Method for preventing condensation blocking of liquid level meter at bottom of heavy alkyl benzene fractionation tower

Abstract

The invention belongs to the technical field of chemical equipment, and relates to a method for preventing condensation blocking of a liquid level meter at the bottom of a fractionation tower. The method for preventing condensation blocking of the liquid level meter at the bottom of the heavy alkyl benzene fractionation tower is characterized in that a pipeline is leaded from a pump outlet in thebottom of the heavy alkyl benzene fractionation tower, and connected to leading pressing pipeline outlet of the liquid level meter at the bottom of the heavy alkyl benzene fractionation tower; a material of the bottom of a high temperature tower returns to a liquid level pipeline at the bottom of the tower through the pipeline in a small flow to perform backwashing. The method for preventing condensation blocking of the liquid level meter at the bottom of the heavy alkyl benzene fractionation tower has the advantages that a radioactive liquid level meter is not used, the inconvenience of the radioactive liquid level meter during the operation, maintenance and management is avoided, the panic of an operator about radioactive materials is reduced, and a device is changed slightly, so that the cost is almost not increased.

Description

technical field [0001] The invention belongs to the technical field of chemical equipment, and relates to a method for preventing condensation and plugging of a liquid level gauge at the bottom of a fractionation tower. Background technique [0002] The design purpose of the heavy alkylbenzene fractionation tower is to further separate the light and heavy materials from the heavy alkylbenzene, which is the material from the previous process section. The process flow is roughly as follows: The material---heavy alkylbenzene comes from the bottom of the alkylbenzene reboiler tower and enters the heavy alkylbenzene fractionation tower. The designed operating pressure of the tower is 1.0 kPa (absolute). The non-condensable gas at the top of the heavy alkylbenzene fractionation tower is sent to the previous process section; the material in the oil sump at the top of the tower is pumped out into three parts, one part passes back to the top of the rectification section as heat reflu...

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Problems solved by technology

[0005] The object of the present invention is to provide a method for preventing condensation and plugging of the liquid level gauge at the bottom of the tower. In the case of not using a radioactive liquid level gauge at the bottom of the heavy alkyl benzene tower, the method uses a relatively simple transformation method to increase the concentration of the heavy alkyl benzene. The temperature of the inlet of the displacer type liquid level gauge at the bottom of the benzene tower, so that the heavy alkylbenzene material in the displacer type liquid level gauge does not condense, thereby solving the problem of clogging of the displacer type liquid level gauge

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