Diesel to slurry
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What is the purpose of the line (DN25) that runs from the diesel outlet line to the outlet of the slurry steam generator? Does anyone know and can tell me? Thank you
If this is the only diesel line connected to the slurry system, then it is a line used for flushing the slurry with diesel; diesel can be used to replace the fluid in the slurry line before performing the shutdown cleaning process, to ensure that it is thoroughly cleaned.
The viscosity of the slurry is relatively high; using diesel as a flushing fluid serves to dilute it to some extent.
It seems that the oils processed by your facility and the equipment are performing well, with no need to use wash oil fractions at all – which is truly enviable, though I’m not sure if it’s appropriate. :Lol. Also, it would be more accurate to describe it like this: there is a pipeline from the diesel outlet line leading to the slurry discharge line.....
It seems that the raw materials used in your equipment’s processing as well as the operation of the equipment itself are all in good condition; in fact, the flushing oil system has not even been used yet. It’s really enviable. Although I don’t know if it’s not supposed to be done. :Lol. Also, change the problem description to: There is a pipeline from the diesel outlet unit to the slurry discharge unit... which is easier to understand.
①The backup slurry generator tubes are filled with diesel. ②During disassembly and oil removal, diesel is used for replacement, followed by steam purging.
If diesel is to be used for flushing, then why not connect it in front of the steam generator? And what’s connected after the generator?
What does \"diesel to external discharge\" mean? My installation hasn’t started yet
This post was last edited by longziyun on 1/1/2019 at 15:40. It turns out that your facility has not yet started operations; no wonder I was unaware of it. It goes without saying that the proper operation of the slurry system is of great importance for catalytic cracking units. As the saying goes, if something is functioning properly, there’s no pain; if there’s pain, something isn’t working properly. Discharging the slurry is also a necessary measure to ensure the proper operation of the slurry system. The head of the slurry pump is not small, but the volume of slurry in circulation is large and the pipelines are quite thick. The diameter of the pipes used for discharging the slurry is relatively smaller; therefore, without affecting normal slurry circulation, the amount of slurry discharged is relatively low and the flow velocity is also slower. The slurry contains a high proportion of heavy components, has a high density and viscosity, and may also contain some coke particles and catalyst particles. Additionally, a cooling system is required to keep the temperature of the discharged slurry below 90°C (while the slurry in circulation operates at temperatures above 250°C). Further cooling and pressure reduction lead to an even greater increase in the viscosity of the discharged slurry. Moreover, the process for discharging slurry usually involves long pipelines, resulting in significant pressure drops along the way, and it is operated intermittently. All these factors affect the fluidity of the slurry being discharged. Sometimes, to ensure the unobstructed flow of the slurry transfer pipeline, a flushing oil system is activated; diesel components are used to dilute and dissolve the asphaltenes, polycyclic aromatic hydrocarbons, and organic char present in the slurry, thereby enabling successful transfer and achieving the goal of removing the heavier components from the slurry.