2 ton DZL series boiler is a type of packaged boiler, which has the structure of three-pass, fire and water pipe combined. Both sides of the boiler are arranged with light pipe, water-cooling wall. Some ascending tubes are pulled towards the furnace, forming the heating surface of the furnace top. There are refractory materials at the bottom of the drum, so that it will not be radiated by the flame with high temperature. There are two paralleled convection gas passes arranged at the side downwards of the drum. The fractions of coverage of both the front arch and the rear arch are close to 80%, which is beneficial to the coal combustion. The adoption of new type, large block and chain grate realizes the mechanical combustion. The boiler is equipped with forced draft fan, induced draft fan, to operate the mechanical ventilation. Moreover, the slag remover is equipped, to realize the mechanical slagging. The complete controlling and monitoring instruments make the boiler safe and reliable. This series of boiler absorbs the merits from quick fitting boiler; it is compact in structure, the boiler furnace is one storey arranged, convenient for site installation, short in construction period, cheap in cost, simple in operation and etc.
The fuel falls from the coal scuttle to the grate, and then come into the furnace to burn. Passing through the upper side of the rear arch(i.e. the first pass), the flame comes into the combustion chamber, then, from the combustion chamber to the convection gas pass(the second pass), through the front smoke-box into the single-pass thread fire tube bundle(the third pass), then into the economizer, the dust collector. Finally, drawn by the induced draft fan, through the chimney, it is discharged into the air.
Rated evaporation: 2 t/h
Rated working pressure: 1.0 1.25 MPa
Rated steam temperature: 184 194°C
Feeding water temperature: 20°C
Cold air temperature: 20°C
Design thermal efficiency: ≥85%
The transport size of large part: 5200×2100×3492 (mm)
Transport weight of large part: 19.2 t
The safe and stable operational condition range: Thermal load: 70%-100%
Design fuel type: Bituminous coal, anthracite, lean coal