Combustion and reaction

Influence of Operating Parameters on NOx and SO2 Emissions in Circulating Fluidized Bed with Post-Combustion

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  • 1. School of Engineering Science, University of Science & Technology of China, Hefei 230026, China
    2. Institute of Engineering Thermophysics, Chinese Academy of Science, Beijing 100190, China
    3. University of Chinese Academy of Science, Beijing 100049, China
    4. Dalian National Laboratory for Clean Energy, Dalian 116023, China

Online published: 2023-10-24

Supported by

This work was financially supported by Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA21040100).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

Abstract

Post-combustion technology of circulating fluidized bed can largely reduce the emission of nitrogen oxides (NOx) in the process of combustion and succeed in meeting the ultra-low NOx standard for some fuels like Shenmu coal. Exploring the potential of synergistic control of the emissions of NOx and sulphur dioxide (SO2) under post-combustion technology has become a direction that needs further study. The experiments were conducted on a 0.1 MW (thermal) circulating fluidized bed (CFB) test platform, composed of a CFB main combustor and post-combustion chamber (PCC). The paper focuses on the effects of air distribution ratio and temperature in CFB and limestone addition on NOx and SO2 emissions. The experimental results showed that compared with traditional CFB combustion, post-combustion technology can reduce NOx emission largely, but lead to a slight increase in SO2 emission. The higher SO2 emissions at post-combustion can lead to less NOx emission. With the decrease in λCFB, NOx emission first decreased and then increased; by contrast, SO2 emission with λCFB first increased and then decreased. Under post-combustion, when λCFB was 0.9, NOx emission was the minimum, while the SO2 emission was the largest. Combustion temperature and limestone addition has less adverse effects on NOx emission under post-combustion, compared with traditional CFB combustion. Limestone injection into the furnace is applicable under post-combustion, and the sulfur removal efficiency under post-combustion is very high, almost equivalent to that under traditional combustion.

Cite this article

WANG Chao, SONG Guoliang, CHEN Rui, JIANG Yu, LYU Qinggang . Influence of Operating Parameters on NOx and SO2 Emissions in Circulating Fluidized Bed with Post-Combustion[J]. Journal of Thermal Science, 2023 , 32(5) : 1858 -1867 . DOI: 10.1007/s11630-023-1856-1

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