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With oxygenated treatment, oxygen is injected into the feedwater to keep the oxygen level between 30 and 50 ppb. OT programs are most commonly used in supercritical (i.e. >3250psi) power boilers. The ability to change an existing sub-critical boiler over to an OT program is very limited.
Boiler water treatment is used to control alkalinity, prevent scaling, correct pH, and to control conductivity. [3] The boiler water needs to be alkaline and not acidic, so that it does not ruin the tubes. There can be too much conductivity in the feed water when there are too many dissolved solids.
The reduction of blowdown by dealkalization keeps the water treatment chemicals in the boiler longer, thus minimizing the amount of chemicals required for efficient, noncorrosive operation. [2] Carbonate and bicarbonate alkalinities are decomposed by heat in boiler water releasing carbon dioxide into the steam.
Boiler water treatment is a type of industrial water treatment focused on the removal or chemical modification of substances potentially damaging to the boiler. Varying types of treatment are used at different locations to avoid scale , corrosion , or foaming . [ 3 ]
DEHA is largely used as an oxygen scavenger in water treatment.. It is a volatile oxygen scavenger [2] [3] and reacts in a ratio of 2.8/1 DEHA/O2.It is employed in high pressure (>70 bar) boiler systems due to a very low rate of reaction at low temperatures and pressures.
Monitoring the pH value of the feed water gives direct indication of alkalinity or acidity of this water. The ultra pure water has pH value of 7. In steam circuit it is normal practice to keep the pH value of feed water at slightly alkaline levels using chemical dosing. This helps in preventing the corrosion of pipe work and other equipment.
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Scale deposition in boilers can reduce heat transfer efficiency and increase energy consumption. Antiscalants are added to boiler feedwater to prevent scale formation on heat transfer surfaces, piping, and other boiler components. Water treatment plants can use antiscalants to maintain filtration. [3]