Universal sample introduction apparatus and universal sample introduction method for gaseous hydrocarbons and liquefied petroleum gas

Abstract

The invention provides a universal sample introduction apparatus and universal sample introduction method for gaseous hydrocarbons and liquefied petroleum gas. The universal sample introduction apparatus for gaseous hydrocarbons and liquefied petroleum gas comprises a sample introduction port (1), a sample flow control valve (2), a sample vaporizing chamber (3), a gas pressure reducing valve (4),a channel switching part (5), a gas quantification ring (6), a carrier gas inlet (7), a carrier gas flowmeter (8), an exhaust outlet (9), a counterbalance valve (10), an analyzer inlet (11) and a heating control module (12). The apparatus and method of the invention can realize accurate quantification of a sample; the counterbalance valve additionally arranged at the tail end of the quantificationring can guarantee stability and accuracy of pressure in the quantification ring, and sample sizes are maintained consistent every time through temperature control of the quantification ring, heat preservation of pipelines and passivation; and the apparatus can realize accurate quantification of the sample by increasing system pressure, so samples hard to detect or trace samples can be determined.

Description

technical field [0001] The invention relates to a sampling device for gaseous or liquid hydrocarbon samples, in particular to a sampling device for gaseous hydrocarbons and liquefied petroleum gas. Background technique [0002] With the development of petrochemical industry, liquefied petroleum gas has been paid more and more attention as a basic chemical raw material and new fuel. LPG refers to petroleum gas liquefied under high pressure or low temperature, referred to as "liquefied petroleum gas" or "liquefied gas". Its composition is propane, n-butane, isobutane and a small amount of ethane, organic compounds larger than carbon 5, unsaturated hydrocarbons, etc. LPG has the characteristics of flammability, explosiveness, gasification, thermal expansion, and corrosion. LPG is generally obtained from petroleum gas in oil and gas fields, refineries or ethylene plants. Compared with other fuels, LPG has the advantages of less pollution, high calorific value, easy transporta...

AI Technical Summary

Problems solved by technology

However, most refineries have a strong reaction to the composition of liquefied petroleum gas and the measurement results of sulfur content of liquefied petroleum gas, and the repeatability of the test is very poor. An order of magnitude, analysts have no confidence in their own data, repeatability and reproducibility data are too poor

After a large number of investigations and data verification, the main reason for the poor precision of the determination of LPG composition, sulfur content and water content is the problem of the sampling system: incomplete gasification of LPG, inaccurate quantification, condensation after gasification, gasification Sampling problems such as process pipeline adsorption are the main reason for the poor repeatability of LPG data results

According to literature reports, the sulfur content will be attenuated by 20% within 2 hours and nearly 50% in 4 hours, so it is difficult to guarantee the authenticity and validity of the data by directly using the gas valve to inject gas.

When injecting and quantify

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