefaction cycle according to an implementation of the present invention will now be described by way of example with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention to those skilled in the art. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. Furthermore, it is to be understood that the invention is not to be limited to the specific embodiments described. Rather, any combination of the following features and elements, whether related to different embodiments or not, is contemplated to implement the present invention.
Fig. 1 illustrates one embodiment of a system for compressing gas using an exhaust cold assisted liquefaction cycle in accordance with the present invention. As can be seen from the drawing, the system for compressing gas using the waste heat auxiliary liquefaction cycle may include a target gas supply device 10 for supplying a target gas at normal temperature and pressure, a first heat exchanger 20, a second heat exchanger 30, a booster pump 40, and a waste heat supply unit 50. The first heat exchanger 20 and the second heat exchanger 30 have the same or similar structure, and each has a hot fluid passage, i.e., a first fluid passage; and a cold fluid passage, i.e., a second fluid passage. The first and second fluid passages are sealed from each other so that fluids passing therethrough do not directly contact each other. In this embodiment, the target gas supply device 10, the first fluid passage of the first heat exchanger 20, the first fluid passage of the second heat exchanger 30, the booster pump 40, and the second fluid passage of the first heat exchanger 20 are sequentially in fluid communication to constitute a cooling-compressing unit for cooling and compressing the target gas to have a desired pressure and temperature, and the waste heat supply unit 50 is in fluid communication with the second fluid passage of the second heat exchanger 30 for supplying cold to the second heat exchanger.
In this embodiment, the waste cold supply unit is, for example, a liquid nitrogen supply unit for supplying liquid nitrogen, which constitutes a liquid nitrogen gasification unit in combination with the second heat exchanger 30, for gasifying the liquid nitrogen from the liquid nitrogen supply unit into nitrogen gas. In the utility model discloses in, liquid nitrogen also can replace for liquid ammonia.
The operation of the system for compressing gas using a waste cold assisted liquefaction cycle of figure 1 is illustrated below. Acetylene gas (C2H2) with the pressure of 1bar and the temperature of 32 ℃ is stored in the target gas supply unit 10, acetylene gas flow 0 is supplied into the first fluid channel of the first heat exchanger 20 at the flow rate of 1000kg/H, the temperature of the acetylene gas flow 0 is reduced to-85.24 ℃ after the acetylene gas flow 0 absorbs cold energy in the second fluid channel of the first heat exchanger 20, the acetylene gas is liquefied into acetylene liquid at the temperature, the flow rate is unchanged, and the acetylene liquid flow is marked as acetylene liquid flow 1; the acetylene liquid stream 1 then enters the first fluid channel of the second heat exchanger 30 and absorbs cold from the second fluid channel of the second heat exchanger 30, thereby further reducing the temperature to an acetylene liquid stream 2 at a temperature of-150 ℃; meanwhile, liquid nitrogen at-195.9 ℃ from the liquid nitrogen supply unit 50 flows through the second fluid passage of the second heat exchanger 30 at a flow rate of 2684kg/h, absorbs heat from the acetylene liquid stream 1, and is gasified into nitrogen at-160 ℃; next, the acetylene liquid stream 2 flows through the booster pump 40 and is pressurized by the booster pump to flow into the second fluid channel of the first heat exchanger 20, absorbs the heat of the acetylene gas stream 0 in the first fluid channel from the first heat exchanger, and is heated to the acetylene gas stream 4 at-63.74 ℃ and a pressure of 3 bar. The system converts liquid nitrogen into waste cold of nitrogen gas, and compared with the acetylene gas flow which is directly compressed by a gas compressor at normal temperature and normal pressure, the consumed electric power is obviously reduced by 99 percent, and the safety of the compressed acetylene gas is obviously improved.
It should be understood that in other alternatives, if the amount of cooling provided in the first heat exchanger is small, the acetylene gas flow 0 can be cooled to a lower temperature acetylene gas flow or partially liquefied acetylene gas after absorbing the cooling in the second fluid channel of the first heat exchanger 20, and these are also covered by the protection scope of the present application. In addition, the acetylene gas, i.e., a mixture of acetylene gas and liquid, which may also be partially liquefied, flows out of the second fluid passage of the first heat exchanger 20 according to the magnitude of the heat absorbed from the acetylene gas flow 0 in the first fluid passage of the first heat exchanger. The above alternatives are equally applicable to the embodiments described below.
FIG. 2 illustrates another embodiment of a system for compressing gas using an exhaust cold assisted liquefaction cycle in accordance with the present invention; the embodiment differs from the embodiment shown in fig. 1 in that the system further comprises a first receiving unit 60 in fluid communication with the second fluid path of the second heat exchanger 30 for receiving the low temperature nitrogen gas vaporized by the second heat exchanger 30. Also, the system may further include a second receiving unit 70, such as a reaction tank, in fluid communication with the second fluid passage of the first heat exchanger 20 for receiving a compressed target gas, such as acetylene gas.
FIG. 3 illustrates another embodiment of a system for compressing gas using an exhaust cold assisted liquefaction cycle in accordance with the present invention; which differs from the embodiment shown in fig. 1 in that the system further comprises an auxiliary compression unit. The provision of an auxiliary compression unit is advantageous, in particular when the cold supplied by the waste cold supply unit is insufficient to allow continuous operation of the system for compressing gas. As can be seen from the figure, the auxiliary compression unit comprises a third heat exchanger 90, a gas compressor 9, and a mixer 80 having a first inlet 80a and a second inlet 80b, wherein the outlet of the gas compressor 9, the first fluid path of the third heat exchanger 90 and the first inlet 80a of the mixer 80 are in sequential fluid communication, the second fluid path of the first heat exchanger 20 is in fluid communication with the second inlet 80b of the mixer 80, wherein the second fluid path of the third heat exchanger 90 is in fluid communication with the second fluid path of the second heat exchanger 30 for receiving a low temperature nitrogen gas stream.
Fig. 4 shows a further embodiment of a system for compressing gas using waste cold assisted liquefaction cycle according to the present invention, differing from the embodiment shown in fig. 3 only in that the system further comprises a third receiving unit, such as a reaction vessel (not shown), in fluid communication with the outlet of the mixer 80, for receiving the target gas mixed by the mixer, and the gas compressor 9 is connected to a target gas supply unit 10 supplying the target gas in a normal temperature and pressure state. In the present invention, the target gas is, for example, a hazardous gas selected from acetylene, ethylene, and the like.
The operation of the system for compressing gas using a waste cold assisted liquefaction cycle of figure 4 is illustrated below. Acetylene gas (C2H2) with the pressure of 1bar and the temperature of 32 ℃ is stored in the target gas supply unit 10, acetylene gas flow 0 is supplied into the first fluid channel of the first heat exchanger 20 at the flow rate of 1000kg/H, the temperature is reduced to-85.24 ℃ after the cold energy in the second fluid channel of the first heat exchanger 20 is absorbed, the acetylene gas is liquefied into acetylene liquid at the temperature, the flow rate is unchanged, and the acetylene liquid flow is marked as acetylene liquid flow 1; the acetylene liquid stream 1 then enters the first fluid channel of the second heat exchanger 30 and absorbs cold from the second fluid channel of the second heat exchanger 30, thereby further reducing the temperature to an acetylene liquid stream at a temperature of-150 ℃, labeled as acetylene liquid stream 2; meanwhile, liquid nitrogen at-195.9 ℃ from the liquid nitrogen supply unit 50 flows through the second fluid passage of the second heat exchanger 30 at a flow rate of 2684kg/h, absorbs heat from the acetylene liquid stream 1, and is gasified into nitrogen at-160 ℃; next, the acetylene liquid stream 2 flows through the booster pump 40 and is pressurized by the booster pump to flow into the second fluid channel of the first heat exchanger 20, absorbs the heat of the acetylene gas stream 0 from the first fluid channel of the first heat exchanger 20, is heated to-63.74 ℃, and the acetylene gas stream 4 with the pressure of 3bar is heated, and then the acetylene gas stream 4 enters the mixer through the first inlet 80a of the mixer 80; another acetylene gas, for example, acetylene gas flow 5 from the target gas supply unit 10 is introduced into the gas compressor 9 at a flow rate of 7000kg/h and directly compressed, the temperature of the compressed acetylene gas flow 6 is 118.4 ℃ and the pressure is 3bar, then the pressurized acetylene gas flow 6 enters the first fluid channel of the third heat exchanger 90, absorbs the cold energy of the low-temperature nitrogen gas (-160 ℃) passing through the second fluid channel of the third heat exchanger 90, the temperature is reduced to 78.81 ℃, and is marked as acetylene gas flow 7, the acetylene gas flow 7 then enters the mixer through the second inlet 80b of the mixer 80, and simultaneously, the temperature is increased to 30 ℃ after the low-temperature nitrogen gas absorbs the acetylene gas flow 6 passing through the first fluid channel of the third heat exchanger 90. The 3bar stream of acetylene gas 4 at-63.74 c from the first heat exchanger 20 was mixed with the 3bar stream of acetylene gas 7 at 78.81 c from the third heat exchanger, and a 3bar stream of acetylene gas at 29.88 c was output from the outlet of the mixer 80.
The above system, by using waste cooling converted from liquid nitrogen into nitrogen, consumes significantly less power, for example, 12% less power, than when acetylene gas stream at normal temperature and pressure is directly compressed by gas compressor.
Although the present invention has been described with reference to the preferred embodiments, the present invention is not limited thereto. Various changes and modifications can be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention is to be determined by the appended claims.
Claims (7)
1. A system for compressing gas using waste cold assisted liquefaction cycle, comprising a target gas supply unit (10) for supplying a target gas at normal temperature and pressure, a first heat exchanger (20), a second heat exchanger (30), a booster pump (40) and a waste cold supply unit (50);
the target gas supply unit (10), the first fluid passage of the first heat exchanger (20), the first fluid passage of the second heat exchanger (30), the booster pump (40), and the second fluid passage of the first heat exchanger (20) are sequentially in fluid communication, constituting a cooling liquefaction-pressurization unit for cooling and compressing the target gas to a desired pressure;
the waste heat supply unit (50) is in fluid communication with the second fluid path of the second heat exchanger (30) for supplying cooling energy to the second heat exchanger.
2. The system according to claim 1, wherein the waste cold supply unit is a liquid nitrogen supply unit for supplying liquid nitrogen, which constitutes a liquid nitrogen gasification unit in combination with the second heat exchanger, for gasifying the liquid nitrogen from the liquid nitrogen supply unit into nitrogen gas.
3. The system of claim 2, further comprising a first receiving unit (60) in fluid communication with the second fluid passage of the second heat exchanger (30) for receiving nitrogen gas vaporized by the second heat exchanger (30).
4. The system according to claim 1 or 2, further comprising a second receiving unit (70) in fluid communication with the second fluid passage of the first heat exchanger (20) for receiving the compressed target gas.
5. The system according to claim 1 or 2, further comprising an auxiliary compression unit comprising a third heat exchanger (90), a gas compressor (9), and a mixer (80) having a first inlet (80a) and a second inlet (80b), wherein the outlet of the gas compressor (9), the first fluid passage of the third heat exchanger (90), and the first inlet (80a) of the mixer (80) are in sequential fluid communication, the second fluid passage of the first heat exchanger (20) is in fluid communication with the second inlet (80b) of the mixer (80), wherein the second fluid passage of the third heat exchanger (90) is in fluid communication with the second fluid passage of the second heat exchanger (30).
6. The system according to claim 5, further comprising a third receiving unit in fluid communication with the outlet of the mixer (80) for receiving the target gas mixed by the mixer, and the gas compressor (9) is connected to the target gas supply unit (10).
7. The system of claim 1 or 2, wherein the target gas is a hazardous gas selected from acetylene or ethylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921264348.6U CN210463759U (en) | 2019-08-06 | 2019-08-06 | System for compressing gas by using waste cold assisted liquefaction cycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921264348.6U CN210463759U (en) | 2019-08-06 | 2019-08-06 | System for compressing gas by using waste cold assisted liquefaction cycle |
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| Publication Number | Publication Date |
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| CN210463759U true CN210463759U (en) | 2020-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921264348.6U Withdrawn - After Issue CN210463759U (en) | 2019-08-06 | 2019-08-06 | System for compressing gas by using waste cold assisted liquefaction cycle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110332763A (en) * | 2019-08-06 | 2019-10-15 | 巴斯夫新材料有限公司 | Using useless cold auxiliary liquefaction cycle come the system and method for compressed gas |
-
2019
- 2019-08-06 CN CN201921264348.6U patent/CN210463759U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110332763A (en) * | 2019-08-06 | 2019-10-15 | 巴斯夫新材料有限公司 | Using useless cold auxiliary liquefaction cycle come the system and method for compressed gas |
| CN110332763B (en) * | 2019-08-06 | 2024-03-29 | 巴斯夫新材料有限公司 | System and method for compressing gas using waste refrigeration assisted liquefaction cycle |
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