A Study of Application DME-LPG Blended Fuel to Gas Engine for Micro Cogeneration(DME, Micro Cogeneration and Energy Saving Technologies,<Special Issue>Power and Energy System Symposium)

Abstract

Recently DME is focuscd as 臼 1ternative fuel because mlE could be made fr〔，m natural gas ， bi ( ， − rnass gasandcoa1 ． NDw I ) ME is investiga 亡 ed fuel for Diesel engine because Cetane number Df D 氏TE isalmDst as sar1 〕c as light uil ， On the other hand ， DMEcanbe blended wjth LPG becausec． hurncteris ． tic of DME is simi ］ ar as LPG ． LPG 〒 s usua1 ］ y used as gas fし1el for small gas engine ， cooking equipmenL and stove ． LPG small gas engine dr［ ves generat 〔｝ r tund heat pun ' ip systc 【 n ， Ifmixture fuel of DME and LPG can be used instead of LPG in the ［ narket ， energy securjty will be safe hl the wor ！ d ． However ， the kr ｝ ockil コg lill ／ it〔，f DME is very low c 〔m コ paring Ll ) G because the auto ignitioll telnpera ・ ture ⊂ ) f DMEis almost assame as ligh 亡oiL This research jsinvestigated on kno ⊂king limitof mixture fuel〔，f DME arid LPG or ［ each rati ( 川 f DME ． The test en ． W［ne is na ' Lural aspirated small spFirk igniti ｛ ，n gas engine which is used for micro cogeneration sys し em ． The bore size of test el〕 gine 88 mm and strol ｛e ［ s 96 nlrn 、 The displacei皿 ent of the し cst engine is ab 〔 ｝ut 1 ． 61iter ． The engine speed is l 500 miu l 、 The result showed し hat the knockingユim辻 Llsillg DME mixture fuel could bc improved by retarded ｛ gnition timing and A 〆 F ratic ) under the limil of blend ratio wi 亡 h〔｝ut EGR is less thnn 30 ％ ． The limit of DME blend ratio should be lcss than 40％ by rctarded ignitioll しiming and controUing