Measuring device and method for liquid level of volatilizable variable-density medium

A liquid level measuring device and a technology of variable density, which are used in the direction of displaying liquid level indicators, signal transmission systems, instruments, etc. through pressure measurement, which can solve the problems of complicated industrial field lines and reduced system reliability.

Inactive Publication Date: 2007-05-30
ZHEJIANG UNIV
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  • Abstract
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Problems solved by technology

Third, limited by the technical conditions at that time, most of the liquid level signals use wired transmission technology, which leads to the disadvantages of complicated lines on the industrial site and a decrease in the reliability of the system.

Method used

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  • Measuring device and method for liquid level of volatilizable variable-density medium
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  • Measuring device and method for liquid level of volatilizable variable-density medium

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Embodiment Construction

[0018] As shown in Figure 1, the liquid level measurement device in the volatile variable density medium includes the pressure measurement point 1 at the top of the storage tank, the liquid phase pressure measurement point 2 in the middle of the storage tank, the pressure measurement point 3 at the bottom of the storage tank, the dry isolation tube 4, the micro Power consumption wireless transmission unit 5, first differential pressure gauge 6, second differential pressure gauge 7, PTC heating unit 8, temperature sensor 9; top pressure measuring point and dry isolation tube, PTC heating unit, temperature sensor, second differential pressure The gauge and the pressure measurement point at the bottom of the storage tank are connected, the liquid phase pressure measurement point in the middle of the storage tank is connected with the first differential pressure gauge, the micro-power consumption wireless transmission unit, and the PTC heating unit, and the micro-power consumption w...

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Abstract

The invention discloses a liquid level measuring apparatus and method in volatile variable density medium. The liquid level measuring apparatus includes tank top pressure testing point, tank intermediate liquidoid tapping point, tank bottom pressure testing point, main insulating pipe, lossless power consumption wireless transmission unit, the first differential gage, the second differential gage, PTC heating unit, temperature sensor. The invention supplies a dual-differential gage differential gage which eliminates the liquid level measuring error aroused by density fluctuations of medium to be measured; brings forward the method of main insulating pipe which eliminates the measuring error aroused by static pressure uncertainty of negative-phase pressure transmitting pipe; the lossless power consumption wireless transmission unit is powered by lithium cell, communicates with supervisor based on the ZigBee protocol(IEEE82.15.4), wireless transmission unit can realize the acquisition and processing of differential pressure signal and temperature of the main insulating pipe and the control of the PTC heating unit which is applied externally on the main insulating pipe. The battery supply and lossless power consumption wireless transmission unit makes the wiring workload of liquid level measuring apparatus reduce greatly and improve the reliability at the same time.

Description

technical field [0001] The invention relates to the technical field of medium liquid level measurement, in particular to a liquid level measurement device and method in a volatile variable density medium. Background technique [0002] Liquid level measurement has a wide range of applications, and it is characterized by the diversity of measured objects: the liquid level of crude oil, refined oil, and liquefied gas storage tanks in petrochemical enterprises, the liquid level of reaction materials in rectification towers; the reactors of synthetic ammonia, Containers in the food processing industry, as well as boilers, reservoirs, etc. require level measurement. Taking a typical 5000 cubic meter oil tank in a refinery as an example, an oil level of 1 cm is about 1 ton of oil. Therefore, accurate measurement of the liquid level has a significant impact on the inventory management and economic operation of the production plant. The basic data on which the soft sensing method is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/14G01F23/18G08C17/02
Inventor 安庆敏仲玉芳吴明光
Owner ZHEJIANG UNIV
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