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Silica Scaling in Boilers - Lenntech

Silica is the only boiler water salt which vaporizes at pressures below 2400 psig. It can vaporize at pressures as low as 400 psig. This has caused deposition problems in numerous turbines. The solubility of silica in steam increases with increased temperature: silica becomes more soluble as steam is superheated.

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Prediction of silica carry-over and solubility in steam of ...

Silica content of the boiler water is critical for steam turbines and scaling of boiler heat transfer surfaces. Silica (SiO 2) can volatilize with the steam in sufficient concentrations to deposit in steam turbines leading to scale formation on boiler surfaces.In this work, a simple correlation is presented to predict silica (SiO 2) solubility in steam of boilers as a function of pressure and ...

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Scaling in boilers - Lenntech

If the silica enters the boiler water, the usual corrective action is to increase boiler blowdown, to decrease it to acceptable levels and then to correct the condition that caused the silica contamination. For further information check our web page about silica scaling in boilers.

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Silica in steam - SlideShare

8/4/2014 · SILICA SOLUBILITY Research on the solubility of silica in water and steam shows several important points: • Steam is a solvent for silica • For any particular steam density and temperature, there is a definite saturation solubility of silica Selective silica carryover Figure 1 — Silica distribution ratio Figure 2 — Maximum boiler water ...

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Chapter 18 - Steam Turbine Deposition, Erosion, and ...

Silica has a higher solubility in superheated steam than in saturated steam for any given pressure. If mechanical carryover contributes to the silica content of the saturated steam, the silica will be dissolved during superheating, provided that the total silica present does not exceed the solubility of silica in the superheated steam ...

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Optimising power plant efficiency by measuring silica ...

Silica concentration can be measured at the following process steps (which may vary from one plant to another depending on plant architecture and management methods): - Boiler blow down (drum boilers only). - Economiser outlet. - Steam. - Make-up water. - Condensate polishing. - Demineralisation plant. Increase in steam production

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Steam Purity - Western Regional Boiler Association Home

Steam Chemistry Target Values •Silica –normal saturated steam should be < 20 ppb in most boilers. High pH in the boiler water will reduce silica carryover from the boiler water. Monitor the steam because: •Precipitation of silica forms silicate deposits on the cold end of the turbine that are not water soluble and are very difficult to ...

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TECHNIFAX Selective silica carryover -

With steam silica contents of 0.02 ppm or less, appreciable turbine deposits would not normally occur. A survey of operating experience with utility type boilers confirmed that the 0.02 ppm figure is a valid and realistic maximum limit. Figure 2 shows boiler water silica limits needed to keep steam silica at or below 0.02 ppm. An extensive ...

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Silica Scale Inhibition for Steam Generation in OTSG Boiler

This simple-to-use correlation can be of immense practical value for the engineers to have a quick check on silica (SiO2) solubility in steam of boilers as a function of pressure and water silica ...

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Overlooked Area - Altret

In power plant boilers most critical parameter of water chemistry is Silica in steam. which is the main culprit Steam purity is highly needed and is critical for consistent power genera-tion. It is observed that surface water is being used by many power plant in-dustries …

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