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Boiler Water Treatment

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Proper treatment of boiler feed water is an important part of operating and maintaining a boiler system. As steam is produced, dissolved solids become concentrated and form deposits inside the boiler. Improper treatment of boiler water can lead to problems such as:

  • Oxygen Pitting
  • Corrosion
  • Scaling
  • Foam Formation
  • Sludge Formation

Oxygen Pitting:  One of the most serious aspects of oxygen corrosion is that it occurs as pitting. This type of corrosion can produce failures even though only a relatively small amount of metal has been lost and the overall corrosion rate is relatively low. The degree of pitting depends on the concentration of dissolved oxygen, the pH and the temperature of the water.

Oxygen pitting occurs in boiler tubes, and turbine blades. It is also the reason for failure of steam lines, and fittings etc. as well as the root cause of unscheduled shut downs. Envirochem Systems can recommend the correct chemical treatment through oxygen scavengers which remove oxygen instantly and control pitting.

Corrosion:  Corrosion is a significant problem caused by water in boilers. Corrosion can be of widely varying origin and nature due to the action of dissolved oxygen. Corrosion may occur in the feed-water system as a result of low pH water and the presence of dissolved oxygen and carbon dioxide. Corrosion leads to boiler piping becoming weak and leading to leakage problems.

Envirochem Systems offers a range of proven corrosion inhibitors to solve corrosion in boiler systems.

Scaling:  Scaling occurs due to impurities being precipitated out of the water directly on heat transfer surfaces or due to suspended matter in water. Evaporation in a boiler causes impurities to concentrate. Common feed water contaminants that can form boiler deposits include Calcium, Magnesium, Iron, Aluminum and Silica. Scale is formed by salts that have limited solubility but are not totally insoluble in boiler water. These salts reach the deposit site in a soluble form and precipitate.

Scaling leads to loss of heat transfer efficiency and often, acts as an insulator. In the long run, it can lead to severe problems such as rupturing of tubes and aiding of corrosion. In general, boiler deposits can cut operating efficiency, damage equipment, lead to unscheduled boiler outages and increased cleaning expenses. Scaling can also impact fuel consumption and power cost of steam generation.

Envirochem uses different types of antiscalants to treat boiler scaling problems and minimize the damage based on an in-depth chemical analysis of the feed water.

Foaming:  Foaming is a condition that occurs in boilers when there are high concentrations of soluble salts, suspended solids or organic matter. These create foam in the steam space of boiler that adversely impacts the quality of steam produced.

De-foaming and anti-foaming chemical treatments are used selectively to treat this problem.

Sludge:  During the operation of a steam boiler small quantities of hardness salts are introduced, together with traces of suspended matter into the feed-water. Over time the concentrations of these salts and suspended matter build up, in the form of a 'sludge', and if not treated properly can settle on to heat transfer surfaces, eventually 'baking' on to form a hard crystalline scale.
Envirochem Systems offers sludge conditioners to minimize sludge formation problems.

Envirochem Systems’ comprehensive range of Boiler Water Treatment solutions can lead to the following benefits:

  • Improving Heat Transfer Efficiency.
  • Improving Feed Water Quality
  • Minimize in unscheduled downtimes for maintenance.
  • Better control on Blow down frequency.
  • Reducing Fuel consumption cost.

Our wide range of specialty chemicals for Boiler Water Treatment is available under the EnviroBLAZE brand.

 



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