差压式液位测量系统中的平衡容器及误差分析

来源期刊：冶金自动化2011年第2期

论文作者：陆建华

文章页码：60 - 65

关键词：液位； 测量； 平衡容器； 补偿

Key words：liquid level； measurement； equilibrium container； compensation

摘    要：差压式液位测量系统中,普遍采用了平衡容器。针对平衡容器能否或缺以及使用不同形式的平衡容器对液位测量精度的影响问题,具体分析了几种不同工况下的误差情况。提出了对容器中容易积聚凝结液、压力波动不剧烈的液位采用差压方式测量时可不必安装平衡容器;对锅炉汽包等高温介质的液位进行测量时,可运用DCS等智能化设备,通过软件对其测量液位进行温度或压力补偿,从而取消传统双室平衡容器或补偿式平衡容器的建议。

Abstract: Equilibrium container is generally adopted in differential-pressure type liquid level measuring system.In order to find out influence of equilibrium container on level measuring accuracy,errors under different working conditions were analyzed.For stable liquid level where condensation is easy to gather,when differential-pressure type measuring system is used to measure the level,there is no need to install equilibrium container.When liquid level of high temperature medium,such as boiler drum,is measured,it is suggested that traditional double-chamber equilibrium container or compensation type equilibrium container can be eliminated,and DCS etc.intelligent equipment and software can be used to achieve temperature or pressure compensation in level measurement.