Separation system for reducing vapor-liquid entrainment of vapor phase tube of debenzolization tower

Abstract

The invention discloses a separation system for reducing vapor-liquid entrainment of a vapor phase pipe of a debenzolization tower. The separation system for reducing the vapor-liquid entrainment of the vapor phase pipe of the debenzolization tower comprises a liquid sealing pipe and a liquid sealing discharge pipe, wherein the liquid sealing pipe is formed by connecting three straight pipes and two U-shaped elbow pipes and arranged below a vapor phase inlet main pipe, and the bottom end of one lower elbow pipe and the vapor phase inlet main pipe are located on the same level line. An upper end opening of the liquid sealing pipe is connected with the lower end of a vertical pipe of the vapor phase inlet main pipe, and a lower end opening of the liquid sealing pipe is connected on a vapor phase outlet main pipe. The liquid sealing height of the liquid sealing pipe is H, wherein H=U / rho * g, in the formula, U is pressure of crude benzene steam, rho is the density factor of the crude benzene steam, and g is acceleration of gravity. The upper end of the liquid sealing discharge pipe is connected with the lower end of the lower elbow pipe of the liquid sealing pipe, and the lower end of the liquid sealing discharge pipe is connected on a water discharge pipe at the bottom of a crude benzene separation groove. By means of the separation system for reducing the vapor-liquid entrainment of the vapor phase pipe of the debenzolization tower, vapor and liquid in the crude benzene steam escaping from the debenzolization tower can be effectively separated, liquid phase entrainment in a crude benzene vapor phase is greatly reduced after separation, and erosion corrosion of an inlet pipe of an oil-gas heat exchanger and erosion corrosion of a body of the oil-gas heat exchanger are lightened.

Description

technical field [0001] The invention relates to the field of gas purification, in particular to a separation system for reducing vapor-liquid entrainment in vapor phase tubes of a debenzene tower. Background technique [0002] During the refining process of raw coke oven gas, the benzene substances in the gas are first absorbed by washing oil to form benzene-rich oil, and then the rich oil is sent to the crude benzene distillation unit, and superheated steam is passed into the bottom of the benzene removal tower , the crude benzene in the rich oil is distilled out by steam distillation, since the boiling point of the crude benzene in the rich oil is lower than that of the washing oil, when the rich oil is heated to a certain temperature, the crude benzene is evaporated out, making the washing oil Oil and crude benzene are separated; the crude benzene vapor-water mixture that escapes from the top of the debenzene tower exchanges heat with cold rich oil and cooling water respe...

AI Technical Summary

Problems solved by technology

In this case, due to the vapor-liquid entrainment and partial flow in the crude benzene vapor escaping from the top of the debenzene tower 1, the inlet pipe and the body part of the first group of heat exchangers 31 will be corroded after long-term use. Leakage of crude benzene vapor

Seriously affect the safe operation of production, and cause potential danger to the surrounding environment of the device and daily personnel inspection

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