Apparatus and Process for Regenerator Mixing

摘要

Apparatus and process for increasing mixing in a regenerator. Streamlines of gas and some catalyst may form in a regenerator as a result of cyclone inlet horns positioned in the same direction. Overall mixing in the regenerator may decrease because of these streamlines. A dampening device may be used to interrupt the streamlines and increase mixing in the regenerator. The dampening device may be a baffle and direct streamlines from the outside of the chamber toward the center to collide and mix. In another embodiment, a dampening device may be a secondary disengager positioned above the disengager near the center of an upper chamber of a regenerator. The secondary disengager may be a T-disengager or may have an inverted can arrangement that may discharge gas and catalyst near the center of the upper chamber and interrupt the streamlines. In another embodiment, a dampening device may have swirl arms and may be positioned near the center of the regenerator where streamlines may enter a swirl arm and be redirected counter to the direction of flow. Such additions to a regenerator may be relatively unobtrusive, inexpensive, and simple for a retrofit or design modification and may result in an improved combustion efficiency at high rates by enhancing the lateral blending of spent and regenerated catalyst, increased lateral mixing of cool, fuel-rich and hot, O₂-rich flue gases from opposite sides of the regenerator in the dilute phase. In addition, the mean residence time of flue gas in the dilute phase may result in NO_X reduction.