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    Important role of volatile-char interactions in enhancing PM1 emission during the combustion of volatiles from biosolid

    Access Status
    Fulltext not available
    Authors
    Chen, Xujun
    Liaw, Sui Boon
    Wu, Hongwei
    Date
    2017
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Chen, X. and Liaw, S.B. and Wu, H. 2017. Important role of volatile-char interactions in enhancing PM1 emission during the combustion of volatiles from biosolid. Combustion and Flame. 182: pp. 90-101.
    Source Title
    Combustion and Flame
    DOI
    10.1016/j.combustflame.2017.04.005
    Additional URLs
    http://www.sciencedirect.com/science/article/pii/S0010218017301323
    ISSN
    0010-2180
    School
    Department of Chemical Engineering
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP150104486
    URI
    http://hdl.handle.net/20.500.11937/58409
    Collection
    • Curtin Research Publications
    Abstract

    Abstract A three-stage pyrolysis/combustion reactor was used to demonstrate the importance of volatile–char interactions in inorganic particulate matter (PM) emission from the combustion of biosolid volatiles. It consists of a two-stage quartz reactor (including an inner drop-tube/fixed-bed pyrolyser as Stage I and an outer fixed-bed as Stage II) cascaded into a large drop-tube furnace (DTF, Stage III). The unique reactor design enables the volatiles that are produced in situ from the fast pyrolysis of cellulose, polyethylene or acid-washed biosolid in Stage I to pass through a preloaded bed of slow-pyrolysis biosolid char in Stage II then be immediately combusted (achieving complete combustion) in the DTF as Stage III at 1300 °C. Limited by quartz maximum working temperature (in Stages I and II), two temperatures (800 or 1000 °C) were considered for preparing the bed of char and generating the in situ volatiles. The results clearly show that volatile–char interactions lead to significant changes in the particle size distributions (PSDs) of PM emitted from the combustion of volatiles produced in situ from cellulose, polyethylene or acid-washed biosolid pyrolysis. The volatile–char interactions increase the yield of PM1 (i.e. PM with aerodynamic diameter <1 µm), dominantly PM0.1 (i.e. PM with aerodynamic diameter <0.1 µm). The results show that small non-oxygenated reactive species (especially H free radicals) in the fresh volatiles can react with the chars to enhance the release of alkalis (Na and K) as well as P and S in the chars. The released Na, K, P and S can react to form alkali metaphosphate and sulphate which subsequently form PM1 during volatiles combustion. It is also evident that volatile–char interactions convert some of Pb and Cr in the biosolid chars into volatile forms which are released and then contribute to PM1 emission.

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      © 2018 The Combustion Institute This study reports the significant effect of volatile–char interactions on the emission of particulate matter (PM) during the combustion of biosolid chars in drop-tube furnace at 1300 °C ...
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      © 2016 American Chemical Society.This paper presents a systematic study on the emission of trace elements (e.g., As, Cu, Cr, Ni, V, Co, Cd, and Pb) during the combustion of char, volatiles, and biosolid at 1300 °C using ...
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      Chen, X.; Wu, Hongwei (2018)
      © 2018 The Combustion Institute. This study reports the roles of volatiles with distinctly-different chemistry in determining char reactivity and char structure during in situ volatile-char interactions under non-catalytic ...
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