Rich oil debenzolization system for processing coke oven gas

Abstract

The invention provides a rich oil debenzolization system for processing coke oven gas. The rich oil debenzolization system comprises a debenzolization column, a rich-poor oil heat exchanger, a poor oil column and a regeneration column, wherein a heat-conducting oil pipe is buried in the column bottom of the debenzolization column. According to the rich oil debenzolization system, poor oil in the column bottom of the debenzolization column is indirectly heated by virtue of circulating heat-conducting oil, and an original tubular furnace is replaced, the problems that a pipeline is easily blocked when viscous poor oil flows in the pipeline and the heat exchange effect is poor are thoroughly solved; furthermore, heat-conducting oil has the characteristics of high temperature, heat exchange efficiency and safety and low pressure, so that the energy consumption of the rich oil debenzolization system can be effectively reduced; the use of heat-conducting oil can be stopped at any time in the production process, so that the problem that poor oil coking in the original tubular furnace is fundamentally solved, the temperature and the temperature stability of poor oil in the debenzolization column are improved, and the distilling effect and the product quality of the debenzolization column are improved.

Description

technical field [0001] The invention relates to the technical field of coke oven gas purification, in particular to an oil-rich debenzene system for coke oven gas treatment. Background technique [0002] Oil-rich benzene removal technology is a necessary link in the process of gas purification in the coking industry. The gas first passes through the top of the benzene washing tower in the benzene washing section to wash oil and wash benzene. After washing benzene, the washing oil absorbs a large amount of benzene in the gas. The hydrocarbons and other organic matter are called rich washing oil (referred to as rich oil). The rich oil becomes lean oil (referred to as lean oil) after being debenzene removed by the debenzene tower. Lean oil returns to the benzene washing tower to continue washing benzene. This cycle ensures the smooth operation of gas purification in the coking industry. [0003] At present, the negative pressure debenzene technology is mostly used for rich oi...

AI Technical Summary

Problems solved by technology

Since lean oil is the product of rich oil distillation and refining that absorbs benzene organic compounds, it still contains a large amount of heavy, non-volatile benzene organic compounds, resulting in higher viscosity, poor fluidity, and poor thermal conductivity of lean oil, making lean oil The oil flows slowly in the inflow and outflow pipes connecting the debenzene tower to the tube furnace and in the pipes inside the tube furnace, which often leads to blockage of the pipes, poor heat transfer effect, and low and fluctuating temperature in the debenzene tower tank Larger, which seriously affects the distillation effect and product quality of the debenzene tower

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