Oil gas recovery device

Abstract

The invention provides an oil gas recovery device. The device comprises an absorption system, a condensation system, an adsorption system and a desorption system, wherein the absorption system comprises an absorption tower, a compressor and an oil storage tank; the oil storage tank communicates with the top of the absorption tower and a liquid inlet of the liquid ring compressor through an oil pump; an exhaust port of the liquid ring compressor communicates with an air inlet of the absorption tower; the bottom of the absorption tower communicates with an oil collection tank; the condensation system comprises a first heat exchanger, a first gas-liquid separator, a second gas-liquid separator, a third gas-liquid separator and a cascade refrigerating unit; liquid outlets of the first gas-liquid separator, the second gas-liquid separator and the third gas-liquid separator are communicated with the oil collecting tank; the adsorption system comprises an adsorption tower communicated with agas outlet of the third gas-liquid separator; the desorption system comprises a liquid ring vacuum pump, and a gas outlet of the liquid ring vacuum pump is communicated with the oil collecting tank. According to the device, C2 and C3 molecules can be condensed, liquefied and recovered without cryogenic treatment, so that milligram (mg / m<3>) level emission of non-methane total hydrocarbon values isachieved, the oil gas recovery rate is high, and the whole device is safe, stable, efficient and energy-saving in operation.

Description

technical field [0001] The invention relates to the technical field of oil and gas recovery, in particular to an oil and gas recovery device. Background technique [0002] During the process of oil extraction, transportation, storage, transfer, processing and crude oil processing products (hydrocarbons, alcohols, benzene, etc.) . [0003] Oil and gas escape into the atmosphere, causing evaporation loss of oil products, which not only causes waste of resources, but also brings potential safety hazards and environmental hazards. [0004] Since the explosion limit of oil and gas is 1% to 6% (volume), the concentration of oil and gas around the escaped oil and gas facilities can easily reach the explosion limit, and the high concentration of oil and gas gathered near the ground has brought great disaster risks to enterprises and consumers , Explosion accidents are prone to occur in the oil unloading area and the oil sending area. [0005] In addition, oil and gas are one of V...

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Problems solved by technology

[0003] Oil and gas escape into the atmosphere, causing evaporation loss of oil products, which not only causes waste of resources, but also brings safety hazards and environmental hazards

[0004] Since the explosion limit of oil and gas is 1% to 6% (volume), the concentration of oil and gas around the escaped oil and gas facilities can easily reach the explosion limit, and the high concentration of oil and gas gathered near the ground has brought great disaster risks to enterprises and consumers , Explosion accidents are prone to occur in the oil unloading area and oil sending area

[0005] In addition, oil and gas are one of VOCs gases, and VOCs are the precursors for ozone production, so oil and gas emissions will cause serious environmental pollution

①Most VOCs are toxic, foul-smelling, and some have carcinogenic effects, and when several toxic substances coexist in the atmosphere, the harm caused is much greater due to the additive effect of toxicity

For oil and gas containing light hydrocarbon components below C3, the refrigeration unit needs to achieve cryogenic condensation at -110°C, resulting in an increase in the condensation load of the low-temperature stage, a significant increase in unit energy consumption, and an increase in failure rate

On the other hand, in the combined process of "condensation + adsorption", since C2 is not easy to condense at -70°C, C2 molecules will circulate and accumulate in the entire system, which will eventually lead to excessive emissions

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