Mobile-type tail-gas treatment device and method

Abstract

The invention relates to a mobile-type tail-gas treatment process and device. The mobile-type tail-gas treatment device mainly comprises a condensation heat exchanger, a three-phase separator, membrane separation assembly, a vacuum pump, a heat exchanger, a catalytic oxidation reactor, a blower, an air supplement machine, a vortex flow meter, a concentration monitor, a fire barrier, a vacuum meter, and valves. According to the invention, through the heat exchanger and the three-phase separator, residual moisture is condensed, partial organics are dissolved in an oil phase for direct recovery, uncondensed and unabsorbed tail gases enter the membrane separation assembly, after separation is performed by the membrane separation assembly, the pollutant concentration of tail gases in the retentate side of the membrane separation assembly is reduced, discharging is directly performed after a standard is reached, dense gases at the permeate side of the membrane separation assembly are subjected to a low-temperature catalytic oxidation reaction, and discharging is directly performed after the treated dense gases reach the standard. The mobile-type tail-gas treatment process and device solve the pollution problems caused by discharge, and protect atmospheric environments.

Description

technical field [0001] The invention relates to a tail gas treatment process and device, which is mainly applied to the in-situ treatment of nitrogen tail gas in the process of shutdown and maintenance of refining and chemical enterprises. Background technique [0002] With the improvement of the country's economic level and the transformation of people's ideas, the environmental protection indicators of oil refining and chemical enterprises (refining and chemical enterprises) have been continuously improved. The tail gas emissions of refining and chemical enterprises are divided into two types: organized emissions and unorganized emissions. Among them, during the shutdown and maintenance process of refining and chemical equipment and storage equipment, nitrogen replacement (nitrogen purging) is required, and a large amount of purge steam (tail gas) is generated during nitrogen replacement. Due to the large variation of exhaust emissions, the complex composition of pollutan...

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Problems solved by technology

[0005] The adsorption method (patent number CN201210334393.0) can recover pollutants, and its process mostly uses activated carbon adsorption technology, but the adsorption capacity of activated carbon is limited, and the adsorption process releases heat, and there are hidden dangers in the adsorption of high-concentration tail gas, which is not suitable for application in refining and chemical enterprises

Although the membrane separation method (patent number 200820178507.6) has the advantages of low operating cost, modular components, mild operation process, and good safety, it also has the problem that the pollutants cannot be recycled, and the retentate gas requires other technologies. deal with

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