Continuous sampling and analyzing device used for loading/unloading LNG (liquefied natural gas) and using method

Abstract

The invention relates to a continuous sampling and analyzing device used for loading/unloading LNG (liquefied natural gas) and a using method, which are characterized in that the sampling and analyzing device comprises an LNG sampling probe, a gasification device, a main sampling pipeline, a BOG (boiled off gas) return device, an on-line analyzing device, a flow control device, a sample gas storage device, a sample steel bottle filling system and a control system, wherein the LNG sampling probe is connected with an inlet of the gasification device by an isolation shut-off valve and temperature detection element; an outlet of the gasification device is connected with the BOG return device by the main sampling pipeline and is also connected with the on-line analyzing device and the flow control device by the main sampling pipeline respectively; the flow control device is also connected with an inlet of the sample gas storage device; an outlet of the sample gas storage device is connected with the sample steel bottle filling system; the sample steel bottle filling system is also connected with a BOG main pipe; the isolation shut-off valve, the temperature detection element, the main sampling pipeline, the flow control device, the sample gas storage device and the sample steel bottle filling system are respectively electrically connected with the control system. The continuous sampling and analyzing device can be widely used in a facility used for analyzing an LNG component and calculating an LNG caloric value.

Description

technical field [0001] The invention relates to a continuous sampling and analysis device for LNG loading and unloading and its use method, in particular to a continuous sampling and analysis device and its use method for unloading at the wharf of an LNG receiving station, LNG tanker loading, and LNG filling station, belonging to Liquefied natural gas sampling and analysis technology field. Background technique [0002] As a safe and efficient clean energy, LNG has become one of the fastest-growing energy industries in the world. China is also paying more and more attention to the development of the LNG industry. China has put into operation and is planning LNG receiving stations covering Guangdong, Fujian, Zhejiang and Shanghai. In provinces such as , Jiangsu, Shandong, Tianjin, Liaoning and Hebei, there are more small natural gas liquefaction plants and LNG filling stations. LNG loading and unloading is an important link involved in the above-mentioned stations, mainly div...

AI Technical Summary

Problems solved by technology

[0004] The previous LNG sampling and analysis devices have the following problems: (1) A pressure reducing device or a pressure reducing regulating valve with gasification function is installed before gasification, which causes the LNG sample to gasify in advance

(2) The power of the heater is insufficient or cannot be adjusted, which cannot meet the heat demand of LNG gasification under different sampling conditions, and the gasification process is unstable, resulting in uneven gasification of LNG samples

(3) Only two links of sampling probe and vaporizer are designed, lacking the integrity design of the entire sampling device

Images