Journal
APPLIED THERMAL ENGINEERING
Volume 125, Issue -, Pages 134-144Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2017.06.144
Keywords
Ash-deposition characteristics; Straw; Lignite; Modification mechanism
Funding
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA07050103]
- Natural Science Foundation of Shandong Province, China [ZR2014BM014]
- Youth Natural Science Foundation of Shanxi Province, China [Y5SJ1A1121]
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The ash-deposition (AD) characteristics of straws (corn stalk [CS], wheat straw [WS], cotton stems [CCS], and soybean stalk [SS]), and the effects of lignite (Husheng [HS], Huolinhe [HLH]) on the characteristics were investigated. Under the same conditions, the AD mass ratio (M-ad) decreases as WS > CS > CCS > SS, and the M-ad of the four straws decreases more obviously with HS addition than that for HLH addition. The M-ad of SS and CSS increases slowly before 1000 degrees C and then increases rapidly; whereas for CS and WS, the change occurs at 950 degrees C. The differences result mostly from the higher potassium-oxide contents in CS (26.34%) and WS (30.04%) over those in CCS (11.63%) and SS (10.25%). Ca2+ replaces K+ in semi-molten alumino-silicate (orthoclase and leucite) and results in the formation of a high melting-point anorthite. This, together with the generation of high melting-point mullite, leads to a decrease in M-ad of the mixed ashes with an increase in lignite mass ratio. The position changes of the ash composition in the ternary phase diagrams and their variation in liquid-phase content with increasing temperature based on the FactSage software calculation may explain the variation in M-ad. (C) 2017 Elsevier Ltd. All rights reserved.
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