A rotor placed inside or outside of a stator in the radius direction includes a fixed rotor fixed in a position along a rotation axis of the rotor, and a movable rotor allowed to approachseparate from the fixed rotor and to move in a direction along the rotation axis. The exchanger is divided into a high temperature part and a low temperature part, mutually interconnected with an interconnecting tube of hot gas. The methods provide appropriate mechanisms of stopping feed to the reactor and unloading catalyst to protect against loss of catalytic activity that can occur due to contact with water molecules. In addition, a flow edge is provided on the radially inner surface of each guide vane. The ADC has a second-level resultant FDLE, which is coupled to receive and combine the outputs of the first-level FDLEs to provide a digital value indicative of the magnitude of the input signal. A differential is positioned between the axle half-shafts and a dual planetary gear set is positioned between and interconnects each axle half-shaft to the differential.