The Refitment Of Taking Biogas As The Fuel Of Engine And Its Performance Parameters Optimization Experimental Research

The thesis firstly introduces the present situation of application research of taking biogas as the fuel of engine and its importance, composition and physical-chemical properties of biogas and problems need to be solved, find out technical measures. Since the major composition of biogas is CH4, but contains a considerable proportion of CO2, ignition temperature is high, burning speed is slow, octane value is high, with high anti-explosion, when it burns, the first problem is to gear the engine, thus employ technical measures such as high energy ignition, higher compression ratio, bigger spark advance or supplying oil advance angle, collocate suitable ratio of air and fuel etc. Consequently, refit gasoline and diesel engine of 165F respectively and make experiments. Alter the magnetic ignition system of gasoline engine to battery ignition system, improve ignition strength, get better performance of start and operating at low speed, fix biogas-air carburetor, attain suitable ratio of air and fuel, let engine start easily and run normally, change the compression ratio and spark advance angle and compare the power performance. The refitment of diesel engine is dual-fuel engine; fix biogas-air carburetor, change supplying oil advance angle and compare the power and economic performance. Experiment shows: after refitted, gasoline and diesel engine can start easily and run normally, the acceleration effect is fine. Enhance compression ratio and spark advance angle, the combustion of biogas engine and its power performance are improved, with obvious gasoline conservation. Maintain high compression ratio, enhance supplying oil advance angle also improve the combustion of biogas-diesel dual fuel engine and its performance.To seek optimal matching of performance parameters, design of orthogonal performance, regression rotation experiment is made base on the experiment. Experiment of four adjustingparameters (compression ratio, spark advance angle, rotation speed, load rate) is designed. Influence of the power of 165F biogas engine is researched under different matching of parameters. The corresponding mathematical models are established. Finally, seek the best parameter with computer; the two regression equations at maximum torque and power are optimized. The best values of each performance in theory and the corresponding values of adjusting parameters are concluded. The result is revised with experiment and with realization for the guidance of actual use.Research result shows: the refitment application of engine can alleviate energy scarcity, make use of convenient and reliable biogas, offer power for agricultural production. Through the parameters optimization the power and economic performance of engine are improve to a certain extent. The conclusion has guidance and propellant effect on research and appliance on agricultural production of taking biogas as the fuel of engine.