Alkali and alkaline
earth metals (AAEMs) in agricultural organic
solid waste (AOSW) contribute to the fouling and slagging during its
combustion. In this study, a novel flue gas-enhanced water leaching
(FG-WL) method using flue gas as the heat and CO2 source
was proposed for effective AAEM removal from AOSW before combustion.
The removal rate of AAEMs by FG-WL was significantly superior to that
by conventional water leaching (WL) under the same pretreatment conditions.
Furthermore, FG-WL also obviously reduced the release of AAEMs, S,
and Cl during AOSW combustion. The ash fusion temperatures of the
FG-WL-treated AOSW was higher than that of WL. The fouling and slagging
tendency of AOSW greatly decreased through FG-WL treatment. Thus,
FG-WL is a simple and feasible method for AAEM removal from AOSW and
suppressing fouling and slagging during its combustion. Besides, it
also provides a new pathway for the resource utilization of power
plant flue gas.
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