CN209894794U - Enrichment and purification equipment for single gas in mixed gas - Google Patents
Enrichment and purification equipment for single gas in mixed gas Download PDFInfo
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- CN209894794U CN209894794U CN201920654477.XU CN201920654477U CN209894794U CN 209894794 U CN209894794 U CN 209894794U CN 201920654477 U CN201920654477 U CN 201920654477U CN 209894794 U CN209894794 U CN 209894794U
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Abstract
The utility model provides an enrichment and purification device for single gas in mixed gas, which comprises a pre-purification cold trap which can freeze and adsorb part of target external gas in the mixed gas and is provided with a mixed gas inlet for the mixed gas to enter; the enrichment cold-hot trap is detachably filled with molecular sieves with different specifications, and the gas inlet of the enrichment cold-hot trap is connected with the gas outlet of the pre-purification cold trap through a first switch valve; a freezing device for reducing the temperature of the enriched hot and cold traps; the vacuum obtaining system is used for enabling the enrichment and purification equipment to reach a preset vacuum degree and discharging other target external gases which are not adsorbed in the mixed gas out of the enrichment cold-hot trap, and an air pumping port of the vacuum obtaining system is connected with an air outlet of the enrichment cold-hot trap; the heating device is used for heating the enrichment cold-hot trap so as to completely release the target gas adsorbed by the enrichment cold-hot trap; and the purification output port is connected with the gas outlet of the enrichment cold-hot trap through a second switch valve. Realizes the extraction and purification of single gas in the mixed gas with different molecular weights.
Description
Technical Field
The utility model relates to a gas analysis instrument technical field, more specifically say, relate to an enrichment purification equipment of single gas in mist.
Background
The extraction and purification of a certain gas in mixed gas with different molecular weights are a very important analytical means and pretreatment means in the analysis of analytical chemistry, geochemistry and environmental science.
In the geoscience research, the analysis of the volatile matters in the mineral inclusion has important scientific significance, but in the traditional analysis, after the minerals are crushed under the vacuum condition, gases with different molecular weights in the volatile matters generally comprise gaseous H2O、CO2、SO2、NH3、N2、O2And inert gases and the like are difficult to distinguish.
In addition, for the extraction and purification of the gas with specific molecular weight in the mixed gas, the preparation of the cooling liquid for freezing is generally completed manually, the time and the labor are consumed, the freezing temperature of the cooling liquid is difficult to accurately control, and the analysis precision is influenced.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides an enrichment and purification apparatus for single gas in mixed gas, so as to realize the extraction and purification of single gas in mixed gas with different molecular weights.
In order to achieve the above object, the utility model provides a following technical scheme:
an enrichment and purification device for single gas in mixed gas, comprising:
the pre-purification cold trap can freeze and adsorb part of target external gas in the mixed gas, and is provided with a mixed gas inlet for the mixed gas to enter;
the enrichment cold-hot trap can adsorb target gas in the mixed gas during freezing and release the adsorbed purified target gas during heating, molecular sieves with different specifications are detachably filled in the enrichment cold-hot trap, and a gas inlet of the enrichment cold-hot trap is connected with a gas outlet of the pre-purification cold trap through a first switch valve;
a freezing device for reducing the temperature of the enrichment cold and hot trap to make the enrichment cold and hot trap adsorb the target gas;
the vacuum obtaining system is used for enabling the enrichment and purification equipment to reach a preset vacuum degree and discharging other target foreign gases which are not adsorbed in the mixed gas out of the enrichment cold-hot trap, and an air pumping port of the vacuum obtaining system is connected with an air outlet of the enrichment cold-hot trap;
heating means for heating the enrichment cold-hot trap to completely release the target gas adsorbed by the enrichment cold-hot trap;
and the purification output port is connected with the gas outlet of the enrichment cold-hot trap through a second switch valve.
Preferably, in the above enrichment and purification apparatus, the freezing device comprises:
the freezing sleeve is sleeved outside the enrichment cold-hot trap;
the self-adaptive pressure liquid nitrogen tank is used for storing liquid nitrogen, the self-adaptive pressure liquid nitrogen tank introduces the liquid nitrogen required for freezing the target gas into the freezing sleeve through a guide pipe, and the guide pipe extends below the liquid level of the liquid nitrogen of the self-adaptive pressure liquid nitrogen tank;
a heating module for vaporizing the liquid nitrogen in the autoclavable liquid nitrogen tank to generate pressure to introduce the liquid nitrogen into the freezing sleeve.
Preferably, in the above enrichment and purification apparatus, the freezing device further comprises:
the device comprises a guide pipe, a freezing sleeve, a heating module and a conical guide structure, wherein the conical guide structure is arranged at one end, extending into the self-adaptive pressure liquid nitrogen tank, of the guide pipe, the conical guide structure is gradually expanded from one end, close to the freezing sleeve, to one end, far away from the freezing sleeve, and the heating module is arranged in the conical guide structure.
Preferably, in the above enrichment and purification apparatus, the freezing casing is a teflon casing, the conduit is a teflon tube, and the tapered guide structure is a metal tapered tube.
Preferably, the enrichment and purification apparatus further comprises:
the first temperature control probe is used for detecting the freezing temperature of the enrichment cold-hot trap;
and the freezing temperature control instrument is used for controlling the amount of liquid nitrogen entering the freezing sleeve and is connected with the first temperature control probe and the heating module.
Preferably, in the enrichment and purification equipment, the enrichment cold-hot trap is a stainless steel cold-hot trap, and the heating device is a heating wire arranged on the stainless steel cold-hot trap.
Preferably, the enrichment and purification apparatus further comprises:
the second temperature control probe is used for detecting the heating temperature of the enrichment cold-hot trap;
and the heating temperature control instrument is used for controlling the heating temperature of the heating wire and is connected with the second temperature control probe and the heating wire.
Preferably, in the above enrichment and purification apparatus, the vacuum obtaining system comprises:
the pumping port of the molecular turbo pump is connected with the gas outlet of the enrichment cold-hot trap;
the pumping port of the mechanical pump is connected with the exhaust port of the molecular turbo pump;
a vacuum gauge for measuring the vacuum degree of the enrichment and purification equipment.
Preferably, in the above enrichment and purification apparatus, the enrichment cold and hot trap is in the shape of a spiral pipe with a spiral axis.
Preferably, in the enrichment and purification equipment, the pre-purification cold trap is a U-shaped tube with a U-shaped axis.
According to the above technical solution, the utility model provides an enrichment purification equipment of single gas in the mixed gas includes: the pre-purification cold trap can freeze and adsorb part of target external gas in the mixed gas, and is provided with a mixed gas inlet for the mixed gas to enter; the enrichment cold-hot trap can adsorb target gas in mixed gas during freezing and release the adsorbed purified target gas during heating, molecular sieves with different specifications are detachably filled in the enrichment cold-hot trap, and a gas inlet of the enrichment cold-hot trap is connected with a gas outlet of the pre-purification cold trap through a first switch valve; the refrigerating device is used for reducing the temperature of the enrichment cold-hot trap so that the enrichment cold-hot trap adsorbs the target gas; the vacuum obtaining system is used for enabling the enrichment purification equipment to reach a preset vacuum degree and discharging other target foreign gases which are not adsorbed in the mixed gas out of the enrichment cold-hot trap, and an extraction opening of the vacuum obtaining system is connected with a gas outlet of the enrichment cold-hot trap; the heating device is used for heating the enrichment cold-hot trap so as to completely release the target gas adsorbed by the enrichment cold-hot trap; and the purification output port is connected with the gas outlet of the enrichment cold-hot trap through a second switch valve.
When the device is applied, firstly, the vacuum obtaining system is utilized to enable the enrichment and purification equipment to reach a preset vacuum degree, then, the first switch valve is opened, and the second switch valve is closed; then the mixed gas enters a mixed gas inlet of a pre-purification cold trap, and the pre-purification cold trap is utilized to freeze and adsorb part of target external gas in the mixed gas; then the rest gas enters an enrichment cold-hot trap, the temperature of the enrichment cold-hot trap is reduced by using a refrigerating device, and the enrichment cold-hot trap is selected to adsorb the target gas according to the molecular weight or the freezing point of the target gas to be purified, or molecular sieves with different specifications in the enrichment cold-hot trap are used to adsorb the target gas; after the target gas is completely adsorbed, discharging other target external gas which is not adsorbed in the mixed gas out of the enrichment cold-hot trap by using a vacuum obtaining system; and finally, closing the first switch valve, opening the second switch valve, and heating the enrichment cold-hot trap by using a heating device to completely release the target gas adsorbed by the enrichment cold-hot trap, so that the purified target gas is obtained at a purification output port and then the next analysis link can be carried out.
To sum up, the utility model provides an enrichment purification equipment of single gas in the mist has realized extracting and purifying to single gas in the mist of different molecular weight.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an enrichment and purification apparatus for a single gas in a mixed gas provided by an embodiment of the present invention.
Detailed Description
The embodiment of the utility model provides an enrichment purification equipment of single gas in mist to the extraction and the purification of single gas in the mist of realization to different molecular weight.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.
Referring to fig. 1, an enrichment and purification apparatus for a single gas in a mixed gas provided by an embodiment of the present invention includes: the pre-purification cold trap 10 can freeze and adsorb part of target external gas in the mixed gas, and the pre-purification cold trap 10 is provided with a mixed gas inlet for the mixed gas to enter; the enrichment cold-hot trap 1 can adsorb target gas in mixed gas during freezing and release the adsorbed purified target gas during heating, molecular sieves with different specifications are detachably filled in the enrichment cold-hot trap 1, and a gas inlet of the enrichment cold-hot trap 1 is connected with a gas outlet of the pre-purification cold trap 10 through a first switch valve; a freezing device for reducing the temperature of the enrichment cold-hot trap 1 so that the enrichment cold-hot trap 1 adsorbs the target gas; the vacuum obtaining system is used for enabling the enrichment and purification equipment to reach a preset vacuum degree and discharging other target external gases which are not adsorbed in the mixed gas out of the enrichment cold-hot trap 1, and an air pumping port of the vacuum obtaining system is connected with an air outlet of the enrichment cold-hot trap 1; heating means for heating the enrichment cold-hot trap 1 to completely release the target gas adsorbed by the enrichment cold-hot trap 1; and a purification output port connected with the air outlet of the enrichment cold-hot trap 1 through a second switch valve.
The enrichment cold-hot trap 1 is used for freezing and enriching target gas required to be analyzed.
The vacuum obtaining system is used for obtaining the required vacuum degree in the system, and keeping the vacuum of the pipeline, the pre-purification cold trap 10 and the enrichment cold-hot trap 1.
Specifically, the pre-purification cold trap 10 realizes freezing and adsorption of part of target external gas in the mixed gas by sleeving a liquid nitrogen cup; of course, the liquid nitrogen cup can be replaced by other freezing devices such as a carbon dioxide liquid cooling device and the like according to different requirements for adsorbing the target external gas.
When the device is applied, firstly, the vacuum obtaining system is utilized to enable the enrichment and purification equipment to reach a preset vacuum degree, then, the first switch valve is opened, and the second switch valve is closed; then the mixed gas enters a mixed gas inlet of the pre-purification cold trap 10, and the pre-purification cold trap 10 is utilized to freeze and adsorb part of the target external gas in the mixed gas; then the rest gas enters an enrichment cold-hot trap 1, the temperature of the enrichment cold-hot trap 1 is reduced by using a refrigerating device, and the enrichment cold-hot trap 1 is selected to adsorb the target gas according to the molecular weight or the freezing point of the target gas to be purified, or molecular sieves with different specifications in the enrichment cold-hot trap 1 are used to adsorb the target gas; after the target gas is completely adsorbed, discharging other target foreign gases which are not adsorbed in the mixed gas out of the enrichment cold-hot trap 1 by using a vacuum obtaining system; and finally, closing the first switch valve, opening the second switch valve, and heating the enrichment cold-hot trap 1 by using a heating device to completely release the target gas adsorbed by the enrichment cold-hot trap 1, so that the purified target gas is obtained at a purification output port and then the next analysis link can be performed.
In summary, the enrichment and purification apparatus for single gas in mixed gas provided by this embodiment realizes extraction and purification of single gas in mixed gas with different molecular weights, and the gas that can be directly frozen for enrichment and purification includes H2O、CO2、SO2、NH3、N2And O2Etc. for O2And N2The freeze enrichment and purification can be performed by loading 10A and 5A molecular sieves into the enrichment cold-hot trap 1, respectively.
Preferably, the freezing device comprises a freezing sleeve 2 which is sleeved on the enrichment cold-hot trap 1; a self-adaptive pressure liquid nitrogen tank 3 storing liquid nitrogen, wherein the self-adaptive pressure liquid nitrogen tank 3 introduces liquid nitrogen required by freezing target gas into the freezing sleeve 2 through a guide pipe, and the guide pipe extends below the liquid level of the liquid nitrogen of the self-adaptive pressure liquid nitrogen tank 3; a heating module 4 for vaporizing liquid nitrogen in a self-contained pressure liquid nitrogen tank 3 to generate pressure to introduce the liquid nitrogen into the freezing casing 2.
Specifically, the inner diameter of the freezing sleeve 2 is about 2mm larger than the outer diameter of the enrichment cold-hot trap 1, and the enrichment cold-hot trap 1 is cooled to a low temperature required for freezing the target gas by using liquid nitrogen in the freezing sleeve 2. The self-pressure-adaptive liquid nitrogen tank 3 is in a semi-sealed state, and outputs liquid nitrogen to the freezing casing 2 only through a guide pipe.
In the embodiment, liquid nitrogen in the self-adaptive pressure liquid nitrogen tank 3 is gasified by the heating module 4 to generate pressure, and the liquid nitrogen is automatically introduced into the freezing sleeve 2 through the guide pipe, so that the freezing sleeve 2 is utilized to cool the enrichment cold-hot trap 1, and the enrichment cold-hot trap 1 reaches the freezing temperature of the target gas; the liquid nitrogen entering the freezing casing 2 can be adjusted according to different target gases, so that the freezing temperature of the enrichment cold-hot trap 1 can be conveniently controlled.
It can be understood that the freezing device can also be a liquid nitrogen barrel, and the same effect of adjusting the freezing temperature of the enrichment cold-hot trap 1 can be achieved by controlling the amount of liquid nitrogen in the liquid nitrogen barrel. Of course, the liquid nitrogen can be replaced by other cold liquid, such as a mixed liquid of liquid nitrogen and absolute alcohol, or carbon dioxide cold liquid, and the like.
In a further technical scheme, the freezing device further comprises a conical guide structure arranged at one end, extending into the self-adaptive pressure liquid nitrogen tank 3, of the guide pipe, the conical guide structure gradually expands from one end close to the freezing sleeve 2 to one end far away from the freezing sleeve 2, and the heating module 4 is arranged in the conical guide structure. The conical guide structure is used for gathering pressure generated by the heating module 4 for heating the liquid nitrogen, and pushing the liquid nitrogen into the freezing sleeve 2 so as to be convenient for outputting the liquid nitrogen. Of course, the present application may also replace the tapered guide structure with a structure having an opening larger than the conduit through-hole.
In order to prolong the service life, the freezing sleeve 2 is a polytetrafluoroethylene sleeve, the guide pipe is a polytetrafluoroethylene pipe, and the conical guide structure is a metal conical pipe 5. Of course, the above components may be replaced by other suitable materials.
Preferably, the enrichment and purification equipment further comprises a first temperature control probe for detecting the freezing temperature of the enrichment cold-hot trap 1; and the freezing temperature control instrument 7 is used for controlling the amount of liquid nitrogen entering the freezing sleeve 2, and the freezing temperature control instrument 7 is connected with the first temperature control probe and the heating module 4. The method comprises the following steps that a first temperature control probe is placed at an enrichment cold-hot well 1, the amount of liquid nitrogen entering a freezing sleeve 2 is automatically controlled through a freezing temperature controller 7, when the freezing temperature of the enrichment cold-hot well 1 detected by the first temperature control probe is higher than the freezing temperature of a preset target gas, the freezing temperature controller 7 controls a heating device to be heated, and when the freezing temperature of the enrichment cold-hot well 1 detected by the first temperature control probe is lower than the freezing temperature of the preset target gas, the freezing temperature controller 7 controls the heating device to be cooled; time and labor are saved, the freezing temperature of the refrigerant liquid is convenient to accurately control, and the analysis precision is improved. The utility model discloses can also artificially control the heating temperature of heating module 4.
In order to further simplify the structure, the enrichment cold-hot trap 1 is a stainless steel cold-hot trap, and the heating device is a heating wire arranged on the stainless steel cold-hot trap. This application is through the heater strip directly to the heating of stainless steel cold and hot trap to release absorbent target gas, the structure is fairly simple. Of course, other mediums can be used for the above-mentioned enrichment cold-hot trap 1. The heating device can also be in other structures, such as a heater and the like.
The enrichment and purification equipment also comprises a second temperature control probe for detecting the heating temperature of the enrichment cold-hot well 1; and the heating temperature controller 6 is used for controlling the heating temperature of the heating wire, and the heating temperature controller 6 is connected with the second temperature control probe and the heating wire. The second accuse temperature probe is placed in enrichment cold and hot trap 1 department, this application is through the heating temperature of the cold and hot trap 1 of the automatic control enrichment of heating accuse temperature appearance 6, when the heating temperature of the cold and hot trap 1 of enrichment that the second accuse temperature probe detected is less than the gaseous release temperature of preset target, the heating is controlled the warming up of the warm silk of heating accuse temperature appearance 6 control, when the heating temperature of the cold and hot trap 1 of enrichment that the second accuse temperature probe detected is higher than the gaseous release temperature of preset target, the heating is controlled the warming up of warm appearance 6 control heater silk stop, be convenient for the accurate control enrichment cold and hot trap 1 heating temperature. The utility model discloses can also artificially control the heating temperature of heater strip.
The vacuum obtaining system comprises a molecular turbopump 8, and an air pumping port of the molecular turbopump 8 is connected with an air outlet of the enrichment cold-hot trap 1; the pumping port of the mechanical pump is connected with the exhaust port of the molecular turbo pump 8; a vacuum gauge 9 for measuring the vacuum degree of the enrichment and purification apparatus. The vacuum obtaining system has a simpler structure, and can be replaced by other structures capable of vacuumizing, and the vacuum obtaining system is not an example.
In order to ensure the adsorption effect of the enrichment cold-hot trap 1, the enrichment cold-hot trap 1 is in a spiral pipe shape with the axis in a spiral line. The adsorption capacity of the enrichment cold-hot trap 1 is large, and the purification effect is ensured. Of course, the hot and cold trap 1 may have other shapes, such as a serpentine tube shape.
Preferably, the prepurification cold trap 10 is a U-shaped tube with a U-shaped axis, but may be other shapes, such as a serpentine tube.
For purifying a specific gas from a mixed gas, two main cases can be distinguished:
in the first case, a gas in which the molecular weight is light or the freezing point is relatively low is extracted from the mixed gas; for example: from containing H2O、CO2、N2And O2Extracting and purifying N from the mixed gas2And O2. Firstly, a vacuum obtaining system comprising a mechanical pump and a molecular turbopump 8 is utilized to enable the pipeline of the enrichment and purification equipment to reach the required vacuum degree, and a vacuum gauge 9 is utilized to determine the vacuum degree;
introducing the mixed gas into an enrichment and purification equipment pipeline, sleeving a liquid nitrogen cup outside the pre-purification cold trap 10, and allowing the mixed gas to pass through the pre-purification cold trap 10 firstly due to H2O and CO2The freezing points of the sum are 0 ℃ and-78.5 ℃ respectively, and the temperature of the liquid nitrogen is-195.8 ℃ respectively, wherein H is2O andCO2etc. will be frozen, whether freezing is complete or not can be determined by the vacuum gauge 9, and N2And O2The freezing points of the adsorbent are-209.8 ℃ and-218 ℃ respectively, so that the adsorbent cannot be adsorbed;
purified N2And O2The mixed gas enters a stainless steel cold and hot trap, and the freezing temperature is set to be the nitrogen liquefaction temperature by using a freezing temperature controller 7, and for N2And O2The adsorption of (2) requires filling a molecular sieve in a stainless steel cold-hot trap to adsorb O2The molecular sieve needs to be filled with 10A to adsorb N2The 5A molecular sieve needs to be filled. N after adsorption2Or O2Purification is carried out by means of a molecular turbo pump 8, and the purification process can be detected by means of a vacuum gauge 9. Purified N2Or O2And then, a heating temperature controller 6 is used for setting the heating temperature to be 120 ℃, so that the target gas adsorbed in the molecular sieve can be completely desorbed, and the gas release degree is detected by using a vacuum gauge 9. Thus extracting and purifying N from the mixed gas2Or O2The next analysis stage can be entered.
In the second case, a gas having a relatively heavy molecular weight or a relatively high freezing point is extracted and purified from the mixed gas. Taking the above mixed gas as an example, purified H is extracted from the mixed gas2O or CO2. Firstly, a vacuum obtaining system comprising a mechanical pump and a molecular turbopump 8 is utilized to enable the pipeline of the enrichment and purification equipment to reach the required vacuum degree, and a vacuum gauge 9 is utilized to determine the vacuum degree;
when extracting and purifying CO2When in use, the mixed gas is introduced into the pipeline of the enrichment and purification equipment due to H2O and CO2The freezing points of the pre-purification cold trap 10 are respectively 0 ℃ and-78.5 ℃, and the pre-purification cold trap is controlled to be positioned at H2O and CO2Freezing point temperature of H in the solution2O is frozen, and whether the freezing is completely determined by the vacuum gauge 9; then the remaining mixed gas enters a stainless steel cold and hot trap, and the temperature of the stainless steel cold and hot trap is lower than that of CO2Adsorption temperature of, CO2Is set to-90 deg.C, thereby introducing CO2Adsorbing in a stainless steel cold-hot trap;
when extracting and purifying H2And when O is needed, introducing the mixed gas into an enrichment and purification equipment pipeline, keeping the pre-purification cold trap 10 at normal temperature, and performing extraction and purification processes in a stainless steel cold-hot trap. Setting H by using freezing temperature controller 72Adsorption temperature of O is lower than that of H2Freezing point of O, wherein H2The adsorption temperature of O was set to-15 ℃ to ensure that only H was adsorbed2O；
After the two gases are purified, the vacuum gauge 9 is used for determining the adsorption completion condition, and after the adsorption is completed, other gases in the pipeline are pumped away by using the molecular turbopump 8 to achieve the purpose of purifying the target gas. The purification process was checked by means of a vacuum gauge 9. When the gas purification is completed, the heating temperature is set to 120 ℃ by using the heating temperature control instrument 6, the target gas adsorbed in the stainless steel cold-hot trap can be completely desorbed, and the degree of gas release is detected by using the vacuum gauge 9. H thus extracted and purified from the mixed gas2O or CO2The next analysis stage can be entered.
The utility model provides an enrichment purification equipment of single gas has following advantage in the mist:
1. the application range is wide. No matter simple mixed gas or complex mixed gas with different molecular weights, the utility model discloses all can effectively enrich and purify the gas of a certain specific molecular weight among them.
2. The analysis precision is high. Due to the adoption of the high-vacuum pipeline design of the molecular turbopump 8, the internal volume of a system pipeline is small, and compared with the traditional method, the analysis precision can be improved by one order of magnitude.
3. The analysis process is efficient and simple. The integrated module design is adopted, and meanwhile, the system freezing and desorption are automatically controlled, so that the analysis efficiency is greatly improved compared with the traditional method.
The utility model discloses will provide high-efficient feasible instrument analysis platform for earth science, environmental science's research.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An enrichment and purification device for a single gas in a mixed gas, which is characterized by comprising:
the pre-purification cold trap (10) can freeze and adsorb part of target external gas in the mixed gas, and the pre-purification cold trap (10) is provided with a mixed gas inlet for the mixed gas to enter;
the cold and hot enrichment trap (1) can adsorb target gas in the mixed gas during freezing and release the adsorbed and purified target gas during heating, molecular sieves with different specifications are detachably filled in the cold and hot enrichment trap (1), and a gas inlet of the cold and hot enrichment trap (1) is connected with a gas outlet of the pre-purification cold trap (10) through a first switch valve;
a freezing device for reducing the temperature of the enrichment cold-hot trap (1) so that the enrichment cold-hot trap (1) adsorbs the target gas;
the vacuum obtaining system is used for enabling the enrichment and purification equipment to reach a preset vacuum degree and discharging other target foreign gases which are not adsorbed in the mixed gas out of the enrichment cold-hot trap (1), and an air pumping port of the vacuum obtaining system is connected with an air outlet of the enrichment cold-hot trap (1);
heating means for heating the enrichment cold-hot trap (1) to completely release the target gas adsorbed by the enrichment cold-hot trap (1);
and the purification output port is connected with the air outlet of the enrichment cold-hot trap (1) through a second switch valve.
2. The enrichment purification apparatus of claim 1, wherein the freezing device comprises:
a freezing sleeve (2) sleeved outside the enrichment cold-hot trap (1);
the self-adaptive pressure liquid nitrogen tank (3) is used for storing liquid nitrogen, the self-adaptive pressure liquid nitrogen tank (3) introduces the liquid nitrogen required for freezing the target gas into the freezing sleeve (2) through a guide pipe, and the guide pipe extends below the liquid nitrogen liquid level of the self-adaptive pressure liquid nitrogen tank (3);
a heating module (4) for vaporizing the liquid nitrogen in the self-pressure liquid nitrogen tank (3) to generate pressure to introduce the liquid nitrogen into the freezing sleeve (2).
3. The enrichment purification apparatus of claim 2, wherein the freezing device further comprises:
the device comprises a conical guide structure arranged at one end, extending into the self-adaptive pressure liquid nitrogen tank (3), of the guide pipe, the conical guide structure gradually expands from one end close to the freezing sleeve (2) to one end far away from the freezing sleeve (2), and a heating module (4) is arranged in the conical guide structure.
4. An enrichment and purification apparatus according to claim 3, characterized in that the freezing sleeve (2) is a teflon sleeve, the conduit is a teflon tube and the conical guiding structure is a metal conical tube (5).
5. The enrichment purification apparatus of any one of claims 2-4, further comprising:
a first temperature control probe for detecting the freezing temperature of the enrichment cold-hot trap (1);
and the freezing temperature control instrument (7) is used for controlling the amount of liquid nitrogen entering the freezing sleeve (2), and the freezing temperature control instrument (7) is connected with the first temperature control probe and the heating module (4).
6. The enrichment purification apparatus according to claim 1, wherein the enrichment cold-hot trap (1) is a stainless steel cold-hot trap, and the heating device is a heating wire disposed on the stainless steel cold-hot trap.
7. The enrichment purification apparatus of claim 6, further comprising:
the second temperature control probe is used for detecting the heating temperature of the enrichment cold-hot trap (1);
and the heating temperature control instrument (6) is used for controlling the heating temperature of the heating wire, and the heating temperature control instrument (6) is connected with the second temperature control probe and the heating wire.
8. The enrichment purification apparatus of claim 1, wherein the vacuum obtaining system comprises:
the air pumping port of the molecular turbo pump (8) is connected with the air outlet of the enrichment cold-hot trap (1);
the pumping port of the mechanical pump is connected with the exhaust port of the molecular turbo pump (8);
a vacuum gauge (9) for measuring the vacuum degree of the enrichment and purification device.
9. The enrichment purification apparatus according to claim 1, wherein the enrichment cold-hot trap (1) is in the shape of a spiral tube with a spiral axis.
10. The enrichment purification apparatus according to claim 1, wherein the pre-purification cold trap (10) is a U-tube with a U-shaped axis.
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| CN201920654477.XU CN209894794U (en) | 2019-05-08 | 2019-05-08 | Enrichment and purification equipment for single gas in mixed gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110095575A (en) * | 2019-05-08 | 2019-08-06 | 中国科学技术大学 | The enriching and purifying equipment of pure gas in mixed gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110095575A (en) * | 2019-05-08 | 2019-08-06 | 中国科学技术大学 | The enriching and purifying equipment of pure gas in mixed gas |
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