Technology and device for controlling continuous and stable discharge of non-condensable gas in benzene recovery system

Abstract

The invention relates to a process and device for controlling the continuous and stable discharge of non-condensable gas in a benzene recovery system. The benzene vapor generated at the top of the benzene removal tower enters a condensing cooler and is cooled by a low-grade cold source and a high-grade cold source in sections to obtain Benzene-water mixture; the benzene-water mixture flows into the gas-liquid mass transfer heat transfer device and flows to the lower benzene-water separator, and the gas phase in the condensing cooler enters the benzene-water separator and flows to the upper gas-liquid mass transfer heat transfer device Internal flow, the pressure inside the control system is ‑80kPa~45kPa; in the gas-liquid mass transfer heat transfer device, the gas-liquid two-phase countercurrent contact, the high-boiling organic components in the gas phase are condensed into the benzene-water separator, and the non-condensable gas is cooled Continuous and steady discharge from the top. The invention can continuously and stably discharge the non-condensable gas in the benzene recovery system, while ensuring the quality and yield of crude (light) benzene, it can eliminate the unstable factors in the operation of the benzene removal tower, and improve the safety of the benzene recovery system; and The process is simple, the equipment layout is reasonable and compact, and the installation and maintenance are convenient.

Description

technical field [0001] The invention relates to the technical field of recycling coking chemical products in the metallurgical coking industry, in particular to a process and a device for controlling the continuous and stable discharge of non-condensable gas in a benzene recovery system. Background technique [0002] At present, the production of crude (light) benzene in coking plants generally adopts the following process: the gas is washed in the benzene washing tower to remove the benzene medium, and the washing oil (rich oil) rich in benzene is obtained. After the rich oil is heated, it is sent to the degassing tower Distilled in the benzene tower, the benzene vapor distilled from the top of the tower is cooled by the condensing cooler and separated by the benzene-water separator to obtain crude (light) benzene products, and the lean oil at the bottom of the tower is sent to the benzene washing tower for recycling after cooling. The benzene vapor distilled at the top of ...

AI Technical Summary

Problems solved by technology

This process has the following problems: 1) the discharge of non-condensable gas is not smooth, and the pressure fluctuation in the debenzene tower is large, which will lead to the disorder of the debenzene tower process in serious cases, and it is difficult to guarantee the product quality; 2) when the non-condensable gas is discharged, there will be Uncondensed benzene vapor will affect the yield of crude benzene on the one hand, and easily cause safety accidents on the other hand

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