Method and system for realizing automatic water cutting and oil return by using drainage pipe of petrochemical storage tank

Abstract

The invention relates to a method and system for achieving automatic water cutting and oil return through a petrochemical storage tank water drainage pipe. In order to solve the problem of oil entrainment of water cutting equipment, an automatic water cutting tank or an automatic water cutting pipe which communicates with the lower portion of a storage tank through the water drainage pipe is used for water cutting, and when the oil concentration, detected by an oil-water detection sensor, in liquid exceeds a specified value, a water cutting control valve on a water cutting pipeline led out by the automatic water cutting tank or the water cutting pipe is closed by an intelligent controller; when water appears on the lower portion of the storage tank again, an oil return control valve on an oil return pipe enabling the automatic water cutting tank or the water cutting pipe to communicate with the storage tank is opened and an oil return pump is started by the intelligent control for oil return, or an oil return pump on an oil return pipe enabling the water cutting tank and a check valve of the storage tank is opened by the intelligent controller of water cutting equipment for oil return; when a medium, detected by the oil-water detection sensor, is water, the oil return pump is stopped, and the oil return control valve is closed, or the oil return pump is stopped, and the oil return process is completed; and water cutting is conducted after settling for a certain time or immediately. The method and system have the advantages that oil cannot adhere to the interior of the pipeline of the automatic water cutting equipment during water cutting, entrainment and adhering of oil do not exist during water cutting, and the water cutting purity degree is high.

Description

technical field [0001] The invention relates to a water cutting method for a storage tank, in particular to a method and a system for realizing automatic water cutting and oil return by utilizing the drain pipe of a petrochemical storage tank. Background technique [0002] Existing water cutting equipment for storage tanks detects water, cuts and discharges, stops cutting and discharging after detecting oil, and cuts and discharges again after detecting water. However, when oil is detected, the oil must be filled with the cutting line. Due to the viscosity of the oil, when the water sinks and the cutting line is filled with water again, the oil will still adhere to the cutting line. Since the cutting is the rapid descent of water, and the settlement is the slow replacement of oil by water sinking, these adhered oils will inevitably be taken out by the cut water during the cutting process, causing unnecessary pollution and waste. Contents of the invention [0003] The purp...

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Problems solved by technology

However, when oil is detected, the oil must be filled with the cutting line. Due to the viscosity of the oil, when the water sinks and the cutting line is filled with water again, the oil will still adhere to the cutting line. Since cutting is the rapid downward flow of water, and sedimentation is water sinking slowly to replace oil, these adhered oils will inevitably be taken out by the cut water during the cutting process, causing unnecessary pollution and waste

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