Device and system for detecting liquid and foam in gas transmission pipeline

Abstract

The invention relates to a device and system for detecting liquid and foam in a gas transmission pipeline, the device comprising a first gas transmission pipeline, a sensor, a flow switching valve, a second gas transmission pipeline, a liquid transmission pipeline and a control unit , the gas outlet of the first gas transportation pipeline is connected to the inlet of the flow switching valve, the gas outlet of the flow switching valve is connected to the inlet of the second gas transmission pipeline, and the outlet of the flow switching valve The liquid port is connected to the liquid inlet of the liquid transmission pipeline; the sensor is installed on the first gas transmission pipeline, and the sensor and the flow path switching valve are respectively electrically connected to the control unit, and the detection device is used for gas detection device, the gas generator gas outlet of the gas detection device is connected to the inlet of the first gas transmission pipeline, the gas outlet of the second gas transmission pipeline is connected to the gas detector of the gas detection device, and the liquid transmission pipeline The liquid outlet is connected to the waste liquid cup.

Description

technical field [0001] The invention relates to the field of gas transmission systems of atomic spectrum analysis instruments, in particular to a device and system for detecting liquid and foam in gas transmission pipelines. Background technique [0002] As a trace and ultra-trace heavy metal total and speciation analysis instrument for elements such as arsenic and mercury, atomic fluorescence spectrometer has been widely used in food safety, environmental monitoring, tap water, geological prospecting, metallurgy and scientific research. During the analysis process of the atomic fluorescence spectrometer, potassium borohydride reacts with the acid in the sample to generate the gaseous substances of the analyte elements, hydrogen and other substances; the gaseous substances of the analyte elements and hydrogen generated are carried by the carrier gas in After gas-liquid separation in the gas-liquid separator to remove water vapor, it enters the atomizer. Hydrogen gas is igni...

AI Technical Summary

Problems solved by technology

However, it should be pointed out that the following issues have not been resolved:

[0004] (1) After the atomic fluorescence has been running for a long time, a large amount of water vapor will condense into water droplets in the silicone rubber tube connecting the gas-liquid separator and the atomizer, hindering the transmission of gas, and even completely blocking the pipeline in severe cases. Affect the reliability of the analysis results

[0005] (2) For sample solutions with relatively high organic matter content, a large amount of foam will be formed in the gas-liquid separator, and the gas-liquid separator without defoaming function design cannot restrict the foam from carrying a large amount of liquid into the atomizer through the connecting pipeline , will eventually lead to serious damage to the atomizer such as short circuit and pollution

[0006] (3) For a gas-liquid separator that requires a peristaltic pump to extract waste liquid, the aging of the peristaltic pump tube is an inevitable problem

The ion pair reagents mainly used in reverse ion pair chromatography, such as alkyl sulfate and quaternary ammonium salt, etc., will form a large amount of foam during the steam reaction process, which will block the connection between the gas-liquid separator and the atomizer in severe cases. The gas transmission pipeline between them will affect the accuracy of the analysis results

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