Affiliation:
1. The University of Leeds, Leeds, UK
Abstract
The aim of this work was to show that a two-stage system of pilot and main burner could be used to extend the range of minimum to maximum power (turndown) under low NOx conditions. All the combustion air was admitted to the first stage where the natural gas fuel was split between the pilot and the main swirler. The main swirler was a counter-rotating radial swirler, with only the upstream passage fuelled, using a single point fuel injector on the centre of each radial vane passage inlet. Two pilot fuel injector locations were investigated: central radial outward injection and injection into the dump expansion recirculation zone. It was shown at 600K inlet temperature and atmospheric pressure, that with the central pilot fuelled at a constant 0.18 equivalence ratio the main fuel could be increased to 0.7 equivalence ratio with the NOx increasing from 4 to 6 ppm at 15% oxygen. The use of the outer dump expansion recirculation zone for the pilot resulted in excellent turndown, but higher NOx emissions than for the central pilot fuel injection. This gave a very compact low NOx combustor with a high turndown and no acoustic problems.
Publisher
American Society of Mechanical Engineers
Cited by
1 articles.
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