Fluidized bed co-combustion of hydrothermally treated paper sludge with two coals of different rank

被引:34
|
作者
Areeprasert, Chinnathan [1 ,2 ]
Scala, Fabrizio [3 ]
Coppola, Antonio [4 ]
Urciuolo, Massimo [4 ]
Chirone, Riccardo [4 ]
Chanyavanich, Prut [1 ,5 ]
Yoshikawa, Kunio [1 ]
机构
[1] Tokyo Inst Technol, Dept Environm Sci & Technol, Midori Ku, G5-8,4259 Nagatsuta Cho, Yokohama, Kanagawa 2268503, Japan
[2] Kasetsart Univ, Fac Engn, Dept Mech Engn, 50 Ngam Wong Wan Rd, Bangkok 10900, Thailand
[3] Univ Naples Federico II, Dipartimento Ingn Chim Mat & Prod Ind, Ple V Tecchio 80, I-80125 Naples, Italy
[4] Ist Ric Combust CNR, Ple V Tecchio 80, I-80125 Naples, Italy
[5] Tokyo Inst Technol, Dept Energy Sci, Midori Ku, 4259 Nagatsuta Cho, Yokohama, Kanagawa 2268503, Japan
基金
日本学术振兴会;
关键词
Fluidized bed; Co-combustion; Paper sludge; Coal; Hydrothermal treatment; NOx; SEWAGE-SLUDGE; MILL SLUDGE; COMBUSTION CHARACTERISTICS; NITROGEN CONVERSION; GASEOUS EMISSIONS; NOX; PULP; WASTE; ASH;
D O I
10.1016/j.fuproc.2015.12.033
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Fluidized bed co-combustion of raw paper sludge (Raw-PS) and hydrothermally treated paper sludge (HTT-PS) with either low (Lo-Coal) or high reactivity coal (Hi-Coal) was investigated. The paper sludge was treated in a pilot-scale hydrothermal reactor at 197 degrees C and 1.9 MPa for 30 min. South African bituminous and Thai subbituminous coals were selected as representative of Lo-Coal and Hi-Coal, respectively. A 110-mm bubbling fluidized bed combustor was used in this study. During the steady combustion tests the nominal temperature was 858 degrees C, the fluidization velocity was 05 m/s, and the excess air was varied as 20%, 40%, and 60%. Both single fuel combustion and co-combustion were tested. Co-combustion tests were conducted by feeding the sludge at mixing ratios of 30% and 50% (mass basis) with coal. The main focus of this study was on NO. emissions and unburned carbon performance. Results showed that at 30% mixing ratio using HTF-PS instead of Raw -PS could reduce NOx emission by 3-6% and 9-17% in the case of Lo-Coal and Hi-Coal, respectively, and the loss of unburned carbon could be decreased by 15-18% and 36-53% for Lo-Coal and Hi-Coal, respectively. The particle size distribution of fly ash of all samples was similar regardless of the excess air variation. On the whole, the hydrothermally treated paper sludge showed better performance for co-combustion with coal and would be a better choice compared to the original raw paper sludge. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:230 / 238
页数:9
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