DESCRIPTION

Wetted wall columns may be used to determine gas/liquid mass transfer coefficients, essential when calculating the design of absorption towers. Such coefficients form the basis of correlations used to develop packed towers.

CES examines the absorption of oxygen from air into deoxygenated water (prepared by nitrogen sparging). This is an example of liquid film controlled absorption.

The liquid film mass transfer coefficient can be determined at various mass flow rates of water.

The system components are mounted within a floor standing painted steel framework.

The wetted wall column is a glass column with water inlet and outlet sections and is gimbal mounted to ensure that it can be set accurately in a vertical orientation.

The deoxygenating column is of similar overall size to the wetted wall column, standing vertically adjacent to it. Beside the column is a control console housing flow meters, pump controls and oxygen analyser. Situated between the columns are two special housings containing the oxygen analysis probes which monitor the oxygen content in the water entering and leaving the absorption column. The apparatus uses water as the working medium, contained in a storage tank at the rear of the unit. Pumps delivering water to the deoxygenator and the absorption column are located at the base of the unit.

In operation, water is sparged with nitrogen in the deoxygenator before entering the top of the wetted wall column. Air is pumped by the integral diaphragm-type air pump into the base of the column. The air passes up the column, giving up the oxygen to the water. Dissolved oxygen at inlet and outlet can be measured in rapid succession. The water drains into the storage tank to be recycled to the deoxygenator.

TECHNICAL SPECIFICATIONS

• WETTED WALL COLUMN

  Height: 900mm
  Internal diameter: 32mm
  Material: Glass

• DEOXYGENATING COLUMN

  Height: 1570mm
  Internal diameter: 26mm
  Material: Clear acrylic
  Range: 600-5000 ml/min

• WATER FLOW METER

  Range: 20-280 ml/min

• DEOXYGENATOR

  Feed pump: 20 l/min @ 2m head
  Absorption column feed pump: 10 l/min @ 1m head
  Air feed pump: 24 l/min @ 1 kg/cm2
  Sump tank capacity: Approx 40l

   

• XYGEN METER

  Saturation

  Range: 0-199.9%
  Accuracy: ± 0.5%
  Resolution: 0.1%
  Temperature compensation: 0-50°C automatic

• CONCENTRATION

  Range: 0-19.9ppm
  Accuracy: ± 0.2ppm
  Resolution: 0.1ppm
  Temperature compensation: 0-50°C automatic

• TEMPERATURE

  Range: -100°C to +200°C
  Accuracy: ± 0.3°C
  Resolution: 0.1°C

EXPERIMENTAL CONTENT

• Calculation of liquid film mass transfer coefficients
• Variation of coefficient with mass flow rate
• Variation of oxygen flow rate to determine power law relationship
• To determine the power-law relationship between the liquid film mass transfer coefficient

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