CN211528297U - Liquefaction temperature test system for mixed gas - Google Patents
Liquefaction temperature test system for mixed gas Download PDFInfo
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- CN211528297U CN211528297U CN201921713405.4U CN201921713405U CN211528297U CN 211528297 U CN211528297 U CN 211528297U CN 201921713405 U CN201921713405 U CN 201921713405U CN 211528297 U CN211528297 U CN 211528297U
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Abstract
The utility model relates to a mist's liquefaction temperature test system, this liquefaction temperature test system includes: the device comprises a gas supply device, a gas storage device, a gas pressure sensor, a temperature control device and a gas chromatography-mass spectrometer; the gas supply device is connected with the gas storage device, and the inside of the gas supply device is communicated with the inside of the gas storage device; the air pressure sensor is connected with the air supply device and communicated with the inside of the air storage device; the gas chromatography-mass spectrometer is connected with the gas supply device and communicated with the inside of the gas storage device; the gas storage device and the air pressure sensor are both arranged in the temperature control device. The liquefaction temperature test system of the mixed gas is convenient to measure the liquefaction temperature of the mixed gas.
Description
Technical Field
The utility model relates to a gaseous test technical field especially relates to a mist's liquefaction temperature test system.
Background
For the liquefaction temperature of a gas, different gases have different liquefaction temperatures, some have higher liquefaction temperatures, and some have lower liquefaction temperatures. For gases with higher liquefaction temperatures, when used as industrial gases, the balance gas is usually filled to maintain a lower partial pressure, so as to lower the liquefaction temperature and improve the low-temperature stability of the mixed gas.
For example, in the field of insulating gas applications, some novel insulating gases used include C4F7N (perfluoroisobutyronitrile, boiling point at 1 atm. about. -4.7 ℃ C.), C5F10O (perfluoro-n-propyl vinyl ether, liquefaction temperature at 1atm about 26.5 ℃ C.), etc., has a high liquefaction temperature and must be charged with CO2Or N2And so on, to form a mixed gas. Because the novel insulating gas lacks relevant thermophysical parameters and is easy to introduce errors in the calculation process, in order to master the liquefaction temperature of the mixed gas and the composition change condition of the mixed gas under the low-temperature condition and evaluate the low-temperature service performance and the use temperature range of the mixed gas, the liquefaction temperature of the mixed gas needs to be tested and measured.
However, in the conventional measurement of the liquefaction temperature, only a single gas can be measured by measuring the saturated vapor pressure (the partial pressure of the gas in the air, which generally increases with an increase in temperature), and the liquefaction temperature of the mixed gas is difficult to measure.
SUMMERY OF THE UTILITY MODEL
In view of this, it is necessary to provide a system for measuring the liquefaction temperature of a mixed gas, which is directed to the problem that the conventional measurement of the liquefaction temperature can measure only a single gas and the liquefaction temperature of the mixed gas is difficult to measure.
A liquefaction temperature test system of a mixed gas, comprising: the device comprises a gas supply device, a gas storage device, a gas pressure sensor, a temperature control device and a gas chromatography-mass spectrometer;
the gas supply device is connected with the gas storage device, and the inside of the gas supply device is communicated with the inside of the gas storage device;
the air pressure sensor is connected with the air supply device and communicated with the inside of the air storage device;
the gas chromatography-mass spectrometer is connected with the gas supply device and communicated with the inside of the gas storage device;
the gas storage device and the air pressure sensor are both arranged in the temperature control device.
In one embodiment, the liquefaction temperature test system further includes a data acquisition card electrically connected to the barometric pressure sensor, and the data acquisition card is configured to acquire a signal generated by the barometric pressure sensor.
In one embodiment, the liquefaction temperature test system further comprises a mass flow meter, the gas supply device is connected with the gas storage device through the mass flow meter, the inside of the gas supply device, the inside of the mass flow meter and the inside of the gas storage device are sequentially communicated, and the mass flow meter is used for measuring the quality of gas flowing into the gas storage device from the gas supply device.
In one embodiment, the liquefaction temperature test system further comprises a pressure reducing device, the gas supply device is connected with the gas storage device through the pressure reducing device, the inside of the gas supply device, the inside of the pressure reducing device and the inside of the gas supply device are sequentially communicated, and the pressure reducing device is used for reducing the pressure of the gas flowing out from the gas supply device and then flowing into the gas storage device.
In one embodiment, the liquefaction temperature testing system further comprises a constant flow device, the gas supply device is connected with the gas storage device through the constant flow device, the interior of the gas supply device, the interior of the constant flow device and the interior of the gas supply device are sequentially communicated, and the constant flow device is used for decompressing gas flowing out of the gas supply device and then flowing into the gas storage device.
In one embodiment, the liquefaction temperature test system further comprises a vacuum-pumping device, the interior of the vacuum-pumping device is connected with the gas supply device, and the vacuum-pumping device is communicated with the interior of the gas supply device.
In one embodiment, a first ferrule connector is arranged on the gas storage device, and the first ferrule connector is communicated with the inside of the gas storage device;
the air supply device is detachably connected with the first clamping sleeve connector through a first air supply pipeline, and the interior of the first air supply pipeline is communicated with the interior of the air supply device and the interior of the first clamping sleeve connector respectively.
In one embodiment, a second ferrule connector is arranged on the gas storage device, and the second ferrule connector is communicated with the inside of the gas storage device;
the air pressure sensor is detachably connected with the second clamping sleeve connector through a second air supply pipeline, and the interior of the second air supply pipeline is communicated with the air pressure sensor and the interior of the second clamping sleeve connector respectively.
In one embodiment, a third sleeve joint is arranged on the gas storage device, and the third sleeve joint is communicated with the inside of the gas storage device;
the gas chromatography-mass spectrometer is detachably connected with the third clamping sleeve joint through the third gas supply pipeline, and the inside of the third gas supply pipeline is respectively communicated with the gas chromatography-mass spectrometer and the inside of the third clamping sleeve joint.
In one embodiment, an outer surface of the third air supply duct is coated with an insulating layer.
According to the liquefaction temperature testing system for the mixed gas, the gas to be tested with certain pressure is filled into the gas storage device through the gas supply device, the temperature control system is started to control the temperature within the preset range, after the temperature inside the gas storage device in the temperature control system reaches the set temperature, the temperature and the gas pressure data of the mixed gas with different preset temperatures are measured through the gas pressure sensor, the content data of each gas component in the mixed gas with different preset temperatures are measured through the gas chromatography-mass spectrometer, the gas content data are converted into the gas partial pressure data, the liquefaction temperature points are obtained through comparison, and therefore the liquefaction temperature of each gas is obtained, and the liquefaction temperature of the mixed gas is conveniently measured.
Drawings
Fig. 1 is a system for measuring liquefaction temperature of a mixed gas according to an embodiment of the present disclosure.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature. In addition, "upper" and "lower" in the present invention indicate only relative positions, and do not indicate absolute positions.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
The application provides a liquefaction temperature test system of mixed gas, in one embodiment, the liquefaction temperature test system comprises a gas supply device, a gas storage device, a gas pressure sensor, a temperature control device and a gas chromatography-mass spectrometer; the gas supply device is connected with the gas storage device, and the inside of the gas supply device is communicated with the inside of the gas storage device; the air pressure sensor is connected with the air supply device and communicated with the inside of the air storage device; the gas chromatography-mass spectrometer is connected with the gas supply device and communicated with the inside of the gas storage device; the gas storage device and the air pressure sensor are both arranged in the temperature control device.
According to the liquefaction temperature testing system for the mixed gas, the gas to be tested with certain pressure is filled into the gas storage device through the gas supply device, the temperature control system is started to control the temperature within the preset range, after the temperature inside the gas storage device in the temperature control system reaches the set temperature, the temperature and the gas pressure data of the mixed gas with different preset temperatures are measured through the gas pressure sensor, the content data of each gas component in the mixed gas with different preset temperatures are measured through the gas chromatography-mass spectrometer, the gas content data are converted into the gas partial pressure data, the liquefaction temperature points are obtained through comparison, and therefore the liquefaction temperature of each gas is obtained, and the liquefaction temperature of the mixed gas is conveniently measured.
In order to facilitate understanding of the liquefaction temperature test system of the mixed gas of the present application, the liquefaction temperature test system of the present application will be further described with reference to the accompanying drawings.
As shown in fig. 1, the system 10 for measuring the liquefaction temperature of a mixed gas includes: the gas supply device 100100, the gas storage device 200200, the air pressure sensor 300300, the temperature control device 400400, and the GC-MS 500500. The gas supply device 100 is used for providing a gas to be tested, the gas storage device 200 is used for storing the gas to be tested, the gas pressure sensor 300 is used for testing the stored temperature and gas pressure data of the gas to be tested, the temperature control device 400 is used for controlling the stored temperature of the gas to be tested within a preset range, and the gas chromatograph-mass spectrometer 500 is used for measuring the content data of the gas components to be tested.
The gas supply device 100 is connected to the gas storage device 200, and the inside of the gas supply device 100 is communicated with the inside of the gas storage device 200. In one embodiment, the gas supply device 100 has a sealed cavity, the gas storage device 200 has a sealed cavity, and the inside of the gas supply device 100 is communicated with the inside of the gas storage device 200, that is, the sealed cavity of the gas supply device 100 is communicated with the sealed cavity of the gas storage device 200, so that the gas in the sealed cavity of the gas supply device 100 can flow into the sealed cavity of the gas storage device 200.
The air pressure sensor 300 is connected to the air supply device 100, and the air pressure sensor 300 is communicated with the inside of the air storage device 200. In one embodiment, the gas storage device 200 has a sealed cavity, and the gas pressure sensor 300 is communicated with the inside of the gas storage device 200, that is, the gas pressure sensor 300 is communicated with the sealed cavity of the gas storage device 200, so that the gas pressure sensor 300 can contact the gas in the sealed cavity of the gas storage device 200.
The gas chromatograph-mass spectrometer 500 is connected with the gas supply device 100, and the gas chromatograph-mass spectrometer 500 is communicated with the inside of the gas storage device 200. In an embodiment, the gas storage device 200 has a sealed cavity, the gas chromatograph-mass spectrometer 500 has a measurement chamber, and the gas chromatograph-mass spectrometer 500 is communicated with the inside of the gas storage device 200, that is, the measurement chamber of the gas chromatograph-mass spectrometer 500 is communicated with the inside of the gas storage device 200, so that the gas in the sealed cavity of the gas storage device 200 can flow through to the measurement chamber of the gas chromatograph-mass spectrometer 500.
The gas storage device 200 and the air pressure sensor 300 are both disposed in the temperature control device 400. In an embodiment, the temperature control device 400 has a receiving cavity, and the gas storage device 200 and the air pressure sensor 300 are both disposed in the receiving cavity of the temperature control device 400, so that the temperature control device 400 can control the temperature of the gas storage device 200 and the air pressure sensor 300 can measure the actual temperature of the gas storage device 200.
In one embodiment, the gas supply device 100 is a gas cylinder. Using a steel cylinder as the gas supply device 100 enables safe storage and transportation of gas.
In one embodiment, the gas storage device 200 is a stainless steel sealed container. The gas storage device 200 can be sealed using a stainless steel airtight container, preventing gas leakage.
In one embodiment, the temperature control device 400 is a refrigerator. Using a refrigerator as the temperature control device 400 enables precise adjustment of the temperature inside the temperature control device 400, in one embodiment, the refrigerator is a low temperature refrigerator having a temperature range of-80 ℃ to 0 ℃, an adjustment precision of 0.1 ℃, and a temperature uniformity of ± 0.5 ℃.
In one embodiment, the GC-MS 500 is a GC-MS. In one embodiment, the GC MS 500 has an automatic six-way gas injection valve for gas injection. In one embodiment, the gc-ms 500 further has a split/no-split sample inlet for introducing a sample to the chromatography column for separation. In one embodiment, the gc-ms 500 further has a mass spectrometer for detecting the gas component.
In an embodiment, the gas supply device 100 is connected to the automatic six-way gas injection valve of the gas chromatograph-mass spectrometer 500. Thus, when the automatic six-way gas injection valve is opened, gas in the gas supply device 100 enters the measurement chamber inside the gas supply device 100 and is introduced into the chromatographic column through the split/non-split injection port, the operation speeds of the components in the chromatographic column are different after a period of time as the adsorption force of the adsorbent on the chromatographic column to each gas component is different, the component with the weakest adsorption force is easily absorbed and desorbed, the component with the strongest adsorption force firstly leaves the chromatographic column and enters the mass spectrometry detector, the component with the strongest adsorption force is least easily absorbed and desorbed and finally leaves the chromatographic column and enters the mass spectrometry detector, and thus the content data of the components are separated from each other in the chromatographic column and then respectively enter the mass spectrometry detector to be detected and recorded.
In order to collect the signal generated by the air pressure sensor 300, in one embodiment, the liquefaction temperature test system further includes a data acquisition card 600, the data acquisition card 600 is electrically connected to the air pressure sensor 300, and the data acquisition card 600 is configured to collect the signal generated by the air pressure sensor 300. In this way, signals generated when the air pressure sensor 300 senses the gas in the gas storage device 200 can be collected by the data collection card, so that the data collection and the subsequent analysis are more convenient.
In one embodiment, the data acquisition card 600 is electrically connected to the air pressure sensor 300 through a wire. In another embodiment, the data acquisition card 600 is electrically connected to the air pressure sensor 300 through a data line.
In order to process the collected or tested data, in one embodiment, the liquefaction temperature test system further includes a computer subsystem 700, and the computer subsystem 700 is electrically connected to the data acquisition card 600 and the gas chromatograph-mass spectrometer 500, respectively. In this way, the content data measured by the gas chromatograph-mass spectrometer 500 and the temperature and pressure data measured by the pressure sensor 300 and collected by the data collection card 600 can be processed by the computer subsystem 700 to obtain the liquefaction temperature of the mixed gas. In one embodiment, the computer subsystem 700 is a processing system on a computer.
For the accurate quality of measuring the gas that awaits measuring that gas supply device 100 provided, in one of them embodiment, liquefaction temperature test system still includes mass flow meter 800, gas supply device 100 passes through mass flow meter 800 with gas storage device 200 is connected, just the inside of gas supply device 100, the inside of mass flow meter 800 with the inside of gas storage device 200 communicates in proper order, mass flow meter 800 is used for measuring the follow gas supply device 100 flows in the quality of the gas of gas storage device 200. By providing the mass flow meter 800 between the gas supply device 100 and the gas storage device 200, the mass of the gas to be measured flowing out of the gas supply device 100 before entering the gas storage device 200 can be accurately measured.
In one embodiment, the mass flow meter 800 has a measuring chamber, and the inside of the gas supply device 100, the inside of the mass flow meter 800 and the inside of the gas storage device 200 are sequentially communicated, that is, the sealed chamber of the gas supply device 100, the measuring chamber of the mass flow meter 800 and the sealed chamber of the gas storage device 200 are sequentially communicated.
In order to reduce the pressure of the gas to be tested from high pressure to low pressure, in one embodiment, the liquefaction temperature test system further includes a pressure reduction device 910, the gas supply device 100 is connected to the gas storage device 200 through the pressure reduction device 910, the inside of the gas supply device 100, the inside of the pressure reduction device 910 and the inside of the gas supply device 100 are sequentially communicated, and the pressure reduction device 910 is used for reducing the pressure of the gas flowing out from the gas supply device 100 and then flowing into the gas storage device 200. In one embodiment, the pressure reducing device 910 is a cylinder pressure reducing valve. Through the arrangement of the pressure reducing device 910, the gas to be tested flowing out from the gas supply device 100 is reduced from high pressure to low pressure and then enters the gas storage device 200 for relevant tests, so that the pressure of the gas to be tested can meet the requirement excessively.
In one embodiment, the pressure reducing device 910 has a pressure reducing cavity, and the inside of the gas supply device 100, the inside of the pressure reducing device 910 and the inside of the gas storage device 200 are sequentially communicated, i.e., the sealed cavity of the gas supply device 100, the pressure reducing cavity of the pressure reducing device 910 and the sealed cavity of the gas storage device 200 are sequentially communicated.
In order to stabilize the gas flow rate, in one embodiment, the liquefaction temperature test system further includes a constant flow device 920, the gas supply device 100 is connected to the gas storage device 200 through the constant flow device 920, the interior of the gas supply device 100, the interior of the constant flow device 920 and the interior of the gas supply device 100 are sequentially communicated, and the constant flow device 920 is configured to stabilize the gas flow rate flowing out of the gas supply device 100 and then flow into the gas storage device 200. In one embodiment, the constant flow device 920 is a gas constant flow valve. By arranging the constant flow device 920, the gas to be measured flows out of the gas supply device 100, passes through the constant flow device 920, has a gentle flow rate, and then enters the gas supply device 100.
In one embodiment, the constant flow device 920 has a constant flow cavity, and the interior of the gas supply device 100, the interior of the constant flow device 920 and the interior of the gas storage device 200 are sequentially communicated, that is, the sealed cavity of the gas supply device 100, the constant flow cavity of the constant flow device 920 and the sealed cavity of the gas storage device 200 are sequentially communicated.
In order to ensure the accuracy of the test, in one embodiment, the liquefaction temperature test system further includes a vacuum unit 930, the vacuum unit 930 is connected to the gas supply unit 100, and the inside of the vacuum unit 930 is communicated with the inside of the gas supply unit 100. By arranging the vacuumizing device 930, the system is vacuumized before the experiment is started, interference gas in the system is exhausted, the accuracy of the test is ensured, and meanwhile, the vacuumizing can also detect whether the air tightness of the system is good or not.
In one embodiment, the vacuum unit 930 has a receiving cavity, and the interior of the vacuum unit 930 and the interior of the gas supply unit 100 are communicated with each other, that is, the receiving cavity of the vacuum unit 930 and the interior of the gas supply unit 100 are communicated with each other. In one embodiment, the evacuation device 930 is a vacuum pump. In one embodiment, the vacuum unit 930 includes a vacuum control valve and a vacuum pump, the vacuum pump is connected to the gas supply unit 100 through the vacuum control valve, and the vacuum control valve is used to control whether the gas supply unit 100 and the vacuum pump are communicated.
In order to facilitate the connection between the gas supply device 100 and the gas storage device 200, in one embodiment, a first ferrule connector is disposed on the gas storage device 200, and the first ferrule connector is communicated with the inside of the gas storage device 200; the gas supply device 100 is detachably connected with the first ferrule connector through a first gas supply pipeline, and the inside of the first gas supply pipeline is communicated with the inside of the gas supply device 100 and the inside of the first ferrule connector respectively. By arranging the first sleeve joint on the gas storage device 200, the gas supply device 100 can be detachably connected with the first sleeve joint through the first gas supply pipeline, so that the gas supply device 100 and the gas storage device 200 can be conveniently connected, the insides of the gas supply device and the gas storage device 200 are communicated, gas can be circulated, and the gas supply device 100 and the gas storage device 200 can be conveniently detached to be respectively transported, stored, maintained or replaced.
In order to facilitate the connection between the air pressure sensor 300 and the air storage device 200, in one embodiment, a second ferrule connector is disposed on the air storage device 200, and the second ferrule connector is communicated with the inside of the air storage device 200; the air pressure sensor 300 is detachably connected to the second ferrule connector through a second air supply pipe, and the inside of the second air supply pipe is respectively communicated with the air pressure sensor 300 and the inside of the second ferrule connector. By arranging the second sleeve joint on the gas storage device 200, the gas pressure sensor 300 can be detachably connected with the second sleeve joint through a second gas supply pipeline, so that the gas pressure sensor 300 can be conveniently connected with the gas storage device 200, the gas pressure sensor 300 and the gas storage device 200 are communicated internally, gas can be circulated, and the gas pressure sensor 300 and the gas storage device 200 can be conveniently detached to be respectively transported, stored, maintained or replaced.
In order to facilitate the connection of the gas chromatograph-mass spectrometer 500 with the gas storage device 200, in one embodiment, a third bayonet joint is arranged on the gas storage device 200, and the third bayonet joint is communicated with the inside of the gas storage device 200; the gas chromatography-mass spectrometer 500 is detachably connected with the third chuck joint through the third gas supply pipeline, and the inside of the third gas supply pipeline is respectively communicated with the gas chromatography-mass spectrometer 500 and the inside of the third chuck joint. By arranging the third bayonet joint on the gas storage device 200, the gas chromatograph-mass spectrometer 500 can be detachably connected with the third bayonet joint through the third gas supply pipeline, so that the gas chromatograph-mass spectrometer 500 and the gas storage device 200 can be conveniently connected and can be internally communicated to allow gas to flow, and meanwhile, the gas supply device 100 and the gas storage device 200 can be conveniently detached to be respectively transported, stored, maintained or replaced.
In one embodiment, the gas storage device 200 is provided with a first ferrule connector, a second ferrule connector and a third ferrule connector, and the first ferrule connector, the second ferrule connector and the third ferrule connector are respectively communicated with the inside of the gas storage device 200; the gas supply device 100 is detachably connected with the first ferrule connector through a first gas supply pipeline, and the interior of the first gas supply pipeline is respectively communicated with the interior of the gas supply device 100 and the interior of the first ferrule connector; the air pressure sensor 300 is detachably connected with the second ferrule connector through a second air supply pipeline, and the interior of the second air supply pipeline is respectively communicated with the air pressure sensor 300 and the interior of the second ferrule connector; the gas chromatography-mass spectrometer 500 is detachably connected with the third chuck joint through the third gas supply pipeline, and the inside of the third gas supply pipeline is respectively communicated with the gas chromatography-mass spectrometer 500 and the inside of the third chuck joint.
In order to keep the temperature of the gas measured by the gas chromatograph-mass spectrometer 500 consistent with the temperature of the gas stored in the gas storage device 200, in one embodiment, the outer surface of the third gas supply pipe is covered with an insulating layer. The outer surface of the third gas supply pipeline connecting the gas storage device 200 and the gas chromatography-mass spectrometer 500 is coated with the heat insulation layer, so that the temperature of the gas flowing out of the gas storage device 200 can be kept consistent after passing through the third gas supply pipeline and then flowing into the gas chromatography-mass spectrometer 500, and the measurement error is reduced.
In order to sufficiently exhaust the air in the system, in one embodiment, referring to fig. 1 again, the liquefaction temperature test system further includes a vacuum unit 930, an interior of the vacuum unit 930 is connected to the air supply unit 100, and the vacuum unit 930 is communicated with the interior of the air supply unit 100; the liquefaction temperature test system further comprises a gas pump 940, one end of the gas pump 940 is connected with the gas storage device 200, the other end of the gas pump 940 is connected with the gas chromatography-mass spectrometer 500, and the inside of the gas pump 940 is respectively communicated with the gas storage device 200 and the gas chromatography-mass spectrometer 500. By arranging the gas pump 940 between the gas storage device 200 and the gas chromatograph-mass spectrometer 500, when the gas pump 940 works, the gas circulation in the system can be promoted, and the air in the system can be discharged.
In one embodiment, the gas to be measured is perfluoroisobutyronitrile (C)4F7N) and carbon dioxide (CO)2) Mixed gas (10% C)4F7N/90％CO2) As the gas to be measured. In one embodiment, the gas storage device is a refrigerator at-80 ℃. In one embodiment, the baroceptor is model number UNIK5000, ranging from 0 to 1MPa, with a precision of four parts per million and a full range error of 0.4 kPa. In one embodiment, the data acquisition card is of the type USB-6001. In one embodiment, the sample injection mode of the gas chromatograph-mass spectrometer is gas automatic six-way valve sample injection.
In one embodiment, the steps of testing the mixed gas by using the liquefaction temperature testing system of the mixed gas of the present application are as follows:
step (1), assembling a liquefaction temperature test system of the mixed gas, filling 0.65MPa of gas, keeping for 24 hours, considering that the gas tightness of the system is good when the gas pressure drop value is less than 2kPa, detecting the gas tightness of the system, starting a vacuum pump when the gas tightness of the system is good, and pumping the gas pressure of the system to about 1 kPa;
step (2), closing the stop valve, filling the gas to be detected to 0.1MPa, starting the gas pump to circulate for 5min for discharging the air in the system, then starting the vacuum pump again, opening the stop valve, and pumping the system to about 1 kPa;
step (3) and step (2) are carried out twice again to ensure that the residual air quantity in the system is less than 10 ppm;
step (4), filling gas to be detected to 0.65 MPa;
step (5), starting a temperature control system, and controlling the temperature within a set temperature range;
step (6), after the temperature in the sealing cavity reaches a set temperature, recording sensor data, wherein the sensor data comprise temperature and/or air pressure;
step (7), starting a pump/valve for driving gas circulation to uniformly mix gas in the system, and measuring C in the gas by a gas chromatography-mass spectrometer4F7N and CO2Content (c);
and (8) repeating the steps (5) to (7), and measuring the gas component content data at different temperature points.
In one embodiment, the liquefaction temperature test system according to the present application obtains data and calculates the liquefaction temperature of the mixed gas as follows:
step (1), introducing mixed gas into a gas storage device through a gas supply device at normal temperature and normal pressure, metering the amount of the introduced gas through a mass flow meter, recording through a gas pressure sensor to obtain a system gas pressure value, and calibrating the volume of the whole system by utilizing an actual gas state equation, namely a 1-mole van der Waals gas state equation with the temperature, the pressure and the molar volume of T, p and V0 respectively;
step (2), cleaning a system pipeline through a vacuum pump, so that the system can be filled with mixed gas to be detected;
step (3), measuring and obtaining a temperature and air pressure curve by adjusting the temperature of the system;
circulating the system through a gas pump to ensure that gas in each part of the system is uniformly distributed, and filling a quantitative tube of an automatic sample introduction valve of the gas chromatography-mass spectrometer with gas;
step (5), measuring the content of a target gas component by using a gas chromatography-mass spectrometer, further obtaining a temperature and target gas component partial pressure curve, for example, converting the content of the gas component into a gas partial pressure value by using a gas state equation, and drawing the gas partial pressure data obtained under different temperature conditions to obtain the temperature and gas partial pressure curve;
and (6) analyzing the target gas partial pressure curve to obtain the liquefaction temperature of the target gas.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A system for testing the liquefaction temperature of a mixed gas, comprising: the device comprises a gas supply device, a gas storage device, a gas pressure sensor, a temperature control device and a gas chromatography-mass spectrometer;
the gas supply device is connected with the gas storage device, and the inside of the gas supply device is communicated with the inside of the gas storage device;
the air pressure sensor is connected with the air supply device and communicated with the inside of the air storage device;
the gas chromatography-mass spectrometer is connected with the gas supply device and communicated with the inside of the gas storage device;
the gas storage device and the air pressure sensor are both arranged in the temperature control device.
2. The liquefaction temperature test system of claim 1, further comprising a data acquisition card electrically connected to the barometric pressure sensor, the data acquisition card configured to acquire a signal generated by the barometric pressure sensor.
3. The liquefaction temperature test system of claim 1, further comprising a mass flow meter, wherein the gas supply device is connected to the gas storage device through the mass flow meter, and the inside of the gas supply device, the inside of the mass flow meter and the inside of the gas storage device are sequentially communicated, and the mass flow meter is configured to measure the mass of the gas flowing from the gas supply device into the gas storage device.
4. The liquefaction temperature test system of claim 1, further comprising a pressure reduction device, wherein the gas supply device is connected to the gas storage device through the pressure reduction device, the interior of the gas supply device, the interior of the pressure reduction device and the interior of the gas supply device are sequentially communicated, and the pressure reduction device is configured to reduce the pressure of the gas flowing out from the gas supply device and then flow into the gas storage device.
5. The liquefaction temperature test system of claim 1, further comprising a constant flow device, wherein the gas supply device is connected to the gas storage device through the constant flow device, the interior of the gas supply device, the interior of the constant flow device and the interior of the gas supply device are sequentially communicated, and the constant flow device is used for decompressing the gas flowing out of the gas supply device and then flowing into the gas storage device.
6. The liquefaction temperature test system of claim 1, further comprising a vacuum evacuation device, an interior of the vacuum evacuation device being connected to the gas supply device, and the vacuum evacuation device being in communication with an interior of the gas supply device.
7. The liquefaction temperature test system of claim 1, wherein a first ferrule connector is arranged on the gas storage device, and the first ferrule connector is communicated with the interior of the gas storage device;
the air supply device is detachably connected with the first clamping sleeve connector through a first air supply pipeline, and the interior of the first air supply pipeline is communicated with the interior of the air supply device and the interior of the first clamping sleeve connector respectively.
8. The liquefaction temperature test system of claim 1, wherein a second ferrule connector is arranged on the gas storage device, and the second ferrule connector is communicated with the interior of the gas storage device;
the air pressure sensor is detachably connected with the second clamping sleeve connector through a second air supply pipeline, and the interior of the second air supply pipeline is communicated with the air pressure sensor and the interior of the second clamping sleeve connector respectively.
9. The liquefaction temperature test system of claim 1, wherein a third bayonet joint is arranged on the gas storage device, and the third bayonet joint is communicated with the inside of the gas storage device;
the gas chromatography-mass spectrometer is detachably connected with the third clamping sleeve joint through a third gas supply pipeline, and the inside of the third gas supply pipeline is respectively communicated with the gas chromatography-mass spectrometer and the inside of the third clamping sleeve joint.
10. The liquefaction temperature test system of claim 9, wherein an outer surface of the third gas supply pipe is coated with an insulation layer.
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