Boiler feed water
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. ProMinent 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 vaporised 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.
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.
Treating the boiler feed water
The boiler feed water treatment is normally done with the following chemicals:
- Hardness stabilisers
- Deflocculating agents
- Corrosion inhibitors
- Oxygen binding agents (e.g. hydrazine)
- pH value regulation (caustic soda, ammonia)
- Defoaming 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 motorised valve system.
ProMinent supplies the system components needed for the boiler feed water treatment:
| Application |
ProMinent plants |
| Boiler feed water softening |
Dulcosmose® reverse osmosis systems |
|
Dosing of inhibitors:
- Hardness stabilisers
- Deflocculating agents
- Corrosion inhibitors
- Defoaming agents
|
Dosing systems for dosing of inhibitors |
| Oxygen binding agents |
Hydrazine decanting and dosing systems |
| Blowdown control |
Cool control blowdown control |
| Regulating the pH value |
DULCOMETER® and DULCOTEST® measurement, control and sensor technology |
