Pressurizing multi-grade condensation type oil gas recycling method

Abstract

The invention discloses a pressurizing multi-grade condensation method for recycling oil gas. An air compressor is used for pressurizing the oil gas; cold quantity needed by each grade is provided for a pressurizing oil gas cooler through air cooling heat exchangers and a three-grade overlapping type refrigeration system. The pressurized oil gas passes through the air cooling heat exchangers and then is divided into two paths to be subjected to heat exchange with two heat exchangers which are arranged in parallel to recycle the cold quantity in liquid-state oil and tail gas respectively; then the oil gas sequentially passes through cooling heat exchangers of 2 DEG C, -30 DEG C and -80 DEG C, and the liquid-state oil and the tail gas are condensed and separated grade by grade. The tail gas is throttled to normal pressure before being exhausted to an atmospheric layer, and is subjected to heat exchange with the oil gas from the cooling heat exchangers to recycle the cold quantity again. The method disclosed by the invention has the three advantages that the water removing rate and the oil gas recycling rate can be easily improved after pressure is improved; the two parallel heat exchangers can be used for improving a heat transferring temperature difference and the cold quantity in the liquid-state oil and the tail gas is recycled to the greatest extent; the air cooling heat exchangers also can be used as overlapped refrigerating cycle condensers, so that a refrigerating system is relatively compact and efficient.

Description

technical field [0001] The invention relates to the field of oil and gas recovery, in particular to a pressurized multi-stage condensation recovery method for recovering volatile oil and gas mixtures. Background technique [0002] With the rapid development of China's economy, oil consumption is increasing year by year. Petroleum and its products are a mixture of various hydrocarbons, of which the light hydrocarbon components are highly volatile. During the entire process of oil exploitation, refining, storage, transportation, sales and application, due to the Due to the limitations of technology and equipment, some oil and gas will inevitably be volatilized and discharged into the atmosphere, which not only causes serious oil evaporation loss, but also brings safety hazards and environmental pollution. [0003] Problems such as waste of resources, environmental pollution, and potential safety hazards caused by direct oil and gas emissions have drawn increasing attention. ...

AI Technical Summary

Problems solved by technology

On the other hand, in the existing pressurized condensation oil gas recovery process, the oil gas from the air compressor directly enters the cooling separator after exchanging heat with the exhaust gas. At this time, the oil gas temperature is still higher than 70°C and directly enters the cooling separator. Separators can cause their load to be too high

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