Abstract
The exhaust steam heat of steam driven feed pump small steam turbine is considerable in modern coal-fired power generating unit, most of which is adopted the way of wet cooling through the condenser as same as main steam turbine for condensing steam turbine unit, all the waste heat with it is taken away by circulating cooling water and not used effectively. This paper will propose the way of part of exhausted steam of small steam turbine recycled to the regenerative extraction steam system to heat condensate based on steam ejector heat pump, so as to use the exhausted steam effectively and analyze the thermal economic index of different schemes by using equivalent enthalpy drop method. The results show that it produces best economic benefits when exit steam of steam ejector heat pump is recycled to steam extraction of the fourth section.
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