What is the maximum cycle efficiency of a retrofitted steam system?
The retrofitted system has a maximum cycle efficiency of 70–80 % with low and peak modulation rates of 16.5 % and 11.7 %. Extraction of main steam dominates the peaking rate and cycling efficiency compared to extraction of reheat steam.
Can steam energy be stored in molten salt and water?
Similarly, data from power plants in Germany and Austria [14, 15] show that transferring steam energy to molten salt and water can achieve storage capacities of up to MWH, much higher than the working capacity and operating time of steam energy storage.
Does steam extraction cause boiler heat exchange surface over-temperature?
However, a large amount of main steam extraction can lead to boiler heat exchange surface over-temperature. A large amount of reheat steam extraction may lead to turbine thrust problems. None of these schemes solves the safety hazards associated with steam extraction, so they are only applicable to few CFPPs.
How efficient is a thermal energy storage system?
The condenser and evaporator corresponding to the storage and heat processes account for 60 % of the total exergy losses in thermal energy storage system. The retrofitted system has a maximum cycle efficiency of 70–80 % with low and peak modulation rates of 16.5 % and 11.7 %.
How to use heat storage method using main steam?
In general, the heat storage method using main steam requires mixing a certain percentage of water with the steam flowing through the boiler to avoid the problem (1). The reduction of the minimum power load rate after integrated the TES system is confined and varies significantly from different CFPPs.
What is the heat storage power of a TES system?
The heat storage power of the TES system during the heat charge process is 106.11 MW. During the heat discharge process, the TES system inputs energy into the CFPP with the heat discharge power of 50 MW, whereas the remaining energy stored in the TES system is equivalently transferred to the CFPP at other periods.
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