Liquid nitrogen low-temperature condensation VOC recovery treatment device

Abstract

A liquid nitrogen low-temperature condensation VOC recovery treatment device includes a liquid nitrogen storage tank, a cold preservation box, a booster fan, a gas-liquid separator, and an external transport pump. The bottom discharge port of the liquid nitrogen storage tank is connected to a cooling pipe inlet of the cold preservation box through a pipeline. A cooling pipe outlet of the cold preservation box is connected to nitrogen gas for connecting a nitrogen-sealing system; a volatile oil gas pipeline is connected to an oil gas inlet on the cold preservation box; an oil gas outlet of thecold preservation box is connected to a gas-liquid separator; a gas phase outlet of the gas-liquid separator is used for exhaustion, and a liquid phase outlet is connected to a raw material tank through the external transport pump. The device can reach 99.999% in VOC recovery percentage, can reduce the emission quantity of the volatile organic compounds and ozone layer consuming substances, can completely recover the VOC, is free of secondary pollution (waste water, NOx, acidic gas, and dioxin), is low in operation cost, is free of cleaning, allows batch operation and has great flexibility, can achieve skid-mounted design and batch processing, and is low in installation and management cost.

Description

technical field [0001] The invention relates to a process for recovery and treatment of volatile oil and gas in the process of oil and gas storage and transportation, in particular to a comprehensive treatment process for recovery of volatile oil and gas by using liquid nitrogen at low temperature to condense oil and gas. Background technique [0002] At present, the conventional technologies for oil and gas recovery in domestic petroleum industry mainly include adsorption method, absorption method, membrane separation method, condensation method and so on. Among them, the adsorption method has large losses and high operating costs. The commonly used activated carbon has the characteristics of small adsorption capacity, long adsorption equilibrium time, unsuitable for high-concentration organic gases, and difficult desorption. The condensation heat in the adsorption process is likely to cause safety hazards; absorption The method equipment takes up a lot of space, the energy...

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Problems solved by technology

[0004] In order to solve the problems of insufficient condensing cooling capacity of refrigeration compressors, low VOC recovery rate, and substandard exhaust emissions, this invention proposes to use liquid nitrogen low-temperature condensation method to recover and process volatile oil and gas, improve VOC recovery rate, and achieve zero pollution to the environment

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