What is the typical control range for the temperature difference between the dense and dilute phases in a regenerator?
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This post was last edited by akzo2008 on 2009-8-22 at 21:47. A survey was conducted regarding the temperature difference between the dense and rare phases as an important parameter for determining regeneration. It would be best to clarify: is it heavy oil catalytic cracking or wax oil catalytic cracking? ； Is it parallel or coaxial? ； Please also indicate if there are burnt tanks. Hehe – is it partial regeneration or full regeneration (or oxygen-deficient regeneration, oxygen-rich regeneration)? Our unit features a temperature difference of 25 degrees between the dense and lean phases (with a total difference of 70 degrees), and it uses partial regeneration for wax oil catalytic cracking
1. Heavy oil catalytic cracking 2. Coaxial type 3. Complete regeneration, temperature difference of 5 to 10 degrees.
1. Heavy oil catalysis. 2. Parallel format. 3. Repeated incomplete regeneration temperature difference: 50–70. The temperature difference for complete regeneration twice: not more than 10 degrees.
This post was last edited by zzh030972 on 2009-8-23 21:41. We use heavy oil catalytic cracking with coaxial complete regeneration; under normal conditions, the temperature difference is between 5 and 10 degrees. Recently, the dense-phase temperature is 685, the dilute-phase temperature is 650, and the oxygen content is fine, around 4. Could someone please explain the specific reasons for the temperature difference between the dense and sparse phases? Is the temperature of oxygen-enriched regenerated dilute phase generally higher than that of the dense phase? How high is considered normal? Is the temperature of the dilute phase generally lower than that of the dense phase in oxygen-deficient regeneration? If the temperature of the dilute phase is higher than that of the dense phase, is it secondary combustion?
Coaxial degassing performs well, and generally the temperature difference between the dense and dilute phases is smaller. However, if a negative temperature difference occurs, it may indicate burning or the formation of carbon deposits I can’t say anything without seeing the specific figures
1. Heavy oil catalytic cracking 2. High and low parallel configuration with a post-mounted coking tank 3. Repeated oxygen-depleted regeneration, with a temperature difference of 10 degrees between the dilute and dense phases; repeated oxygen-enriched regeneration, with a temperature difference of 20 degrees between the dilute and dense phases.
In the coaxial type, the temperature difference between the dense and sparse phases is generally more than 5 degrees. If the dilute-phase temperature is similar to or lower than the dense-phase temperature, it is considered a carbon pile. Collect the regenerating agent and observe its color.
If the temperatures of the dense and sparse phases are similar, or if there is only a slight temperature difference, can it still be called a carbon pile?
We experience repeated overlapping of stages 1 and 2, repeated oxygen deficiency, repeated oxygen enrichment, charring, as well as repeated temperature differences between the dense and sparse phases ranging from -20 to -30.
1. Heavy oil catalytic cracking FDFCC 2. Coaxial type 3. Oxygen-enriched complete regeneration, with a temperature difference of around 20 degrees.
The coaxial type is designed in Luoyang; it has a good internal distributor, resulting in little difference in temperature between the dense and sparse areas. If the catalyst to be regenerated distributor is not good, certain points in a certain layer of the dilute phase will have high temperatures, resulting in an uneven temperature distribution across the cross-section; this may not affect the regeneration process, provided that the temperatures at multiple points in the dilute phase are higher than those in the dense phase. Is the residence time insufficient, and does it need to be increased? Generally, an excellent condition is achieved when the temperature difference between the dense and dilute phases in complete regeneration is less than 20 degrees. If the local temperature is very high, it definitely indicates local afterburning, meaning that there is excess oxygen or CO escaping from the bed.