Protecting boilers through deaeration.

Tank corrosion is an ongoing concern of any boiler system. No matter how many potential contaminants are filtered from the feed water before use, the process of boiling can be inherently corrosive. This is because the boiling process produces dissolved oxygen. The dissolved oxygen and other gasses can then attach to the lining or walls of a tank. Once present, oxygen is a fundamental catalyst for rust or other forms of corrosion.


Tank corrosion is an ongoing concern of any boiler system. No matter how many potential contaminants are filtered from the feed water before use, the process of boiling can be inherently corrosive. This is because the boiling process produces dissolved oxygen. The dissolved oxygen and other gasses can then attach to the lining or walls of a tank. Once present, oxygen is a fundamental catalyst for rust or other forms of corrosion.

A deaerator process can be used to remove oxygen from the interior of the tank and prevent oxidation from ruining a tank. spray type deaerator can be used in a horizontal or vertical configuration, depending on the boiler.

In the process, spray water is heated and sprayed to a number of layers of trays. Steam then “scrubs” the tank feed water to remove dissolved oxygen and other gasses, which are then vented outside the tank. Deaerated liquid then settles at the bottom of the tank. It can handle high volumes of feed water, is relatively low maintenance and has a long useful life span.

Another method of deaeration doesn’t use a system of trays. Instead, it uses a large system of spray nozzles for feeder water distribution. When the fine spray contacts steam, the corrosive gases are released and vented outside the tank. The steam then condenses back to a liquid with remaining gases vented. This method has certain advantages. It is generally less expensive to construct, operates quietly and quickly. Is can lower dissolved oxygen levels to 7 parts/billion.

Due to the process of deaeration, the large volumes of water passing through the system and the heating temperature of the boiler, quality control of the deaerator must be strict. The best manufacturers utilize heavy gauge stainless steel for the collection trays, quality welding and properly engineered spray orifices. Quality manufacturers will have experience in building several different types of configurations to meet the needs of the customer.
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