System and process for efficiently eluting benzene hydrocarbon in coke oven gas

Abstract

The invention relates to a system and a process for efficiently eluting benzene hydrocarbon in coke oven gas, and belongs to the technical field of coking chemistry in the coking industry. The system comprises a benzene washing tower (1), a benzene removal tower (2), a tubular furnace (3), a regenerator (4), a tower top oil-water separator (5), a benzene vapor condensation cooler (6), an oil-water separator (7), a reflux column (8), a lean and rich oil heat exchanger (9), a first-section lean oil cooler (10) and a second-section lean oil cooler (11). A cold lean oil pump (20) sends cold lean oil with the benzene content of less than 0.6% and the temperature of 22-30 DEG C to the top of the benzene washing tower (1) for spraying, and the semi-rich oil pump (22) sends semi-rich oil in the oil-rich tank (12) at the bottom of the benzene washing tower to the semi-rich oil circulating washing section in the middle of the benzene washing tower (1) for spraying, so that the benzene hydrocarbon in the coke oven gas is fully absorbed. The system and process has the beneficial effects that the benzene washing lean oil circulation volume is reduced while the absorption effect of the benzene hydrocarbon in the coke oven gas is improved, so that the debenzolization energy consumption is greatly reduced.

Description

technical field [0001] The invention relates to a high-efficiency eluting system and process for benzene group hydrocarbons from coke oven gas, belonging to the technical field of coking chemistry in the coking industry. Background technique [0002] The benzene washing process in the coking industry washes and recovers the benzene group hydrocarbons in the coke oven gas to ensure the quality of the externally supplied gas reaches the standard. If the coke oven gas is not treated by eluting benzene, it will not only lose a large amount of valuable benzene group hydrocarbons and pollute the environment, but also naphthalene crystallization will block the gas transmission pipelines and facilities. For this reason, most coking plants adopt single-cycle benzene washing of coke oven gas and self-pressurized lean oil preheating rich oil elution process. The flow rate of autoclaved lean oil is slow, the inertial centrifugal force and the interference of the fixed-distance column i...

AI Technical Summary

Problems solved by technology

If the coke oven gas is not treated by eluting benzene, it will not only lose a large amount of valuable benzene group hydrocarbons, and pollute the environment, but also naphthalene crystallization will block the gas transmission pipeline and facilities

For this reason, most coking plants adopt single-cycle benzene washing of coke oven gas and self-pressurized lean oil preheating rich oil elution process. The flow rate of autoclaved lean oil is slow, the inertial centrifugal force and the interference of the fixed-distance column in the spiral heat exchange channel are small, the fluid turbulence state is small, and the heat exchange equipment and the internal resistance of the pipeline cannot be effectively overcome, and the heat exchange effect is poor. The preheating temperature of the rich oil is low, which cannot meet the temperature requirements for the debenzene distillation of the rich oil. The temperature of the rich oil can only be increased by increasing the heat load of the subsequent tube furnace. The recovery rate of benzene products is further improved

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