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一、问题的提出我厂3号机炉(4号机炉)过去一直发生主蒸汽温度汽轮机侧与锅炉侧偏差较大的问题,特别是在炎热的夏天,有时竟达15～20℃之多,严重影响机炉的安全经济运行。例如79年2月至3月的一个月时间里,由于主蒸汽温度偏差较大,发生障碍事故一次,同时也增加了油耗,一般5万机组油耗按主蒸汽温度每超过规定值1℃增加万分之四来计算,我们按每天平均偏差5℃(实际有时高达15～20℃)计算,则3号机炉一个月中由于主蒸汽温度偏差增加油耗22吨左右,一年将达到240吨之多。在解决这个问题中,我们对温度变送器、测量元件、线路、表头及干扰等都进行了详细的检查,排除了上述各因素,发现镍铬—镍硅热电偶配用补偿导线测量温度时,其结点温度必须进行误
First, the issue put forward I plant No. 3 furnace (furnace No. 4) in the past has been the main steam temperature turbine side and boiler side of the larger deviation, especially in the hot summer, and sometimes as much as 15 ~ 20 ℃ as much , Seriously affecting the safe and economic operation of the furnace. For example, during the one-month period from February to March 1979, the main steam temperature deviation was larger and an obstacle accident occurred. Fuel consumption was also increased at the same time. Generally, the fuel consumption of 50,000 units increased by 1 ℃ per main steam temperature exceeding the specified value If we calculate the average deviation of 5 ℃ per day (actually sometimes as high as 15 ~ 20 ℃), the steam consumption of No.3 furnace will increase by 240 tons in one month due to the main steam temperature deviation, and will reach 240 tons a year many. In solving this problem, we conducted a detailed examination of the temperature transmitters, measuring elements, lines, meters and interferences, excluding the above factors. It was found that the Ni-Cr-NiSi thermocouple was equipped with a compensation lead for measuring the temperature When its junction temperature must be mistaken