No.18 低融点灰を有する低品位炭の微粉炭ボイラ利用技術の開発(研究発表)

概要

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The main purpose of this study is to develop the combustion technology for low-rank coals with low melting point of ash. Various kinds of coals with different melting temperatures and ash compositions were used as the samples for the chemical equilibrium calculations and the pilot-scale combustion experiment. It was confirmed that the deposition fraction of ash obtained by the experiment rapidly increased when the molten slag fraction obtained by the calculation became over 60%. Finally, the combustion tests of the blended coal of low rank coal with bituminous coal were conducted using a 145 MW pulverized coal-fired boiler. The blending mass ratio of low rank coal to bituminous coal was decided, using the coal blending method developed. As a result, the mass of the deposited ash for the blended coal did not greatly increase and no slagging problems occurred for 11 days of boiler operation.
2011-10-27