Process for lyophilization and heavy hydrocarbon removal of petroleum natural gas

Abstract

The invention relates to a method for lyophilisation and heavy hydrocarbon-free of petrogenic natural gas, which is used for purification treatment of petrogenic natural gas. The method consists of inputting wet petrogenic natural gas into heat regenerator to exchange heat with cold dry gas, afterwards evaporating the raw gases in evaporator, in which the cooled raw gases pass through the vapor-liquid separator with an evaporator installed inside it and the refrigerating unit provides the cooling medium, condensing and separating the water and clean oil in them, eventually reaching a good purification treatment effect for lyophilisation and heavy hydrocarbon-free of petrogenic natural gas. The invention has advantages that the adopted plants are of simple process flow, small investment and good purification effect, which can solve gelation problem that produced by traditional freezing method in which the temperature reduces below the freezing method and has acquired good purification effect for oil gas.

Description

Technical field: [0001] The invention relates to a process method for purification and treatment of petroleum and natural gas in an oil and gas gathering and transportation station in an oil field, which belongs to the category of petroleum and natural gas gathering and transportation treatment technology. Background technique: [0002] Petroleum and natural gas (referred to as petroleum gas) often contains water above the dew point temperature and a small amount of heavy hydrocarbons with a low boiling point before being treated by a recovery device. %, during the transportation process in winter, as the gas temperature drops, water and light oil will naturally condense, which will easily cause safety accidents such as pipeline freezing and equipment flameout or deflagration. In order to prevent safety accidents, oil and gas pipelines in cold regions usually adopt pretreatment methods such as secondary or multiple heating and adding antifreeze. Although the above-mentioned...

AI Technical Summary

Problems solved by technology

The adsorption method is a method of removing moisture from natural gas by using solid (molecular sieve) or liquid (methanol, ethylene glycol, etc.) adsorbents. The former has the advantages of complete dehydration and high purity, but it consumes a lot of energy and is complicated to operate, requiring heating and regeneration , plus the requirement of fire separation distance, the device occupies a large area, so it is usually only used for light hydrocarbon recovery devices; the latter is not completely dehydrated, pollutes seriously, and consumes a lot of materials. It is generally used as a winter natural gas pipeline or equipment for freezing emergency measures

Although the traditional direct freezing dehydration method can remove part of the water in petroleum gas, but the freezing problem caused by the operating temperature dropping below the freezing point needs to be solved by cycle switching, so the cost is high and the effect is poor

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