The invention discloses a
solar energy auxiliary re-heat and back-heat thermal
power generation system. A boiler is sequentially connected with a
stream turbine, a condenser, a main circulation pump, a bleeder heater to form a main circulation circuit; a condenser mirror field focuses the sun light to a
solar energy heat absorber; the
solar energy heat absorber, a solar energy high temperature re-heater, a solar energy back-heat re-heater, a secondary circulation pump, the solar energy heat absorber are sequentially connected with to form a secondary circulation circuit; the inlet of a low pressure cylinder of the
stream turbine is sequentially connected with the solar energy high temperature re-heater and the outlet of a
high pressure cylinder of the
stream turbine to form a re-heat circuit; a re-heat extraction opening of the low pressure cylinder of the stream turbine is sequentially connected with the solar energy back-heat re-heater, the bleeder heater; the stream turbine is connected with an
electric generator. According to the solar energy auxiliary re-heat and back-heat thermal
power generation system and an emission reduction and dilatation method, by the adoption of solar energy secondary circulation, the goal of reducing
coal consumption and improving
system total power is realized through increasing re-heat field and back-heat re-heat. On a basis of taking full
advantage of the solar energy, the original
system can automatically operate and the function of utilizing the solar energy thermal storage to meet the
supply energy demand of adjusting peaks and valleys of the
system is achieved.