一、概况我国火力发电设备以煤和油为燃料。燃料的燃烧产物中含有二氧化硫或三氧化硫,其中一部分可与烟气中的水蒸汽反应生成硫酸,对金属有腐蚀作用。水和蒸汽是火力发电厂的主要工作介质。火电厂用水量很大。一台30万千瓦的发电机组,每小时得送入锅炉1000吨高度纯净的水。这些水在20—40万千卡/米~2·小时左右的传热条件下,加热变成每小时1000吨的高温高压蒸汽(温度≥550℃,压力≥170公 I. Overview China’s thermal power equipment to coal and oil as fuel. Fuel combustion products contain sulfur dioxide or sulfur trioxide, some of which can react with the steam in the flue gas to produce sulfuric acid, the metal has a corrosive effect. Water and steam are the main working medium for thermal power plants. Thermal power plants consume a lot of water. A 300,000-kilowatt generating unit sends 1,000 tons of highly pure water to the boiler every hour. The water is heated to a high temperature and high pressure of 1,000 tons per hour under the heat transfer conditions of 20-40,000 kcal / m 2 · h (temperature ≥ 550 ° C, pressure ≥ 170 cm