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我国200MW再热机组普遍采用高、中压缸联合启动,但存在着启动时间长、耗油量大的问题。针对这一问题,秦岭电厂通过多次试验,提出了“中压缸冲转中速预暖”的启动方式即利用邻炉蒸汽对中压缸进汽冲转,高压缸预暖,进行中速暖机,提高了高中压缸金属温度水平,改善了高中压缸之间的膨胀,改变了再热汽温滞后的现象,改善了电网调度的灵活性并且可将机组启动时间从12小时缩短成6～7小时,甚至5小时,每次启动用油从90吨减少到40～50吨,甚至30吨,每次启动可多发电100多万千瓦时。因此,在电力紧张,燃油十分紧缺的今天,该启动方式具有重要的经济意义。
China 200MW reheat units generally use high and medium pressure cylinder combined start, but there is a long start-up, fuel consumption problems. In response to this problem, Qinling Power Plant put forward the starting mode of “medium-pressure cylinder to medium-speed preheating” through several tests, that is, the use of adjacent furnace steam to the intermediate pressure cylinder into the steam, high pressure cylinder preheating, Warm up, raise the temperature level of high school metal cylinder, improve the expansion between high and medium pressure cylinder, change the phenomenon of reheat steam temperature lag, improve the dispatching flexibility of power grid and shorten the unit startup time from 12 hours to 6 to 7 hours, or even 5 hours, each start to reduce the oil from 90 tons to 40 to 50 tons, or even 30 tons, each start can generate more than 100 million kilowatt hours. Therefore, in the power shortage, fuel shortage today, the start-up mode has important economic significance.