The presence of high levels of temporary hardness (high alkalinity) in the raw water supply feeding a highly rated package boiler can result in high blowdown rates and an associated very high level of carbon dioxide in the steam. The resultant condensate has an acidic pH and the water is very aggressive to the metals in the condensate system. This is where the Envirogen Dealkalisation Plant comes in.
Iron fouling of steam traps, poor
operation of steam traps and high cost of replacement condensate
pipework can result in a significant on cost to the boiler operation.
To treat this type of water related problem requires consideration be
given to the Envirogen Dealkalisation/Degas/Base Exchange plant.
The reliable Envirogen standard range
of Degas-Base Exchange Dealkalisation Plant effectively reduces the
alkalinity and hardness salts from the water giving a water of the
Bicarbonate alkalinity – less than 5%
average of the input alkalinity
Total dissolved solids reduction –
approximately equal to the temporary hardness
Envirogen water technologies have standard modules for:
- Break tanks
- Raw water and degas booster pump
- Dealkalisation columns
- Degasser towers
- Acid measure tanks
- pH correction and caustic sets
- Softening columns
WAC ion exchange, degassing tower & bulk chemical storage designed and installed by Envirogen.
Combining the standard modular
dealkalisation range with the standard softening plant range gives a
fully dealkalised and fully softened water.
For plants not wishing to have acid on
site for regeneration and for sites with space restrictions which
limit a degasser tower, Envirogen has available a “Chloride Anion
In certain areas, where the waters
contain high levels of sodium bicarbonate, Envirogen Water Systems
recommends a more specialised “Split Stream Dealkalisation Plant”