FCC steam pressure issue
Thread Content
Why cannot the FCC low-pressure steam pressure be lower than 0.6 Mpa (the reaction must be stopped if the pressure falls below this level)? Why? I hope to receive guidance from all the teachers. Thank you!
Too low pressure, first, makes it easy for water to be carried in, and second, it fails to meet the requirements of steam for nozzle atomization, pre-heating steam in the riser, stripping steam in the stripping section, anti-coking steam in the settler, as well as in other applications where steam is used as a loosening medium.
Medium pressure can be used to supplement low pressure. What feed to cut
The pressure can be maintained by using an externally saturated steam stream along with 10 kilograms of steam; emphasis should be placed on enhancing dehydration at the low points. Do not cut off the feed easily, as the consequences of doing so are no less severe than those resulting from low steam pressure.
The pressure can be maintained by using an externally saturated steam stream along with 10 kilograms of steam; emphasis should be placed on enhancing dehydration at the low points. Do not cut off the feed easily, as the consequences of doing so are no less severe than those resulting from low steam pressure.
I think the low pressure of 0.6 Mpa mentioned on the first floor refers to the pressure after low-pressure compensation in medium-pressure systems; to clarify this further, information on the steam operation of the equipment is needed.
In addition to the reasons mentioned by everyone, another factor is that insufficient driving force can cause the fluidization to stop!
There’s no need for such high pressure to cut off the feed. The original lift pipe nozzles required high pressure; when the steam pressure is low, the crude oil tends to flow back into the steam pipeline