Online cleaning method of deposited salt of tower tray of normal-pressure tower

Abstract

The invention relates to an online cleaning method of deposited salt of a tower tray of a normal-pressure tower. Particularly, the method comprises the following steps that: based on the original process, a cleaning pipeline is bridged between the input end of an overhead backflow regulating valve and the output end of an electro-desalting water injection regulating valve, and is provided with a bridging valve; by temporary process of communicating the bridged cleaning pipeline and an electro-desalting water injection pump and adjustment of a series of operating parameters, the temperature from the normal-pressure tower top to the tower tray of a normal-first-line pumping section is controlled to 90-100 DEG C, the normal-pressure tower top is driven into washing water, the washing water is pumped after reaching a normal-first-line distillate outlet, hot water is used for washing the tower tray of a salt depositing section continuously so as to solve the desalting problem of the deposited salt of a tower plate of the normal-pressure tower. Since the washing temperature is maintained to be constant by controlling technological parameters and the salt solubility is larger than normaltemperature, the deposited salt of the tower tray is dissolved and washed thoroughly, the device is guaranteed not to be stopped, and the whole online salt-washing treatment process needs about 8 hours; and therefore, the online cleaning method greatly shortens the treatment time, saves cost for starting and stopping the device, and furthest reduces the influence on normal production of an enterprise.

Description

A kind of on-line cleaning method of salt accumulation on the tray of atmospheric tower technical field The invention relates to the technical field of salt deposit treatment on trays in the petrochemical industry, in particular to an on-line cleaning method for salt deposits on atmospheric tower trays. Background technique Atmospheric distillation is a processing procedure of petroleum processing. Atmospheric tower is the core equipment of atmospheric equipment and is used by every petroleum processing enterprise. With the gradual scarcity of oil resources and the increasing difficulty of mining, imported crude oil and secondary exploited crude oil have gradually increased. This part of crude oil contains salt and the amount of emulsifier increases, so it is difficult to remove it in conventional electric desalting. After the salt and emulsifier enter the atmospheric tower, it will accumulate over time and cause salt accumulation on the atmospheric tray and the stripping...

AI Technical Summary

Problems solved by technology

This treatment of salt deposits on the trays of the atmospheric tower will not only lead to loss of start-up and shutdown, prolong the processing time, but also seriously disrupt the production plan, make the production of downstream devices difficult, and bring greater economic losses

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