Table of Contents
Why is feed water treatment for a boiler necessary?
Proper treatment of feedwater is the most important task in operating any boiler. Scale that collects and forms inside the boiler has lower ability to transfer heat than steel and will raise the metal tube temperatures, creating blisters and overheating failures.
What are the problems encountered in boiler feed water?
When treating boiler feed water (the combination of boiler makeup and condensate return water), several issues can arise that cause boiler scaling, corrosion, fouling, and system failure.
What problems occur can arise in boilers if maintenance is not carried out properly?
The fuel system, particularly the burner, requires periodic cleaning and routine maintenance. Failure to maintain the equipment in good working order could result in higher fuel costs, the loss of heat transfer or even a furnace explosion.
What is the importance of feed water treatment Mcq?
Feed water is heated only for four reasons : to improve overall efficiency, to remove dissolved impurities, to avoid thermal stress going to entering of cold water to the boiler and to precipitate impurities carried by steam and condensate outside the boiler.
What are the requirements for boiler feed water?
Characteristics of boiler feed water
| Working Pressure (Bar) | ||
|---|---|---|
| 75 – 100 | ||
| Dissolved oxygen (measured before oxygen scavenger addition) | mg/l | 0.02 (Physical removal of dissolved oxygen) |
| Total hardness | French degrees | 0.05 |
| Oily matter | mg/l | 0.05 |
How does a boiler feed water system affect boiler operations?
Low-quality boiler feedwater contains impurities and gases that can damage the whole system. This will lead to a reduction in efficiency and, even worse, boiler leaks or system leaks. In order to prevent this from happening, you must determine what impurities are in your raw water.
What are the several reason why failure in starting the boiler occurs?
The flame failure trip in a typical boiler can be due to one of the following reasons: loss of ignition; fuel valve closed, unstable flame, low airflow, very high furnace pressure, dirty flame sensor and loss of electrical supply.
What would happen if the boiler runs dry?
In a dry fire accident, there is no water to moderate the temperature. As a result, the boiler’s steel can overheat, warp and crack at the welds. If the boiler has run dry and water is introduced before the boiler has cooled, the water could flash into instant steam and burst the boiler.
What is boiler water treatment?
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.
What is feed water treatment?
Feedwater treatment is a pre-water treatment process to control deposition, eradicate impurities and prevent corrosion within a boiler system. In a boiler system, water is transformed into steam and expands by as much as 1000 times as it passes through steam pipes at rates of 100km/hr.