Coking tail gas treatment method and coking tail gas treatment device

Abstract

The invention discloses a coking tail gas treatment method and a coking tail gas treatment device. A purpose of the invention is to solve the problems of secondary pollution and the like caused by vapor and malodorous gas pollution and tail gas VOC and coke powder discharge along with tail gas of the coke pool and the coke powder of the existing delayed coking device. According to the device, cokepool tail gas, coke tower discharge steam, coke tower tail gas and tail gas generated by other equipment in a coking device enter the gas-liquid separation section of a tail gas treatment tower and are subjected to gas-liquid separation; the gas-phase coking tail gas rises to a desulfurization section and is in countercurrent contact with an absorption liquid entering from the upper portion of the desulfurization section so as to be desulfurized; the desulfurized coking tail gas continuously rises to reach a desaturation section; after desaturation, the tail gas is discharged from the top ofthe tail gas treatment tower, VOC is removed, and then the tail gas is emptied; the rich absorption liquid is pumped out, pressurized and returned to the upper portion of the desulfurization section;after failure, the waste liquid is externally sent to a treatment unit; and the washing water containing solid particles in the tail gas treatment tower enters a settling section downwards, the washing sewage containing solid particles comes out from the bottom of the tail gas treatment tower, and the clarified washing water comes out from a washing water pumping hopper at the lower portion of thetail gas treatment tower and is pressurized so as to be recycled as circulating washing water.comes out from the top of the tail gas treatment tower, VOC is removed, and then the tail gas is emptied;the rich absorption liquid is pumped out, pressurized and returned to the upper portion of the desulfurization section; after failure, the waste liquid is sent to a treatment unit; and the washing water in the tail gas treatment tower flows out downwards from the bottom of the tail gas treatment tower, one part is discharged out of the device, and the other part is pressurized and then recycled as circulating washing water.

Description

technical field [0001] The invention belongs to the field of coking tail gas treatment in petroleum processing, and relates to a coking tail gas treatment method and device. Background technique [0002] Delayed coking process is an important residual oil processing process in petroleum processing. After the raw material is heated to about 500°C by heat exchange and coking furnace, it enters the coke tower for thermal cracking reaction and condensation reaction, and generates oil gas and solid coke in the coke tower. The oil and gas generated by the pyrolysis reaction enters the fractionation tower through the oil and gas line at the top of the coke tower, and is separated into rich gas and fractions such as naphtha, diesel oil, and wax oil. Solid coke is deposited in the coke tower and is regularly decoked to the coke pool. [0003] In the coking process, high-pressure water is usually used for drilling and coke cutting, and the cut and crushed coke blocks enter the coke ...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a coking tail gas treatment method and device to solve the problem of secondary pollution caused by water vapor, odorous gas pollution, tail gas VOC and coke powder in the coke pool and coke tower of the existing delayed coking device. And exhaust gas leakage problems in the device and other equipment

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