Specifications:
1) Model: SZL15-1.25-AII coal steam boiler
2) Rated evaporation: 15MT/h 
3) Pressure: 1.25MPa
4) Saturated steam temperature: 194oC
5) Water supply temperature: 105oC
6) Thermal efficiency: 78%
7) Tested thermal efficiency: 82.39%
8) Hearth capacity: 643.8m3
9) Outer size (L x W x H): 10.942 x 4.72 x 6.72m 
10) Effective grate area: 17.25m2     
11) Fuel category: soft coal II

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: 90 x 120mm
7) The front wall is connected by two bars of ascending tubes induced 
    from the boiler cylinder and front concentration cabinet
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: 2,300mm
3) Effective area: 17.25m2
4) Nine 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: 1,320mm
9) Back arc outlet height: 1,009mm
10) Front-back arc coverage rates are 21% and 47%
11) Good smoke leading ability
12) Reasonable inner combustion with the front arc

Design features: 
1) After extensive selection, the vertical hose boiler is easily defined and
    symmetrical facilitating manufacture and maintenance. It is with compact
    size and low metallic consumption, great water capacity and large
    convection heat transfer coefficient 
2) The configuration of the water cool wall structure varies with the heat
    load on the boiler wall. The hearth section is airproof. The outer tube 
    needs to be buried with the boiler wall. The pitch of the convection
    section is 90o. The utilization of δ40 firebrick at the outer tube
    makes the wall structure quite reasonable
3) The down-pull water cooling wall are general found on the bulk boiler 
    for the front arc structure, fire-resistant concrete is poured to improve
    the working environment of the front arc and to settle the problem of
    industrial collapse. The usage life is increased. The back arc is built of 
    arc with adjustable coverage. Therefore, the adaptability of the 
    burning coal categories is extensive
4) The main upper part of convection check smoke orientation device is
    with the form of rotation. The smoke granules can fall into the ash
    outlet to the grate, thus the initial dust exhaust density is greatly
    reduced as well as the convection wear, improving the usage life of the
    boiler. The transformation of the smoke may increase the time of heat
    transfer within the boiler. 380 maintenance channels are reserved at
    the two sides, mixing the smoke fully in burning. In this way, the heat
    transfer efficiency is improved. It is also possible for the maintenance
    staff to enter the check for examination. This advantage is incomparable