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故障现象:工艺操作人员反映硫化床上三个压力点中一点指示最小值,一点指示正常值,另外一点指示最大值。请仪表工尽快进行确认。故障分析:由于硫化床内介质为硝基苯、苯胺及触媒的混合气体,容易在静止状态下结焦,所以采用“吹气法”测量压力,其压力测量系统如图1所示。当仪表工检查指示最小值的变送器时发现流量计1有流量指示,说明氢气吹气管线正常,无堵塞情况。判断为测量仪表与氢气反吹管管线交叉点前部有堵塞
Symptom: Process operators to reflect the three pressure points on the cure bed, one point indicates the minimum value, one point indicates the normal value, and the other point indicates the maximum value. Please check the instrument as soon as possible to confirm. Failure Analysis: As the media in the bed of nitrobenzene, aniline and catalyst mixed gas, easy to coking at rest, so the use of “blowing method ” to measure the pressure, the pressure measurement system shown in Figure 1. When the instrumentation to check the minimum transmitter indicated that the flow meter 1 has a flow indicator, indicating that the hydrogen gas blowing line is normal, no blockage. It is determined that there is a blockage at the intersection of the measuring instrument and the hydrogen blow-back pipe line