2018 Fiscal Year Final Research Report
Elucidation of the concentration and condensation mechanism of trace harmful metals to PM2.5 in coal combustion
| Project/Area Number |
26420163
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Thermal engineering
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| Research Institution | Kagawa University (2018)
Maizuru National College of Technology (2014-2017) |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2019-03-31
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| Keywords | 灰 / 粒子状浮遊物質 / 炭種 / コークス / 多環芳香族 / バイオマス |
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| Outline of Final Research Achievements |
Multiple types of coal were pyrolyzed to obtain coke particles with different properties (melting point, amount of ash, caking and agglomerating properties). The coke particles were arranged to form layers and they were combusted. The effects of various factors on PM formation were then investigated.
(1) PM 2.5 was easily formed in a low temperature atmosphere (below 1000°C).(2) Combustion of coke particles produced from ash with a low melting point (approximately 1230°C) resulted in formation of lower amounts of PM 2.5 than combustion of coke particles from ash with a high melting point (approximately 1450°C). This is because the melting and coalescence of ash particles were easier in the former ash than in the latter ash.(3) The PM 2.5 formation can be suppressed by blending coal containing ash with a low melting point. In addition, The PM 2.5 formation can be suppressed by blending coal with a high value of the indicator.
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| Free Research Field |
熱工学
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| Academic Significance and Societal Importance of the Research Achievements |
健康被害を抑えるためにも，大気中への飛散を低減するためにも，燃焼から発生する微粒子（PM2.5）の生成機構および石炭燃焼におけるＰＭ灰への微量有害元素の濃縮・凝縮現象の解明が必須である．本研究においては，近接する層状のコークス粉の燃焼から発生するPMの生成機構を調査するために基礎的な実験を実施した．調査項目は，(i) PM生成に及ぼす温度の影響，(ii) PM生成に及ぼすコークス内の灰性状（灰融点，灰分量）の影響，(iii) PM生成に及ぼすコークス性状（粘結塊化性）の影響である．
加えて，石炭揮発分中の多環芳香族炭化水素（PAHs）を起源とするＰＭ生成についても調査した．
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