Chapter 11. Low-NOx, Burner for Glass-Melting Furnaces—The Hi-Rad Burner
- John B. Wachtman Jr
Published Online: 26 MAR 2008
Copyright © 1993 The American Ceramic Society
A Collection of Papers Presented at the 53nd Conference on Glass Problems: Ceramic Engineering and Science Proceedings, Volume 14, Issue 3/4
How to Cite
Chu, E. K., Dehne, H., Joshi, M. L. and Gemmer, R. (1993) Low-NOx, Burner for Glass-Melting Furnaces—The Hi-Rad Burner, in A Collection of Papers Presented at the 53nd Conference on Glass Problems: Ceramic Engineering and Science Proceedings, Volume 14, Issue 3/4 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314098.ch11
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1993
Print ISBN: 9780470375242
Online ISBN: 9780470314098
An attractive retrofit combustion technology for improved furnace efficiency and reduced NOx emissions, using hi-rad burners for existing regenerative glass-melting furnaces, is being analyzed in a current project for the Gas Research Institute (GRI). In hi-rad burners, the carbon seed particles required for enhanced flame luminosity are generated by pyrolyzing a small fraction of the natural gas flow in a plasma arc. Previous GRI studies have shown an increase in the peak radiative heat flux of an natural gas flame of up to three times that of the nonplasma case, along with a reduction in NOx, emisswns. NOx, reduction is most likely due to radiative flame cooling. In this paper, the economic viability and NOx, emissions reduction potential of the hi-rad burner are assessed.
As discussed in this paper, the viability of the hi-rad burner was assessed through evaluating the cost-effectiveness of achieving enhanced radiant output and reduced NOx, emissions. The additional electricity consumed by the hi-rad burner can be justified depending on the level of increase in the radiant output of the hi-rad burner vs the electricity-to-natural-gas cost ratio, and the present NOx, control cost for glass melters. Electric boost as a means for NOx, control was used as a baseline for this assessment. The assessment results concluded that the hi-rad burner would be cost-effective over a broad range of electricity-to-natural-gas cost ratios if the amount of electricity consumption for enhanced radiant output is limited to less than 10% of the total natural gas energy input.
This paper also discusses the NOx, reduction potential and the hi-rad burner design requirements, including electrode designs, fuel delivery, burner physical dimensions, cooling methods, flame characteristics, turndown ratio, firing configurations, and material compatibility with regard to the glass melting process and common melter designs. The potential for commercializing the hi-rad burner is discussed as well.