combustion of corn stover bales in a small 146-kw boiler玉米秸秆的燃烧锅炉包在一个小146千瓦.pdfVIP

Energies 2011, 4, 1102-1111; doi:10.3390/en4071102 OPEN ACCESS energies ISSN 1996-1073 /journal/energies Article Combustion of Corn Stover Bales in a Small 146-kW Boiler René Morissette, Philippe Savoie * and Joey Villeneuve Agriculture and Agri-Food Canada, Soils and Crops Research and Development Centre, 2560 Hochelaga Blvd, Quebec City, QC G1V 2J3, Canada; E-Mails: rene.morissette@agr.gc.ca (R.M.); joeyvilleneuve@videotron.ca (J.V.) * Author to whom correspondence should be addressed; E-Mail: philippe.savoie@fsaa.ulaval.ca; Tel.: +1-418-657-7985 ext. 5166; Fax: +1-418-648-2402. Received: 1 June 2011; in revised form: 18 July 2011 / Accepted: 19 July 2011 / Published: 22 July 2011 Abstract: Spring harvested corn stover was used for direct combustion in a 146 kW dual chamber boiler designed for wood logs. Stover had a very low moisture content (6.83 ± 0.17%), a gross calorific value (GCV) of 18.57 MJ/kg of dry matter (±0.32 MJ/kg DM) and an ash content of 5.88% (±1.15%). Small stover bales (8.83 ± 0.90 kg) were placed manually in the upper combustion chamber at a rate of 10.5 to 12.8 kg/h over a 24-h period, with three replications, and compared to a control wood combustion trial (12.1 kg/h during 24 h). The overall heat transfer efficiency for stover was lower than for wood (57% vs. 77%). Stover bales produced on average 7.5% ash which included about 2% of unburned residues while wood produced 1