Practical Boiler Water Treatment Handbook Pdf
Located just below the surface of the water in the steam drum, the continuous blowdown line constantly removes high-TDS water. Modern systems utilize automated conductivity controllers that open and close a modulating valve based on real-time water quality measurements. This optimizes chemical consumption and minimizes thermal energy waste. Bottom Blowdown (Intermittent)
Proper boiler water treatment is vital for several reasons:
Increases foaming tendency, leading to water carryover into steam. 3. The Core Phases of Boiler Water Treatment practical boiler water treatment handbook pdf
Remove bicarbonate, carbonate, and sulfate ions, reducing the amount of carbon dioxide generated in the steam.
): Ideal for low-to-medium pressure systems. It adds to the overall TDS of the boiler water. Hydrazine ( Located just below the surface of the water
Phosphates react with residual calcium to form a soft, non-adherent sludge (calcium phosphate) instead of a hard scale. This sludge settles to the bottom of the boiler and is removed via blowdown.
Cracking along riveted seams, tube ends, or highly stressed metallurgical zones; localized thinning of metal under deposits. ): Ideal for low-to-medium pressure systems
Erratic drum levels; water hammer; conductivity spikes in steam Increase continuous blowdown; use anti-foam agents 6. Boiler Layup Strategies (Idling and Storage)
To ensure enough chemical is present to handle scale. Sulfite Levels: To confirm oxygen protection.
Scale is formed when dissolved hardness salts like calcium and magnesium precipitate from the water under high heat. It is an insulator, which means a layer of scale forces the boiler to work harder, drastically reducing heat transfer. Scale can cause tube metal to overheat, leading to costly failures and downtime. While pre-softening the water is the first defense, it is not enough. Even with soft water, a good internal chemical program using scale inhibitors and dispersants is necessary, as the impurities that cause scale are often more than just calcium and magnesium.
Controls the total dissolved solids to prevent carryover.
