Double-stage cascade refrigeration method used for oil-gas recovery

Abstract

The invention discloses a double-stage cascade refrigeration method used for oil-gas recovery. The method adopts a double-stage cascade refrigeration system to provide cold energy for an oil-gas condenser step by step, wherein the cascade refrigeration system consists of two double-stage compression refrigeration cycles; and an oil-gas condenser with a higher level evaporating temperature is arranged on the cascade refrigeration system under an intermediate pressure of the double-stage compression refrigeration cycles to ensure that the oil gas is condensed step by step according to the temperature level. The double-stage cascade refrigeration method used for the oil-gas recovery has the advantages of not only being beneficial for reducing the manufacturing cost of equipment and the system energy consumption, but also providing convenience for adjusting condensation loads at each different temperature segment according to the different component distribution of the oil gas.

Description

technical field [0001] The invention relates to a cascade refrigeration method for recovering oil and gas, which is used for condensation and recovery of vapors of volatile substances such as gasoline. Background technique [0002] With the rapid development of the economy, the consumption of refined oil in my country has increased sharply, and the number and scale of oil depots and gas stations have also increased accordingly. Gasoline and other oil products contain a large amount of light hydrocarbon components with low boiling point and strong volatility. During storage and transportation, some light hydrocarbon components vaporize and escape into the atmosphere, where they mix with air to form oil and gas. The volatilization of light hydrocarbons causes serious oil evaporation loss, and a large amount of oil and gas are directly discharged into the atmosphere, which brings serious safety hazards and environmental pollution. Therefore, it is of great significance to recov...

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Problems solved by technology

[0004] In the refrigeration method of the existing condensation oil vapor recovery equipment, since multiple oil vapor condensers with different temperatures are required, a separate refrigeration system is usually installed for each oil vapor condenser, so the oil vapor recovery system needs to be equipped with multiple sets of refrigeration systems Cooling, the system is relatively large, and the manufacturing and operating costs are high

Moreover, in order to meet the oil and gas emission concentration stipulated by the state, the final stage of the oil and gas condenser needs to reach a low temperature of -110°C. Generally, a triple-cascade refrigeration system is used to provide cooling capacity for it. The triple-cascade refrigeration system is more complicated and consumes more energy.

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