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上海锅炉厂412型锅炉存在着一个共同的问题是汽温偏低。例如:黄岛电厂~#1炉汽温偏低达45℃,使机组负荷只能带11万5千千瓦,热耗偏大40大卡/度;在正常运行中,汽机因蒸汽过热度不够(特别在一台吸风机停运清灰时,汽温最低降到470～480℃),经常开疏水和降负荷,严重威胁了设备的安全和经济运行。为了解决汽温偏低的重大缺陷,黄岛电厂在上海发电设备成套研究所和山东电力科试所的协助下,通过~#1炉试验分析和热力计算,确定了增加对流过热器受热面的改进方案,并于1982年7月~#1炉大修时,增加受热面481米~2,取得了良好的效果。本文以该厂两台锅炉为例,对汽温偏低的原因和其改进方案作一些分析和计算(其设计参数和结构从略),以供参考。
Shanghai Boiler Factory 412 boiler there is a common problem is the temperature is low. For example: Huangdao Power Plant ~ # 1 furnace steam temperature as low as 45 ℃, the unit load with only 115,000 kilowatts, 40 kcal / degree heat capacity is too large; in normal operation, the steam turbine overheating enough (Especially when a suction fan is deactivated and the temperature of the steam is lowered to a minimum of 470-480 ° C), frequent draining and lowering of load often seriously threaten the safety and economic operation of the equipment. In order to solve the major shortcomings of low steam temperature, Huangdao Power Plant, with the help of Shanghai Power Equipment Institute and Shandong Electric Power Bureau, through the # 1 furnace test analysis and thermal calculation, determined that increasing convection superheater heating surface Improvement program, and in July 1982 ~ # 1 furnace overhaul, heating surface increased 481 m ~ 2, and achieved good results. In this paper, two boilers in this plant are taken as an example to make some analysis and calculation on the reason of low temperature and its improvement scheme (the design parameters and structure are omitted) for reference.