Based on a volume expanding evaporative steam generation system and a 600 MW coal-fired power plant

a solar hybrid coal-fired power generation system was established.Moreover

the variable condition calculation model and techno-economic evaluation model for this hybrid system were built up

to analyze the thermodynamic and technology economy performance of the solar system

steam turbine and solar hybrid coal-fired power generation system.The results show that

the solar hybrid coal-fired power generation system has a significant energy saving effect

it is most obvious to replace the first extraction steam.The indexes of the solar system are generally in declining trend

when the solar steam replace from the 1st extraction steam to the 8th

the efficiency of solar energy to electrical energy conversion is up to 23.5%.The steam consumption rate and coal consumption rates were in a rising trend

the cycle thermal efficiency of the power generation systems is nearly 10%.In addition

the cost of electricity is nearly the same from each integrated mode

around 0.19yuan/(kW·h).Considering the net present value(NPV)

replacing the first stage extraction steam is a better choice

but replacing the second stage extraction steam is better if considering the net present value ratio and profitability.The results may provide guidances for the application of solar hybrid coal-fired power generation system.