Abstract
The issues of trace element emissions during coal combustion has been a concern in recent years due to their environmental pollutant. To study the trace element transformation, the thermodynamic calculation (FactSage 7.2) was used. Five kinds of pure mineral oxides (Al2O3, CaO, Fe2O3, K2O, and MgO) and As, B, Cr, F, and Se in fly ash were considered for trace elements. The results confirm that all mineral oxides have a good correlation with arsenic to form Ca3(AsO4)2, FeAsO4, K3AsO4, and Mg3(AsO4)2. Boron has a good relationship with Al, Ca, and Mg to form (Al2O3)9(B2O3)2, Ca3B2O6, and Mg3B2O6. Chromium has a good correlation with K and Ca to form K2CrO4, CaCr2O4. Furthermore, FeF3(s) KF(s), and AlF3(s) are predicted from the interaction of fluorine with Fe2O3, K2O, and Al2O3. The effect of mineral oxides on selenium partitioning are not observed. The inhibition order of trace elements by mineral oxides is as follow: As (Al2O3 > MgO > CaO > Fe2O3 > K2O), B (Al2O3, CaO, Fe2O3, K2O, > MgO), Cr (CaO > K2O > Al2O3, MgO, Fe2O3), F (CaO > MgO > Al2O3 > Fe2O3 > K2O). The results will be useful to control the trace element emissions.
Highlights
According to the International energy agency, coal is still an important position as a world energy source during the decade due to the perception that coal is the cheapest source and primary position in power generation [1]
The results show that the inhibition ratio of Al2 O3 was higher than other mineral oxides in each temperature range
The inhibition order of trace elements (TEs) during combustion is as follow: As
Summary
According to the International energy agency, coal is still an important position as a world energy source during the decade due to the perception that coal is the cheapest source and primary position in power generation [1]. In coal-thermal power generation, coal is used as raw material for energy production through the combustion process. The combustion of coal containing even only several parts per million of trace elements (TEs) could result in the release of several tons of pollutants into the environment [2]. The. TEs in coal are defined as an element occurring in a very low amount (
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