Quarterly report July 1 - September 30, 1999 [Development of METHANE de-NOX{reg_sign} reburning process]
The use of biomass and wood waste solids and sludges as fuel is often hampered by their low heating values and the presence of bound nitrogen that result in inefficient combustion and high NOx emissions. Cofiring supplemental fuel through auxiliary burners helps with improving the combustion effectiveness and NOx reduction, but the benefits are limited to the fractional heat input of the auxiliary fuel. IGT has developed a recess called METHANE de-NOX{reg_sign} , which has shown substantially greater economic, energy and environmental benefits than traditional cofiring methods in demonstrations with both MSW- and coal-fired stoker boilers. In this process, auxiliary fuel such as natural gas or oil is injected directly into the lower region of the primary flame zone just above the grate. This increases and stabilizes the average combustion temperature, which improves combustion of high-moisture fuels, provides more uniform temperature profiles and reduced peak temperature, and reduces the availability of oxygen to reduce NOx formation. This is in contrast to conventional reburning, where natural gas is injected above the primary combustion zone after the majority of NOx has already been formed.
- Research Organization:
- Institute of Gas Technology (US)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EE) (US)
- DOE Contract Number:
- FC36-99GO10418
- OSTI ID:
- 763160
- Report Number(s):
- DOE/GO/10418-Q
- Country of Publication:
- United States
- Language:
- English
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