期刊
BIORESOURCE TECHNOLOGY
卷 268, 期 -, 页码 278-285出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.07.145
关键词
Alkali and alkaline earth metal; Combustion characteristics; Single particle; Pine sawdust; Bituminous coal
资金
- National Natural Science Foundation of China, China [51506091, 51576100]
- National Key R&D Program of China [2016YFB0600100]
Alkali and alkaline earth metal (AAEM) species are the main components of the ash of biomass, and which would influence the combustion of biomass and coal during the co-firing process. The aim of this paper is to investigate the effects of potassium (K), sodium (Na), calcium (Ca), and magnesium (Mg) on the combustion characteristics of pine sawdust (PS) and bituminous coal (BC) by a single particle combustion method. The raw, ash-free and impregnated samples were prepared, and their combustion processes were recorded by a high speed camera. Based on the recorded flame images, the effects of K, Na, Ca and Mg on the combustion characteristics (ignition, volatiles combustion, char combustion) of PS and BC were analyzed. The results reveal that the demineralization treatment brings negative effects on the combustion of PS, which reflects in longer ignition delay time, volatiles and char burnout time, and lower combustion temperature, while the effects on the combustion of BC are opposite. The impregnated samples exhibit shorter ignition delay time, volatiles and char burnout time, and higher combustion temperature than the ash-free samples. In the entire combustion process of PS and BC, K exhibits the strongest promotion effect. When the concentration of K increases from 0 to 2 wt%, the ignition delay time of PS and BC decreases about 5.5 ms and 16.4 ms respectively, the volatiles combustion temperature increases about 41 degrees C and 77 degrees C respectively, and the char combustion temperature increases about 226 degrees C and 141 degrees C respectively.
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