Chapter 21. Development of a Low NOx Method of Gas Firing
- John B. Wachtman Jr.
Published Online: 26 MAR 2008
Copyright © 1991 The American Ceramic Society, Inc.
Proceedings of the 51st Conference on Glass Problems: Ceramic Engineering and Science Proceedings, Volume 12, Issue 3/4
How to Cite
Neff, G. C., Joshi, M. L., Tester, M. E. and Panahi, S. K. (1991) Development of a Low NOx Method of Gas Firing, in Proceedings of the 51st Conference on Glass Problems: Ceramic Engineering and Science Proceedings, Volume 12, Issue 3/4 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313237.ch21
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1991
Print ISBN: 9780470374986
Online ISBN: 9780470313237
- carbon-hydrogen ratio
An improved method of gas firing on a glass furnace and reduced NOx emissions is outlined. This technique involves the use of a natural gas “cracker”* for NOx reduction. The cracker method of gas firing takes about 25% of the furnace natural gas consumption through a separate cracker to produce soot particles. This is then reblended with the balance of 75% of gas, producing a “soot-rich” gas mixture. The combustion of soot-rich gas produces flame with increased luminosity and lower peak flame temperature characteristics. It is shown that each 100°F decrease in either peak flame temperature or furnace wall temperature decreased NOx emission by 20–25%. Past, current, and future plans involving the cracker program are discussed. Current experiments on a pilot unit were successful in producing a soot-rich gas mixture with the soot concentration of 0.0025 Ib carbon/ft3 of natural gas supplied as a fuel to the furnace. Strictly on the weight basis, it is expected that approximately 8% of the fuel will form a soot cloud. The emitlance of soot clouds of this concentration is about 0.6 and conform a surface which is more capable of radiating than the gaseous components (H2O and CO2). The highly luminous flame is expected to radiate heat more efficiently, operate at a lower peak temperature, and reduce thermal NOx emissions by 35% or more.