HCCIエンジンにおけるバイオマスガスの着火燃焼特性(バイオマス・新燃料・環境技術,<特集>第13回動力・エネルギー技術シンポジウム)

概要

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Auto-ignition and combustion characteristics of biomass gas were investigated experimentally. Mock biomass gas consisted of H_2, CH_4, CO, N_2 and CO_2, was used assuming a wood pyrolysis gas. A test engine was a 3-cylinder 1.6L gas engine modifying compression ratio from 9.5 to 24 and equipping the intake air heating system. Experiments were carried out by varying equivalence ratio and fuel composition. The engine could realize auto-ignition and combustion at higher thermal efficiency with mock biomass gas, IMEP was 0.28Mpa and indicated thermal efficiency was 37% at 600rpm. The knock did not cause at higher equivalence ratio over 0.4, because the fuel had much dilution components, which made combustion speed slower like as EGR. Higher hydrogen content caused the combustion speed to be high, but it did not influence on the ignition timing. On the contrary, the high carbon monoxide content retarded ignition timing, but it did not influence on the combustion speed. Auto-ignition temperature of biomass gas was from 1000K to 1050K as same as hydrocarbon fuels.
社団法人日本機械学会の論文
2009-03-25