EngZone Engineering Services
Boiler Feed Water Treatment Plants
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EngZone Engineering Services
Boiler Feed Water Treatment Plants
Boiler feed water plays a very important role for the frictionless operation of steam generators.
As they are used 24 hours a day, breakdowns and downtime can be avoided or reduced by correct boiler feed water treatment. Engzone provides different systems for boiler feed water treatment.
First salt and gas are removed from the boiler feed water using a thermal process. All the boiler feed water is vaporized causing high concentrations of substances in the boiler water that attack the steam boiler material and form deposits. By checking and limiting the build up of salt in the boiler water using chemical dosage into the boiler feed water, these problems can be avoided. Prominent offers solutions for such applications.
Boiler Feed Water Treatment Plants
Desalination of the boiler feed water
High cycles of concentration in the boiler feed water can only be achieved if boiler feed water with a low mineral content is available, providing low conductivity. Reverse osmosis and water softening systems are used.
Reduction in Blow with Reverse Osmosis
- If RO Plant is installed for Boiler feed water, the dissolved salts of feed water reduced to 2 ppm. Only two blow downs shall be required in the month.
- This drastic reduction of blow downs will save 10-15% fuel cost and pay back period of reverse osmosis plants shall not be more then 6 months.
- Due to low TDS & boiler feed water, consumption of boiler feed chemicals shall be reduced to 10%
Boiler Feed Water Treatment Plants
Treating the boiler feed water
The boiler feed water treatment is normally done with the following chemicals:
- Hardness stabilizers
- Deflocculating agents
- Corrosion inhibitors
- Oxygen binding agents (e.g. hydrazine)
- pH value regulation (caustic soda, ammonia)
- Deforming agents
Dosing of these chemicals into the tank of boiler feed water is accomplished using dosing pumps Blowdown control
Increase in salinity in the boiler water is monitored by conductivity.
When the maximum value is reached, blowdown occurs. The blowdown valve is opened and boiler water is removed from the boiler. Low-salt boiler feed water compensates for the loss in the boiler and reduces the boiler water conductivity. Part of the boiler water flow is guided across a cooler before reaching the conductivity probe, in order to avoid thermal overload of the probe. To reduce sample water losses, samples can be taken periodically making use of a motorized valve system.