Split gas sample injection device

Abstract

The invention relates to a split gas sample injection device which is used for analysis of total sulfur in gas of a petrochemical enterprise, a pressure stabilizing valve is arranged on a sample injection carrier gas pipe, two communicated three-ways are arranged on a conveying pipe, the first three-way is provided with a device for regulating the split ratio, the second three-way is provided with a carrier gas flow rate regulating and pressure stabilizing device for regulating the conversion rate of an instrument, and an outlet of the second three-way is communicated with a gas analyzer. The split gas sample injection device can analyze a variety of gas samples with different sulfur contents by taking a gas sample injection device, a liquid standard sample and the instrument as parameters, thereby expanding the analysis range of the sulfur content in the gas, simplifying the operation, improving the analysis speed, saving the time for debugging the instrument, saving the cost for purchasing the liquid standard sample and the instrument and reducing the production cost.

Description

technical field [0001] The invention relates to a split flow sampling device for analyzing impurity content or composition in gas, which is mainly used for analyzing the content of impurities such as total sulfur in gas. Background technique [0002] At present, most of the analysis of total sulfur in gas in petrochemical enterprises is determined by coulometric analyzers, and samples are injected by domestic syringes. Because the needle of the domestic syringe is easy to block, the injection pad of the combustion tube is easy to leak air after repeated needle sticking, debris is easy to enter the combustion tube, the wall of the syringe is easy to leak air, the reading is greatly affected by human factors, and the residual sample in the syringe It is difficult to replace cleanly, so that the repeatability and accuracy of the total sulfur analysis in the gas are very poor, especially when the sulfur content is very low. If a gas sampler is used to inject samples at a consta...

AI Technical Summary

Problems solved by technology

At present, most of them change the concentration of the liquid standard sample and the operating parameters of the instrument according to the sulfur content in the sample, and readjust the conversion rate. This is time-consuming and laborious, and cannot meet the fast and accurate analysis requirements of the central control.

At present, there are ready-made gas samplers at home and abroad. The injection volume is 1mL, 2mL, 4mL, 10mL, etc., but they cannot be divided, and the injection volume cannot be adjusted at any time. Only quantitative tubes of different sizes can be replaced, which is inconvenient to operate.

For samples with very low or high sulfur content, non-detection or over-range will occur, and it is difficult for one injection volume to adapt to the sulfur content from several mg / m 3 to thousands of mg / m 3 The analysis of gas samples currently requires multiple people, multiple instruments, and separate analysis of high and low sulfur, which wastes a lot of manpower and material resources

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