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		Design of a Suspension Burner System for Forestry and Agricultural Residues (NRI)
			(introduction...)
			Acknowledgements
			Note
			Summaries
			Introduction
			Description of the unit
			Principle of operation
			Experimental programme
			Monitoring and analysis of data
			Results of experimental work
			Discussion of results
			Dual-chamber brick-built fornace
			Suspension burner/timber drying system
			Conclusions
			References
			Appendices

Principle of operation

A schematic diagram of the fuel/air flow is shown in Figure 2. The furnace is pre-heated by a small wood fire built on the floor of the combustion chamber. Sawdust is blown tangentially into the upper half of the furnace and the fuel/ air mixture follows a cyclonic path, spirals to the base of the furnace chamber, up through a vortex and out via a duct located at the top of the furnace. The fuel rapidly oxidizes and the majority of ash residue is carried out of the furnace by the flow of combusted gases and excess air.

Figure 2 Fuel/air flow through the furnace

The hottest region of the furnace is approximately 1000°C. The flue gases pass through the heat exchanger, raising the cooling air temperature by approximately 60°C. The flue gases exit the heat exchanger at approximately 250°C.