# CAG Gas Absorption Column

## 創新系統

The gas absorption column is a scale unit designed to study hydrodynamic and absorption processes in packed columns.

## 一般說明

The Gas Absorption Column, "CAG", is a scale unit designed to study hydrodynamic and absorption processes in packed columns. This system absorbs ammonia or CO2 from a mixture with air in a watery solution that descends along the column.

The main parts of the unit are:

• Packed column: it consists of a glass cylindrical column filled with Raschig rings.
• Liquid circuit (water): the liquid, that is stored in a PVC tank, is impelled towards the column by a pump. It feeds the column through its upper end using a glass diffusion shower. After crossing the column, the liquid is returned to the storage tank. The liquid flow that arrives to the column is measured with a flowmeter. In the storage tank, through aeration, the CO2 can be desorbed from the liquid previously filled in the column.
• Gas circuit (air and CO2): it consists of a CO2 and air (supplied by a blower) mixture current. Both gaseous currents are mixed, and later they enter the base of the column through a side inlet located below the bed level, so that the gaseous mixture is an homogeneous as possible. Both gas flows are measured by flowmeters.
• CO2 measuring system: it allows to determine the concentration of this gas in the currents originated from the upper and central parts of the column.

## 練習和指導練習

### 手册中包含的指导实践练习

1. Study of the basic principles of the absorption of a gas into a liquid using a packed column.
2. Gas stream analysis.
3. Study of the hydrodynamic characteristics of a packed column.
4. Determination of the drag and flooding flows.
5. Determination of the mass transfer coefficient.
6. Checking of the mass balances.
7. Demonstration of methods of gas and liquid quantitative analysis.
8. Investigations of the variables influencing the efficiency of the absorption.

### 与该单位进行更多实际操作

1. Determination of the water, CO2 and air flow.
2. Head loss in the column.
3. Study of the simple desorption process.
4. Measurement of the CO2 concentration in gaseous currents using a CO2 meter (It requires the additional recommended element CAG/M).
5. Influence of temperature on the adsorption efficiency. (It requires the additional recommended element TERA).