Detroit Reciprograte® Refuse Fired Stokers

For waste to energy systems

• RotoGrate
• Hydrograte
• RotoStoker VCG
• Reciprograte
• WoodPak

The Detroit Reciprograte Stoker has met with wide approval for burning unprepared municipal and industrial solid waste as fuel.

Mass Burning:

The Detroit Reciprograte Stoker is designed to be utilized in the mass burning of refuse fuels. With this system, all of the refuse is burned directly on the grates with the burned out residue being discharged from the back end of the stoker. It requires no prior preparation of the refuse for burning.

1. Refuse Charging Hopper -- Refuse is brought from the storage pit to the charging hopper. The charging hopper extends across the width of the furnace.
2. Refuse Charging Throat -- Is an integral part of the refuse charging assembly and is either refractory lined or water cooled to protect it from the heat of the furnace and insure long service life.
3. Charging Ram -- Hydraulically operated ram feeder forces refuse uniformly into the furnace onto the first burning grate section. On larger stokers, multiple rams are used to provide continuous feed.
4. Grates -- Cast from a special high chrome/nickel alloy for long life, alternate rows of grates are moving or stationary. The moving grates reciprocate continuously over the stationary grates and push the refuse through the furnace.
5. Roller Bearings -- The grate frame is supported on rollers with tapered roller bearings to reduce friction and wear. The rollers and guide track are shielded from ash siftings.
6. Hydraulic Power Cylinders and Control Valves -- Are provided for each longitudinal grate section and feed ram allowing each to be individually driven and controlled by a solid state electronic controller. The cylinders are connected directly to the moving grate frame.
7. Vertical Drop Off -- Is lined with air admitting high chrome/nickel alloy tuyeres. The vertical drop-off is arranged between grate sections to provide break-up and reorientation of large compacted bundles of refuse.
8. Overfire Air Jets -- Strategically located to provide turbulence and mixing of the volatile gases to assure complete combustion.
9. Combustion Air -- Is fed to the underside of each grate section. Distribution of the air into the furnace is through closely and evenly spaced ports in the nose of the grate castings, providing uniform cooling to assure long grate life. Each section or module has a separate air supply to provide optimum control of air flow.
10. Automatic Sifting Removal System -- conveys siftings from underneath the ram and each grate section to the discharge end of the unit into the main residue conveyor or hopper. This siftings removal system provides automatic siftings discharge.