Moisture content index of coking raw materials
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Ask colleagues in delayed coking equipment for advice: How much should the moisture content index of the residual oil feeding device be controlled? Is it necessary to strictly control it? Personally, I think furnace tube coking can be prevented by injecting water and steam to control the flow rate. The water content index does not need to be strictly controlled, right?
During the start-up process, the moisture content index of the residual oil is 1%, which is qualified, but after the normal start-up, the analysis and laboratory indicators are trace indicators. Too much water will easily vaporize quickly in the fractionating tower, causing tower flushing. Water injection into the heating furnace and water-containing residual oil are two different things, because water injection into the heating furnace enters the coke tower.
The moisture content index of the residual oil is 0.5%, which is considered qualified. The water content of the residual oil mainly affects not the heating furnace but the fractionation tower and the raw material buffer tank, preventing the residual oil from boiling in the raw material buffer tank and causing the fractionation tower to flush, the top pressure of the fractionation tower to be extremely high, or the safety valve to trip.