What is the reason for the high fine powder content of system balancers in the catalytic cracking FDFCC process?
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In the catalytic cracking FDFCC process, the proportion of particles within the 0–40um range in the system balance agents is relatively high, accounting for 25%-30%. At the same time, compared with another heavy oil catalytic unit, under the same conditions of feedstock and catalyst, its activity is 10 points lower – what is the reason for this? If process accounting is carried out, which parameter changes should be focused on to further identify the cause? We welcome all experts to answer enthusiastically
With an analog device, it’s easier to analyze things. There’s no major issue with the raw materials, as another set is also using them; there’s no problem with the catalysts either, since another set is utilizing them as well. What remains are issues related to operation and equipment
Let me ask first: is the other set also made using the FDFCC process? The double riser process has many operational differences from conventional catalysis! Also check whether there is water carryover or excess steam in the regenerated section!
A content of the catalytic cracking equilibrium agent in the 0-40um range of generally 13%–18% is considered appropriate. A higher content in this range leads to reduced catalyst activity, and there is a risk of damage to the catalyst’s crystal structure, that is, thermal decomposition. The calculation should take into account both reaction and regeneration aspects: first, check whether the atomization steam of the feed oil is excessive, which may cause the catalyst to break down ； II. Check whether each type of steam in the reaction section contains water ； III. Change from steam cooling of burned oil mist to non-purified air cooling ； IV. Check the moisture content of the balance agent, as well as that of the freshening agent and catalyst in the balance agent tank.
First, determine whether the catalyst has been used continuously or if it has been replaced by the manufacturer. If the catalyst has not been replaced by the manufacturer, then check issues with the feed nozzle, such as the pressure drop and the solid content of the slurry, among other parameters
Is it a leak in the heat extraction tube for external heat extraction, or is it internal heat extraction?