Liquefied natural gas sampling and continuous collecting device

Abstract

The invention discloses a liquefied natural gas sampling and continuous collecting device, which comprises a sampling system, a gasification system, an on-line analysis system and a continuous collecting system, wherein the sampling system comprises an LNG sampling probe, a sampling pipeline and an LNG filling pipeline; a closed deep cooling cavity is formed at the front end of the LNG sampling probe; the sampling pipeline is arranged in the LNG sampling probe in a penetrating manner; the LNG filling pipeline is arranged in the LNG sampling probe in a penetrating mode and communicates with a closed deep cooling cavity; one end of the sampling pipeline penetrates through the closed deep cooling cavity and is connected to the gasification system; the gasification system is used for gasifyingan LNG sample conveyed by the sampling pipeline; the on-line analysis system is connected to an outlet of the gasification system and is used for carrying out on-line analysis on a gasified natural gas sample and providing gas component parameters; and the continuous collecting system is connected to the outlet of the gasification system and is used for continuously collecting the gasified natural gas samples.

Description

technical field [0001] The invention relates to a liquefied natural gas sampling and continuous collection device, which is used in conjunction with a gas chromatographic analyzer for natural gas, and can be used for LNG component analysis (finally providing calorific value) such as LNG receiving station wharf trade transfer, LNG tank car loading measurement, etc. The application occasion belongs to the technical field of LNG sampling and analysis. Background technique [0002] Since LNG is an ultra-low temperature liquid mixture (usually the operating temperature is below -130 degrees Celsius), and it is very easy to gasify, the liquid is prone to rapid fractionation and gasification of components under the influence of slight temperature and pressure changes, and real gasification can be obtained before gasification. It is very difficult to obtain a flowing LNG sample that can represent the liquid mixture ratio in the pipeline. For this reason, the LNG sample must be kept...

AI Technical Summary

Problems solved by technology

However, most of the existing collection devices use a single pressure vessel design, which has the problem of sample mixing and uneven filling.

Or use a pressure vessel design with mechanical parts, which is prone to problems such as friction jamming of moving parts, non-uniform sampling or air leakage

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