Boiler Operation.

Topics: Water, Boiler, Hard water Pages: 3 (798 words) Published: February 21, 2013

Description of boiler operation

Function of softener is softening the hard water. This is because water supplied is hard water since it contains a lot of calcium, magnesium or other minerals.

Water hardnessMg/L
Soft water≤ 17.1 mg/L
Grey zone between soft and slightly hard water17.1-60 mg/L
Moderately hard60-120 mg/L
hard water120 - 180 mg/L
Very hard water≥180 mg/L

Hard water causes two problems such as
1.Dissolved calcium and magnesium precipitate out of hard water as scale, which builds up on the insides pipeline. Scale reduces flow through pipes and is a poor conductor of heat. Eventually, pipes can become completely clogged. 2.Hard water reduces soap's ability to lather, whether in the shower, sink, dishwasher or washing machine, and reacts with soap to form a sticky scum.

Softener tank is mixed with mixed salt in order to ensure the activeness of rinsing tank.

In heat water tank, softened water is heated up to 90-1000C. In heat water tank, float system is used to ensure the balancing of water flow in and out from the heat water tank to prevent overflow.

A deaerator is a device that is widely used for the removal of oxygen and other dissolved gases from the feedwater to steam-generating boilers. In particular, dissolved oxygen in boiler feedwaters will cause serious corrosion damage in steam systems by attaching to the walls of metal piping and other metallic equipment and forming oxides (rust). Dissolved carbon dioxide combines with water to form carbonic acid that causes further corrosion. Most deaerators are designed to remove oxygen down to levels of 7 ppb by weight (0.005 cm³/L) or less as well as essentially eliminating carbon dioxide

The typical horizontal tray-type deaerator in Figure 1 has a vertical domed deaeration section mounted above a horizontal boiler feedwater storage vessel. Boiler feedwater enters the vertical deaeration...
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