cooling coils are introduced into the regenerator to control the temperature and remove the excess heat 在再生器中放进冷却盘管能控制温度，也能除去过多的热量。收藏
Catalyst returning to the reactor may not be completely regenerated because of insufficient time in the regenerator 因为催化剂在再生器中停留时间不足，故返回反应器的催化剂可能未被完全再生。收藏
