The issue of yield under reduced pressure!
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The vacuum level at the bottom of the reactor is -94 kPa; the exit temperature of the vacuum heating furnace is 390 degrees Celsius. The distillation volume at 500 degrees Celsius remains above 15 ml. How can this value be reduced further? I’m asking all the sea friends for their help; thank you so much! ! !
Continue to increase the vacuum level to 97 KPa; for wet-type systems, a slight increase in steam injection can be applied.
Teacher, the vacuum level is already at its maximum capacity. The negative pressure difference between the top and bottom of the tower is 50 Kpa. What could be the reason for this?
1】Reduce the vacuum level in the vacuum distillation tower； 2】Increase the inlet temperature of the vacuum distillation tower (the vacuum stripping temperature to be 400°C) ； 3】Steam is injected at the bottom of the vacuum tower to change the partial pressure of oil and gas ；
The vacuum level cannot be increased; if it’s necessary to reduce the temperature at the bottom of the tower by 500 degrees, then only a partial reduction is possible. Do not increase the temperature at the outlet of the heating furnace if the vacuum level does not decrease, as there is a risk of coking. Additionally, the tower pressure drop is relatively high; it might be due to slight coking of the packing. It’s necessary to determine which section of the packing is affected, with a focus on the lowest layer of packing. Check whether the amount of cleaning oil used is appropriate – more oil should be applied if needed. For the wet type, a bit more steam can be added.
Thank you, teacher! I’m very glad to receive your guidance. If the filler cokes, how should one check for that? Are there any ways to address the coking issue during production? Do you mean the cleaning oil referred to as the reflux fluid that’s below the reduction unit? In our tank, there is oil present, but it’s very difficult to get that oil to flow downward, so it’s not useful.
Thank you, teacher. But what is the reason for such a high pressure drop in the pressure reduction tower?
Is the oil too heavy, with too much asphalt?
The oil and gas partial pressures are low; analyze by reducing the distillation range. If there are many light components, increase the steam injection volume
Excessive backflow, coking of the packing, and an unsuitable design of the packing itself can all lead to an increase in pressure drop
Thank you. Things were fine during previous startups; I’m not sure what caused the issue this time – it might be coking of the packing