Air Removal (Deaeration) Systems
Deaeration is principally intended to remove any air present in the material to be processed. In many cases it is desirable to extract air as, during treatment, it can increase thermal resistance and increase heating load. This is because it will absorb some of the heat applied to the product, thereby reducing the overall thermal efficiency of the heat exchanger. The presence of air in many products, such as food, encourages oxidation and may be detrimental to product life or quality.
For these HRS developed an air removal (deaeration) module which can be fitted into the production line before thermal treatment takes place. The principal components of the air removal module include:
- Automatic valves: Product inlet from the atmospheric storage in the line (also included is water inlet for rinsing and flushing and CIP cleaning); return from the sterilising section.
- Manual valves: Product pump feed, deaerator drainage.
- Vibratory level indicator: To give the minimum safe working level for the product pump.
- Proportional level indicator: To measure the level of product within the tank continuously.
- Cleaning sphere: For distributing the CIP solutions within the vessel.
- Manhole: For maintenance operations and internal inspections of the deaerator, etc.
- Pressure sensor: To control the vacuum generated in the interior of the vessel.
- Polycarbonate sight glasses: for visual inspections.
- Vacuum line: Aroma condenser, liquid ring vacuum pump, manual vacuum break, vacuum gauge, etc.
AIR REMOVAL SYSTEM FUNCTIONS
Working under vacuum, the deaerator pulls the air and/or other volatile components which could have entered, to the surfaces of the product.
The product enters through an automatic valve and a condenser is included in the upper part to recover aromas and other volatile organic compounds which are returned to the vessel by gravity to be reincorporated into the product. The level of vacuum is controlled automatically by an electronic pressure sensor and the condenser is cooled using tower water. The aroma condenser is based on an MI Series corrugated tube shell and tube heat exchanger.
The deaerator also acts as a buffer tank for the product, regulating the flow to the production line. The flow rate can be adjusted and a flow-meter is installed to give precise control.
In order to achieve effective CIP cleaning a centrifugal CIP pump is fitted in series with the product pump. Beyond the product pump a safety valve is fitted to prevent over-pressurisation of the processing line, a pressure gauge and a visual thermometer are also fitted before the product heating section.
The Air Removal (Deaeration) system includes the following components:
- Deaerator vessel
- Helicoidal positive displacement pump
- Centrifugal CIP pump
- Aroma condenser
- Liquid ring vacuum pump
- Electromagnetic flow meter
- Valves, instrumentation and other necessary elements
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