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A method for purifying coking tail gas

A technology of coking tail gas and condensed gas, which is applied in the direction of chemical instruments and methods, separation methods, and dispersed particle separation, can solve the problems of long process, secondary pollution of absorption solvent, and unstable absorption solvent, etc. The effect of small flow

Active Publication Date: 2017-09-12
SINOPEC NINGBO ENG +2
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Problems solved by technology

[0006] The problem to be solved by the present invention is to provide a method for purifying coking tail gas with good purification effect under low pressure in view of the current state of the prior art, so as to solve the problem of long process flow, unsatisfactory treatment effect under low pressure, unstable absorption solvent, and secondary absorption of solvent in the prior art. A series of problems such as secondary pollution

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  • A method for purifying coking tail gas

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Embodiment Construction

[0023] The present invention will be further described in detail below with reference to the embodiments of the accompanying drawings.

[0024] Using the steam ejector 3, the coking tail gas from the cold coke water and hot water tank with a temperature of 90°C to 100°C and an absolute pressure of 80KPa to 90KPa is sucked, and after being pressurized to 0.1MPa (G), it enters the condensing separator 1 . The suction power in this embodiment comes from low-pressure steam with a pressure of 0.4 MPaG to 0.6 MPaG and a temperature of 160°C to 180°C.

[0025] The coking tail gas goes to the shell side of the condensing separator and is cooled to 30 ℃ ~ 35 ℃ by the circulating cooling water in the tube side of the condensing separator. The bottom is enriched, and the liquid phase is enriched after being pressurized to 0.5MPa (G) by the condensate pump 2, and then sent back to delayed coking for further treatment.

[0026] After the coking tail gas after liquid separation comes out ...

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Abstract

The invention relates to a method for purifying coking tail gas, which is characterized in that it includes the following steps: the coking tail gas is sucked and pressurized by a steam injector and sent to a condensation separator for cooling and liquid separation, water vapor and macromolecular hydrocarbons are removed, non-condensable gas and The antifreeze methanol in the lower tower of the absorption tower is mixed and enters the liquid separation tank to separate the methanol that has absorbed sulfide and the condensate in the coking tail gas. The methanol entering from the upper part of the lower tower of the absorption tower is contacted in countercurrent, and after further removing harmful substances remaining in the non-condensable gas, it enters the upper tower of the absorption tower to remove small molecular hydrocarbons and other substances and then vents; the methanol discharged from the lower tower of the absorption tower is divided into two streams, The first strand is used as antifreeze methanol, and the second strand is mixed with fresh lean methanol as washing methanol.

Description

technical field [0001] The invention relates to a method for treating tail gas, in particular to a method for purifying coking tail gas containing a large amount of hydrocarbons and sulfides volatilized in the delayed coking cooling and coke cutting water of an oil refinery. Background technique [0002] Delayed coking technology has a simple process and is currently the most widely used residual oil processing method. The decoking technology of delayed coking in my country has reached the international advanced level, and hydraulic decoking is widely used. The delayed coking unit is usually operated intermittently, often using "One furnace and two towers" process. In this process, one tower is always in the production state, and the other is in the state of preparing cold coke, decoking or oil and gas preheating. The material in the heating furnace enters the coke tower, the oil in the tower goes to the fractionation tower, and the coke remains in the tower. After cooling ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/00B01D53/18B01D53/04
Inventor 涂林卢新军黄剑平许仁春施程亮夏兰生唐永超
Owner SINOPEC NINGBO ENG
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