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t <br /> Y.Ando or al./Energy 30(1005)2206-2218 2207 <br /> Since the thermal efficiencies of compression ignition engines are especially high,the ultimate goal of <br /> our study is to develop a diesel engine that can operate on both gas oil and gasification gas. <br /> Gasification gas, using air as gasifying agents, is mainly composed of N2,%,CO,COQ, and small <br /> amount of hydrocarbons. The hen#ng values of these fuel <br /> 12()0 kcWM m3 and they have not been utilized effectively until gases arc <br /> typically <br /> y about scion <br /> characteristics of low-BTU.gases have not yet been investigated in detail. The �' Combustion paper <br /> is to clarify the combustion characteristics of tow-BTU �a�of this paper <br /> simulated low-BTU � � h, two kinds of <br /> gas, obtained from a one-step high � t ficauori <br /> process and a two» cep pyralysis/refbrnIing gasification (methane rich rich)gen <br /> were tested in a shoal[-scales )process, as well as natural gas, <br /> parr ignition engine to investigate the combustion characteristics of <br /> low-BTU gases. <br /> I Experimental apparatus <br /> The schematic diagram of the experimental apparatus is illustrated in Rig. 1 The base engine is a <br /> 296 cc-displacement,single cylinder gasoline engine.Major engine modifications include(1)to supply <br /> gaseous fnel,the carburetor was detached and a mixer was installed that has the ability to adjust the sir— <br /> fuel ratio,(2)compression ratio was changed from 9.47 to 9.4 and 11.9,and(3)installation of an ignition <br /> controller to control the ignition timing. <br /> Properties of gages used in this experiment are shown in Table 1.Gas 1 simulates the fuel gas obtained <br /> from an ash melting gasifier,and Gas 2 simulates the fuel gas Obtained from a fixed bed gasifier coupled <br /> with high temperature steam reforming.Although the heating values of these gases are comparable,their <br /> composition differs significantly so that there are large differences in their combustionspeed due to <br /> inaammable difference between the quick-burning hydrogen and the slower-burning methane. <br /> - Ignition Coatrolia <br /> Prassrre Pickup <br /> Spark Plug ®©e Gan flow Maier <br /> Ex Qac do A <br /> f <br /> Air Flow Mehr <br /> Gas Analyzer 4'— <br /> Surge T m* Air <br /> Dymma"aw <br /> Fig. 1.Experimental apparsum. <br />