Feasibility Study on 1 000 MW New Generation Ultra-supercritical Unit with Double Re-heating Cycles at 630 ℃

  Introduction  The feasibility study of a 2×1 000 MW new generation ultra-supercritical unit with double re-heating cycles in a power plant in coastal areas is completed to promote the development of 1 000 MW new generation ultra-supercritical unit with double re-heating cycles at 630 ℃.

  Method  The aspects of the main equipment parameters, specifications for main equipment, feasibility for main equipment, feasibility for auxiliary equipment, main system configuration, unit economy and thermal economy were analysized.

  Result  The results show that 1 000 MW new generation ultra-supercritical unit with double re-heating cycles is feasible, which can be applied in our country. Compared with 1 000 MW ultra-supercritical unit with double re-heating cycles, 1 000 MW new generation ultra-supercritical unit with double re-heating cycles has a higher thermal efficiency, a lesser pollutant emissions, and a better economic profit. The 1 000 MW new generation ultra-supercritical unit with double re-heating cycles has a 48.72% thermal efficiency, a 252.48 g/kWh gross coal consumption rate and a 260.16 g/kWh net coal consumption rate, and is best in China.

  Conclusion  Advanced martensitic heat-resistant steel G115 with independent intellectual property rights in China and extraction back pressure feed water pump steam turbine with a small generator can be used in 1 000 MW new generation ultra-supercritical unit with double re-heating cycles.