Mechanical Engineering Journal
Online ISSN : 2187-9745
ISSN-L : 2187-9745
Evolving Power and Energy Systems
Multiple-injection dry low-NOx combustor for hydrogen-rich syngas fuel: testing and evaluation of performance in an IGCC pilot plant
Tomohiro ASAISatoshi DODOMitsuhiro KARISHUKUNobuo YAGIYasuhiro AKIYAMAAkinori HAYASHI
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2014 Volume 1 Issue 5 Pages TEP0044

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Abstract

The successful development of oxygen-blown integrated coal gasification combined cycle (IGCC) technology requires gas turbines capable of achieving the dry low nitrogen oxides (NOx) combustion of hydrogen-rich syngas for low emissions and high plant efficiency. The authors have been developing a “multiple-injection burner” to achieve the dry low-NOx combustion of hydrogen-rich syngas. This burner consists of multiple fuel nozzles and a perforated plate with multiple air holes. At each injection point, one fuel nozzle and one air hole are installed coaxially, so that a fuel jet surrounded by a sheath air jet is injected. The burner achieves low-NOx combustion by mixing fuel and air rapidly with multiple fuel-air coaxial jets, and prevents flashback into the burner by lifting the flame from itself. The purpose of this paper is to present the test results of multi-can combustors equipped with multiple-injection burners in an IGCC pilot plant, and evaluate combustor performance by focusing on the effects of flame shapes. The syngas fuel produced in the plant contained approximately 50% carbon monoxide, 20% hydrogen, and 20% nitrogen by volume. In the tests, the combustor with slenderer flames achieved lower NOx emissions of 10.9 ppm (at 15% oxygen) diluent-free with high stability and high reliability, and reduced both combustor liner and burner plate metal temperatures at the maximum gas turbine load. These findings demonstrated that the multiple-injection combustor achieved the dry low-NOx combustion of the syngas fuel in the plant.

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© 2014 The Japan Society of Mechanical Engineers
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