Decoupled combustion of alcohol extracted herb residues with blending wasted activated coke: Insight into in-situ NOx emission control by pyrolysis products

Wenyan Wang, Xuan Liu, Guangyi Zhang, Xinyu Zhu, Bowen Shi, Jianling Zhang and Guangwen Xu

Applied Energy, 2022, vol. 323, issue C, No S0306261922008285

Abstract: By a self-established dual fluidized bed combustion apparatus, alcohol extracted herb residues (AEHRs), as well as their derived char and on-line volatiles, were firstly directly combusted to investigate and compare the characteristics of the resulting NOx emissions; and then, the AEHRs were subjected to decoupled combustion (DC) with addition of wasted activated coke (WAC), to realize their safe disposal/clean energy recovery. The result showed that, the DC exhibited a desirable NOx reduction effect, and the on-line volatiles, especially those from pyrolysis at 600 ℃, played a crucial role in the in-situ NOx control. The WAC inhibited NOx formation, due to its lower ash content and containing significantly fewer light metals (mainly K and Mg) than the AEHR char. When subjected to DC at the optimized conditions (600 °C pyrolysis, 850 °C combustion, excessive air ratio (ER) = 1.3 and secondary air proportion = 0.5), blending 20% WAC into the AEHR further reduced the NOx emission concentration from 217.03 to 163.82 mg m−3, corresponding to a 70.40% NOx reduction rate when compared to 553.41 mg m−3 for conventional combustion of the AEHR. Splitting the primary air revealed that the char + WAC contributed 18.81–26.51% of the total NOx reduction amount during the AEHR + WAC DC, justifying the necessity for DC to simultaneously make good use of the hot char and the on-line volatiles for reducing NOx.

Keywords: Alcohol extracted herb residue (AEHR); Decoupled combustion; Dual fluidized bed; Nitrogen oxides (NOx); In-situ nitrogen control (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1016/j.apenergy.2022.119505

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