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在联碱生产中,工艺介质是一种悬浮的,易结晶的液体。在压力、流量、液面的测量管道上,经常遇到管道堵塞,使测量失灵的现象,给仪表的维护工作常来了很大的困难。我们碳化塔液面的测量系统曾采用了法兰式差压变送器对碳化塔的液位进行测量,但由于结巴严重影响测量的准确,甚至无法使用,加之法兰变送器毛细管在装御中不小心也易断的缺点我们在老工人的带动下,大胆采用了吹气式液位的测量方法,取得较好的效果。一、原理:由流体静力学知,液体内某一深处的静压力P,与液面的高度成比例(在γ一定时),即 P=Hγ因此,在如图(1)的管中,吹入压缩空气后,当鼓出泡来时,测鼓包管中的压力,即反应出液面变度来。对于密闭容器,则应采用双管吹气以补偿由于气相压力的波动,造成对浓面测量的不准。
In the joint production of alkali, the process medium is a suspension, easy to crystallize the liquid. In the pressure, flow, liquid measurement pipe, often encounter pipe blockage, the phenomenon of measurement failure, to the maintenance of the instrument often come a great deal of difficulty. Our carbonization tower liquid level measurement system used a flange-type differential pressure transmitter to measure the level of the carbonation tower, but because of the serious impact of dilatation measurement accuracy, or even unusable, coupled with the flange transmitter capillaries installed Royal inadvertently also vulnerable to shortcomings We are driven by the old workers, the bold use of the inflatable liquid level measurement methods, and achieved good results. First, the principle: from the hydrostatic learned that a certain depth within the liquid static pressure P, and the height of the liquid level (at a certain time), that is P = Hγ Therefore, in Figure (1) tube , Blowing into the compressed air, when the bulging bubble, the drum test tube pressure, that is, the reaction of the liquid level to the variable. For closed vessels, a double pipe blow should be used to compensate for inaccurate measurements of rich face due to fluctuations in gas phase pressure.