Abstract: Many key technologies involving double cylinder, precooled tilting bearing, compact and quickly assembled and quickly disassembled ending-seals and flexible supporting structure and so on are applied in the independent research and development of high temperature, high pressure, high rotating speed, compact and quickly assembled high back pressure steam turbine. And multiple patents authorizations have been obtained. The power output of such turbine could reach to 12000 kW; the inlet pressure and temperature could reach to 14Mpa and 540℃; the rotating speed could reach to15 000 r/min and the outlet pressure could reach to 7Mpa. Until now, the total sales power of the researched and developed, compact and quickly assembled high back pressure steam turbine has reached to 6670kw; the annual electricity saving is about 5336 million kWh; the annual economic benefit is about 4268.8 million yuan (calculated as about 8000 hours of working time and about 0.8 yuan per kWh of industrial average electricity consumption). The total energy consumption of the project converted into standard coal is about 17075.2 tce (the power discount coefficient is calculated as 320 gce/kWh). The carbon reduction emission after the conversion is about 45078.528 tCO2 (carbon emission coefficient is calculated as 2.64 tCO₂/tce).

Key words: compact and quickly assembled type, high back pressure steam turbine, energy conservation