changes of water phosphate in boiler furnace

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Steam Boiler: Control Phosphate in Steam Boiler

Control phosphate in steam boiler is controlling process of phosphate which is supplied into steam boiler. Phosphate is soluble in water alkalinity in the boiler so that the concentration can be maintained by adding sodium phosphate which having different alkalinity.

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EQUILIBRIUM PHOSPHATE DETERMINATION IN HIGH PRESSURE BOILERS

Dec 04 2018 · After the dosage interruption a series of boiler water samples are taken for phosphate residual chemical testing. After you get all the phosphate residuals a curve is obtained and a certain...

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Control of Sodium to Phosphate Ratio in Real Time in a ...

The major boiler chemistry program used in steam electric plants in the United States is some form of coordinated phosphate. Some supercritical and once through boilers are treated by all-volatile means (hydrazine plus ammonia) or oxygenated treatment. The coordinated phosphate approach is to maintain a chemistry in the bulk boiler water.

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(PDF) Using Of Congruent Phosphate As Equilibrium ...

It appears that congruent phosphate salts can be used to treat boilers water in the equilibrium phosphate region in case of demineralised feed water taking into account two main modifications; first reduction of sodium hydroxide added to the range of 5 to 10% in order to prevent free alkalinity in boilers water and second reduction of Na/PO 4 to 2.6 ratio.When sodium hydroxide reduced to less than 10 % and

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The Role of Calcium Phosphate in Internal Boiler Water ...

The pretreatment of the boiler feed water consists of using multimedia filters to reduce the suspended solids and colloidal material in feed water simple lime softening(hot or cold) soda ash or zeolite softening. A total demineralization and removal of organic compounds from the softened water are achieved by using ion exchange reverse osmosis membranes and electrodialysis. Any of these

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pH Treatment | CleanBoiler.org

It can take two forms: caustic gouging or caustic cracking also called caustic embrittlement. Caustic attack or caustic corrosion is often encountered in phosphate treated boilers in which deposits of phosphates or other scale occur in high heat transfer areas. Boiler water can permeate the porous deposit resulting in localize corrosion.

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Determination of phosphate concentration in boiler water ...

Jul 11 2008 · The impossibility of unambiguously estimating phosphate concentration by measuring boiler-water conductivity in a high-pressure drum boiler (p b = 13.8 MPa) is shown. Mathematical models of ion equilibria in boiler water which allow one to determine the concentration of phosphates and other ion admixtures from the measurement data obtained with the use of standard (conductormeters and

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(PDF) Using Of Congruent Phosphate As Equilibrium ...

The concentration of phosphate in boilers water is dependent on drum pressure and water quality a typical high pressure boiler fed with de-mineralized water would tend to run with low concentration of 1 to 5 mg/l range while a lower pressure boiler running with softened water might go to 25 mg/l.High alkalinity can occur either as a result of steam blanketing or by localized boiling beneath scale or porous

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EQUILIBRIUM PHOSPHATE DETERMINATION IN HIGH PRESSURE BOILERS

Dec 04 2018 · After the dosage interruption a series of boiler water samples are taken for phosphate residual chemical testing. After you get all the phosphate residuals a curve is obtained and a certain...

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Phosphate corrosion in high-pressure boilers (Journal ...

Phosphate treatments have been used in boilers for more than 70 years. As operating pressures increased the frequency of corrosion-related failures in phosphate-treated boilers also increased. Many failures were attributed to ``free`` caustic generated by the nonstoichiometric precipitation of various phosphate compounds on boiler surfaces.

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