Fossil Energy. Low NOx Combustion Technology in Pulverized Coal Combustion.

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  • 特集　化石エネルギー利用技術　微粉炭燃焼に伴うＮＯｘの低減技術
  • ビフンタン ネンショウ ニ トモナウ NOx ノ テイゲン ギジュツ

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Abstract

As an energy source for thermal power stations, coal will be most important because the minimum reserve of coal is many times more than that of other fossil fuels whose depletion is feared. The supply of coal is expected to be stable in the future. In pulverized coal combustion. which is a major coal utilization technology, it is necessary to develop flue gas cleaning technology to control environmental pollutants.Especially, NOx control technology is very important because selective catalytic denitrification equipment is of high cost and it has a limited removal performance.So, it is very important to develop low NOx combustion technology which controls NOx formation in pulverized coal combustion.<BR>In this paper, the concept of low NOx combustion and the trends of research and development in this field are introduced in detail. The newest low NOx combustion technology, which accelerates low air ratio combustion near the burner and uses formation and intensification of the reduction flame, is investigated. The combined low NOx combustion technology, which comprises the use of a low NOx burner, secondary fuel injection and intensified two stage combustion, can significantly reduce the NOx emission in pulverized coal combustion.

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