There is strong focus on environmental issues and the sustainability of coal.Improving heat efficiency of coal-fired power station can realize both energy-saving and CO2 reduction.The main target of the EU's "AD700 project" and American "Ultra supercritical steam project(USU)" was to significantly improve the heat efficiency of generator units by increasing the steam parameter up to 700 ℃

even to 760 ℃.Investigations show that

two methods can improve the heat efficiency:developing a new thermodynamic system

or narrowing the difference in heat efficiency between the actual thermodynamic system and the Carnot cycle

as well as increasing the steam parameter.Efficiency of present unit can be increased to 50% or higher if combining the 2 ways together.Based on the AD700 Project and SC Plan

China can build an E50+(efficiency higher than 50%) platform to focus on developing the key technology(except high temperature material) of advanced high-efficiency coal-fired power station

and construct demonstration power station

within a short time.