A method and device for treating coking tail gas

Abstract

The invention discloses a coking tail gas treating method and device. The method includes the following steps that storage tanks storing coking tail gas are closed or sealed through nitrogen filling;the coking tail gas of the storage tanks is charged into a buffering tank for carrying out gas-liquid separation on the coking tail gas, and is cooled and subjected to primary dewatering, naphthaleneremoving and tar removing in the buffering tank; the coking tail gas is sucked into a venture mixer for removing impurities of the coking tail gas from the buffering tank, and a hydrogenation source is introduced into the venture mixer; gas after being mixed in the venture mixer is discharged into a deoxidizing tank and subjected to catalytic hydrogenation deoxidizing; qualified coking tail gas after detection is discharged into a main gas pipe of a coking-plant gas purification system, or is discharged into a later tail gas treatment system. According to the coking tail gas treating method, the collected high-oxygen-content coking tail gas is subjected to hydrogenation deoxidizing, the oxygen content in the coking tail gas is reduced accordingly, the oxygen content in the coking tail gascan be reduced to 0.5% or below, and the coking tail gas can be directly fed into the coking-plant gas purification system and is further purified.

Description

technical field [0001] The invention belongs to the technical field of coking equipment tail gas treatment and relates to a coking tail gas treatment method and device. Background technique [0002] Coking generally refers to the process of carbonization and zooming of organic substances. In the coking plant, coking coal goes through the coking process to produce chemical products such as coke, coal tar, coke oven gas and crude benzene. The coking chemical industry only includes the coal gas purification process including condensation blast section, ammonium sulfate section, desulfurization section, debenzene section, tank farm, etc. In addition, the coking chemical industry includes tar processing, crude benzene refining, crude phenol distillation, industrial naphthalene production, asphalt Therefore, the composition of coking tail gas is very complex, except for most of it is water vapor, it also includes various macromolecular polycyclic hydrocarbons or polycyclic hydroc...

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Problems solved by technology

[0004] Existing coking plants only have a gas purification system, and there are hundreds of tail gas collection points. The properties of the materials stored in the tanks are different, the storage environment is different, the conditions of the storage tanks are different (such as tank roof corrosion and leakage), the volume of the storage tanks is different, and the exhaust gas The collection system and tail gas components are complex, and the tail gas collection process cannot ensure that the oxygen content in the tail gas is in a safe range, and the tail gas cannot be collected to the gas system for recovery; because the oxygen content in the gas is less than 0.6% according to the specification requirements, otherwise it will cause safety hazards, and at the same time It will cause frequent tripping of the electric tar catcher, which will affect normal production. The collection of exhaust gas and sending it to subsequent treatment facilities will also cause certain hidden dangers to the subsequent exhaust gas purification.

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