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US 5,893,358 AGranted
Pellet fuel burner for heating and drying systems
AssigneePyro Industries, Inc.
InventorOliver J. Whitfield
Life of this patent
Estimating the term…
Abstract
A pellet fuel burner includes a compact thermally insulated firebox for providing hot gases to a boiler, furnace or dryer. The apparatus includes a grate that includes a reciprocating arm for removing clinkers and ash from the grate. Pellet fuel feed is provided by a hopper that is isolated from the firebox by an airlock. A combustion air manifold is provided around the firebox to preheat primary and secondary combustion air.
Claims12
An apparatus fueled by pelletized fuel for producing thermal energy in the form of hot gas comprising:
- a firebox comprising a shell of refractory material having an inlet, an outlet, a baffle between the inlet and the outlet, an exterior surface and an interior surface, the shell and the baffle cooperating to define an internal gas pathway;
- a thermal shell comprising a thermal insulating material contacting the exterior surface and substantially surrounding the firebox;
- a grate located adjacent the inlet where pelletized fuel is combusted;
- a fuel feed conduit for delivering the pelletized fuel to the inlet;
- and
- a combustion air manifold surrounding the thermal shell for delivering combustion air from a combustion air source around the thermal shell to the grate, the combustion air being heated as it passes from the combustion air source to the grate.
3 more elements
Dependencies are inferred from the claim text.