Deaerator Type for Boiler
Deaerator is one of equipment in power plant. Deaerator is used to eliminate corrosive gasses such oxygen in feedwater before supplied into steam boiler. Deaerator has certain working priciple and some types. Classification of deaerator type can described as following below:
- Spray Type Deaerator
Spray type deaerator is used when feedwater need to be heated in advance by using steam as heater. As the Figure 1 below, the steam flow into spray type deaerator will break water into small pieces resulting in gases that dissolve in water being forced out so that the concentration of oxygen in the water decrease.
|Figure 1: Spray Type Deaerator|
- Vacuum Type Deaerator
Working mechanism vacuum type deaerator is gases which dissolve in water is removed by using steam ejectors or vacuum pump. Mechanism vacuum type deaerator can be seen in Figure 2 below until obtain required vacuum. The amount of vacuum depends on water temperature, but usually 730 mm Hg.
|Figure 2: Vacuum Type Deaerator|
1 = Steam inlet
2 = Water cooler
3 = Steam ejector
4 = Disposal
5 = Steam and air outlet
6 = Hot water tub
7 = Cool water outlet
8 = to feedwater pump
9 = Water level inlet controller
10 = Float
11 = Water inlet distribution
12 = Steam and Air Outlet
- Tray Type Deaerator
Tray type deaerator can be shown in Figure 3 below. Tray type deaerator maximize tray or barriers as a medium to enlarge the space to fall for water so that water molecules will separate each other. Furthermore the working principle of tray type deaerator is to force water molecules to spread out making it easier for air release.
|Figure 3: Tray Type Deaerator|