MR-CE 220 Fluidised Bed Formation Teaching Equipment Fluids Engineering Experiment Equipment Description • experimental investigation of thefluidisation process • comparison of fluidised bed formation in gases and liquids • pressure loss in fixed beds andfluidised beds • optimum observation of processes through transparenttanks Bulk solids can be transformed from afixed bed into a fluidised bed when liquids or gases pass through them. Theareas of application of fluidised beds include the drying of solids and a wide variety of chemical processes. CE 220 features two transparent testtanks for fluidised bed formation in water and air. A diaphragm pump deliverswater from a storage tank into the bottom of the left side test tank. The waterflows upwards through a poroussintered-metal plate. On the sintered-metal plate is a bulk solid. If the velocity of the water is less thanthe so-called fluidisation velocity, the flowmerely passes through the fixed bed. Athigher velocities the bed is loosened tosuch an extent that individual solidparticles are suspended by the fluid. Ifthe velocity is increased further,particles are carried out of the fluidizedbed. A filter at the top of the test tankholds these particles back. The waterflows back into the storage tank. The right-side test tank is similar in construction to the left-side one. An air flowgenerated by a compressor flowsthrough it. Manometers are mounted on both testtanks to measure the pressure loss. Theflow rates are adjusted by way of valves,and can be read from flow meters. Thetest tanks are removable. This makes iteasy tochange the bulk solid filling. Glass-shot beads in a range of particlesizes are provided as the bulk solid filling. Learning objectives/experiments • fundamentals of the fluidisation of bulksolids • observation and comparison of the fluidisation process in water and air • pressure loss dependent on flow velocity • pressure loss dependent on the typeand particle size of the bulk solid • determination of the fluidisation velocity and comparison with theoreticallycalculated values (Ergun equation) • dependency of the height of the fluidised bed on the flow velocity • verification of Carman-Kozeny equation Specification [1] investigation of fluidised bed formation of solids inair and water [2] 2 transparent test tanks to observe fluidised bedformation in air/water [3] 1 manometer per tank to measure the pressureloss through each test tank [4] 1 steel rule per tank to measure the change inheight of the fluidised beds [5] both test tanks removable for filling [6] storage tank with diaphragm pump for water supply [7] diaphragm compressor with compressed air accumulator for compressed air supply [8] adjustment of flow rate for both media by valvesand flow meter Technical data 2 test tanks • length: 550mm • inside diameter: 44mm • scale division: 1mm • Material: PMMA Diaphragm pump (water) • max. flow rate: 1,7L/min • max. head: 70m Diaphragm compressor (air) • max. volumetric flow rate: 39L/min • max. pressure: 2bar Tanks • water storage tank: approx. 4L • compressed air accumulator: 2L Measuring ranges • pressure (water): 0…500mmWC • pressure (air): 0…200mmWC • flow rate (water): 0,2…2,2L/min • flow rate (air): 4…32L/min 230V, 50Hz, 1 phase 230V, 60Hz, 1 phase 120V, 60Hz, 1 phase UL/CSA optional LxWxH: 750x610x1010mm Weight: approx. 80kg Scope of delivery 1 experimental unit 1kg glass-shot beads (180…300µm) 1kg glass-shot beads (420…590µm) 1 set of instructional material
