Upgnading the unit parameters and applying double-reheat technology are effective measures to reduce the gross coal consumption rate and realize energy conservation and emission reduction. Up to now

several doublereheat units with high parameters have been put into operation in China. Summing up the technical development and operation experiences of these units is of great significance to further upgrading the parameters of the coal-fired units and developing more efficient double-reheat units. This paper introduces the development of double-reheat technology at home and abroad

it focuses on the operation situation and existing problems of the double reheat units in Huaneng Anyuan Power Plant

Guodian Taizhou Power Plant and Huaneng Laiwu Power Plant. Combing with present technology development for clean coal-fired power units

the development direction and key technologies of China's ultra supercritical double-reheat turbine units were discussed. It points out that

in the future

the double-reheat turbine technology will definitely develop towards the direction of higher parameters

lower back pressure

more flexible operation and fully national production.