کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4991243 1457104 2017 34 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of outer secondary air vane angles on combustion characteristics and NOx emissions for centrally fuel rich swirl burner in a 600-MWe wall-fired pulverized-coal utility boiler
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Effect of outer secondary air vane angles on combustion characteristics and NOx emissions for centrally fuel rich swirl burner in a 600-MWe wall-fired pulverized-coal utility boiler
چکیده انگلیسی
To solve the high NOx emissions associated with a 600 MWe utility boiler with enhanced-ignition axial control low NOx (EI-XCL) burners, continuous improvement of the previously proposed centrally fuel-rich (CFR) burner technology lies on three aspects: (1) the 36 EI-XCL burners in the original furnace were retrofitted with CFR burners; (2) the 26 over fire air (OFA) ports in two layers have been added above the burners along the top row of the furnace; (3) the designed OFA ratio was 25%. Industrial-size measurements (i.e., adjusting outer secondary air vane angle of 20-30°) uncovered that, compared with the prior EI-XCL burners, the CFR burner exhibited the same good ignition performance and the O2 concentrations near the side walls were found to be above 6% when the secondary air mass flow rate of the burner decreases about 37% for all three outer secondary air vane angles. The NOx emissions decrease from 316 to 237 mg/m3 (O2 = 6%) when outer secondary air vane angle varies from 20° to 30°. Under the optimal outer secondary air vane angle, NOx emissions were found to decrease by 60.50% at a load of 600 MWe subsequent to retrofitting of the boiler.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Thermal Engineering - Volume 125, October 2017, Pages 951-962
نویسندگان
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