Co-Combustion of Low-Rank Coal with Woody Biomass and Miscanthus: An Experimental Study

被引:22
作者
Kazagic, Anes [1 ]
Hodzic, Nihad [2 ]
Metovic, Sadjit [2 ]
机构
[1] JP Elektroprivreda BiH Dd Sarajevo Power Util, Dept Strateg Dev, Vilsonovo Setaliste 15, Sarajevo 71000, Bosnia & Herceg
[2] Univ Sarajevo, Fac Mech Engn, Vilsonovo Setaliste 9, Sarajevo 71000, Bosnia & Herceg
关键词
co-firing; coal; biomass; woody sawdust; Miscanthus; PULVERIZED COAL; COMBUSTION; EMISSIONS; BEHAVIOR; SLUDGE;
D O I
10.3390/en11030601
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
This paper presents a research on ash-related problems and emissions during co-firing low-rank Bosnian coals with different kinds of biomass; in this case woody sawdust and herbaceous energy crops Miscanthus. An entrained-flow drop tube furnace was used for the tests, varying fuel portions at a high co-firing ratio up to 30%wt woody sawdust and 10%wt Miscanthus in a fuel blend. The tests were supposed to optimize the process temperature, air distribution (including OFA) and fuel distributions (reburning) as function of SO2 and NOx emissions as well as efficiency of combustion process estimated through the ash deposits behaviors, CO emissions and unburnt. The results for 12 co-firing fuel combinations impose a reasonable expectation that the coal/biomass/Miscanthus blends could be successfully run under certain conditions not producing any serious ash-related problems. SO2 emissions were slightly higher when higher content of woody biomass was used. Oppositely, higher Miscanthus percentage in the fuel mix slightly decreases SO2 emissions. NOx emissions generally decrease with an increase of biomass co-firing rate. The study suggests that co-firing Bosnian coals with woody sawdust and Miscanthus shows promise at higher co-firing ratios for pulverized combustion, giving some directions for further works in co-firing similar multi-fuel combinations.
引用
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页数:14
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