# LFF Fixed and Fluidized Bed Unit

## 創新系統

The Fixed and Fluidized Bed Unit, "LFF", allows a full study about everything concerning the flow of a fluid through a particles bed, both fixed and fluidized.

## 一般說明

The Fixed and Fluidized Bed Unit, "LFF", allows a full study about everything concerning the flow of a fluid through a particles bed, both fixed and fluidized.

The unit is composed of two transparent removable columns for the simultaneous study of the air and water flow through the bed.

In the Fixed and Fluidized Bed Unit, "LFF", each column is connected to a manometers panel, which indicates at all times the pressure drop caused by the bed.

Water is pumped from a tank, located at the back side of the unit, to the bottom of the first column, passing through a flow control valve and a flow meter.

Air is supplied to the second column through a compressor located at the back of the unit. The air flow is measured by a flow meter.

There are glass beads of two different sizes for the bed.

## 練習和指導練習

### 手册中包含的指导实践练习

1. Study of the basis of fixed bed fluidization.
2. Comparison of the fluidization process in water and air currents.
3. Study of the pressure drop through fixed and fluidized beds in function of:
• The flow speed.
• The size of the bed particles.
• Type of fluid: air or water.
1. Verification of Carman-Kozeny equation.
2. Study and determination of the minimum fluidization speed.
3. Study and determination of the fluidization speed and comparison with theoretical calculated values (Ergun equation).
4. Study of differences between particulate and aggregative fluidization.
5. Observation of the "bubbling" fluidization phenomenon.