Preheating temperature range for catalytic feed oil
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What are the minimum and maximum preheating temperatures for the feed oil used in heavy oil catalytic cracking (60% slag content, P: 0.925, residue: 3.0)? What are the disadvantages of being too high or too low? What is the appropriate amount of vapor for atomization? What are the disadvantages of too high or too low amounts? I hope to receive guidance from all the teachers! Thank you!
Our preheating temperature is 200~220
This post was last edited by dqkwb on 2017-4-11 at 22:03. We preheat the raw materials in our system to a temperature between 190 and 245 degrees; increasing the preheating temperature improves the atomization of the raw materials, reduces the amount of coke formed, and thus lowers the air consumption required for regeneration. Too low a preheating temperature of the feedstock leads to a high slurry-oil ratio, poor atomization of the feedstock, and an increase in coking amount; however, it is favorable for reducing the level of olefins. As for the atomized steam, it depends on the technical requirements of the nozzle you choose; generally, the ratio of atomized steam to the raw material is around 3~5%. If the linear velocity of the nozzle is too high, it will cause the catalyst to break down and increase consumption of the catalyst.
"Heavy oil for catalytic cracking (60% slag mixture, P: 0.925, residue: 3.0) – Are you trying to do some calculations? Our preheating temperature is between 200 and 225 ； Generally, the ratio of atomized steam to the raw material is around 3~8%
This post was last edited by humin on 2017-4-12 07:16. A higher preheating temperature can reduce viscosity, which is beneficial for atomization, but it affects the agent-oil ratio. The typical preheating temperature is 180–220°C, though this varies among different manufacturers and is determined based on the characteristics of the equipment. Atomized steam is also an effective means to ensure good atomization results; high-quality nozzles (such as those from UOP) are designed for 3% efficiency, while domestic nozzles generally require a efficiency of 3-5%.
The preheating temperature of the raw material is 200~220°C, the atomization ratio is 5%, and the nozzle type is BWJ-IV. The poster should note that the type of nozzle is quite important for atomization, as different types require different conditions.
Is the pressure high at your feed nozzle? The BWJ nozzle is a high-pressure nozzle
The design pressure of the BWJ nozzle is 0.5 MPa
To determine the preheating temperature, it is necessary to know the viscosity of the crude oil; the target is for its viscosity to drop below 2.0, with a value of 1.0 being even better.
The preheating temperature of the raw materials in our device is 220–250 degrees, and the atomizing steam accounts for 5% of the feed volume.
The new set we have is 180~260 degrees; the nozzle has not been determined yet.