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1987年4～6月,马钢第二炼铁厂连续发生罐爆事故7次,其中1次因发现及时,采取预防措施未逐。这7次罐爆事故事先均未报警(表压比报警压低0.09一0.11MPa)。为了弄清原因,对现场进行了调查。 1.罐压超压安全报警系统 (1)D×B-113超压报警压力表的法兰变送器装在罐的上部φ100×6长80～120mm的无缝钢管的法兰上。由于该处是盲端,罐中充压后煤粉处于悬浮状态,煤粉含水0.5～2％,温度为50～70℃,天长日久,煤粉便粘结在变送器的法兰平面上,煤粉层厚达10～30mm,使表压不准,压力偏低。从而导致超压不报警。
From April to June 1987, there were seven consecutive tank explosion accidents at the No.2 Iron Masteel of Masteel, among which one was found to be timely and preventive measures were not taken. The seven cans explosion accidents were not reported before the alarm (gauge pressure alarm down 0.09 a 0.11MPa). In order to find out the reason, the scene was investigated. 1. Tank pressure over-pressure safety alarm system (1) D × B-113 over-pressure alarm pressure gauge flange transmitter installed in the upper part of the tank φ100 × 6 length 80 ~ 120mm seamless steel pipe flange. Because the place is the blind end, the pressure in the tank after the pulverized coal in suspension, coal moisture 0.5 ~ 2%, the temperature is 50 ~ 70 ℃, over time, the coal will be bonded to the transmitter flange surface, Pulverized coal layer thickness of 10 ~ 30mm, the gauge pressure is not allowed, the pressure is low. Resulting in over-pressure alarm.