Oil gas separating and reclaiming system and its separating and reclaiming method

Abstract

The present invention discloses one superposing oil-gas separating and recovering system and method. The separating and recovering system includes compressor, pre-cooler, condenser, heater and membrane separator connected successively, and the outlet of the membrane separator is connected to the inlet of the compressor. The separating and recovering process includes compressing the oil-gas, cooling the compressed oil-gas to normal temperature and separate out saturated water, condensing the compressed and cooled oil-gas in the condenser to separate gasoline, heating in the heater the un-condensed oil and gas, separating in the membrane separator, returning the permeated to the inlet of the compressor and evacuating the rest gas. The present invention has the advantages of simple structure, high separating effect and low running cost, and may be used widely in various oil-gas separating fields.

Description

1. Technical field [0001] The invention relates to a gas separation and recovery system and its separation and recovery method, in particular to a cascade oil gas separation and recovery system and its separation and recovery method. 2. Background technology [0002] Fuel oil (gasoline, diesel, kerosene) is the most used transportation energy in my country and even in the world. As a commodity in circulation, fuel oil must go through multi-layer storage and transportation links in the sales process. In these links, the inevitable volatilization loss accounts for about 1% of the total oil product. These volatilization losses mainly occur in the process of sending and receiving oil products between refineries and oil depots, oil depots and gas stations, and refueling vehicles at gas stations. According to statistics, in 2003, my country had more than 16 million vehicles of various types, consuming 60 million tons of gasoline alone, "big breathing" and "small breathing" in the...

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Problems solved by technology

Although the compression condensation method and the cryogenic freezing method are relatively economical in investment, the concentration of the exhaust gas is difficult to meet the standard. If the standard must be met, the compression pressure must be very high or the refrigeration temperature must be very low. Oil Depot Emission Standards and Limits (DB11 / 206-2003) requires that the emission concentration of the treatment device should not exceed 25g / m under standard conditions 3 And the purification efficiency E should not be lower than 98%, and the refrigeration temperature of the cryogenic refrigeration method must be below -80°C, which will greatly increase the investment and operation costs, thus greatly reducing the economic benefits of the recovery device

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