Study on characteristics and emission in pulverized coal air-staged MILD combusting

被引：0

作者：

Han X. ^{[1
]}

Huang M. ^{[2
]}

Zhang Z. ^{[2
]}

Xu R. ^{[1
]}

机构：

[1] University of Chinese Academy of Sciences, Beijing

[2] Key Laboratory of Advanced Energy and Power, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing

来源：

Han, Xiang (hanxiang@iet.cn) | 1600年 / Chinese Academy of Sciences卷 / 47期

关键词：

Air-stage; Entrained furnace; MILD combustion; NO/CO emissions; Pulverized coal; Stage air coefficient; Stage air location;

D O I：

10.1360/N092016-00412

中图分类号：

学科分类号：

摘要：

Moderate & Intense Low-oxygen Dilution (MILD) combustion is a useful measure to reduce NOx, CO emission significantly. It also works well to reduce NOx in air-stage combustion. So we take air-stage MILD combustion as our study theme direction. The study was carried on a 0.3 MW/m3 large-scale laboratory entrained furnace whose radius is 500 mm and length is 3000 mm. The study content includes: flow distribution of the entrained furnace; effect on the temperature distribution and NOx, CO emission of the pulverized coal entrained furnace for different air-stage coefficient and stage air location. The main conclusions are as follows: NO emission firstly decreases and then increases as air-stage coefficient increases, CO emission decreases continuely; it is benefit to decrease NO emission but CO emission increases when air-stage location is close to the outlet. NO emission reaches only 139.8 mg/Nm3 when air-stage coefficient is 0.7 and stage air location is 2600 mm (all the emission value in this test for the NO and CO is converting to O2 concentration ϕ(O2)=9%). It slightly increases the carbon content in fly ash using air-stage combustion and combustion stability does not change significantly. © 2017, Science Press. All right reserved.

引用

页码：1256 / 1264

页数：8

共 15 条

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