Molten salt heat storage for 800C

[asimpson]

Can anyone recommend a molten salt for heat storage working temp of 800C, 1740F. Nothing too exotic or environmentally risky.

Also how to work out heat storage capacity.


Many thanks

 

[Compositepro]

Sodium chloride has a melting point of 801C. Google heat capacity.

 

[berkshire]

Check out this salt bath table.
B.E.

 

[asimpson]

Very interesting.

I wonder how would contain a molten bath of NaCl at 800C? Would stainless steel do?

Thanks

 

[IRstuff]

Molten salt is used in some nuclear reactors:

http://en.wikipedia.org/wiki/Molten_salt_reactor

TTFN
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[EdStainless]

If the salt is dry it is non-corrosive.
If you want to design this you need to consider the min and max temps.
You don't really want it to solidify at the cold end. Turn to slush yes, but not solid.
Sodium Nitrate has been used in some solar/thermal sites. They build every thing out of 1.5% Cr steel tubing.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

 

[davefitz]

For such a high temperature, and considering the corrosion and reactivity of salts, it might be useful to consider fluidized solid particles as a means of heat transport in lieu of the salt. It is routinely used today for such a purpose in CFB circulating fluidized beds at about 700 C, and the heat transfer to the superheater in the cyclone solid's dripleg is an example of its use as a heat transfer medium. No issues as far as corrosion as long as one keeps the mixture in an oxidizing state, but eroison is an issue wif sand or limestone is used as the solid media. Other meida could be used to lower the erosion potential.

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