"Furno bets that super-efficient, modular kilns will turn the cement industry upside down."
"Calcium containing minerals, usually from limestone, are sent through the kiln, where they're heated to more than 1,110 degrees F (600 degrees C)."
"Raw materials enter one end of the kiln, which lies horizontally, and are pushed past an intense flame to the other end, where they emerge as clinker."
"Kilns today are not very efficient. A study of one in China showed that only about 30% of the heat in the kiln powered the calcination reaction; the rest was lost."
"Furno's kiln, on the other hand, is far more efficient, reducing emissions from fossil fuels by 70% or more. It accomplishes that by turning the kiln vertical, filling it with ingredients that are ground to prescribed dimensions, and then seeping through it a combustive gas (natural gas, biogas or hydrogen) and setting it ablaze."
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