کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4992010 1457119 2017 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Combustion characteristics and NOx formation of a retrofitted low-volatile coal-fired 330 MW utility boiler under various loads with deep-air-staging
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Combustion characteristics and NOx formation of a retrofitted low-volatile coal-fired 330 MW utility boiler under various loads with deep-air-staging
چکیده انگلیسی
Investigations on the retrofitted low-volatile coal-fired 330 MW boiler were performed. Gas temperatures and concentrations, furnace temperatures, boiler efficiencies were measured under various loads. Under deep-air-staging, gas temperatures and their increasing rate are relatively high under various loads, ensuring that low-volatile coal is ignited in time. A decrease in boiler load decreases gas temperatures and their increasing rate, and results in a more distant ignition position. The O2 consumption rate decreases and variation amplitude of its consumption rate is not apparent. The concentrations of CO and NOx generated decrease. Under higher loads, the NOx formation first increase and then smoothly decline. Under decreasing load, the furnace temperature decreases slightly in the primary combustion region, and there is a larger decrease in the upper portion of the furnace. With decreasing load, NOx emissions decrease from 871.5 to 743.7 mg/m3 (6% O2). Compared with results before the retrofit, both exhaust gas temperature and unburned carbon decrease. After the retrofit, boiler efficiencies higher than 91% are achieved under various loads. Meanwhile, the mean NOx emissions decrease from 1271.6, 979.2, 988.0 to 822.4, 796.9, 743.7 mg/m3 (6% O2) under boiler load of 300, 230, and 150 MW, respectively. Numerical calculation results agree well with measured results.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Thermal Engineering - Volume 110, 5 January 2017, Pages 223-233
نویسندگان
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