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Gas chromatography programmed heating injection system and method using vortex effect

A technology of programmed temperature rise and gas chromatography, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of low refrigeration efficiency, unfavorable promotion and use, high maintenance cost, etc., achieve great practical value and promotion value, and light weight , cost-saving effect

Pending Publication Date: 2018-02-16
蒋万枫
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of liquid nitrogen or liquid carbon dioxide is that the maintenance cost is high. Due to the heat absorption of liquid nitrogen and liquid carbon dioxide, it is easy to vaporize. Regardless of whether it is used or not, the liquid will be consumed over time.
The refrigeration efficiency of the semiconductor refrigeration method is not too high, which is not conducive to popularization and use

Method used

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  • Gas chromatography programmed heating injection system and method using vortex effect

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Comparison scheme
Effect test

Embodiment 1

[0045] The specific operation process of this system is: when the system starts to work, the injection port is in a high temperature state, the compressed air passes through the control valve 2 to control the total gas volume entering the vortex tube 4, the gas passes through the vortex tube 4, and the inner generator generates heat and cold Two streams of gas, the gas at the cold end is discharged from the outlet 7 of the cold end of the vortex tube, and enters the inlet of the cold trap of the inlet through the pipeline to cool down the inlet, and the temperature of the gasification chamber is measured by the temperature sensor 12. When the temperature reaches the set temperature . The total gas volume entering the vortex tube 4 is reduced by the control valve 2, the refrigerating capacity of the vortex tube is reduced, the heating device 10 is turned on, and the gasification chamber of the inlet is controlled at a set temperature through dynamic balance. Inject the sample, ...

Embodiment 2

[0047] The specific operation process of this system is: when the system starts to work, the injection port is in a high temperature state, the compressed air is controlled by the control valve 2 to control the total gas volume entering the vortex tube 4, and the gas in the vortex tube 4 passes through the generator in the vortex tube 4 To generate two streams of hot and cold gases, open the control valve 2 to increase the total gas volume entering the vortex tube 4, adjust the regulating valve 5 at the hot end of the vortex tube, increase the gas output at the cold end, and accelerate the reduction of the inlet temperature. The gas at the cold end is discharged from the outlet 7 of the cold end of the vortex tube, and enters the inlet of the cold trap of the injection port through the pipeline to cool down the temperature of the injection port. The temperature of the gasification chamber is measured by the temperature sensor 12. Adjust the valve 5 to gradually reduce the gas t...

Embodiment 3

[0050] The compressor stores the compressed air in the air storage tank, and enters the vortex tube through the gas dryer through the control valve.

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Abstract

A gas chromatographic temperature-programmed sampling system utilizing the vortex refrigeration effect, comprising a compressed gas regulating valve, a vortex tube, and a temperature-programmed sampling port, characterized in that a heating device and The temperature sensor is equipped with a cold trap outside, and the cold trap wraps the vaporization chamber, the heating device and the temperature sensor, and has a space and a channel for accommodating cooling gas. The cold trap is set There is a cooling gas inlet and an outlet; the compressed gas is connected to the inlet of the vortex tube through the compressed gas regulating valve through a pipeline, and the outlet of the cold end of the vortex tube is connected to the cold trap inlet of the temperature-programmed sampling port through a pipeline. A gas chromatographic temperature programming sampling method utilizing the vortex refrigeration effect, comprising the following steps: S1 high temperature stage of the sample inlet, S2 low temperature stage of the sample inlet, S3 temperature balance stage of the sample inlet, and S4 temperature rise stage of the sample inlet.

Description

technical field [0001] The invention relates to the field of detection instruments, in particular to a gas chromatography programmed temperature sampling system (PTV) and a method. Background technique [0002] Improving analytical sensitivity is almost an eternal topic in analytical chemistry. As far as gas chromatography is concerned, instrument manufacturers and analysts are always trying to manufacture highly sensitive instruments and develop highly sensitive methods. Especially in environmental analysis, drug analysis and food analysis, relevant laws and regulations have high requirements for sensitivity. It is this requirement that promotes the development of instruments, and the development of instruments has made lawmakers put forward higher detection sensitivity requirements. This interaction is iterative. [0003] The traditional gas chromatography sampling method uses the liner as the carrier for solvent vaporization. Due to the large expansion rate and low boi...

Claims

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Application Information

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IPC IPC(8): G01N30/12
CPCG01N30/12G01N2030/121G01N2030/127
Inventor 蒋万枫张凤艳
Owner 蒋万枫
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