Device and method for coal tar steam debenzolization

Abstract

The invention discloses a device for coal tar steam debenzolization. The device comprises a steam tower, and a benzene washing tower, a tar heat exchanger, a tar heater, a debenzolization tower and adebenzolization tar cooler which are sequentially connected through pipelines. The output end of the debenzolization tar cooler is provided with a debenzolization tar collecting tank connected with the debenzolization tar cooler through a pipeline; the output end of the tar heater is respectively provided with a rich oil regenerator and a flash tank which are connected with the tar heater throughpipelines; the output end of the steam tower is respectively connected with input end pipelines of the tar heater, the debenzolization tower and the rich oil regenerator; the output end of the rich oil regenerator is provided with a regenerated tar collecting tank connected with the rich oil regenerator through a pipeline; the beneficial effects of the device are that atmospheric pollution causedby release of harmful gas and risks of oil leakage, ignition and tempering explosion in the heating process are avoided, the temperature of high-pressure steam heating is stable, polymerization reaction of unsaturated compounds in rich oil at high temperature is prevented from being accelerated to accelerate deterioration of circulating washing oil, the efficiency of washing benzene with rich oilis improved, and consumption of washing oil is reduced.

Description

technical field [0001] The invention belongs to the technical field of coal coking, more specifically, the invention relates to a device and method for steam debenzene removal of coal tar. Background technique [0002] Crude benzene is an important chemical raw material and one of the main products of coking enterprises. The traditional production of coking crude benzene usually uses tube furnaces to heat coal tar and low-pressure steam. In actual production, it is found that tube furnaces are used for heating. In terms of environmental protection, tube furnace heating will produce CO2, CO, Harmful gases such as NOx and SOx have the risk of air pollution; in terms of safety, there are risks of oil leakage, ignition, backfire and explosion during the heating process of the tube furnace. The internal temperature can reach above 700°C. Due to the long-term circulation of rich oil at high temperature, the polymerization rate of unsaturated compounds in coal tar will be accelera...

AI Technical Summary

Problems solved by technology

The traditional coking crude benzene production usually uses tube furnaces to heat coal tar and low-pressure steam. In actual production, it is found that tube furnaces are used for heating. In terms of environmental protection, tube furnace heating will produce CO2, CO, Harmful gases such as NOx and SOx have the risk of air pollution; in terms of safety, there are risks of oil leakage, ignition, tempering and explosion during the heating process of the tube furnace. The internal temperature can reach above 700°C. Due to the long-term circulation of rich oil at high temperature, the polymerization rate of unsaturated compounds in coal tar is accelerated at high temperature, which accelerates the deterioration of oil washing, affects the efficiency of benzene washing and increases the consumption of washing oil.

Images