Comparison of NO<sub><em>x</em></sub> reduction among different coal combustion methods and the application of decoupling combustion

SHANG Xiao; GAO Shi-qiu; WANG Yin; DONG Li; XU Guang-wen; GUO Jing-hai

Volume 40 Issue 06

Jun. 2012

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Article Navigation > Journal of Fuel Chemistry and Technology > 2012 > 40(06): 672-679

SHANG Xiao, GAO Shi-qiu, WANG Yin, DONG Li, XU Guang-wen, GUO Jing-hai. Comparison of NOx reduction among different coal combustion methods and the application of decoupling combustion[J]. Journal of Fuel Chemistry and Technology, 2012, 40(06): 672-679.

Citation:

SHANG Xiao, GAO Shi-qiu, WANG Yin, DONG Li, XU Guang-wen, GUO Jing-hai. Comparison of NO_x reduction among different coal combustion methods and the application of decoupling combustion[J]. Journal of Fuel Chemistry and Technology, 2012, 40(06): 672-679.

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Comparison of NO_x reduction among different coal combustion methods and the application of decoupling combustion

1.
State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2.
School of Urban and Environmental Sciences, Northeast Normal University, Changchun 130024, China;
3.
School of Environmental and Biological Engineering, Jilin Institute of Chemical Technology, Jilin 132022, China

Received Date: 2011-08-28
Rev Recd Date: 2011-11-21
Publish Date: 2012-06-30

Abstract

Abstract

The reduction of NO_x emission via different coal combustion methods was studied in a two-stage reactor using 3 different coals. The NO_x formation is effectively suppressed by reburning the gas from pyrolysis and partial gasification of coal, making the NO_x emission obviously lower than that of the air-staged combustion. It is found that the decoupling combustion leads to the higher NO_x reduction rate, which is over 32% in comparison with the normal combustion. The NO_x reduction rates vary with the coal properties. The smaller the fuel ratio (fixed carbon to volatile matter)at per nitrogen content in coal, the lower NO_x emission is for reburning the combustible gas from pyrolysis and gasification and also for the decoupling combustion. The NO_x emission due to reburning the partial gasification gas varies with the oxygen amount applied in the gasification, and the lowest NO_x emission is realized in the oxygen concentration from 8% to 10%. A 1.4 MW industrial boiler was designed according to the principle of the decoupling combustion technology. The running data for the same coal show that the decoupling combustion reduces 32.9% NO_x emission in comparison with the traditional combustion.
- low-NO_x combustion,
- gas reburning,
- decoupling combustion,
- coal

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References(27)

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