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Industrial Experiments on Anthracite Combustion and NOx Emissions with Respect to Swirling Secondary Air for a 300 MWe Deep-Air-Staged Down-Fired Utility Boiler
Energy & Fuels ( IF 5.2 ) Pub Date : 2018-06-21 00:00:00 , DOI: 10.1021/acs.energyfuels.8b01237
Qingxiang Wang 1 , Zhichao Chen 1 , Tao Liu 1 , Lingyan Zeng 1 , Xin Zhang 1 , He Du 1 , Zhengqi Li 1
Affiliation  

A new deep-air-staging and low-NOx technology has been introduced to a 300 MWe anthracite- and down-fired boiler with swirl burners. Industrial experiments were performed at different outer secondary air vane angles (defined as β) (i.e., 20°, 30°, 40°, and 50°) to evaluate the environmental and economic performance for the retrofitted boiler. Furthermore, combining with the previous investigations on the inner secondary air vane angle (defined as α), the influence degrees of β and α on anthracite combustion and NOx emissions for the retrofitted boiler were further analyzed and compared. The experimental results revealed that the main factors affecting the ignition and the flame fullness for β and α are different. Compared with α, β had a relatively greater influence on NOx emissions for the retrofitted boiler. Compared with the orignianl boiler, a strong reducing atmosphere was formed in the primary combustion zone for the retrofitted boiler, and for the β of approximately 30°, the arithmetic mean of NOx emissions in the whole measurement range was reduced by 1073 mg/m3 at 6% O2. Taking consideration of the environmental and economic effects, the optimal β for the retrofitted boiler was 20°.

中文翻译:

对无烟煤燃烧和NO的工业实验X排放量相对于二次旋流空气中300兆瓦Ë深空气分级向下煤粉锅炉

一种新的深空分期和低NO X技术已被引入到一个300兆瓦é anthracite-和向下烧制锅炉燃烧器的漩涡。在不同的外部二次风叶片角度(定义为β)(即20°,30°,40°和50°)上进行了工业实验,以评估翻新锅炉的环境和经济性能。此外,结合先前对内部二次风叶片角度(定义为α)的研究,β和α对无烟煤燃烧和NO x的影响程度进一步分析并比较了改装锅炉的排放。实验结果表明,影响β和α点火和火焰充满度的主要因素是不同的。与α相比,β对改装锅炉的NO x排放影响较大。与orignianl锅炉相比,形成在用于改型锅炉的初级燃烧区较强的还原性气氛,并且对于大约30的β°,NO的算术平均值X在整个测量范围内的排放量减少了1073毫克/米3在6%O 2下。考虑到环境和经济影响,改型锅炉的最佳β为20°。
更新日期:2018-06-21
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