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Show • Ultra-low combustion emissions, CO less than 30 vppm and NOx from 1 to 12 vppm (all corrected to 0% 02) • Excellent flame stability for combustion of very lean or low heating value gas mixtures. Therefore, the gas-fired porous radiant burner has shown great potential for a variety of infrared heating applications. Although the unique performance of the porous radiant burner has been demonstrated, there is a need to further investigate some unanswered questions for promoting this technology toward applications. Both theoretical and experimental studies are suggested to explore the mechanism of the interactive combustion and heat and mass transfer in the porous media, a basis of flame stability. Since flame stability and combustion locations are strongly dependent on operating conditions, the existing steady-state mathematical model needs to be developed to a time-dependent model. The assumption of the fixed flame location is not valid to analyze the interaction of combustion and heat and mass transfer in the porous media. Effects of material (physical properties and form) constructed of the porous bed, and burner configuration on the mechanism of flame stability and burner performance also need to be further investigated. The work described in this paper was not funded by the U.S. Environmental Protection Agency and therefore the contents do not necessarily reflect the views of the Agency and no official endorsement should be inferred. REFERENCES 1. Echigo, R. Effective energy conversion method between gas enthalpy and thermal radiation and application to industrial furnace. In: Proceedings of the 7th Int. Heat Transfer Conference, Munchen, Germany, Vol. 6: 1982. 2. Echigo, R., Kurusu, M., Ichimiya, K. and Yoshizawa, Y. Combus tion augmentation of extremely low calorific gases (application of the effective energy conversion method from gas enthalpy to thermal radiation) . In: Proceedings of 1983 ASME/JSME Thermal Engineering Joint Conference, Honolulu, Hawaii, Vol. IV: 1983. 3. Hemsath, K.M. Application and development of a porous wall burner. Final Report, Indugas, Inc., Toledo, Ohio. June 1986. |