CN212283440U - Rare gas purification device based on low-temperature cold source - Google Patents
Rare gas purification device based on low-temperature cold source Download PDFInfo
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- CN212283440U CN212283440U CN202020546118.5U CN202020546118U CN212283440U CN 212283440 U CN212283440 U CN 212283440U CN 202020546118 U CN202020546118 U CN 202020546118U CN 212283440 U CN212283440 U CN 212283440U
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Abstract
The utility model discloses a rare gas purification device based on low temperature cold source, the device includes vacuum hood (8), cryocooler (4), is equipped with backheating heat exchanger (1), solidification heat exchanger (3), cold head heat exchanger (2) and adsorber (7) in vacuum hood (8), wherein backheating heat exchanger (1) is linked together with mixed gas import pipe (10) and product gas outlet pipe (11) respectively; the regenerative heat exchanger (1) is connected with the curing heat exchanger (3) through an input pipeline and a return pipeline, and the curing heat exchanger (3) is connected with the cold head heat exchanger (2) through the input pipeline and the return pipeline; the adsorber (7) is arranged on an input pipeline on the front side or the rear side of the solidification heat exchanger (3); the cold head heat exchanger (2) is connected with a refrigerator cold head (6) of the low-temperature refrigerator (4) for heat exchange. The utility model discloses a purification device adopts the method that cryosorption combines the solidification for the application range of clarifier is wider, purification efficiency is higher.
Description
Technical Field
The utility model belongs to refrigeration and low temperature engineering field, specifically speaking are rare gas purification device based on low temperature cold source.
Background
The rare gas is widely applied to the fields of military industry, medical treatment, semiconductors, low-temperature superconduction and the like, such as helium and neon. These gases are very expensive, recycling of these gases is currently the focus, and gas purification is the key task for recycling.
The conventional gas purification methods are various, wherein a gas purifier based on a cryogenic refrigerator becomes a hot door in recent years, a two-stage cryogenic refrigerator is generally adopted to provide a cold source, part of impurities in feed gas are liquefied by using cold energy of a first stage of the refrigerator and liquid is discharged, and the rest part of impurity gas is condensed in a solidification heat exchanger by using cold energy provided by a second stage cold head, so that high-purity product gas is obtained, wherein the helium purifier is most typical. The helium purification device based on the refrigerating machine utilizes the primary cold energy to cool the raw material gas and then controls the temperature of the raw material gas to be about 65K, partial nitrogen and oxygen in impurities are liquefied, and the residual impurity gas is cooled to be below 38K by utilizing the secondary cold head cold energy of the refrigerating machine and solidified to obtain high-purity helium. Because the temperatures of the two nodes are 65K and 38K respectively, the helium purifier with the structure is relatively limited, and if the raw material gas contains more impurity gases with triple points lower than 65K, the purifier is easy to block at the position of the primary cold head; if the impurity components of the raw material gas are unstable and are higher in a period of time, the temperature of a primary cold head of the refrigerator is far higher than the set 65K, so that the impurities entering the solidification heat exchanger are increased, the impurity gas solidified in the solidification heat exchanger is increased quickly, the purifier is easily saturated, and the working efficiency is low; if the pressure boiling point of the process gas is higher than 38K, the process gas is generated as a liquid in the heat exchanger, and a part of solid impurities is inevitably dissolved in the liquid, so that a high-purity gas cannot be obtained.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a rare gas purification device based on low temperature cold source to traditional gas purification ware work efficiency low, to the air supply require high, handle the not enough of this three aspect of gaseous limitation.
The utility model aims at solving through the following technical scheme:
the utility model provides a rare gas purification device based on low temperature cold source which characterized in that: the device comprises a vacuum cover and a low-temperature refrigerator which is arranged on the vacuum cover and a cold head of the refrigerator extends into the vacuum cover, wherein a regenerative heat exchanger, a solidification heat exchanger, a cold head heat exchanger and an absorber are arranged in the vacuum cover, and the regenerative heat exchanger is respectively communicated with a mixed gas inlet pipe and a product gas outlet pipe which extend out of the vacuum cover; along the gas input direction, the regenerative heat exchanger is connected with the solidification heat exchanger and the cold head heat exchanger in sequence through an input pipeline; along the gas backflow direction, the cold head heat exchanger is sequentially connected with the curing heat exchanger and the regenerative heat exchanger through a backflow pipeline; the absorber is arranged on an input pipeline from the regenerative heat exchanger to the solidification heat exchanger or an input pipeline from the solidification heat exchanger to the cold-head heat exchanger; and the cold head heat exchanger is connected with the cold head of the refrigerator for heat exchange.
When the low-temperature refrigerator is a two-stage refrigerator, the primary cold head of the low-temperature refrigerator is connected with the absorber, so that the absorber can utilize the cold energy of the primary cold head, and the absorber is positioned on an input pipeline from the regenerative heat exchanger to the solidification heat exchanger.
The primary cold head is connected with the absorber through a high-heat-conductivity material.
The secondary cold head of the low-temperature refrigerator is a refrigerator cold head, and the cold head heat exchanger is connected with the refrigerator cold head so as to utilize the cold quantity of the refrigerator cold head.
When the low-temperature refrigerator is a primary refrigerator, the absorber is arranged on an input pipeline from the solidification heat exchanger to the cold head heat exchanger, and the cold head heat exchanger is connected with the cold head of the refrigerator so as to utilize the cold quantity of the cold head of the refrigerator.
When the low-temperature refrigerator is a primary refrigerator and the regenerative heat exchanger is connected to an input pipeline of the solidification heat exchanger, the absorber is positioned in the liquid nitrogen storage tank, and the cold head heat exchanger is connected with the cold head of the refrigerator so as to utilize the cold quantity of the cold head of the refrigerator.
The adsorption material filled in the adsorber adopts activated carbon or molecular sieve.
The cold head heat exchanger is made of a material with high heat conductivity.
The cold head heat exchanger is in the form of a slit type heat exchanger, a plate type heat exchanger or a wound tube type heat exchanger.
The utility model discloses a rare gas purification device's principle utilizes the difference of different gaseous saturation partial pressures under the difference, the same temperature of adsorber to impurity gas selectivity absorption, different gaseous triple point under the low temperature, with miscellaneous gas absorption or solidification, reaches the effect of purification.
Compared with the prior art, the utility model has the following advantages:
the rare gas purification device of the utility model adopts a method combining low-temperature adsorption and solidification, which can effectively improve the efficiency of the purifier, prolong the working time of the purifier and obtain ultra-pure rare gas; when the adsorber is arranged in front of the solidification heat exchanger, the gas is treated by the low-temperature adsorber and then passes through the solidification heat exchanger to remove impurities, so that high-purity gas is obtained, the impurity content in the feed gas can be higher, and the impurity types can be more; when the absorber is arranged behind the solidification heat exchanger, the gas firstly passes through the solidification heat exchanger to solidify part of impurity gas, and then passes through the low-temperature absorber to remove the impurity gas, so that the obtained high-purity gas can purify some special gases (such as neon gas), the temperature of the solidification heat exchanger is controlled to prevent the gas from being liquefied, part of impurities are solidified, and the rest small part of impurities are absorbed in the absorber at the rear end; the rare gas purification device is different from a purifier taking a traditional small-sized low-temperature refrigerator as a cold source, so that the purifier is wider in application range and higher in purification efficiency.
Drawings
Fig. 1 is a schematic flow chart of the rare gas purification device based on a low-temperature cold source for preparing high-purity helium according to the present invention;
fig. 2 is a schematic flow chart of the rare gas purification device based on a low-temperature cold source for preparing ultra-high purity helium gas according to the present invention;
fig. 3 is a schematic flow diagram of the rare gas purification device based on a low-temperature cold source for preparing high-purity neon according to the present invention.
Wherein: 1-regenerative heat exchanger; 2-cold head heat exchanger; 3-curing heat exchanger; 4-low temperature refrigerator; 5-first-stage cold head; 6-refrigerator cold head; 7-an adsorber; 8, a vacuum cover; 9-a liquid nitrogen storage tank; 10-mixed gas inlet pipe; 11-product gas outlet pipe.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
As shown in fig. 1-3, the utility model provides a rare gas purification device based on a low temperature cold source, which mainly comprises a set of low temperature refrigerator 4, an absorber 7, a regenerative heat exchanger 1, a solidification heat exchanger 3 and a cold head heat exchanger 2; the regenerative heat exchanger 1 comprises a cooling channel and a heating channel, the adsorber 7 comprises an inlet and an outlet, the curing heat exchanger 3 comprises a cooling channel and a heating channel, the cold-head heat exchanger 2 comprises an inlet and an outlet, the cooling channel outlet of the regenerative heat exchanger 1 is connected with the cooling channel inlet of the curing heat exchanger 3 through an input pipeline, the heating channel inlet of the regenerative heat exchanger 1 is connected with the heating channel outlet of the curing heat exchanger 3 through a return pipeline, the cooling channel outlet of the curing heat exchanger 3 is connected with the inlet of the cold-head heat exchanger 2 through an input pipeline, the heating channel inlet of the curing heat exchanger 3 is connected with the outlet of the cold-head heat exchanger 2 through a return pipeline, and the adsorber 7 is arranged on the input pipeline at the inlet side or the outlet side of the cooling channel of the; the adsorber 7 is filled with an adsorption material, and the adsorption material adopts activated carbon or molecular sieve.
When the low-temperature refrigerator 4 is a two-stage refrigerator, the absorber 7 is connected with the first-stage cold head 5 of the low-temperature refrigerator 4 through a high-thermal-conductivity material (such as oxygen-free copper), and the absorber 7 is cooled by utilizing the cold energy of the first-stage cold head 5 of the low-temperature refrigerator 4; the cold head heat exchanger 2 is connected with a second-stage cold head (a refrigerator cold head 6) of the low-temperature refrigerator 4 through a high-thermal-conductivity material (such as oxygen-free copper), the cold energy of the second-stage cold head of the low-temperature refrigerator 4 is utilized to cool the cold head heat exchanger 2, the cold head heat exchanger 2 is made of a material with high thermal conductivity, and the preferred scheme is oxygen-free copper or high-purity aluminum; the cold head heat exchanger 2 is in the form of a slit type heat exchanger, a plate type heat exchanger or a wound tube type heat exchanger.
When the low-temperature refrigerator 4 is a single-stage refrigerator, the cold head heat exchanger 2 is connected with the refrigerator cold head 6 and utilizes the cold energy of the cold head; the adsorber 7 is cooled by cold supplied by liquid nitrogen or by cryogenic gas in the pipeline.
Example one
As shown in fig. 1: the utility model discloses a during rare gas purification device preparation high-purity helium based on low temperature cold source, adsorber 7 utilizes the one-level cold head 5 cooling of cryocooler 4, and adsorber 7 sets up before solidification heat exchanger 3. The working process comprises the following steps: after entering a purification device from a mixed gas inlet pipe 10, a raw gas is firstly precooled through a temperature reduction channel of a regenerative heat exchanger 1, and enters an absorber 7 after being precooled to a lower temperature, the absorber 7 is cooled by a primary cold head 5 of a cryogenic refrigerator 4, a part of impurity gas is absorbed in the absorber 7, helium containing a small amount of impurity gas at an outlet of the absorber 7 enters a temperature reduction channel of a solidification heat exchanger 3, the helium is cooled to below 38K at an outlet of the temperature reduction channel of the solidification heat exchanger 3, most of impurity components are condensed in the solidification heat exchanger 3 and solidified on the inner surface of the solidification heat exchanger 3, the helium at the moment is high-purity helium, the high-purity helium passes through a cold head heat exchanger 2, the cold head heat exchanger 2 is provided with cold energy by a refrigerator cold head 6 (namely a secondary cold head of the cryogenic refrigerator 4), and enters a temperature rise channel of the solidification heat exchanger 3 after being further cooled, the high-purity helium at The mixed gas flowing from the cooling channel of the regenerative heat exchanger 1 exchanges heat and is output to the product gas outlet pipe 11 to obtain high-purity helium.
Example two
As shown in fig. 2: the utility model discloses a when rare gas purification device based on low temperature cold source prepares the super high purity helium, adsorber 7 utilizes the liquid nitrogen to provide the cold source, and adsorber 7 sets up before solidification heat exchanger 3. The working process comprises the following steps: after entering a purification device from a mixed gas inlet pipe 10, a raw gas is firstly precooled through a temperature reduction channel of a regenerative heat exchanger 1, and enters an absorber 7 after being precooled to a lower temperature, the absorber 7 is cooled by liquid nitrogen in a liquid nitrogen storage tank 9, a part of impurity gas is absorbed in the absorber 7, helium containing a small amount of impurity gas at an outlet of the absorber 7 enters a temperature reduction channel of a solidification heat exchanger 3, the helium is cooled to a temperature below 38K at an outlet of the temperature reduction channel of the solidification heat exchanger 3, most of impurity components are condensed in the solidification heat exchanger 3 and solidified on the inner surface of the solidification heat exchanger 3, the helium at the moment is high-purity helium, the high-purity helium passes through a cold head heat exchanger 2, the cold head heat exchanger 2 is provided with cold energy by a cold head 6 of a refrigerating machine (the low-temperature refrigerating machine 4 is provided with only one cold head), the high-purity helium enters a temperature rise channel of the solidification heat exchanger 3 The mixed gas flowing from the cooling channel of the heat exchanger 1 exchanges heat, and high-purity helium is obtained at the product gas outlet pipe 11. When the helium gas is cooled to below 30K at the outlet of the cooling channel of the solidification heat exchanger 3, ultra-high-purity helium gas is available at the product gas outlet pipe 11.
EXAMPLE III
As shown in fig. 3: the utility model discloses a rare gas purification device based on low temperature cold source is during preparation high-purity neon, and adsorber 7 adopts the low temperature gas cooling in the pipeline, and adsorber 7 sets up after solidification heat exchanger 3. The working process comprises the following steps: the working process is as follows: after entering the purification device from the mixed gas inlet pipe 10, the raw gas is firstly precooled through a cooling channel of the regenerative heat exchanger 1, and then enters a cooling channel inlet of the solidification heat exchanger 3 after being precooled to a lower temperature, the temperature of the cooling channel outlet of the solidification heat exchanger 3 is controlled to be higher than the liquefaction temperature under the partial pressure of neon, so as to prevent liquid neon from being generated, a part of impurity gas (such as nitrogen, oxygen, argon, krypton and the like) is solidified on the inner surface of the solidification heat exchanger 3, the gas coming out of the cooling channel of the solidification heat exchanger 3 enters a low-temperature adsorber 7, most of the rest impurity gas is adsorbed in the adsorber 7, the outlet of the adsorber 7 obtains high-purity neon, the high-purity neon enters the cold head heat exchanger 2 for further cooling, and then the cold energy is recycled through the heating channel of the solidification heat exchanger 3 and the heating channel of the regenerative heat exchanger 1, and.
The first embodiment, the second embodiment and the third embodiment of the present invention only list the principle and method for obtaining high purity helium gas, ultra-high purity helium gas and high purity neon gas, and if more product gases are needed, the three product gases need to be obtained.
The above embodiments are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical scheme according to the technical idea provided by the present invention all fall within the protection scope of the present invention; the technology not related to the utility model can be realized by the prior art.
Claims (9)
1. The utility model provides a rare gas purification device based on low temperature cold source which characterized in that: the device comprises a vacuum cover (8) and a low-temperature refrigerator (4) which is arranged on the vacuum cover (8) and a refrigerator cold head (6) extends into the vacuum cover (8), wherein a regenerative heat exchanger (1), a solidification heat exchanger (3), a cold head heat exchanger (2) and an adsorber (7) are arranged in the vacuum cover (8), and the regenerative heat exchanger (1) is respectively communicated with a mixed gas inlet pipe (10) and a product gas outlet pipe (11) which extend out of the vacuum cover (8); along the gas input direction, the regenerative heat exchanger (1) is sequentially connected with the solidification heat exchanger (3) and the cold head heat exchanger (2) through input pipelines; along the gas backflow direction, the cold head heat exchanger (2) is sequentially connected with the curing heat exchanger (3) and the regenerative heat exchanger (1) through backflow pipelines; the absorber (7) is arranged on an input pipeline from the regenerative heat exchanger (1) to the solidification heat exchanger (3) or an input pipeline from the solidification heat exchanger (3) to the cold head heat exchanger (2); the cold head heat exchanger (2) is connected with the refrigerator cold head (6) for heat exchange.
2. The rare gas purification device based on low temperature cold source as claimed in claim 1, wherein: when the low-temperature refrigerator (4) is a double-stage refrigerator, the primary cold head (5) of the low-temperature refrigerator (4) is connected with the absorber (7), so that the absorber (7) can utilize the cold energy of the primary cold head (5), and the absorber (7) is positioned on an input pipeline from the regenerative heat exchanger (1) to the solidification heat exchanger (3).
3. Rare gas purification device based on low temperature cold source as claimed in claim 2, characterized in that: the primary cold head (5) is connected with the absorber (7) through a high-heat-conductivity material.
4. Rare gas purification device based on low temperature cold source as claimed in claim 2 or 3, characterized in that: the secondary cold head of the low-temperature refrigerator (4) is a refrigerator cold head (6), and the cold head heat exchanger (2) is connected with the refrigerator cold head (6) so as to utilize the cold quantity of the refrigerator cold head (6).
5. The rare gas purification device based on low temperature cold source as claimed in claim 1, wherein: when the low-temperature refrigerator (4) is a primary refrigerator, the absorber (7) is arranged on an input pipeline from the solidification heat exchanger (3) to the cold head heat exchanger (2), and the cold head heat exchanger (2) is connected with the refrigerator cold head (6) to utilize the cold quantity of the refrigerator cold head (6).
6. The rare gas purification device based on low temperature cold source as claimed in claim 1, wherein: when the low-temperature refrigerator (4) is a primary refrigerator and the regenerative heat exchanger (1) is connected to the input pipeline of the solidification heat exchanger (3), the absorber (7) is located in the liquid nitrogen storage tank (9), and the cold head heat exchanger (2) is connected with the refrigerator cold head (6) to utilize the cold quantity of the refrigerator cold head (6).
7. The rare gas purification device based on low temperature cold source as claimed in claim 1, wherein: the adsorption material filled in the adsorber (7) adopts activated carbon or molecular sieve.
8. The rare gas purification device based on low temperature cold source as claimed in claim 1, wherein: the cold head heat exchanger (2) is made of a material with high heat conductivity.
9. Rare gas purification device based on low temperature cold source as claimed in claim 1 or 8, characterized in that: the cold head heat exchanger (2) is in the form of a slit type heat exchanger, a plate type heat exchanger or a wound tube type heat exchanger.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020546118.5U CN212283440U (en) | 2020-04-14 | 2020-04-14 | Rare gas purification device based on low-temperature cold source |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020546118.5U CN212283440U (en) | 2020-04-14 | 2020-04-14 | Rare gas purification device based on low-temperature cold source |
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| CN212283440U true CN212283440U (en) | 2021-01-05 |
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