Of course, the leading coal thermal power plant already trying to install parabolic trough collector technology to preheat feed water heater. This option definitely save certain amount of conventional energy source. The only uncertainty for this option is availability of desired solar radiation at that location where thermal plant is located.
Ya its possible and increase the efficiency of the plant. please check this article http://www.sunquestenergy.com/applications/industrial-preheat/
Yes, this is very much possible. you can get some details in the following article published in solar energy.
Hybrid Solar and Coal-Fired Steam Power Plant Based on Air Preheating
Shimin Deng
J. Sol. Energy Eng. 136(2), 021012 (Sep 19, 2013) (7 pages)
doi:10.1115/1.4024932
Sure it is possible but I think the question should be how you want to design the system to use the maximum energy from the sun.
Sure! The project of Yazd ISCCS (Integrated Solar Combined Cycle System) is a practical model of your question. A unit of parabolic trough added to a conventional combined cycle power plant.
Technically is possible. But the economic efficiency of the Rankine-Hirn cycle will decrease while the steam extractions designed for feed water will be cancelled. So, I think that is a result of an optimisation. The cost of the heat acumulator (melted salt) will more affect the economic indicators of the plant.
Absolutely, managing your heat exchange mechanism at the exhaust will preheat the working fluid and improve efficiency.
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