REACTORS. Fluidized bed reactors (FBR) are catalytic reactors in which the catalyst is fluidized within the reactor. DISADVANTAGES. The following text describes the three kinds of reactors and their advantages and disadvantages. Parr Fluidized Bed Reactors are used extensively in the chemical process industries. The distinguishing feature of a fluidized bed reactor is that the bed of solid particles or catalyst is supported by an up flow of gas.
Disadvantages of fluidized-bed devices are abrasion of the particles of solid material, entrainment of the particles by the stream of the fluidizing agent, erosion of equipment, and limited range of velocities of the fluidizing agent. Reduction and Metal Precipitation in an Inverse Fluidized Bed Reactor. Multiphase catalytic packed-bed reactors (PBRs) operate in two modes: (1) trickle operation, with a continuous gas phase and a distributed liquid phase, and the main mass transfer resistance located in the gas, and (2) bubble operation, with a distributed gas. Based on the direction of the fluid flow, PBRs can then be classified as trickle-bed reactors (TBRs) with co-current gas-liquid downflow, trickle-bed reactors with countercurrent gas-liquid flow, and packed-bubble reactors, where gas and liquid are contacted in co-current upflow. The principal advantages and disadvantages of TBR with downflow co-current operation are given below. Fluidization is a method of mixing fuel and air in a specific proportion, for obtaining combustion. A fluidized bed may be defined as the bed of solid particles behaving as a fluid.
Expanded and fluidized bed biofilm reactors (EBBRs and FBBRs) are attached-growth systems with a range of applications in aerobic, anoxic, and anaerobic biological treatment. 2.3.4. Fluidized bed gasifier 2. The fuel particles are introduced at the bottom of the reactor, very quickly mixed with the bed material and almost instantaneously heated up to the bed temperature.