Abstract: A system for utilizing a fuel having a high ash content, water content in excess of 50% and large particles of combustibles is shown which includes a holding tank for the fuel. Fuel is circulated in the holding tank to maintain the consistency of the fuel and a metered portion is removed, strained and fed to a combustion device. The combustion device is a fire tube boiler for generating steam and includes a furnace tube insulated with refractory material extending for its entire length. The system mixes a preselected amount of atomized fuel with combustion air and natural gas. Special ash and particulate accumulation means are provided in the boiler. The boiler also has a water spraying system in its combustion chamber to reduce combustion temperature and increases water content of the combustion mixture based on the temperature of the combustion gases at the end of the furnace tube. Finally, when the boiler is shut off, the entire system, including a bypass system, may be purged by air or water.

Abstract: The dual cannister gas housing of the present invention permits combustion of two separate gases of different heating values for industrial applications. The housing includes a first annular chamber surrounding a combustion zone, the first chamber receiving a first gas. Holes in the inner wall of the chamber permit entry of the first gas into the combustion zone. A second chamber surrounds the first chamber and receives a second gas. Tubes connect the second chamber to the combustion zone, the tubes passing through the first chamber to prevent mixing of gas. The number and size of the tubes and holes are selected for each application to insure proper entry velocity and pressure drop for the first and second gases.