Condensed type benzene recycling system of coking plant and condensed type benzene recycling method

Abstract

The invention discloses a condensed type benzene recycling system of a coking plant and a condensed type benzene recycling method. The recycling system comprises a benzene gas compression device, a refrigeration device and a benzene liquid storage tank, wherein the benzene gas compression device comprises a centrifugal compressor, a control cabinet and a gas storage tank; the refrigeration device comprises a screw rod type refrigeration compressor, an oil separator, a water cooling condenser, an electronic expansion valve and a shell-pipe type evaporator; a gas suction valve of the centrifugal compressor is connected with a gas outlet of benzene gas to be recycled; a gas exhausting valve of the centrifugal compressor is connected with a gas inlet of the gas storage tank; a gas outlet of the gas storage tank is connected with the gas inlet of the shell-pipe type evaporator; and a liquid outlet of the shell-pipe type evaporator is connected with the benzene liquid storage tank. Compared with the prior art, the condensed type benzene recycling system has the advantages that the benzene gas pressure is improved to 0.4MPa and then the benzene gas is condensed so that the condensation temperature is improved to -25 DEG C from -60 DEG C; and the structure of the refrigeration device is simplified, the initial cost and the operation cost of a recycling system are reduced, and the recycling rate of the benzene gas is increased.

Description

technical field [0001] The invention relates to a condensation-type benzene recovery system of a coking plant and a recovery method thereof, belonging to the technical field of liquefaction of benzene gas. Background technique [0002] Coking plants have recycling workshops, and the main recyclable is benzene, which was recovered by benzene washing tower in the early stage, and recovered by condensation blast method in the later stage. At present, normal pressure condensation is basically used. Due to the low concentration of benzene in the recovered gas, the refrigerator in the recovery system needs to provide a low temperature of -60°C to realize the liquefaction of benzene in the recovered gas, which has the problems of low energy efficiency and high system operating costs. The Chinese patent application with the application number 201410499320.6 "A Benzene Organic Vapor Recovery Device and Its Recovery Method" provides a low-temperature condensation at -30°C, and then th...

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Problems solved by technology

At present, normal pressure condensation is basically used. Due to the low concentration of benzene in the recovered gas, the refrigerator in the recovery system needs to provide a low temperature of -60°C to realize the liquefaction of benzene in the recovered gas, which has the problems of low energy efficiency and high system operating costs.

The Chinese patent application with the application number 201410499320.6 "A Benzene Organic Vapor Recovery Device and Its Recovery Method" provides a low-temperature condensation at -30°C, and then through temperature swing adsorption and pressure swing adsorption to improve the recovery rate of benzene, but There are also problems such as high equipment cost and low recovery efficiency

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