Excellent visual access for observation of the combustion zone. The pilot-scale grate facility is shown schematically in Figure 10. The furnace consists of seven vertical sections and one exhaust section. The total height is 10.5 feet and the grate area has a one square foot grate. The base of the furnace provides support and houses the ash drawer.
Air is injected under the grate and at various heights above the grate.
Ports vertically located along the furnace allow for the addition of fuel and air for secondary burning. Solid fuels can be fed from the hopper via a metering auger to a rotating multi-vane spreader. All of the furnace sections contain multiple ports for sample extraction, observations, and overfire air or natural gas injection. Burner Designs REI has experience designing complex, multi-fuel fired burners. Figure 11 shows an example of a ultra low NOx pulverized coal fired burner.