● Safe and Suitable For Unsupervised Student Operation.
● Responds Rapidly to Control Changes.
● Negligible Operating and Maintenance Costs.
● Two year Warranty.
Introduction
The HILTON H694 Fluidisation & Fluid Bed Heat Transfer Unit has been designed to provide visual and quantitative results related to the flow of air through both a packed and fluidised bed of granular material.
The Unit also provides quantitative results related to heat transfer in a fluidised bed.
The Fluidisation and Fluid Bed Heat Transfer Unit is almost silent in operation, is safe and easy to use and responds quickly to changes in operating conditions
The interesting and stimulating range of investigations which are possible with this unit make it of interest to those involved with Mechanics of Fluids, Heat Transfer and Thermodynamics in courses for
Chemical Engineers
Energy Mangers
Plant and Process Engineers
Mechanical Engineers
Mining Engineers
Experimental Capabilities
Observation of the behaviour in fluidised bed of a wide range of granular materials, from onset of fluidisation to entrainment.
Measurement of air flow and pressure drop through a variety of granular materials, as packed and as fluidised beds.
Investigation of the effect of distributor design on bed behaviour.
Investigation of the effect of
a) Superficial velocity
b) Depth of immersion c
) Particle size
on the surface heat transfer coefficient for a hot surface in a fluidised bed.
Demonstration of separation by particle size and density.
Description
A bed of a chosen granular material about 70 mm deep is contained in a vertical glass cylinder. At the lower end of this is a distribution chamber and air distributor which supports the bed when defluidised. This distributor had been designed to ensure uniform air flow into the bed without causing excessive pressure drop and is suitable for the granular material supplied. However, it may be replaced by a locally designed distributor for student projects and other investigations.
On leaving the bed, the air passes through the chamber and escapes to the atmosphere through a filter. The chamber, filter and distributor assembly is suspended from a bracket mounted on the panel. Installed in this bracket are probes for temperature and pressure measurement, and a horizontal cylindrical heater, all of which may be moved vertically to any level in the bed chamber. Air from the local compressed air supply* is delivered through a filter/pressure regulator, an air flow meter fitted with a control valve and an orifice plate (to measure higher flow rates), to the distribution chamber.
When in use, the heat transfer rate from the heater is controlled by a variable transformer, and the voltage and current taken are displayed on the panel. Two thermocouples are embedded in the surface of the element. One of these indicates the surface temperature, and the other, in conjunction with a controller, prevents the heater surface temperature exceeding a set value (up to 200o C). A digital temperature indicator with a selector displays the temperatures of the element, the air supplied to the distributor, and the moveable probe in the bed chamber.
