Super heated steam
Super heated steam
(OP)
How is superheated steam produced after the steam generator? does it pass through a heat exchanger? If so what is used as the heateing matierial in a nuclear plant?
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RE: Super heated steam
RE: Super heated steam
I don't know what Allis is makeing now, not reactors or tractors either.
RE: Super heated steam
After the steam generators have created the steam, it passes through a series of moisture separators to dry the steam before going to the high pressure turbine. Some of this main steam is bled off and passed through moisture separator-reheaters(MSRs). The steam that has passed through the high pressure turbine then travels to the shell side of the MSRs where it is reheated and again passes through a series of chevron dryers to remove any moisture before going to the low-pressure turbines. Steam is extracted at various stages of each turbine for feedwater heating.
RE: Super heated steam
A most succinct and accurate reply. Well done!
Patricia Lougheed
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RE: Super heated steam
for light water PWR's the steam generators are well mixed and use a steam head on top of the primary U-tubes.
Candu Heavy water reactors circulate water which turns into a water-steam mixture inside the reactor traveling through tubes and is separated in an external steam head. The same method was used for the RBMK (in Russia) and other graphite moderated reactors in the US.
BWR, the steam head is incorporated into the top of the reactor of course.
The one exception was the Babcox and Wilcox units. The water to steam loop flowed upward through a once through steam generator, while on the primary side the high pressure reactor water flowed downwards, result 50 to 100 degrees of superheat, the turbine plant still used moisture separator re-heaters on the low pressure turbine feed, but less steam was needed for the reheat and the high pressure turbine had less water to contend with.
The downside of this design was there less water inside the steam generator which provided less of a heat sink during plant upsets. Three Mile Island was one of the few plants of this design and the lack of a large heat sink contributed to the plant's unit II demise.
Also the feed water needed to be very clean or else scale would build up in the steam generator
Hydrae
RE: Super heated steam
The nuclear steam side of the cycle was saturated, but the HP main steam was superheated in a seperately fired superheater.