Specifications

Carbon adsorption towers

• AS 3000 Electrical (If Electrical Components fitted)

• AS 1210-1997 (Unfired Pressure Vessel Design Standard)

• AS 1210 Coded and stamped vessels (Other design codes available)

• Tower safety relief valve (optional – Only on Some Models)

• Tower pressure gauge (Optional)

• Proprietary Internal Screens to reduce velocity and reduce erosion.

• Pre Filtration (Optional)

• Post Filtration (Optional)

The Oxair Carbon Adsorption Tower has been designed, engineered, manufactured and factory-tested to ensure many years of reliable operation. The Oxair Carbon Adsorption Tower consists of a Single Tower (Pressure Vessel) filled with Activated Carbon Adsorbent. The Carbon Tower is primarily used to reduce oil vapour in compressed air to very low concentrations. Other Hydrocarbon Vapours normally absorbable by Activated Carbon are also removable.

They are used where oil vapour and the subsequent odour produced in the compressed air stream could contaminate end products (Food, Drug Manufacture, etc) or for odour elimination where compressed air is exhausted into confined worker environments. They are also effective in removing oil Vapour ahead of desiccant Air Dryers to preserve desiccant life.

DESIGN CRITERIA

• The Carbon Adsorption Tower has been designed to prevent bed movement and Carbon Degradation (Dusting) through Maximum flow conditions.
• The Large beds ensure sufficient contact time to produce the outlet concentrations as desired.
• Separate Fill and Drain ports for ease of Carbon replacement (No piping to disconnect)
• Full Diameter Stainless Steel Screens and Screen diffusers (top and bottom). Prevents channelling
• Internal Anti Static Earthing Rod
• External Earthing Lug

OPERATION

The Oxair Carbon Adsorption Tower is specifically designed to remove Oil Vapour from a compressed Air Stream. The compressed Air/Gas laden with Oil Vapours enters the bottom of the Carbon Tower and flows upward through the bed and exits out the top. The Special Activated Carbon has a great affinity for Oil and Oil Vapour; therefore it works by (adsorbing) contaminates onto the surface of its internal pores and allows the Oil and Oil vapour to be impregnated and retained onto the surface of the Carbon.

The life of the Carbon is fully dependant on the temperature at which the Air enters the Carbon Tower as well as the amount of Oil or Oil Vapour in the compressed Air stream. This process continues until the Carbon is saturated. When this occurs, the spent carbon is removed from the tower and replaced

NB: If the Air is heavily laden with moisture the Carbon may not work as efficiently which in turn de-creases the Oil adsorption capacity of the Carbon. The water will wet the carbon creating a barrier and Oil carry over may result.

PRE-FILTRATION

All Carbon Adsorption Towers are designed to remove Oil in the vapour phase. The possibility of liquid carry over to the Carbon must be avoided and will greatly extend the life of the Carbon.

Proper filtration including Water Separators and Oil Removal Coalescing Pre-Filter package will eliminate the carry over of droplets and aerosol-sized mists of both liquid water and compressor lubricant (oil). The use of an Oxair Coalescing Filter package will enhance the Oil adsorption capability of the Carbon Tower .

POST-FILTRATION

A 1 micron Dust Filter should be installed after the Carbon tower to prevent any Carbon Dust and solid contaminates one micron and larger from going downstream.

Bed life

At an inlet oil vapour concentration of 0.1ppm w/w, the Carbon Adsorption Tower has a life of between 50,000 to 60,000 hours at rated flow conditions. This concentration corresponds to Air saturated with typical mineral oil at 75°F and 100 PSIG

At inlet oil Vapour concentration of 0.35ppm w/w, the Carbon Tower has a life of 15,000 hours at rated flow conditions. This concentration corresponds to air saturated with typical mineral oil at 100°F and 100 PSIG.