Device for using pipeline gas as carrier gas of chemical analysis instrument

Abstract

The invention discloses a device for using pipeline gas as carrier gas of a chemical analysis instrument. The device uses gas of a pipeline gas source with purity meeting carrier gas requirements as the carrier gas of the chemical analysis instrument, and comprises a pipeline carrier gas feeding pipe which is led from the pipeline serving as the carrier gas source, wherein the pipeline carrier gas feeding pipe is connected with a purification device of the chemical analysis instrument. An existing bottled carrier gas feeding pipe can also be connected with the pipeline carrier gas feeding pipe in parallel and then connected with the purification device of the chemical analysis instrument. According to the device, existing resources are utilized, chemical analysis cost is reduced, operation safety and stability are improved, and utilization efficiency is high.

Description

technical field [0001] This application belongs to the field of industrial gas chemical analysis. Background technique [0002] In gas chromatography, the mobile phase is gas, which is called carrier gas. The function of the carrier gas is to carry the gas sample or the vaporized sample gas into the chromatographic column at a certain flow rate for separation, and then bring the separated components into the detector for detection, and finally flow out of the chromatographic system to be emptied Or collection, the carrier gas only plays a role of carrying and does not participate in separation. [0003] Domestic laboratories for industrial gas analysis usually use high-purity gases loaded in high-pressure gas cylinders (referred to as: cylinder-loaded gas), such as argon, helium, etc., as carrier gases. The use of bottled gas mainly has the following defects: [0004] One is that the container loaded with the carrier gas is a high-pressure steel cylinder, such as a high-p...

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Problems solved by technology

[0005] Second, the purity of the bottled gas is not completely consistent, and the purity of each bottle is relatively different, which is likely to cause analysis deviations; in addition, the trace impurities remaining in the cylinder cleaning will also cause certain pollution to the bottled gas, which in turn will cause damage to the chromatograph. Contamination, which can easily damage the precision measuring elements of the chromatograph

[0006] The third is that the operation process of replacing the gas cylinder is cumbersome; when changing the gas cylinder, it is necessary to repeatedly switch the gas cylinder and the pressure reducing valve to remove the air in the pressure reducing valve cavity. Leakage of the carrier gas path will cause baseline drift and noise, and affect the sensitivity of the discharge detector. In addition, it is easy to carry some impurities into the gas path system of the chemical analysis instrument during the replacement process, causing instrument failure

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