CN215672697U - High-purity fluid medium supercharging device - Google Patents
High-purity fluid medium supercharging device Download PDFInfo
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- CN215672697U CN215672697U CN202121671257.1U CN202121671257U CN215672697U CN 215672697 U CN215672697 U CN 215672697U CN 202121671257 U CN202121671257 U CN 202121671257U CN 215672697 U CN215672697 U CN 215672697U
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Abstract
A high-purity gas supercharging device comprises a refrigerating system, a secondary refrigerant storage tank and a circulating system, a high-purity medium passage and a liquid supercharging pump, wherein after the high-purity gas enters the supercharging device, the high-purity gas is firstly cooled by an output medium and then further cooled by the refrigerating system, so that liquefaction and a certain supercooling degree are ensured, cavitation erosion in the working process of a gear pump is prevented, the supercharged high-purity liquid medium is heated and gasified by an input medium, the pressure in the gasification process is unchanged, and the supercharging of the gas medium is realized. The utility model expands the application range of the liquid booster pump from liquid to gas, and can obtain gas with large flow and high pressure. The utility model has convenient use and long service life and is suitable for the pressurization occasions of high-purity gas.
Description
Technical Field
The utility model relates to a high-purity gas medium, in particular to a high-purity fluid medium supercharging device.
Background
In a liquid xenon dark substance detection experiment represented by PandaX, xenon with the purity of more than 99.9995 percent is required, particularly, the content of krypton in the xenon needs to be controlled to 1ppt or even 0.1ppt, air pollution needs to be strictly prevented, and strict sealing requirements are required for the whole pipeline and a storage system. Impurities adsorbed on the surfaces of a photomultiplier tube, a cable, a structural material and the like in the dark substance detector or elements such as C, N, O, H and the like which are micro elements can be released by the impurities, the micro elements have obvious negative effects on the dark substance detector, and continuous cycle purification by xenon is required.
In order to ensure reliability, the pump used for xenon circulation is a diaphragm pump without dynamic seal. However, as the size of the detector is enlarged, the flow rate and pressure required for purifying the xenon gas by circulation are increased sharply, and the diaphragm pump is gradually difficult to meet the requirements. And the diaphragm pump vibrates seriously with the noise during operation, influences laboratory staff's health and efficiency, and the diaphragm that the diaphragm pump used receives alternating stress, and the life-span is limited, needs regularly to change, and the operation of diaphragm pump need be suspended during the change, brings certain negative effects for the continuous operation of dark matter experiment detector.
The shield pump for pressurizing gas by adopting the shield motor to drive the blades has the advantages that the required blade rotating speed is very high, the single-stage blade pressurizing capacity is insufficient, a mature product is not available at present at home, the flow and the pressure of the foreign shield gas pressurizing pump are also insufficient, and the possibility of forbidden transportation is faced. It is necessary to develop a pressurizing device of a high-purity fluid medium based on domestic equipment.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems and optimize the operation stability and reliability of a PandaX dark substance detection experiment system, the utility model provides a high-purity gas pressurizing device which can conveniently pressurize a high-purity gas medium without affecting the purity of the high-purity gas so as to meet other process requirements. Hereinafter, the working principle of the present invention will be described by taking xenon as an example.
The technical solution of the utility model is as follows:
the supercharging device for the high-purity gas is characterized by comprising a refrigerating system, a secondary refrigerant storage tank and circulating system, a high-purity medium passage and a liquid booster pump:
the refrigerating system, the secondary refrigerant storage tank and the circulating system comprise a first thermometer, a second thermometer, a large secondary refrigerant storage tank, a small secondary refrigerant storage tank, a refrigerant return pipeline, an evaporator coil, a throttle valve, a refrigerant input pipeline, a secondary refrigerant circulating pump, a first valve, a second valve and a third valve,
the secondary refrigerant storage tank comprises an upper part and a lower part, namely a secondary refrigerant large storage tank and a secondary refrigerant small storage tank, the secondary refrigerant large storage tank is communicated with the secondary refrigerant small storage tank and is respectively provided with a second thermometer and a first thermometer, the secondary refrigerant small storage tank is internally provided with the evaporator coil, and the refrigerant output by the refrigerant storage tank returns to the refrigerant storage tank through the refrigerant input pipeline, the throttle valve, the evaporator coil and the refrigerant return pipeline in sequence;
the refrigerant is connected with the inlet of the secondary refrigerant large storage tank through the third valve by a pipeline, the output port at the lower end of the secondary refrigerant small storage tank is respectively connected with the first valve and the second valve after passing through the circulating pump by a pipeline, and the output end of the first valve returns to the refrigerant tank through a pipeline;
the high-purity medium passage and the liquid booster pump comprise an air inlet pipe, a first pressure sensor, an air outlet pipe, a second pressure sensor, a heat exchanger, a first connecting pipeline, a second connecting pipeline, a liquefaction coil pipe, a third connecting pipeline and a booster pump, wherein the liquefaction coil pipe is arranged in the secondary refrigerant small storage tank, the air inlet pipe is provided with the first pressure sensor, the air inlet pipe enters the secondary refrigerant small storage tank through the heat exchanger and the first connecting pipeline and is connected with the liquefaction coil pipe, the output end of the liquefaction coil pipe enters the heat exchanger through the third connecting pipeline, the pipeline booster pump and the second connecting pipeline, the output end of the heat exchanger is connected with the air outlet pipe for outputting after heat exchange, and the air outlet pipe is provided with the second pressure sensor.
The liquefaction coil is cooled by the refrigeration system directly or by a coolant.
The booster pump and the circulating pump are gear pumps without dynamic seals.
The refrigerating system comprises a compressor for refrigeration, semiconductor refrigeration or low-temperature medium refrigeration.
The working principle of the utility model is as follows:
after entering the boosting device, the high-purity gas is firstly cooled by the output medium and then further cooled by the refrigerating system, so that liquefaction and a certain supercooling degree are ensured, and cavitation in the working process of the gear pump is prevented. The pressurized high-purity liquid medium is heated and gasified by the input medium, the pressure is unchanged in the gasification process, and the pressurization of the gas medium is realized.
Compared with the prior art, the utility model has the advantages that:
firstly, the problems of violent vibration, strong noise and limited service life of the diaphragm pump are solved;
second, output pressure output flow higher than that of the diaphragm pump can be obtained, and a larger selection space is provided for experimental device purification equipment;
thirdly, the utility model expands the application range of the liquid booster pump from liquid to gas, and can obtain gas with large flow rate and high pressure.
Fourthly, the utility model has convenient use and long service life and is suitable for the pressurization occasions of high-purity gas.
Fifth, the medium that can be pressurized by the apparatus of the present invention is not limited to high purity xenon gas, and high purity gas whose liquefaction point is not too low can be pressurized by the apparatus of the present invention.
Drawings
Fig. 1 is a working schematic diagram of a high-purity fluid medium supercharging device of the utility model.
Detailed Description
The embodiments and methods of use of the present invention are described in detail below with reference to the drawings, but the utility model can be practiced in many different ways as defined and covered by the claims.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating the operation of the high purity fluid medium pressurizing device according to the present invention, and it can be seen that the high purity gas pressurizing device according to the present invention includes a refrigeration system, a coolant storage tank and circulation system, a high purity medium passage, and a liquid pressurizing pump.
The refrigeration system, the secondary refrigerant storage tank and the circulating system comprise a first thermometer 21, a second thermometer 22, a secondary refrigerant large storage tank 23, a secondary refrigerant small storage tank 24, a refrigerant return pipeline 25, an evaporator coil 26, a throttle valve 27, a refrigerant input pipeline 28, a secondary refrigerant circulating pump 29, a first valve 30, a second valve 31 and a third valve 32, wherein the secondary refrigerant storage tank comprises an upper part and a lower part, namely a large secondary refrigerant storage tank 23 and a small secondary refrigerant storage tank 24, the large secondary refrigerant storage tank 23 and the small secondary refrigerant storage tank 24 are communicated and are respectively provided with a second thermometer 22 and a first thermometer 21, the small refrigerating medium storage tank 24 is internally provided with the evaporator coil 26, and the refrigerating medium output from the refrigerating medium storage tank (not shown) returns to the refrigerating medium storage tank through the refrigerating medium input pipeline 28, the throttling valve 27, the evaporator coil 26 and the refrigerating medium return pipeline 25 in sequence;
the refrigerant is connected with the inlet of the large secondary refrigerant storage tank 23 through the third valve 32 by a pipeline, the outlet at the lower end of the small secondary refrigerant storage tank 24 is connected with the first valve 30 and the second valve 31 respectively through pipelines after passing through the circulating pump 29, and the output end of the first valve 30 returns to the refrigerant tank through a pipeline.
The high-purity medium passage and the liquid booster pump comprise an air inlet pipe 1, a first pressure sensor 2, an air outlet pipe 3, a second pressure sensor 4, a heat exchanger 5, a first connecting pipeline 6, a second connecting pipeline 7, a liquefaction coil pipe 8, a third connecting pipeline 9 and a booster pump 10, wherein the liquefaction coil pipe 8 is arranged in the secondary refrigerant small storage tank 24, the air inlet pipe 1 is provided with a first pressure sensor 2, the air inlet pipe 1 enters the small secondary refrigerant storage tank 24 through the heat exchanger 5 and the first connecting pipeline 6 and is connected with the liquefaction coil pipe 8, the output end of the liquefaction coil 8 enters the heat exchanger 5 through the third connecting pipeline 9, the pipeline booster pump 10 and the second connecting pipeline 7, the output end of the heat exchanger 5 is connected with the output end of the air outlet pipe 3 after heat exchange, and the air outlet pipe 3 is provided with a second pressure sensor 4.
The liquefaction coil 8 is cooled by the refrigeration system either directly or by means of a coolant. The booster pump 10 and the circulating pump 29 are gear pumps without dynamic seals. The refrigerating system comprises a compressor for refrigeration, semiconductor refrigeration or low-temperature medium refrigeration.
Examples
In the embodiment, the high-purity gas is high-purity xenon, the triple point temperature of the xenon is-111.74 ℃, the triple point pressure is 0.0816MPa, and the xenon can be directly changed into solid xenon below the triple point temperature, so that the flowing capacity is lost. Actually, the freezing point of xenon is not greatly influenced by the gas pressure, and the melting point change is not more than 0.1 ℃ in the range of 0.08MPa to 0.5MPa, so the temperature of the ethanol refrigerant is controlled to be not lower than-110 ℃, and the generation of solid xenon can be avoided.
Because the absolute pressure of the PandaX dark matter detector is designed to be 0-0.35 MPa, the absolute pressure is generally 0.1-0.25 MPa in actual operation, and the corresponding xenon boiling point is listed in table 1. It can be seen that reliable liquefaction of xenon can be achieved over a wide range of pressures.
TABLE 1 xenon boiling points at different pressures
The embodiment adopts the compressor type low-temperature refrigerating system to provide a cold source for liquefying xenon, and adopts the heat exchanger to improve the use efficiency of cold energy. The high-purity xenon firstly enters the plate heat exchanger to exchange heat with the pressurized low-temperature liquid xenon, the temperature of the xenon is reduced, even the xenon is liquefied, and meanwhile, an output medium is heated, so that the cold energy of the liquid xenon is fully utilized, and the output xenon is ensured to be in a gaseous state. If other high-purity gases need to be pressurized, the rated working temperature of the refrigerating system can be determined according to conditions such as a phase diagram of actual gases, input pressure and the like, or the refrigerating system adopting other principles can be adopted.
The low-temperature refrigeration system adopts an ethanol secondary refrigerant, the secondary refrigerant storage tank is divided into an upper part and a lower part, the diameter of the upper storage tank is large, the volume of the upper storage tank is large, and more ethanol can be contained in the upper storage tank; the lower storage tank has a small diameter, contains less ethanol and can quickly reach the expected temperature after the low-temperature refrigeration system is started. The lower storage tank is internally provided with a refrigerating system evaporator coil, a xenon liquefaction coil and a sensor for measuring the temperature of secondary refrigerant, the evaporator coil cools the xenon liquefaction coil through ethanol to liquefy xenon in the coil, and the ethanol is used as a heat conducting medium and a heat capacity medium to avoid severe temperature change outside the xenon coil so as to adapt to the working conditions that a compressor cannot be frequently started and stopped and the pressure of an inlet of xenon is unstable. When the cold output by the evaporator is longer than the cold required by the liquefaction of xenon for a long time, the refrigerating medium circulating pump can be started, and the redundant cold is used for cooling the refrigerating medium in the large storage tank. The xenon coil has a large length and diameter and serves as a storage buffer container for liquid xenon.
When liquid xenon appears in the xenon coil pipe, the liquid booster pump can be started, the liquid xenon after being boosted exchanges heat with the normal-temperature gaseous xenon before being liquefied and then is gasified, at the moment, the gaseous xenon still can maintain higher pressure, and the xenon can be introduced into equipment such as a gas purifier and the like for purification.
Pretreatment before use: in the device, the part for high-purity xenon to enter comprises an air inlet pipe 1, an air outlet pipe 3, a plate heat exchanger 5, a connecting pipeline 6, a connecting pipeline 7, a cooling coil 8, a connecting pipeline 9 and a gear pump 10. In order to avoid air pollution of high-purity xenon, the high-purity xenon is required to be vacuumized to 1E-4Pa in advance. Considering the influence of temperature, the refrigerating system is started after the vacuumizing is finished.
Starting and initial operation conditions:
after the supercharging device is connected to the pipeline of the system, the gas inlet pipe 1, the gas outlet pipe 3, the plate heat exchanger 5, the connecting pipe 6, the connecting pipe 7, the cooling coil 8, the connecting pipe 9 and the gear pump 10 are all xenon and have equal pressure, and the real-time pressure of the gas inlet pipe 1 and the real-time pressure of the gas outlet pipe 2 can be obtained from the first pressure sensor 2 and the second pressure sensor 4 respectively. At this time, the refrigeration system is started, the refrigerant enters the pipeline 28 and is throttled by the throttle valve 27, the gasified low-temperature refrigerant enters the evaporator coil 26 to cool the ethanol in the secondary refrigerant small storage tank 24, the temperature of the ethanol is gradually reduced, the temperature of the ethanol can be obtained from the first thermometer 21, and the ethanol is simultaneously used as a heat transfer medium to gradually cool the xenon coil 8. When the temperature of the inner wall of the xenon coil 8 reaches the dew point of xenon, liquid xenon begins to appear and gradually increases, the gravity thereof exceeds the surface tension and flows along the inner wall of the coil to the second connecting pipe 9 at the lower part, and the liquid level thereof is collected therein, if the liquid xenon is more, the liquid level may rise to the inside of the xenon coil 8. The presence of liquid xenon in the second connecting line 9 indicates that the pressurising means is ready.
And (3) supercharging operation working condition:
when the first thermometer 21 shows that the temperature of ethanol in the coolant small storage tank 24 is lower than-105 ℃ and lasts for more than 15 minutes, the booster pump gear pump 10 driven by a servo motor (not shown) is started, the liquid xenon is started at a low speed, the liquid xenon slowly enters the third connecting pipe 7 from the second connecting pipe 9 until enters the heat exchanger 5 to exchange heat with the entering normal-temperature xenon and then is gasified, the pressure of the gasified xenon is not lower than the output pressure of the gear pump 10, and the xenon can realize pressurization. And then gradually increasing the rotation speed of the gear pump 10 for driving the servo motor to increase the flow rate, so that the flow rate and the pressure of the high-purity xenon in the exhaust pipe 3 are increased until the rated working condition is reached. The output peak pressure of the gear pump 10 can reach 2MPa, so that the output pressure of high-purity xenon can also be ensured to be 2 MPa. When the second pressure sensor 4 gives an overpressure alarm, the rotation speed of the drive servo motor of the gear pump 10 can be reduced or even the drive can be stopped.
When the temperature of the ethanol in the coolant small storage tank 24 is cooled to-105 ℃ and continuously drops, the first closed valve 30 and the third valve 32 are closed, the second valve 31 is opened, the circulating pump gear pump 29 is opened, the flow rate of the gear pump 29 is determined according to the temperature of the ethanol in the coolant large storage tank 23 measured by the 2 nd thermometer 22, and the higher the temperature is, the smaller the flow rate is. When the temperatures of the ethanol in the large storage tank 23 and the small storage tank 24 reach minus 110 ℃, the compressor can be temporarily closed to save the electric power, the cold energy stored by the ethanol refrigerating medium is used for liquefying the xenon, and if the temperatures of the refrigerating medium, which are displayed by the first thermometer 21 and the second thermometer 22, rise to minus 103 ℃, are all increased, the compressor (not shown) is started again for refrigerating.
The operation condition of the refrigerator is as follows:
the refrigeration system of the device can independently operate, no high-purity gas is pressurized at the moment, no heat load exists in the refrigeration system, the second valve 31 can be closed, the first valve 30 and the third valve 32 can be opened, the circulating pump 29 is started, and low-temperature ethanol is output outwards.
The medium which can be pressurized by the device of the utility model is not limited to high-purity xenon, and the high-purity gas of which the liquefaction point is not too low can be pressurized by the device of the utility model.
Experiments show that the xenon is cooled and liquefied firstly, is pressurized by the liquid booster pump and then exchanges heat with the input xenon through the heat exchanger, and meanwhile, the refrigeration power requirement on the cooling module is reduced, and the xenon is output after being gasified. Because the density of the liquid xenon is about 500 times of that of the xenon in a standard state, the requirement of a gas booster pump on high rotating speed is avoided, the used liquid booster pump is a gear pump, the single-stage boosting capacity is strong, and the pressure can reach 2MPa or even higher. The gear pump is driven by the magnetic coupling, and no dynamic seal is provided, so that no additional pollution is brought. The key point of the utility model is that the xenon can be liquefied efficiently and reliably under different input working conditions. The utility model overcomes the problems of violent vibration, strong noise and limited service life of the diaphragm pump; the output pressure output flow higher than that of the diaphragm pump can be obtained, and a larger selection space is provided when the purification equipment of the experimental device is selected; the medium which can be pressurized by the device of the utility model is not limited to high-purity xenon, and the high-purity gas of which the liquefaction point is not too low can be pressurized by the device of the utility model.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (4)
1. The high-purity gas supercharging device is characterized by comprising a refrigerating system, a secondary refrigerant storage tank, a circulating system, a high-purity medium passage and a liquid supercharging pump:
the refrigerating system, the secondary refrigerant storage tank and the circulating system comprise a first thermometer (21), a second thermometer (22), a secondary refrigerant large storage tank (23), a secondary refrigerant small storage tank (24), a refrigerant return pipeline (25), an evaporator coil (26), a throttle valve (27), a refrigerant input pipeline (28), a secondary refrigerant circulating pump (29), a first valve (30), a second valve (31) and a third valve (32),
the secondary refrigerant storage tank comprises an upper secondary refrigerant storage tank (23) and a lower secondary refrigerant storage tank (24), the large secondary refrigerant storage tank (23) is communicated with the small secondary refrigerant storage tank (24) and is respectively provided with a second thermometer (22) and a first thermometer (21), the small secondary refrigerant storage tank (24) is internally provided with the evaporator coil (26), and the refrigerant output by the refrigerant storage tank returns to the refrigerant storage tank through the refrigerant input pipeline (28), the throttle valve (27), the evaporator coil (26) and the refrigerant return pipeline (25) in sequence;
the refrigerant is connected with the inlet of the large secondary refrigerant storage tank (23) through the third valve (32) by a pipeline, the outlet at the lower end of the small secondary refrigerant storage tank (24) is connected with the first valve (30) and the second valve (31) respectively after passing through the circulating pump (29) by a pipeline, and the output end of the first valve (30) returns to the refrigerant tank through a pipeline;
the high-purity medium passage and the liquid booster pump comprise an air inlet pipe (1), a first pressure sensor (2), an air outlet pipe (3), a second pressure sensor (4), a heat exchanger (5), a first connecting pipeline (6), a second connecting pipeline (7), a liquefaction coil pipe (8), a third connecting pipeline (9) and a booster pump (10), wherein the liquefaction coil pipe (8) is arranged in the secondary refrigerant small storage tank (24), the air inlet pipe (1) is provided with the first pressure sensor (2), the air inlet pipe (1) enters the secondary refrigerant small storage tank (24) through the heat exchanger (5) and the first connecting pipeline (6) and is connected with the liquefaction coil pipe (8), the output end of the liquefaction coil pipe (8) enters the heat exchanger (5) through the third connecting pipeline (9), the pipeline booster pump (10) and the second connecting pipeline (7), after heat exchange, the output port of the heat exchanger (5) is connected with the output of the air outlet pipe (3), and the air outlet pipe (3) is provided with a second pressure sensor (4).
2. The apparatus for pressurizing high purity gas according to claim 1, wherein said liquefaction coil (8) is cooled by said refrigeration system directly or by means of a coolant.
3. The apparatus for pressurizing high-purity gas according to claim 1, wherein said pressurizing pump (10) is a gear pump without dynamic seal.
4. The apparatus for pressurizing high-purity gas as recited in claim 1, wherein said refrigeration system comprises compressor refrigeration, semiconductor refrigeration, or cryogenic medium refrigeration.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121671257.1U CN215672697U (en) | 2021-07-22 | 2021-07-22 | High-purity fluid medium supercharging device |
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| CN202121671257.1U CN215672697U (en) | 2021-07-22 | 2021-07-22 | High-purity fluid medium supercharging device |
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