Volatile organic gas automatic heating sampling device

Abstract

A volatile organic compound gas automatic heating and sampling device comprises a box body; at least one gas bag for collecting volatile organic compound gas is arranged in the box body; a first space is formed in the gas bag; the inner wall of the box body and the outer wall of the gas bag form a second space; a quick coupler is arranged on the side wall of the box body; the gas bag comprises a gas nozzle; a gas valve is arranged on the gas nozzle; the gas nozzle is configured to be connected with the quick coupler in the box body; after connection, the gas valve on the gas bag is in an open state and the gas in the gas bag is controlled by the quick coupler; and a heating constant temperature part is arranged on the box body and used for heating the gas in the gas bag and keeping the temperature of the gas in the gas bag. The heating constant temperature part supports simultaneous heating of multiple gas samples, so that the samples in the gas bag are heated to effectively prevent liquid drops on the wall of the gas bag from being condensed.

Description

technical field [0001] The invention relates to an automatic sampling device, and further relates to an automatic heating sampling device for volatile organic compound gas. Background technique [0002] Volatile organic compounds (VOCs) refer to various organic compounds with a boiling point of 50-260°C under normal pressure. The main components are: hydrocarbons, halogenated hydrocarbons, oxygen hydrocarbons and nitrogen hydrocarbons, including: benzene series, organic Chlorides, Freon series, organic ketones, amines, alcohols, ethers, esters, acids and petroleum hydrocarbon compounds, etc. Among the more than 900 kinds of indoor chemical substances and biological substances that have been confirmed so far, there are at least 350 kinds of volatile organic compounds (VOCs) (> 1ppb), of which more than 20 kinds are carcinogens or mutagens, and some long-term exposures are harmful. Can cause cancer (lung cancer, leukemia) or cause miscarriage, fetal malformation and growth...

AI Technical Summary

Problems solved by technology

But in actual operation, the moment the air bag is taken out from the sample heating box, the water vapor in the gas will condense and adsorb on the air bag, and some VOCs will dissolve in the water droplets, resulting in low analysis results

In addition, the air bag injection mainly relies on manually squeezing the air bag, and the strength of the analyst is different, and there will be errors in the sample volume.

[0004] One method in the prior art is to use an air bag for sampling, take it out after being heated in an oven in the laboratory, and manually squeeze the air bag for sample analysis; the disadvantage of this method is that the droplet condensation phenomenon is eliminated during the heating process of the air bag, but The droplet will condense again when it is taken out from the oven, the heating process does not substantially eliminate the condensation of the droplet and reduce the adsorption loss; the manual extrusion injection volume should not be controlled, causing analysis errors

[0005] Another method in the prior art is to use a hair dryer to blow the air bag with hot air for each analysis, and then manually squeeze the air bag for sample analysis. The disadvantage of this method is that the heating temperature cannot be controlled by the hair dryer, and the liquid droplet cannot be guaranteed. The condensation phenomenon is eliminated, causing liquid droplets to enter the analytical instrument and damage the instrument; more than two people are required to work together, which wastes manpower; each air bag needs to be purged and heated separately, and the work efficiency is low; the manual extrusion injection volume is not suitable for control, causing analysis error

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