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首页> 美国政府科技报告 >Effect of Coal Particle Size and Gun Design on NOx Reduction Using an Aerodynamically Air Staged Burner. Report on the CC 2-2 Trials
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Effect of Coal Particle Size and Gun Design on NOx Reduction Using an Aerodynamically Air Staged Burner. Report on the CC 2-2 Trials

机译：煤颗粒尺寸和喷枪设计对空气动力空气分级燃烧器NOx还原的影响。关于CC 2-2试验的报告

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A series of experimental burner design studies have been conducted within the IEA Coal Combustion Sciences Program at the IFRF. The AP 14 an AP 16 trials were used to develop an aerodynamically air staged burner (AASB). An understanding of the complex aerodynamic behavior associated with effective NOx control using internal air staging was developed. The NOx emission using the AASB was approximately 320 ppm at optimized operating conditions with a burnout of 98%. A more detailed investigation of the AASB was recommended at temperature/time conditions which closely stimulated a utility boiler. The investigation of the temperature/time history of Furnace no. 1 is the subject of the first part of the CC 2 (CC 2-1) trial. The particle size distribution of the coal was varied in the CC 2-2 trial to determine its effect on carbon burnout and NOx reduction. The primary objectives of the CC 2-2 trial was to determine the effect of particle size distribution on NOx reduction and carbon burnout using the AASB. The secondary objective was to compare the performance of the oblique injection coal gun with the more standard annular injection coal gun. The coal particle size distribution did not have a significant effect on the NOx reduction using an AASB with an annular coal gun. A minimum NOx emission of 550 ppm was obtained and the carbon in ash at this condition was 5%. The oblique coal gun was superior to the annular coal gun for NOx reduction. In general, the NOx emissions were 45 ppm lower firing the fine grind coal than firing normal grind coal. The effects of coal grind and coal gun position were successfully explained in terms of the interaction of the coal particles with the flame internal recirculation zone. 17 figs., 8 refs., 5 tabs. (ERA citation 14:014262)

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