| 摘要 |
<p>The invention is particularly concerned with controlling the two stage regeneration temperatures of the RCC residual oil cracking unit below 760°C (1400°F) by effecting a first stage regeneration with direct injection of water (38) in an oxygen lean atmosphere (32) to product CO rich flue gases under temperature conditions restricted not to substantially exceed 732°C (1350°F) preferably less than 732°C (1350°F) thereby partially regenerating the catalyst (28). The partially regenerated catalyst is withdrawn and directly cooled with boiler feed water to produce steam in an external catalyst cooler (48) before passing the catalyst to a second stage catalyst regeneration (50) for contact with an oxygen rich atmosphere (56) restricted not to exceed 760°C (1400°F) and preferably maintain less than 760°C (1400°F). The catalyst regenerated by this technique comprising residual coke less than 0.25 wt% is passed to a riser conversion zone (2,10,4) for catalytic cracking residual oil feeds.</p> |
