前言以提高电站热效率为目标,日本的电站锅炉又从汽包锅炉转向了超临界直流锅炉。目前在日本,建造用作带中间负荷、启停方便、在部分负荷运行时仍能维持高效率的变压运行超临界直流锅炉,正成为主要发展方向。以往设计的定压运行超临界直流锅炉,在启动和低负荷运行时为了使炉膛水冷壁保持高压,必须在锅炉的主蒸汽管上设置截 Preface To improve the thermal efficiency of power plants as the goal, Japan’s power plant boilers have shifted from drum boilers to supercritical once-through boilers. In Japan, it is becoming a major development direction to construct a supercritical once-through boiler to be operated as a transformer with an intermediate load, easy start-up and stoppage, and high efficiency during part-load operation. Previously designed constant pressure operation of supercritical once-through boilers, in the start-up and low load operation in order to maintain high pressure in the water wall of the furnace, you must set the main steam pipe cut