How much catalytic pre-heating steam is appropriate?
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The devices are coaxial; what is an appropriate amount of pre-heating steam for a lift tube reactor? Are there any other parameters that can be used as a reference? What are the effects of being too high or too low on the reverse regeneration system?
Check what the design value is; the pre-heated steam pressure is too high, resulting in a too short reaction time. The catalyst is not evenly distributed, which affects the contact reaction between the catalyst and the oil, and thus impacts the distribution of the product. If it is too low, the reaction time is long and the gas yield is high; being too low may cause blockage
This post was last edited by Refiner on 2016-12-20 07:45. Doesn’t generating steam for pre-lifting serve to control the density in the pre-lifting section? We adjust the density based on reference values; when there is dry gas, it is pre-raised
All of these have designated values, so no changes are needed
It mainly depends on the density in the pre-lift section: too high a density leads to high energy consumption, large amounts of acidic water, while too low a density results in poor pre-lift efficiency and easy coking in the lift pipe
It depends on how tall you are; being a few tons taller doesn’t make much of a difference
Design is design, but it also needs to take practical considerations into account. Coaxial catalysis is an older technology, and its design isn’t that perfect yet. Ensure everything is covered.
First, consider the density of the pre-raising section; it should not be too high, otherwise the catalyst is prone to getting clogged after cycling. As for being too high, as long as it’s not excessively high, an increase in steam leads to more separated water, which reduces the partial pressure of oil and gas, resulting in a slight change in the reaction time. The same goes for dry gas!
What is the normal density of the general pre-lift section in a vertically stacked internal lift pipe?