Coke Calcining
RSS Dixie has numerous products installed in coke calcining plants across the country.
The majority of coke calcining plants process petroleum coke which is then used in the primary aluminum, steel, and chemical production industries. Calcining coke involves heating the material to remove moisture and volatiles which increases the coke density and electrical conductivity. Many coke calcining plants are located next door to oil refineries for easy and constant access to petroleum coke.
The typical calcining plant consists of one or more rotary kilns, a rotary cooler, settling chamber and stack.
Typically, petroleum coke is fed into the backend of the rotary kiln. Rotary kilns are lined with refractory monolithics or brick. As the coke travels down the rotary kiln, it passes through numerous sections, some containing refractory lifters and refractory lined air injection nozzles. Rotary kilns are heated via the firing hood at the discharge end of the kiln. Abrasion, thermal shock, and temperature resistance up to 2900°F are the most important refractory property considerations.
For the rotary kiln lining, RSS Dixie supplies our pumpable, self-flowing, Dixie Crete LC-6001. The firing hood, where thermal shock is a main consideration is routinely lined with our Thermogen 85 Plastic and Dixie Crete ULC 85.
After passing through the rotary kiln, the calcined coke is discharged via a feed shoot into a rotary cooler. Thermal shock of the refractory is common as the cooler often contains a water quench to decrease the coke temperature. We routinely supply our coarse grained Dixie Crete LC 65 C for this area which provides excellent resistance to thermal shock.
The settling chamber and stack are upstream from the green coke feed. The stack in many plants is typically gunned or shotcreted. RSS Dixie can supply numerous materials for this area such as our fireclay gun mix- Dixie Gun 28 T. The settling chamber is often gunned with a 2500-2600°F, lightweight gun mix such as our Dixie Mono Kast 28 G.
