The curvature design of the grates keeps the grates closed without the aid of auxiliary weights, when making the turn around the sprockets. With this design, no gaps appear between the grates, thereby directing all foreign materials into the ash pit and not into the drive shaft mechanism.
In stoker firing, part of the fuel is burned in suspension and part on the grate. The fuel is projected across the furnace by a series of fuel feeders with a uniform spreading action. permitting suspension burning of the fine particles during travel. The larger pieces fall on the grate for combustion, forming a thin fast burning fuel bed from 1 to 2 inches thick.
This method of firing fuel provides for extreme load fluctuation as ignition is almost instantaneous on increase iring rate and the thin fuel bed can be burned out rapidly when required.
The Travelling Grate has an extraordinary ability to burn any type of fuel with wide range of burning characteristics with no limit on ash content.
An Over fire air system is provided for successful suspension burning. This air mixer with furnace gases and creates turbulence required to complete combustion.
To compensate for variation of the ash content in the fuel, the grate speed can be adjusted manually. The ash is continuously discharged over the front end of the grate into an ash pit or hopper.
Salient Features :
CATENARY DESIGN provides for automatic take up or tensioning of grate chains to prevent jamming. Effective catenary is maintained by gravity, thus making external shaft adjustments unnecessary
GRATE SURFACE consists of a series of grates specifically designed for spreader stoker firing. To reduce maintenance cost grate surface W made in short sections (12, 9") of best quality, heavy - duty, heat resisting cast iron alloy with uniformly spaced tapered .If - cleaning air - metering openings and with close fitting overlapping edges to prevent air leakage at the joints.
GRATE CURVATURE design keeps the grate closed without the air of auxiliary weights when making the turn around the sprockets, with this design, no gaps appear between the grates, thereby directing all foreign materials in to the ash pit and not into the driven shaft mechanism.
GRATE ACCESS is provided by a Grate removal door. Design is such that any grate section can be replaced without taking stoker out of service. Simply remove single bolt, nut and washer and slide the grater off the grate bar.
GRATE SUPPORT within the fumace is provided by a series of skids a. skid rails, each constructed of chill hardened cast Iron for maximum life.
FRONT AND REAR SHAFT catty the grate chains on hardened sprockets. Bearings and sprockets are strategically loc.. along the shafts for maximum load - bearing efficiency
THE GRATE CHAIN are forged steel thereby eliminating breakage and grate shutdown.
FRONT AND REAR AIR SEALSautomatically keep excess air to minimum within the furnaces.
UNDERGRATE ACCESS DOORS located on each side of the stoker frame, provide inspection of and access to grate catenary.
HEAVY DUTY FLANGE COUPLING connecting hydraulic/Planetary drive and main drive shat.