Coking exhaust gas treatment method

Abstract

The invention relates to a coking exhaust gas treatment method which is characterized by comprising the following steps: coking exhaust gas enters a condensate separator; after liquid phases are separated, the separated coking exhaust gas enters a liquid-gas jet pump and is mixed with methanol which enters the liquid-gas jet pump from a liquid phase inlet; the mixture is conveyed into a stock solution in an absorption tower; part of sulfur components and benzene series in the gas phase are washed out from the stock solution, get out in bubbles from the stock solution and are in countercurrent contact with low-temperature washing methanol which enters the absorption tower from the middle part; the sulfur components and benzene series are dissolved in washing methanol and further washed out from the coking exhaust gas; the washed waste gas enters the activated carbon packing section at the top of the absorption tower, and is adsorbed and evacuated; the stock solution in the kettle of the absorption tower is extracted by a circulating pump and divided into two streams: a first stream is conveyed for regeneration, and a second stream is further divided into two parts: a first part is mixed with lean methanol, and the mixture is used as washing methanol and enters from the middle part of the absorption tower, and the second part is conveyed into the liquid-gas jet pump, wherein the flow amount of the second part is matched with the pressure of the liquid-gas jet pump.

Description

technical field [0001] The invention relates to a method for treating coking tail gas, in particular to a method for treating coking tail gas containing a large amount of water vapor, hydrocarbons and sulfides volatilized in delayed coking cooling and cutting water of an oil refinery. Background technique [0002] At present, the decoking technology of delayed coking in my country widely adopts the method of hydraulic decoking. During the cooling and removal of coke, pollutants such as sewage, coke powder, dirty oil and waste gas will be produced, especially in the water supply cooling coke and soaking coke of the device. , During the overflow process, a large amount of sewage containing oil, sulfur, and benzene series will be produced at a temperature of about 100 ° C, followed by a large amount of organic pollutants such as sulfides and hydrocarbons volatilized at high temperatures. Exhaust gas is coking tail gas. The composition of these gases is complex, and the moisture c...

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Problems solved by technology

[0006] The problem to be solved by the present invention is to provide a coking tail gas treatment method for the existing technology to solve a series of problems in the prior art, such as low safety, high energy consumption, unstable absorption solvent, and unsatisfactory treatment results.

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