Novel online automatic water washing device

Abstract

The invention discloses a novel online automatic water washing device, which comprises an electric-dewatering and electric-desalting tank body, a backwash water inlet pipe, a water washing distribution pipe, a crude oil water injection pipe, a crude oil inlet and a drain outlet, wherein a backwash collecting pipe and a section washing pipe are arranged at the bottom of the tank body in a longitudinal length direction; a water washing pump controlled by an automatic control system is arranged outside the electric-dewatering and electric-desalting tank body; and the backwash collecting pipe is arranged on the lower part of the backwash water inlet pipe, is 15 to 25cm away from the bottom of the tank body and has a width of 40 to 60cm so as to prevent silt from being mixed into an inlet pipe of the water washing pump to abrade the water washing pump. A water outlet pipe of the water washing pump can be divided into one or more unequal section flushing pipes according to the size of the tank body, and flushing time can be set respectively. A backwash system is connected with an interface controller to perform integrally automatic control, so that the stability of an oil-water interface in the electric-dewatering and electric-desalting tank body is ensured in the backwash process, the desalting and dewatering efficiency of the tank body is improved, and the silt is timely and effectively drained out of the tank body through the drain outlet. Therefore, the aim of water washing is fulfilled.

Description

technical field [0001] The invention relates to a novel on-line automatic water flushing device, belonging to the field of chemical machinery, in particular to an on-line automatic water flushing device suitable for electric dehydration of crude oil in oil fields or refineries, and sediment deposited in electric desalter tanks. Background technique [0002] Crude oil dehydration and desalination is a very important unit operation in front of petroleum refining, especially in today's energy shortage in China, in order to improve the efficiency of petroleum refining and reduce the corrosion of crude oil on equipment, dehydration and desalination of crude oil is becoming more and more important. [0003] In the process of oil extraction, crude oil contains a large amount of water and sediment when extracted from the ground. Different oil fields, different oil regions and even different oil wells have different water and sediment contents in the crude oil produced. [0004] In t...

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Problems solved by technology

Because, during the water flushing, the crude oil water injection should be stopped, which leads to the instability of the oil-water interface in the tank, and the most direct result of the instability is the reduction of the desalination and dehydration efficiency, and even endangers the stability of the electric desalination and electric dehydration equipment in severe cases. operation; secondly, the waste of flushing water for each water flushing is serious, and the manual operation is intensive. In line with the principle of improving efficiency and reducing waste, this method is not the best solution

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