バイオマス等由来熱分解炭化物のガス化技術の検証

摘要

The gasification & power generation and the system of making fuel and chemical raw material from biomass arc drawing attention as the means of environmentally friendly energy technology. The present study applies two-step process of pyrolysis and gasification to biomass, and the aim of the study is to establish an efficient gasification method that can treat pyrolysis carbides from various biomasses. In this report, we describe the effective gas cooling method by endothermic gasification reaction of the pyrolysis carbide with H_2O and CO_2 in the high temperature flue gas within the gasification furnace, which was confirmed with the bench scale experimental apparatus.rnAs a result of the gasification experiment with various carbides, gas cooling by hundreds of degrees was observed in any case in the carbide gasification reaction zone and it was confirmed that the gas cooling could be achieved by the result of gasification reaction without water spraying. The addition of steam improved effectively the gasification rate and the cold gas efficiency. Moreover, the effectiveness of this gasification method was confirmed from the viewpoint, of reduced adhesion of molten ash inside the furnace.%環境対応型エネルギー利用技術のーつとして，バイオマス等のガス化発電，燃料化?原料化システムが注日されている．rn本研究は，熱分解?ガス化の2段プロセスをバイオマスに適用し，多様な原料に対応できる効率的なガス化方法の確立をrn目指したものである?本報では，特に，後段のガス化炉での熱分解炭化物と高温燃焼ガスとの吸熱ガス化反応による効率rn的なガス冷却の有効性について、ベンチスケール実験装置で確認した結果について報告する．rn各種炭化物を用いたガス化実験の結果,いずれの場合も炭化物ガス化反応ゾーンでほ数百度のガス冷却が観察され，水rn噴霧を行わなくとも，ガス化反応を利用してガス冷却が実現できることを確認した．更に，水蒸気の漆加は，ガス化率及rnび燃料転換効率の向上に有効であった．また，部分燃焼によるガス化に比べ，溶融飛灰付着が軽減することが確認できた．