HOC Air Dryer

A great solution for wastewater streams of activated alumina filter arsenic

HOC Air Dryer

HOC Air Dryer is an energy efficient solution for industrial drying needs that can be installed and maintained at very low costs compared to contemporary alternate methods available. HOC stands for Heat OF Compression where the heat caused by the rapid compression of air is used as the source of heat for the purpose of drying.

First introduced in the 1960’s this technology has been serving the needs of the customers for over 50 years.

The use of a constant source of heat that is non regenerative will lead to very high operational costs due to the need to sustain the source of heat. HOC Air Dryers are regenerative dryers that do not need constant resupply of heat but recycles the generated heat to complete repetitive cycles of drying and thereby achieves large scale heating at a fraction of the cost of alternative methods.

This ingenious solution is achieved with the aid of a desiccant that absorbs the moisture and keeps the air dry for the next cycle. The use of dry air is further advantageous as this air contains little or no contaminants like dust, moisture or oil that can damage the valves, tanks and pneumatic systems of the complex machinery used in the industrial production stages. This reduces chances of damage and breakdown of critical systems, hence makes production systems more reliable.

Heat of compression Air Dryer makes use of an oil free compressor and therefore is more efficient and reliable. The availability of these oilless compressors have increased while costs have decreased.

The system runs compressed air which is heated through the chamber with desiccant bed that absorbs the moisture and then passes this to the heat exchanger and then purge air is back drafted to the first chamber to reactivate the medium and help continue the cycle by preparing it for the next cycle.

Desiccant is the substance that pulls the moisture from the air surrounding it. The desiccant helps achieve dew points especially when used in secondary stage it achieves dew points ranging from -40 degree C to -60 degree C and therefore ensures dryness. Common agents used as desiccants include Silica Gel, Activated Alumina and Molecular Sieve.

The moisture from the from the air is cooled using an intermediate cooler which condenses the moisture and with the help of the auto drain the moisture is removed from the system.

The two tower system can help speed up process and ensure that the desiccant is regenerated using the compressed air within the chamber. Hot air is introduced into the system at temperatures ranging from 140 degree C to 220 degree C.

The hot air is used past utility with the aid of automated valves controlled with the help of programmable logic controllers to ensure a steady supply of hot air to the chamber. This also ensures that the drop of pressure levels is very minimal and eliminates need for constant pressurization and the heat recovery system combined delivers cost savings to the consumer.

The design and simplicity of the whole machinery helps in minimizing the chance of a break down, this guarantees a long, reliable, trouble free operation with low maintenance. The easy maintenance also reduces down time of system. The desiccants are long lasting, requiring few change over.

The saving is also passed onto the electrical heater by reducing the dependance on it.

The use of automated systems helps not only ensure accuracy but helps in remotely monitoring and controlling the process.

Common industrial applications can be found in

  • Food & beverage Industries
  • Thermal Power Plants
  • Pharmaceutical Industries
  • Automobile Plants
  • Electronic Industry
  • Textiles
  • Petrochemical