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Tar from pilot scale co-pyrolysis of biological dairy sludge and spruce wood chips

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dc.contributor.author Horvat, Alen
dc.contributor.author Kwapinska, Marzena
dc.contributor.author Leahy, James J.
dc.date.accessioned 2019-03-27T14:57:36Z
dc.date.available 2019-03-27T14:57:36Z
dc.date.issued 2019
dc.identifier.uri http://hdl.handle.net/10344/7728
dc.description peer-reviewed en_US
dc.description.abstract A pilot scale investigation of co-pyrolysis of biological dairy sludge and spruce wood chips and pyrolysis of spruce wood chips solely was carried out. Pyrolysis was tested as a waste treatment method aiming to reduce the volume of dairy sludge while producing a pyrolysis gas suitable for an internal combustion engine. Pyrolysis tests were carried out in a continuously fed, pilot scale rotating retort type of facility in the temperature range between 700 and 770 °C. Feedstock feeding rates were between 40.9 – 68.6 kgd.a.f. h-1. Tar yields and composition was measured by means of the solid phase adsorption method in order to assess gas quality with regard to the specified tar limits given for downstream applications. The yields of total gas chromatography detectable tar produced from the dairy sludge and spruce wood chips blend was in the range between 7.25 - 10.98 gtotal tar Nm-3 dry raw gas, while spruce wood chips solely produced yields between 11.18 - 13.31 gtotal tar Nm-3 dry raw gas. Composition wise, the main difference was a number of nitrogen-containing tar compounds reflecting the high nitrogen content in dairy sludge feedstock with 2-butenenitrile, pyridine and 1H-pyrrole being the most abundant nitrogen-containing tar compounds. Raw pyrolysis gas from the two feedstocks tested did not meet the requirements regarding tar limits given in the manufacturer’s specification for their internal combustion engine. The raw pyrolysis gas contained excessive amounts of 3 and 4+ aromatic ring tars. Therefore tar removal is required prior to combustion in the engine. The proposed tar removal strategy includes a thermal tar reformer using air as a reforming agent followed by adsorption using wood chips, or in-process generated bio-char, or torrefied biomass as a viable adsorbent. en_US
dc.language.iso eng en_US
dc.publisher Elsevier en_US
dc.relation 12RC2302 en_US
dc.relation.ispartofseries Energy Procedia;161, pp. 66-74
dc.relation.requires https://doi.org/10.1016/j.egypro.2019.02.059
dc.subject dairy processing sludge en_US
dc.subject waste treatment en_US
dc.subject pyrolysis en_US
dc.subject tar en_US
dc.title Tar from pilot scale co-pyrolysis of biological dairy sludge and spruce wood chips en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.1016/j.egypro.2019.02.059
dc.contributor.sponsor SFI en_US
dc.relation.projectid 12/RC/2302 en_US
dc.relation.projectid 16/SP/3829 en_US
dc.relation.projectid TC/2014/0016 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US


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