Lift with dry gas or water vapor
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Is dry gas or steam better for lifting in catalytic cracking?
Using dry gas is advantageous: 1. It allows for the savings of steam, thereby reducing energy consumption and the amount of sulfur-containing wastewater discharged； 2. Reduce the hydrothermal deactivation of high-temperature catalysts ； 3. The product distribution changes, increasing the yield of light oils while reducing the dry gas yield ； 4. Heavy metals on the passivated catalyst inhibit the dehydrogenation reaction. Disadvantage: It increases the load on the air compressor, leading to higher energy consumption.
When there is a surplus of pressure in the compressor, using dry gas for pre-lifting is better than using steam; dry gas pre-lifting can deactivate heavy metals, reduce the generation of dry gas, and at the same time decrease steam consumption and lower energy use
It mainly depends on whether your compressor has enough headroom; if so, use pre-heated dry gas