The Experimental Research And Matching Of Electronical Controlled Engine With The Single-biogas Fuel

With the quickly development of economy, the problem of energy and environment havebecome more and more seriouly. Internal combustion engine is the major source of theemergy and the the emissions. Thus, it is vital significance to search clean alternative fuel forinternal combustion engine.Biogas is one of the reproducible clean energy, it possessesextentive、cheap and clean characteristics, in addition, using biogas to generate electricitycould provide a development for farms, with biogas project. Which is get plenty ofencouragement from government.In order to satisfy the requirement of biogas engine used for generating electricity, in thispaper, according to the government project of “The study of key technologies for the biogasengine with ultra-low emissions”, the design of natural engine has been improved and thematch has been studied. The overall program of the biogas engine is lean burn、coolingturbocharger、electronically controlled pressure regulator with mixer、coil-on-plug ignitioncontrol and so on. Besides, improve design the cooling system and match the rationaloxidation-type catalytic converter to biogas engine.Firstly, the main characteristics of biogas and biogas engine were analysised, moreover,according to real biogas which come from farms, the testing biogas was modulated. Basedon the characteristics, the electronically controlled system、electronic pressureregulator、oxidation-type catalytic converter and so on, which are precise、reliable andflexible, been matched for biogas engine.In this paper, author used the CATIA and FLUENT software to research the mixer, whichbelong to fuel supply system. In this way, the computational model of mixer can be establishedaccurately and the results are accurate. The experiments show that the redesigned mixerimproves the controlled precision of mixture concentration and enhance the stability ofelectronically controlled system. The power of engine have been increased8.6%, the fuelconsumption rate have been declined2.6%and exhaust gas temperature have been declined26degrees Celsius as well.Secondly, according to the actual situation of biogas engine, the cooling system has beenredesigned. The calculated result that the cooling area of the radiator is12.42m~2, the rate ofcooling area is0.12m~2/kw,the core area of cooling area is0.69m~2. The experiments showthat the temperature of cooling water was maintained at80.2～88.7℃during the biogasengine working. Thus, the purpose that to redesign the cooling system has been achieved.Finally, the concentration、ignition advance angle and other key parameters of enginehave been calibrated, the engine proformance has been improved. Besides, the biogas with themethane concentration of63%or73%, has been studied with fuel supply system which satisfy the biogas with methane concentration of68%. The experiments show that the parameters ofelectronic pressure regulator would be enlarged0.5kpa,when the methane concentration ofbiogas be delined to5%, if the variety of methane concentration have been slightlychanged,such as, less than5%. We must replace the mixer, if it has been changed largely.The experiments show that the developed biogas engine is adjust to the requirement.