THE
REFRACTORIES ENGINEER
Technical Paper
Utilising a mullite material has other intrinsic benefits compared with traditional 90s materials:-
• Comparable maximum service temperature ie. pragmatic molten point to mullite bonded corundum
• Shell temperature is maintained in the range 350-550⁰F • Lower density which correlates with a reduced footprint weight
• Lower thermal conductivity, potential for thinner linings to increase reaction capacity and no significant change to shell temperature
• Lower and linear thermal expansion; there are no peaks or troughs in the expansion curve and therefore no heterogeneous reaction to temperature swings specifically during power outages
Frimul FX Microstructure as supplied
• Excellent resistance to creep at high loads and temperature providing stable lining construction
REFERENCES
[1] US EPA Sulphur Dioxide the Basics [2] Fundamentals of Sulphur Recovery by the Claus Process:
B.Gene Goar; Steve Fenderson
[3] Ceramic and Glass Materials: Structure, Properties and Processing; D.J.Duval; S.H.Risbud;
J.F.Shackleford
Figure 7. H2 Depletion of silica leaving corundum layer at front face (2 years exposure) SUMMARY
DSF Frimul FX represents a step change in SRU lining materials exhibiting (to our knowledge) unparalleled creep resistant characteristics which are intended to not only meet but exceed the auspices of API standards and more importantly define a material with capability to withstand both normal and abnormal operating temperatures.
DSF Frimul FX is in current use as the sprung crown of an E-glass melter operating continuously at ~2912°F. The melter is oxy-fuel fired; the span is 13ft with an aggressive boron containing environment. It is new to the SRU industry, however technical due diligence has been performed and to date there have been no significant parameters which would negate the use of this material.
November 2019 Issue 17
www.irengineers.co.uk www.ireng.org
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