robert.hargraves wrote:I am confused by the thread. Is and E-M pump for Fl salts possible? Useful?
I don't think we actually know how possible or practical they'd be. I am not sure if the conductivity of the salts is known well enough to tell either way. It would be very nice if we could use them though as they should be pretty much maintenance free.
I am not sure if the conductivity of the salts is known well enough to tell either way.
There has been extensive research work done in the electrical conductivity of sodium, potassium, and lithium fluoride salts at high temperatures (1000C – 2000C) done for the aluminum smelting and refining industry. They use high electric currents to separate pure aluminum from aluminum ore at high temperatures. And many components of aluminum ore is close to LFTR salt is its composition.
At the beginning of this thread I referenced a research article on fluoride salt electric conductivity by the aluminum industry.
IMHO, EM pumps should be a top priority in LFTR design. It enables the use of double wall pipe were the core salt flows down the center of the pipe and the blanket salt surrounds it on the outside layer, see
http://www.energyfromthorium.com/forum/ ... 029#p10029
This double wall pipe configuration allows the following advantages:
The core salt heats the blanket salt to help achieve isothermal heat distribution throughout the total reactor salt volume. This makes for a very safe LFTR design.
Double walled pipe provides maximal thermal mass and inertia for the salt reaction. This is very important if we want to downsize the amount of salt to fill a very small LFTR (100mw).
The blanket salt protects the core salt from overheating or freezing, and in general minimizes rapid salt temperature fluctuations in the piping, i.e. heat flashing or cold plugs.
This double wall pipe captures all neutrons that are produce in the core salt when in circulation in the piping system effecting increased U233 production. Besides the capture of these delayed neutrons, it also reduces external reactor radiation including residual gamma radiation.
Since the pipe material: diamond, SiC, and molybdenum are paramagnetic, magnetic pumping can move both core and blanket salt in the double pipe at the same time to a common heat exchanger (see post http://www.energyfromthorium.com/forum/ ... f=3&t=1017
) thereby reducing the number of pumps and pipes required by a factor of ½.
Double wall pipe protects the core salt from leaking due to primary salt pipe wall failure.
This new LFTR design paradigm will not be recognized and seriously explored by the conservative members of the LFTR design community. The priority is to get a working LFTR out in use as opposed to providing a dominant competitive through more risky technical solution.
The old Zenith slogan: The quality goes in before the name goes on.