The Hefler system uses thermal gasification, which produces heat, electricity and water vapor. The only by-product is ash (mineral). The thermal gasification of solid fuels can be characterized by the following significant phases:
The process operates under a slight negative pressure created by the induced draft (ID) fan. The fan is located before the gas stack and draws the hot flue gasses from the gasification zone into the final combustion zone then through the boiler and gas handling and cleaning equipment.
As the hot gasses pass through the boiler, the energy recovery phase of the gasification system converts the thermal energy in the hot gasses into steam.
The flue gas temperature exiting the boiler is typically in the range of 180 to 250 F. The result of these individual processes is a controlled and efficient conversion of biomass into thermal heat that is transformed in the boiler to steam. This minimizes emissions as the emissions are double burned to achieve a clean stack.
The only thing left to vent to the atmosphere is low pressure steam and heat. The waste heat and steam will run the kiln, displacing diesel fuel. It can also be used for other activities such as a thermal wood oven.