主催: 社団法人 日本エネルギー学会 石炭科学部会, 社団法人 日本エネルギー学会 コークス工学研究部会
共催: 化学工学会 エネルギー部会, 日本学術振興会 石炭・炭素資源利用技術第148委員会, 日本エネルギー学会 重質油部会
会議名: 第46回石炭科学会議
回次: 46
開催地: 鹿児島東急ホテル
開催日: 2009/11/26 - 2009/11/27
p. 136-137
This paper aims to evaluate the addition of an Mg-based additive to coal on the emission/reduction of particulate matter (PM) during coal combustion. Four pulverized coals with different mineralogical properties were investigated. Each of them was mixed with Mg-based additive and combusted at 1723K in a lab-scale drop tube furnace (DTF). The results indicate that the Mg-based additive tested here has a pronounced impact on particle size distribution of PM and the morphologies of individual ash particles. For all the coals tested here, addition of the Mg-based additive increased the coarse ash fraction and substantially reduced the amount of ash particles smaller than 2.5μm (PM_<2.5>). This is because the Mg-based additive is able to reduce ash melting point via the formation of low-melting eutectic compounds which promote the coalescence among sub-micron mineral particles. The effect of the Mg-based additive on PM_<2.5> reduction also depends on the properties of the original minerals present in the coal. The comparisons indicate that the model can satisfactorily predict ash formation and properties, taking into account both coalescence of included minerals and fragmentation of excluded minerals.