Automatic oil tank water draining system

Abstract

The invention aims at solving the problem that an existing water draining system is low in detection accuracy, poor in reliability, complicated in structure, difficult to use and maintain and the like. The technical scheme is that an automatic oil tank water draining system comprises an oil tank, a detecting unit, a control unit and an execution unit. The detecting unit comprises an upper oil-water interface detector, a lower oil-water interface detector and an in-water oil content analyzer. The upper oil-water interface detector and the lower oil-water interface detector are installed in the oil tank obliquely, and the in-water oil content analyzer is connected with the oil tank through a discharging pipe. A valve is installed on the pipe. The upper oil-water interface detector, the lower oil-water interface detector and the in-water oil content analyzer form a double-meter joint control structure. Temperature sensors are installed at the detecting point ends of the upper oil-water interface detector, the lower oil-water interface detector and the in-water oil content analyzer. The upper oil-water interface detector, the lower oil-water interface detector and the in-water oil content analyzer are provided with backwashing devices and spot sampling devices, and measuring probes are coated with anti-hanging coatings.

Description

technical field [0001] The invention relates to an automatic water cutting system for an oil tank. Background technique [0002] In the early 1980s, the mechanical water cutting system based on the density method was mainly used abroad. This method has a simple structure, but the disadvantage is that the precision is low, and the floating ball is easy to stick in the tank, which is not suitable for viscous crude oil. The detection accuracy of ultrasonic method and relative density method has been improved, but the reliability and maintainability have not improved. The ray method uses the difference in the linear absorption coefficient of gamma rays between oil and water to detect oil and water content, but the absorption coefficient of oil and water is only 20% different, so the measurement accuracy is not high, and there are ray radiation, high cost, difficult use and maintenance, etc. question. These methods have been almost eliminated, and foreign oil fields have basica...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: for the existing mechanical water cutting system based on the density method, the accuracy is low, and the float ball is easy to stick in the tank, which is not suitable for viscous crude oil; the relative density method of the ultrasonic method has a limited detection accuracy. It has been improved, but the reliability and maintainability have not improved; the ray method uses the difference in the linear absorption coefficient of oil and water to gamma rays to detect the oil and water content, but the absorption coefficient of oil and water to rays is only 20%, so the measurement accuracy is not high , and there are problems such as ray radiation, high cost, and difficulty in use and maintenance

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