Influences of coal size and coal-feeding location in co-firing with rice husks on performance of a short-combustion-chamber fluidized-bed combustor (SFBC)

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Author listMadhiyanon T., Sathitruangsak P., Soponronnarit S.

PublisherElsevier

Publication year2011

JournalFuel Processing Technology (0378-3820)

Volume number92

Issue number3

Start page462

End page470

Number of pages9

ISSN0378-3820

eISSN1873-7188

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-78751644298&doi=10.1016%2fj.fuproc.2010.10.013&partnerID=40&md5=e07f181a9893b0801cc59eb9b7627ca3

LanguagesEnglish-Great Britain (EN-GB)


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Abstract

This study examined the combustion characteristics and performance of rice husks co-fired with coal in a short-combustion-chamber fluidized-bed combustor (SFBC) with a 225 kWth capacity. Rice husks were the main fuel, and coal was a supplementary fuel in the experiments. The effects of coal size (< 5 mm and 5-10 mm) and coal-feed location (above or below a recirculating ring) on combustion performance were investigated. Various co-combustion tests of rice husks with coal were performed, with different thermal percentages (10, 15, 20, and 25%) of coal. The results were compared to firing 100% rice husks alone. With the assistance of a stirring blade and a recirculating ring, good combustion was feasible without using any inert materials mixed into the bed. Combustion efficiency in an excess of 98% was readily achievable. CO and SO 2 emissions (at 6% O2) were in the range 64-104 and 10-22 ppm, respectively, while NOx emissions were in the range of 208-281 ppm. Although the CO and SO2 emissions were acceptable, combustion of 100% rice husks and co-combustion with < 20% coal failed to comply with Thai NOx emission limits. Therefore, to minimize NOx emissions (208-244 ppm, at 6% O2), coal of both sizes was introduced below the recirculating ring. The results demonstrated that the thermal percentage of coal in the fuel mixture should be 20-25%. ฉ 2010 Elsevier B.V. All rights reserved.


Keywords

Rice husks


Last updated on 2023-03-10 at 07:35