Device for sampling and gasifying liquid-phase medium

Abstract

The invention discloses a device for sampling and gasifying a liquid-phase medium, and the device comprises a sampling unit which comprises a sampling probe and is used for collecting the liquid-phase medium; a first gasification unit which is used for gasifying the liquid-phase medium collected by the sampling unit; and a throttling unit which is arranged on a first pipeline for connecting the sampling unit and the first gasification unit, and is configured to adjust the flow of the liquid-phase medium entering the first gasification unit and enable the liquid-phase medium entering the first gasification unit to have enough supercooling degree based on decompression gasification. By arranging the throttling unit, on one hand, the throttling unit is used for adjusting the flow of a liquid-phase medium entering the first gasification unit so as to adapt to the thermal load change of the first gasification unit; on the other hand, a small part of the liquid-phase medium is gasified under reduced pressure before entering the first gasification unit, and the gasified part of the liquid-phase medium absorbs heat, so that the supercooling degree of the residual liquid-phase medium is increased, and fractionation of the liquid-phase medium before entering the first gasification unit for gasification is effectively avoided.

Description

[0001] The present invention claims the priority of the patent application whose application date is July 8, 2020 and whose application number is CN202010652011.3, the contents of which are incorporated in this application by reference. technical field [0002] The invention generally relates to the technical field of liquid sampling and gasification, in particular to a device for sampling and gasifying low-temperature liquid medium. Background technique [0003] Mediums in liquid phase at low temperature, such as LNG, LPG and other low-temperature liquid phase media, need to be converted into gas phase when sampling and analyzing, so as to facilitate their analysis. Since the low-temperature liquid medium often contains a variety of components with different boiling points, when it is heated or decompressed and vaporized, the components with different boiling points will be converted into gas phases in time or in the order of boiling points from low to high, resulting in Fr...

AI Technical Summary

Problems solved by technology

In the prior art, in order to avoid the measurement deviation caused by the time-divided gasification of the distillation range, a homogenization vessel with a volume of more than 20L is often used, resulting in poor real-time analysis of components

[0005] Among them, the gasifier is one of the key components for changing the liquid phase medium into a gas phase. The gasifier in the prior art uses the change of the cross-sectional area to control the pressure of the fluid to make the fluid reach a supercritical state. It does not consider the heat of the heating body. Inertia, it is difficult to realize the working state of sealing and heating the liquid-phase sample injection to the critical state and releasing it, and it is difficult to apply it in actual operation

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