Process for improving washing and removing efficiency of benzene in coal gas from coal

Abstract

The invention discloses a process based on improving the efficiency of eluting benzene from coal gas. The gas from the ammonium sulfate section enters the tower from the bottom of the benzene washing tower after being cooled by a final cooling tower, and passes through the packing layer of the benzene washing tower from bottom to top. , in countercurrent contact with the circulating washing oil sprayed on the top of the tower, the benzene in the gas is absorbed by the circulating washing oil, and then leaves the benzene washing tower after being removed from the mist collection section of the tower; the washing oil passes through the oil-gas heat exchanger, rich and poor After heat exchange by the oil heat exchanger, it is heated by a tube furnace and then enters the debenzene tower, where the superheated steam from the regenerator is directly used for stripping and distillation, and the crude benzene steam escapes from the top of the debenzene tower. The washing oil is cooled by the poor-rich oil heat exchanger and then sent to the benzene washing system for recycling; the oil gas enters the oil-gas heat exchanger and the crude benzene condensation cooler, and the obtained crude benzene enters the reflux tank after the water is separated by the oil-water separator. The reflux is pumped back to the top of the debenzene tower. This process treats the contained benzene so that its content is reduced to the set safe value, which has little pollution to the environment and ensures the health of the body.

Description

technical field [0001] The invention relates to a process, in particular to a process based on improving the efficiency of eluting benzene from coal gas. Background technique [0002] Coal gas is a gas containing combustible components produced by processing coal as raw material. According to the processing method, gas properties and uses, it is divided into: water gas, semi-water gas, air gas (or producer gas) obtained from coal gasification, these gases have low calorific value, so they are collectively called low calorific value gas; coal dry distillation method The gas obtained from medium coking is called coke oven gas and blast furnace gas. It belongs to medium calorific value gas, which can be used as civil fuel in cities. Carbon monoxide and hydrogen in gas are important chemical raw materials. Coke oven gas refers to the combustible gas obtained by coking coal made of several kinds of bituminous coal, after high-temperature dry distillation in the coke oven, whil...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem that the above-mentioned existing process does not completely treat these benzene, which causes impurities when the gas is used, produces a lot of harmful substances, seriously pollutes the environment, and causes harm to people's bodies. The gas is used to elute the benzene efficiency process. This process treats the contained benzene to reduce its content to a set safe value. It is safer for people to use, has less pollution to the environment, and ensures the health of the body. It solves the problem of these benzene If the treatment is not complete, there will be impurities when the gas is used, and a lot of harmful substances will be produced, which will seriously pollute the environment and cause harm to people's bodies.