Search citation statements
Paper Sections
Citation Types
Year Published
Publication Types
Relationship
Authors
Journals
The recuperative burner and the regenerative burner that applied exhaust heat recirculation are proposed as energy-saving technology in furnaces in a practical use. Although, heating efficiency has the proportional to the rate of the exhaust heat recirculation, the burned gas temperature and NO x emission increases in the conditions of high exhaust heat recirculation. The newly developed two-stage combustion method was proposed in this research for improving NO x reduction. The two-stage combustion method is often applied as low NO x technology with using exhaust heat recirculation. This research proposed a tubular flame for the first stage of two-stage combustion. Since the tubular flame can sustain a stable premixed flame in rich mixture in the first stage, NO x generated in the primary burner suppresses due to low flame temperature in this proposed system. In addition, the inlet gas temperature in the secondary burner can be adjusted by intermediate cooling section that placed between the primary burner and secondary burner. This reduction of the inlet gas temperature is also contributed to reduction of NO x in the secondary burner. Results show that the first flame was successfully formed until equivalence ratio 1.7 by using tubular flame in the primary burner. The smallest NO x emission appeared in the condition that the adiabatic flame temperature become equilibrium to the amount of heat reduction calculated from the intermediate cooling section. The NO x emission is reduced to 16.3 ppm (O 2 =0%) at the equivalence ratio of 1.67 in the primary burner without intermediate cooling tube. This value is about 1/6 of the single-stage combustion with Bunsen flame, and about 1/4 of the two-stage combustion with partially premixed flame in the primary burner.
The recuperative burner and the regenerative burner that applied exhaust heat recirculation are proposed as energy-saving technology in furnaces in a practical use. Although, heating efficiency has the proportional to the rate of the exhaust heat recirculation, the burned gas temperature and NO x emission increases in the conditions of high exhaust heat recirculation. The newly developed two-stage combustion method was proposed in this research for improving NO x reduction. The two-stage combustion method is often applied as low NO x technology with using exhaust heat recirculation. This research proposed a tubular flame for the first stage of two-stage combustion. Since the tubular flame can sustain a stable premixed flame in rich mixture in the first stage, NO x generated in the primary burner suppresses due to low flame temperature in this proposed system. In addition, the inlet gas temperature in the secondary burner can be adjusted by intermediate cooling section that placed between the primary burner and secondary burner. This reduction of the inlet gas temperature is also contributed to reduction of NO x in the secondary burner. Results show that the first flame was successfully formed until equivalence ratio 1.7 by using tubular flame in the primary burner. The smallest NO x emission appeared in the condition that the adiabatic flame temperature become equilibrium to the amount of heat reduction calculated from the intermediate cooling section. The NO x emission is reduced to 16.3 ppm (O 2 =0%) at the equivalence ratio of 1.67 in the primary burner without intermediate cooling tube. This value is about 1/6 of the single-stage combustion with Bunsen flame, and about 1/4 of the two-stage combustion with partially premixed flame in the primary burner.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.