一、前言近代大型火电机组为了提高热力经济性,多采用中间再热系统。截至1982年底,我国已有81台中间再热机组投入运行,总容量为1308.5万千瓦,这些机组已成为我国各大电网中的主力。据统计其中约有70%的锅炉再热器调温装置不能正常使用,其中尤以国产锅炉广泛采用的烟气再循环和汽——汽热交换器的投用率更低。这就使一大批锅炉的再热汽温达不到设 First, the preface Modern large thermal power units in order to improve the thermal economy, the use of intermediate reheat system. By the end of 1982, there were already 81 middle reheat units in operation in our country, with a total capacity of 13,085,000 kilowatts. These units have become the main force in major power networks in China. According to statistics, about 70% of boiler reheater thermostat devices can not be used normally. Especially, the utilization rate of flue gas recirculation and steam-steam heat exchanger widely used in domestic boilers is lower. This makes a large number of boiler reheat steam temperature can not be set