A novel coal purification-combustion system: Purification and combustion characteristics

Shaobo Han, Qiangqiang Ren, Shaobo Yang, Ruifang Cui, Yujie Hu and Chi Zhang

Energy, 2025, vol. 323, issue C

Abstract: The purification-combustion concept of activating coal and separating impurities at high temperatures to achieve directional element conversion and impurity removal in fuel was proposed to better adapt to energy structure development and reduce pollution emissions during coal power generation. The purification and combustion of Shenmu coal in a 200 kW purification-combustion test platform were characterized, and the effect of the equivalence ratio of the high-temperature reduction unit (λ2) was analyzed. The platform maintained steady temperature distribution during operation. The C, H, N conversion rates improved significantly after purification compared to traditional methods. Improving λ2 increased the C conversion rate, but little affected H and N conversion. The concentrations of CO, H2 and CO2 rose after purification, while the CH4 concentration remained extremely low. NOx emission decreased with the decline of λ2 and reached 65 mg/m3, and 3.21 % of the fuel-N was transferred to NOx at λ2 = 0.33. The proportions of N2O and NO2 were larger at the top of the burner. After that, the reductive atmosphere was weakened and NO emerged. Hence, the new purification-combustion system is suitable for the current development of the coal industry.

Keywords: Purification; Mild combustion; Coal; NOx emission; Melt gasification (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:323:y:2025:i:c:s0360544225015397

DOI: 10.1016/j.energy.2025.135897

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