Chelant Control. Chelants are the prime additives in a solubilizing boiler water treatment program. Chelants have the ability to complex many cations (hardness and heavy metals under boiler water conditions). They accomplish this by locking metals into a soluble organic ring structure. The chelated cations do not deposit in the boiler.
Characterization of the U.S. Industrial/Commercial Boiler
7.0 Chemical Treatment - Steam Turbine, Steam Boiler
Water Handbook - Preboiler & Industrial Boiler Corrosion
Boiler – Fundamentals and Best Practices
Sodium sulfite, hydrazine, hydroquinone, or another scavenger is added to control dissolved oxygen, according to the following requirements: Sodium sulfite. 3 lb of sodium sulfite and 3 lb of caustic soda should be added per 1000 gal of water contained in the boiler (minimum 400 ppm P-alkalinity as CaCO3 and 200 ppm sulfite as SO3).
control to keep the boiler outlet pressure constant the steam pressure transmitter inconstant. the steam pressure transmitter in the main steam line sends the signal to the controller which in turn sends an output signal to the feeder motors in the solid fuelsignal to the feeder motors in the solid fuel fired boilers and to the fuel control valve
make it nonadherent to the boiler metal • to control the causes of boiler water carryover • to eliminate oxygen from the feedwater • to provide enough alkalinity to prevent boiler corrosion In addition, a complete treatment program should prevent corrosion and scaling of the
To prevent boiler scale, the water treater can use one of two types of treatment approaches – a chelant program or a precipitation program. The word chelant is taken from the …
BOILER CONTROLS &BOILER CONTROLS & INSTRUMENTATION