Formation and Ultra-low Emission of NOx for Circulating Fluidized Bed Combustion

被引：0

作者：

Ke X. ^{[1
]}

Cai R. ^{[1
]}

Yang H. ^{[1
]}

Zhang M. ^{[1
]}

Zhang H. ^{[1
]}

Wu Y. ^{[1
]}

Lyu J. ^{[1
]}

Liu Q. ^{[1
]}

Li J. ^{[2
]}

机构：

[1] Department of Energy and Power Engineering, Tsinghua University, Haidian District, Beijing

[2] Shenhua Guoneng Group, Haidina District, Beijing

来源：

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2018年 / 38卷 / 02期

关键词：

Circulating fluidized bed; NO[!sub]x[!/sub; Practice; Ultra-low emission;

D O I：

10.13334/j.0258-8013.pcsee.171415

中图分类号：

学科分类号：

摘要：

Increasingly stringent environmental standards made higher demand on the original NOx emissions from circulating fluidized bed (CFB) boilers. Based on the deep understanding of the NOx formation and reduction process during CFB combustion, it is concerned that intensifying reducing atmosphere in different areas of furnace is the key to further excavate potential of original ultra-low NOx emission during CFB combustion. According to the relationship between gas-solid flow characteristics and reducing atmosphere in the furnace, a low NOx combustion technology route was proposed. The core methods are to decrease the average size of bed material and increase the solid circulation rate by improving the performance of recycling system. This technique has been verified in different CFB boilers. The results show that, by optimizing the design and operation of a CFB boiler, when the median particle size of fly ash is smaller than 12μm, the cut size (d90) is smaller than 54μm, the average diameter of bottom ash is smaller than 200μm, and the suspension solid concentration in dilute phase is higher than 5kg/m3, the original NOx emission can be significantly reduced and meet the requirement of ultra-low emission only through combustion control. It provides a more competitive direction for NOx treatment and low-cost pollution control of CFB boilers. © 2018 Chin. Soc. for Elec. Eng.

引用

页码：390 / 396

页数：6

共 31 条

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