SiC, not Ti-gr1, for HX in ZLD crystallizer or evaporator?
SiC, not Ti-gr1, for HX in ZLD crystallizer or evaporator?
(OP)
Is anyone familiar withthe use of silicon carbide SiC as the material for the heat exchanger plates or tubes in ZLD crystallizers and evaporators?
The cost of Ti-Gr1 seems prohibitive, while the thermal conductivity of SiC is 7 times that of Ti, and it has better anti corrosion behavior.
The cost of Ti-Gr1 seems prohibitive, while the thermal conductivity of SiC is 7 times that of Ti, and it has better anti corrosion behavior.





RE: SiC, not Ti-gr1, for HX in ZLD crystallizer or evaporator?
Ti tubing is selling for about 45$/kg, there are a lot of common alloys that more expensive.
We have supplied tubing for crystallizers in both AL-6XN and SEA-CURE. The use a super stainless steel is largely dependent on the pH of the system. High pH is good application for SEA-CURE.
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Plymouth Tube
RE: SiC, not Ti-gr1, for HX in ZLD crystallizer or evaporator?
pH in evaps and crystallizers is normally corrected up over 8.5, so perhaps SeaCure may be an alternative, although, the pH of teh bulk mixture may not be the governing parameter if crevice corrosion yields a local pH below 7.
It may be that the reason that SiC is used in europe for FGD components is the acidic pH in the FGD slurry.
RE: SiC, not Ti-gr1, for HX in ZLD crystallizer or evaporator?
Yes, if this is aggressive enough that an alloyed Ti grade or special Ni alloy is needed then the cost may be above that of SiC. But I still find that hard to believe.
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Plymouth Tube
RE: SiC, not Ti-gr1, for HX in ZLD crystallizer or evaporator?
the ZLD crystallizers and evaporators operatoe at a high pH, over 8.5 , in general.
RE: SiC, not Ti-gr1, for HX in ZLD crystallizer or evaporator?
Materials selection is very touch for these.
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Plymouth Tube