What are those chemicals used in treating the water in the boiler?
What are those chemicals used in treating the water in the boiler?
The softening chemicals used include soda ash, caustic and various types of sodium phosphates. These chemicals react with calcium and magnesium compounds in the feed water. Sodium silicate is used to react selectively with magnesium hardness.
What is tannin in boiler water?
Tannin has proven itself to be highly effective against oxygen corrosion due to its nature as an oxygen scavenger, by removing the oxygen from the boiler. Additionally Tannin will form a thin corrosion resistant tannate film across the boiler surface.
What is the most widely used agent for chemical de aeration?
Across all boiler feedwater systems that operate at or below 600 psig, the most commonly used oxygen scavenger, or reducing agent, in boiler feedwater systems is either sodium sulfite or the bisulfite analogue of sodium sulfite.
What are the 5 control of boiler carryover?
As discussed earlier, the principle chemical factors causing carryover are the dissolved solids, suspended solids, alkalinity, silica (vaporous carryover), and oil contents of boiler water. In many cases, limiting the concentration of these components will satisfactorily control carryover.
What is purified tannin?
Purified Tannin is mostly composed of natural ingredients extracted from tree bark. It is a renewable technology that is friendly to the environment on top of being an effective treatment solution. Non-Toxic and Biodegradable.
Is tannin an oxygen scavenger?
WTPS28 is a formulated blend of selected natural tannins. WTPS28 is a convenient liquid oxygen scavenger and is recommended for use in steam boiler plant, feedwater storage tanks and closed circuit heating systems. WTPS28 provides corrosion control by scavenging oxygen and by forming a protective iron/tannate film.
Why ammonia and hydrazine is added in boiler feed water?
The purpose of ammonia dosing is to control the pH of water; pH is kept slightly alkaline to avoid corrosions from chloride and other salts, whereas DO is scavenged by dosing hydrazine. A very low ppb of DO can cause severe corrosion by pitting. Therefore a slight residual of hydrazine is kept in the system.
Which is used to remove dissolved oxygen in high pressure boilers?
Resistance boilers generate heat by means of a coiled heating element. High-quality makeup water is necessary, and sodium sulfite is usually added to remove all traces of dissolved oxygen.
