An Automatic Density Correction Method in Liquid Level Measurement of Floating Roof Storage Tank

Abstract

The invention provides an automatic density correction method in the liquid level measurement of a floating roof storage tank. According to the structural characteristics of the storage tank with a floating roof, the floating roof contacts the stopper during the rising process of the liquid level or the falling process of the liquid level according to the pressure measurement. When there is a sudden change in pressure, the liquid density calculation and floating roof gravity calculation are performed by calculating the pressure measurement value at the moment when the sudden change occurs and the pressure sudden change value, so as to realize the automatic correction of the liquid density in the storage tank and the automatic compensation for the influence of the weight of the floating roof , so as to give the corrected calculation formula of the liquid level of the storage tank. Adapt to the weight change caused by floating roof adsorption or crystallization during the working process of the floating roof, and improve the accuracy of liquid level measurement. Especially in the case of large fluctuations in medium density, it can meet the requirements of accurate measurement of the liquid level, improve the application range and adaptability of the storage tank, and thus improve the use efficiency of the storage tank.

Description

technical field [0001] The invention relates to the technical field of heat exchange control, in particular to an automatic density correction method in liquid level measurement of a floating roof storage tank. Background technique [0002] In the industrial fields of petrochemical, chemical and coal chemical industries, there are often liquids in some storage tanks that are volatile and produce toxic gases that are released into the air, causing environmental pollution and waste. An effective measure is to adopt the floating roof method. Design the storage tank. However, there are problems in liquid level measurement in storage tanks with floating roofs. The main reason is that the floating roof and the side wall of the storage tank are sealed. It is very difficult to measure the liquid level with other methods. Once the seal of the floating roof is damaged, it will cause the diffusion of toxic gases. environment. Nowadays, the pressure method is generally used for measur...

AI Technical Summary

Problems solved by technology

However, there are problems in liquid level measurement in storage tanks with floating roofs. The main reason is that the floating roof and the side wall of the storage tank are sealed. It is very difficult to measure the liquid level with other methods. Once the seal of the floating roof is damaged, it will cause the diffusion of toxic gases. surroundings

Nowadays, the pressure method is generally used for measurement. Since the weight of the floating roof cannot be accurately given due to adsorption or crystallization, the accuracy of liquid level measurement is very poor, especially when the liquid level of the storage tank is lower than the stopper. According to conventional calculations There is an essential error in the liquid level measurement of the method, and the accurate liquid level cannot be given

In addition, the density fluctuation of the liquid in the storage tank directly affects the accuracy of the liquid level measurement using the pressure method.

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