Method and device for regenerating circular wash oil during rich oil debenzolization of gas purification

Abstract

The invention discloses a process method and a device for regenerating circular wash oil during rich oil debenzolization of gas purification, which belong to the technical field of the gas purification. According to the process, regenerated wash oil is heated to be partially vaporized and enters the bottom of a distillation section of a debenzolization tower together with superheated steam, so that unvaporized residues are separated in a regeneration section of the debenzolization tower. The process is characterized in that: the regenerated wash oil discharged from the bottom of the regeneration section of the debenzolization tower is partially vaporized and regenerated in a heat exchange tube which is filled with water vapor in a heat exchanger outside a regenerator by using the heat of a crude benzene distillation tube furnace, wherein the partial vaporization of the regenerated wash oil usually can be performed in a convection section of the crude benzene distillation tube furnace.By the process, the temperature of the superheated steam of the tube furnace can be effectively reduced, the steam quantity, wash oil consumption and wastewater treatment volume can be reduced, and conditions that the residues are difficult to discharge, the regenerator cokes, and the like can be prevented. The process has the characteristics of small investment, a small amount of occupied land, energy saving, environmental friendliness, low operation cost and the like.

Description

technical field [0001] The technology belongs to the technical field of gas purification. In particular, it relates to a method and a device for recycling oil washing and regenerating oil-rich debenzene for gas purification that absorbs benzene group hydrocarbons in the gas. Background technique [0002] The conventional circulation washing oil regeneration process is as follows: [0003] like figure 1 Shown: the circulating washing oil 1 that has absorbed benzene-group hydrocarbons from the washing process, that is, the so-called rich oil, is sent to the dehydration tower 2 after heat exchange to 110-130°C. After dehydration, the circulating washing oil 1 is pumped from the bottom of the dehydration tower 2 to the crude benzene distillation tube furnace 3 . In the crude benzene distillation tube furnace 3, after being heated by the convection section 4 and the radiation section 5 of the tube furnace, it enters the debenzene tower distillation section 6 for distillation a...

AI Technical Summary

Problems solved by technology

For this reason, in addition to being overheated in the convection section 4 of the crude benzene distillation tube furnace, the direct steam often needs to be overheated in the radiant section 5 of the tube furnace, which requires a higher heat load of the tube furnace and a higher process energy. consumption

[0008] At the same time, due to the large amount of direct steam consumed by atmospheric distillation, the process has problems such as high operating costs and a large amount of oily sewage treatment.

Images