The effect of sulfur in feedstock on catalytic cracking processes
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Why does the oxidation of sulfur brought in along with coke and adsorbed on the catalyst in the regenerator to form SOx increase the consumption of main air and raise energy consumption?
Originally, only carbon was burned; now sulfur is also burned, which naturally increases the amount of air used, and thus increases energy consumption...
Are you operating in oxygen-poor regeneration or oxygen-rich mode?
Seventy to eighty percent of sulfur is in coke! The coking of the raw materials is a constant value; an increase in sulfur content leads to more coking, and sulfur can also produce sulfur trioxide
Charring itself is an energy-consuming process; burning sulfur as if it were carbon increases the amount of charring. Sulfur has a lower calorific value than carbon, and the lower efficiency in energy recovery leads to increased energy consumption. It’s like spending money on eggs, but those eggs contain rotten ones; the more rotten eggs there are, the higher the average price of the eggs. Energy consumption refers to the average price; normal eggs contain carbon, while rotten eggs contain sulfur