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Ultra-supercritical boiler technology came out in Europe in the early 1990s. It is the most advanced coal-fired power generation technology in the world. It has the characteristics of low coal consumption, good environmental performance and high technical content. The power generation efficiency of ultra-supercritical units is 1 higher than that of the subcritical units mainly used in my country recently. 0%. 6-8% higher than the supercritical unit. In 1998, the earliest ultra-supercritical unit put into operation was installed at the Nordjyllands power plant in Denmark. It was designed and produced by the Danish BWE company. The power generation efficiency set a new world record, reaching 47%. In 2002, my country listed the development of ultra-supercritical boilers as* * 863 major project research plan. Original in 2003 * * Both the Economic and Trade Commission and the Ministry of Science and Technology have included ultra-supercritical boilers * * Major technical equipment development plan. Subcritical units and supercritical units are mainly used in power plant projects currently under construction in my country. Subcritical units are mainly domestically produced. Supercritical units mainly rely on imports. There are more than 10 supercritical units already in operation. Main operating data related to ultra-supercritical units: The average power generation efficiency of power plants currently operating in my country is below 35%. The coal consumption per unit of electricity is more than 380 grams of standard coal. The power generation efficiency of the subcritical units designed and produced in my country is about 38%. The power generation efficiency of the subcritical units designed and produced in China is about 350 grams of standard coal. The power generation efficiency of the supercritical units introduced in my country is about 41%. Coal consumption per unit of electricity is about 310 grams of standard coal. The power generation efficiency of Japanese ultra-supercritical units represented by Mitsubishi and Hitachi is about 48%. Coal consumption per unit of electricity is about 265 grams of standard coal. If ultra-supercritical technology is used to generate electricity, compared with the efficiency of the units currently operating in our country, at least 50 grams of coal can be saved per kilowatt hour. Based on the current installed capacity, 200 million tons of coal can be saved every year.