Sample gas intake system for on-line gas chromatographic detection

A technology of air intake system and gas chromatography, which is applied in the field of gas analysis, can solve the problems of sample gas sampling lag and easy damage of sampling pumps, and achieve accurate detection results and good stability

Pending Publication Date: 2018-04-10
HEFEI GOLD STAR MECHATRONICS TECH DEV CO LTD
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AI-Extracted Technical Summary

Problems solved by technology

[0005] 3. Some sampling pumps use the start-stop method for pressure balance, and the s...
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Abstract

The invention discloses a sample gas intake system for on-line gas chromatographic detection. According to the invention, the gas inlet end of a sampling pump is connected with a gas source, and the gas outlet end of the sampling pump is connected with a first gas inlet of a reversing valve assembly; the gas inlet of a quantitative sample gas storage unit is connected with the first gas outlet ofthe reversing valve assembly, and the gas outlet of the quantitative sample gas storage unit is connected with the second gas inlet of the reversing valve assembly; the second gas outlet of the reversing valve assembly is connected with a first exhaust port via a buffer tank; a carrier gas pipeline is connected with the third gas inlet of the reversing valve assembly; and the third gas output of the reversing valve assembly is connected with a detection unit. The sampling pump pumps sample gas to the quantitative sample gas storage unit, and the quantitative sample gas storage unit is connected with the buffer tank, so the sample gas in the quantitative sample gas storage unit has good stability; and switching of closed circuits is carried out via the reversing valve assembly, and the sample gas with stable pressure is conveyed to the detection unit by the carrier gas for detection, so accurate detection results can be obtained.

Application Domain

Component separation

Technology Topic

Gas pipelineProcess engineering +5

Image

  • Sample gas intake system for on-line gas chromatographic detection
  • Sample gas intake system for on-line gas chromatographic detection
  • Sample gas intake system for on-line gas chromatographic detection

Examples

  • Experimental program(1)

Example Embodiment

[0012] Combine figure 1 , 2 3. A sample gas intake system for online gas chromatography detection, the intake end of the sampling pump 10 is connected to the gas source, and the gas outlet end of the sampling pump 10 is connected to the first intake port 31 of the reversing valve assembly 30; The air inlet 41 of the sample gas quantitative storage unit 40 is connected to the first air outlet 32 ​​of the reversing valve assembly 30, and the air outlet 42 of the sample gas quantitative storage unit 40 is connected to the second air inlet 33 of the reversing valve assembly 30. The second air outlet 34 of the reversing valve assembly 30 is connected to the first exhaust port 61 via the buffer tank 50; the carrier gas pipeline 70 is connected to the third air inlet 35 of the reversing valve assembly 30, the reversing valve assembly The third air outlet 36 of 30 is connected to the detection unit. The sample gas quantitative storage unit 40 can be understood as a section of pipeline, which has an appropriate lumen volume to accommodate a sufficient amount of sample gas.
[0013] When the spool of the reversing valve assembly 30 is shifted, the following conduction path is selected: when the first air inlet 31 and the first air outlet 32 ​​of the reversing valve assembly 30 are connected, the sample gas reaches the sample gas quantitative storage unit 40 ; When the second air inlet 33 and the second air outlet 34 of the reversing valve assembly 30 are connected, the sample gas of the sample gas quantitative storage unit 40 reaches the buffer tank 50; the third air inlet of the reversing valve assembly 30 35. When the third gas outlet 36 is turned on, the carrier gas reaches the chromatographic column 80 and the detection unit 90 of the detection unit.
[0014] See figure 1 , 2 3. A three-way valve 20 is arranged between the outlet end of the sampling pump 10 and the first inlet 31 of the reversing valve assembly 30, and the inlet port 21 of the three-way valve 20 is connected to the outlet end of the sampling pump 10. The first and second air outlet ports 22 and 23 of the vent valve 20 are respectively connected to the first air inlet 31 and the second air outlet 62 of the reversing valve assembly 30. The setting of the three-way valve 20 can avoid frequent start and stop actions of the sampling pump 10, so as to prolong the service life of the sampling pump 10 and equipment failures caused by excessive starting current of electrical components.
[0015] See image 3 When the spool of the reversing valve assembly 30 is shifted, the following conduction paths are selected: the third air inlet 35 and the first air outlet 32 ​​of the reversing valve assembly 30 are connected and the second air inlet 33, the third When the gas outlet 36 is turned on, the carrier gas pushes the sample gas of the sample gas quantitative storage unit 40 to the chromatographic column 80 and the detection unit 90.
[0016] As a preferred solution, the reversing valve assembly 30 is a rotary two-position six-way reversing valve, which has a simple structure and can fulfill functional requirements.
[0017] The following briefly describes the working process of the present invention:
[0018] 1), such as figure 1 As shown, the gas inlet port 21 and the first gas outlet port 22 of the three-way valve 20 are connected, and the sampling pump 10 works and pumps sample gas. When the sample gas meets the required gas volume for detection, it is combined figure 2 , The three-way valve 20 is switched so that the air inlet 41 of the sample gas quantitative storage unit 40 is blocked and no sample gas continues to enter. At this time, the second air outlet port 23 of the three-way valve 20 is connected to the second air outlet 62 to ensure sampling The normal operation of pump 10;
[0019] 2), such as figure 2 As shown, the sample gas quantitative storage unit 40 and the buffer tank 50 are filled with sample gas, that is, the collected sample gas is retained in the sample gas quantitative storage unit 40 and the buffer tank 50, and the sample gas in the buffer tank 50 is used to compensate the sample gas quantitative The fluctuation of the sample gas pressure in the storage unit 40 prevents the pressure balance from being broken, and at the same time prevents external air from entering the sample gas quantitative storage unit 40, which affects the change of the sample gas composition;
[0020] 3) Before the start of the sample gas detection process, such as figure 1 , 2 As shown, when the third air inlet 35 and the third air outlet 36 are turned on, the carrier gas in the carrier gas pipeline 70 reaches the chromatographic column 80 of the detection unit and purges it, and then is discharged from the detector unit 90;
[0021] 4), such as image 3 As shown, after the sample gas pressure in the sample gas quantitative storage unit 40 is balanced and stable, the carrier gas pipeline 70 of the switching valve assembly 30 is connected to the third air inlet 35 and the first air outlet 32 ​​of the switching valve assembly 30. Then, the carrier gas purges the sample gas and delivers the sample gas to the chromatographic column 80 for separation, and finally reaches the detection unit 90 for detection.
[0022] Based on the above technical solution, the present invention has the following advantages: First, through the switching action of the three-way valve 20, the sampling pump 10 continues to operate, the sampling pump 10 has a long service life, and the sample gas collection time is high; second, through the three-way valve 20 To complete the sample gas collection and pressure balance; the buffer tube 50 can avoid the influence of external gas permeation on the sample gas in the quantitative loop when the pressure is balanced; the selection and switching of the six-way valve, the reversing valve assembly 30, is completed in time The purge of the chromatographic column 80 and the purge analysis of the sample gas quantitative storage unit 40 have a simple gas path structure.
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Description & Claims & Application Information

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