Liquid phase separation method for liquid impurity in liquefied gas

Abstract

The invention relates to a method for separating liquid impurities from liquefied gas. The method comprises the following steps: gas phase liquefied gas, from which impurities are to be separated, is compressed and injected into a condenser for cooling and liquefaction; the liquefied gas after liquefaction is injected into a subcooler for being further cooled into pure liquid state; the liquefiedgas in the pure liquid state is introduced into a separator for prefractionation; the super-cooling liquefied gas after the prefractionation is introduced into a storage tank for settlement, wherein the storage tank can lead the liquefied gas to be in natural temperature graded distribution with high temperature at the top and low temperature at the bottom; and the liquid impurities settled at the bottom are introduced into a sewage storage device, and the separation of liquid impurities is realized. The method of the invention has the advantages of reasonable process and good separating effect. In addition, the storage tank can lead the liquefied gas to be in the natural temperature graded distribution with high temperature at the top and low temperature at the bottom, so as to be favorable for the settlement separation of liquid impurities in the liquefied gas.

Description

A liquid phase separation method for liquid impurities in liquefied gas Technical field: The invention relates to a method for separating liquid impurities in liquefied gas, especially a method for liquid phase separation. Background technique: For liquefied gas, even a small amount of impurities will have a great impact under certain working conditions. For example, in a refrigeration system, the lubricating oil in liquid ammonia will accumulate in the low-temperature evaporation section, which will seriously affect heat transfer and reduce The working efficiency of the system causes serious waste of electric energy. For this purpose the impurities in the liquefied gas must be separated. At present, the known separation technologies for liquid impurities in liquefied gases include washing, centrifugal, packing and filtering methods. Several combinations implement separation. From the state of the separation medium, it can be divided into gas phase separation and liquid...

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Problems solved by technology

When the liquid is separated, one is the vapor-liquid equilibrium state of evaporation and condensation due to the saturated state, and there is an equilibrium process of continuous vaporization of the liquid phase and continuous condensation of the gas phase, especially the existence of bottom gasification, which will generate violent bubble disturbances and promote liquefaction The mechanical mixing of gas medium and liquid impurities reduces the separation effect; second, the gasification of the liquid surface reduces the temperature of the liquid near the surface, making its density increase and causing a downward movement, which in turn produces internal circulation disturbances of the liquid, which also affects impurities Sedimentation

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