Abstract
The swirl burner with a prechamber was used in a 14 MW pulverized-coal combustion experiment to investigate the influence of inner and secondary air ratios (ISA/OSA) on the combustion characteristic and flame shape in this work. The temperatures and species concentrations in the prechamber were measured via the flue gas analyzer and thermocouples. The flame shape beyond the prechamber outlet was captured by using a high-speed camera. The results showed that the combustion efficiency was increased and low nitrogen combustion was achieved by adopting the swirl burner with a prechamber. The high temperature corrosion and slagging phenomenon did not occur in the prechamber. The influence of ISA/OSA on temperature and species concentration profiles at different areas in the prechamber was different. The flame shape size exhibited an inflection point with increasing ISA/OSA. Considering, comprehensively, the temperature peak, near wall temperature, oxygen-free zone, CO concentration, flame length, flame diameter, and divergence angle, the case of ISA/OSA =1 : 2 had great processing on combustion efficiency and NOx emission. Thus, ISA/OSA = 1 : 2 was selected as the optimized case under experiment conditions.
Highlights
Pulverized-coal (PC) combustion is one of the maximum coal application approaches
Combining with the abovementioned technologies, the swirl burner has the ability of improving the combustion efficiency and achieving low nitrogen combustion
Zhou et al [9] numerically analyzed that flame stability and the NOx formation mechanism depend on the flow and combustion characteristic of the swirl burner (HT-NR3). us, the influences of the swirl burner different variable on PC combustion were investigated by the flow and combustion characteristic
Summary
E swirl burner with a prechamber was used in a 14 MW pulverized-coal combustion experiment to investigate the influence of inner and secondary air ratios (ISA/OSA) on the combustion characteristic and flame shape in this work. E temperatures and species concentrations in the prechamber were measured via the flue gas analyzer and thermocouples. E flame shape beyond the prechamber outlet was captured by using a high-speed camera. E results showed that the combustion efficiency was increased and low nitrogen combustion was achieved by adopting the swirl burner with a prechamber. E high temperature corrosion and slagging phenomenon did not occur in the prechamber. E influence of ISA/OSA on temperature and species concentration profiles at different areas in the prechamber was different. E flame shape size exhibited an inflection point with increasing ISA/ OSA. Considering, comprehensively, the temperature peak, near wall temperature, oxygen-free zone, CO concentration, flame length, flame diameter, and divergence angle, the case of ISA/OSA 1 : 2 had great processing on combustion efficiency and NOx emission. us, ISA/OSA 1 : 2 was selected as the optimized case under experiment conditions
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