Specifications:
1) Model: SZL20-1.6-AII coal steam boiler
2) Rated evaporation: 20MT/h 
3) Pressure: 1.6MPa
4) Saturated steam temperature: 204oC
5) Water supply temperature: 105oC
6) Exhaust smoke temperature: 165oC
7) Tested thermal efficiency: 81.24%
8) Outer size (L x W x H): 12.4 x 4.72 x 7.7m 
9) Heated surface: 815m2     
    a) Radiation: 61m2 
    b) Convection: 333.7m2
    c) Coal saver: 295m2
    d) Air preheating: 125.3m2
10) Effective grate area: 20.8m2     
11) Boiler collocation: indoor single layer
12) Fuel category: soft coal II
     a) Low position heating value: 18,757kJ/kg
     b) Volatilization: 28.8%
     c) Ash: 30.4%

The boiler is with a dual cylinder longitudinal structure and natural cycle methods consisting of the upper components with the dominant main parts. The lower components are primarily the combustion equipment. The two main parts can be instantly installed and manufactured. Only the boiler wall and back arc of the upper and low main parts need to be constructed. Connect the smoke wind tunnel with the pipeline, meter, valve and the coal saver before pouring the front arc.

Structure: 
1) Upper and lower cylinder diameter: φ 900mm 
2) Cylinder central distance: 2,300mm 
3) 7 Left-right cabinets: φ219mm
4) Level central distance: 2,800mm
5) Hearth water cooling wall pitch: 67mm
6) Convection check distance: 96 x 120mm
7) The front wall is connected with the front concentration cabinet by 2
    bars of ascending tubes induced from lower cylinder
8) The boiler check and the water cooling wall are welded and connected
    with the upper and lower cylinders 

Combustion equipment: 
1) Light chain-grate stoker
2) Width: 2,700mm
3) Effective area: 20.8m2
4) Eight independent wind storage cabinets
5) Dual-side air inlet ash door
6) Brick boiler arc
7) Front water cooling arc and level angle are 20o 
8) Outlet height: 1,110mm
9) Back arc outlet height: 1,009mm
10) Front-back arc coverage rate is 74.4%
11) Obliquity: 10o
12) Reasonable inner combustion within the boiler with front arc
13) Good smoke leading ability