Combination operation with a holing-extraction and press regulator is a simple and practicable way by analyzing the practical project and two way features, and it should be broadly used in practice.

Saturated steam extraction from the evaporator of heat recovery steam generator (HRSG) is often applied in various industries.

The flow field structure within the extraction slot and in the neighboring stages are depicted for various slot widths,pointing out that steam extraction causes a lasting vortex zone to appear and that the amount of steam extracted,as well as the pressure and velocity distribution along the blade s height.

The paper is about application of equivalent enthalpy drop method for the analysis economical efficiency of steam extraction and heat supply for a large-sized power plant.

Exergy of heat to power reduction ratio(namely ratio between the amount of gained exergy and lost of electric energy due to extraction of steam from turbine) was defined to characterize the extraction steam performance ,based on the exergy efficiency of chiller in cogeneration system, a comparison of different chillers performance was described.

The heat efficiency of the condensing steam turbine and the middle extraction steam turbine are analyzed by using heat economics and energy lever principles.

It can save energy sources that small-middle condensing turbines are retrofitted to extraction turbines by drilling holes or slots in their casings,but it will have effect on safety of turbines themselves.