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Experimental and kinetic studies on ash fusion behavior: a high‐precision acquisition method for ash fusion temperatures
Author(s) -
Lv Yuan,
Niu Yanqing,
Wang Guangyao,
Xu Liang,
Lei Yu,
Hui Shi'en,
Wang Denghui
Publication year - 2021
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.2644
Subject(s) - shrinkage , fusion , activation energy , materials science , kinetic energy , decomposition , repeatability , biomass (ecology) , composite material , chemistry , geology , philosophy , linguistics , physics , oceanography , organic chemistry , chromatography , quantum mechanics
Ash fusion characteristics including ash properties and morphological changes in high‐temperature fusion test were studied among four types of fuels comprising two woody biomass, three straw biomass, two bituminous coals, and three biomass/coal mixtures. On the basis of ash fusion behavior and kinetic analysis of the ash melting process, a high‐precision acquisition method for ash fusion temperatures (AFTs) was developed. First, a reading index of AFTs was proposed; that is, in high‐temperature fusion test, initial deformation temperature (IDT), softening temperature (ST), and fluid temperature (FT) could be identified by the height shrinkage of 38%, 86%, and 98%, or the area shrinkage of 50%, 77%, and 97%, respectively. Kinetic analysis conducted on height/area shrinkage indicated that activation energy was highly related to temperature difference among IDT, ST, and FT, and low activation energy facilitated the enlargement of the temperature differences of ST‐IDT and FT‐ST. XRD patterns illustrated low activation energy had a promotion effect on the generation of higher melting substances such as KAlSi 3 O 8 and CaSiO 3 , causing the elevation of the ST and FT. At last, a calculation method for AFTs based on activation energy and average height/area shrinkage was performed, which had high repeatability within an average error of ~6°C.