A Research On Operation Characteristic Of The Mixer Of A Small Gas-engine

Energy is the artery of the national economy development. In the latest years, China keeps a high GDP sustainable growth. Meanwhile, the energy utilization efficiency is low. As a result, energy saving becomes one of urgent affairs, especially in Shanghai of lacking resources. With the spreading and application of natural gas, distributed generation technologies have received more and more attention, due to improvement of energy utilization efficiency. Gas-engine driven CHP system is one of the kind of distributed generation technologies. Gas-engine has high generating efficiency and combined efficiency, quick starting time, low gas supply pressure and low equipment investment, etc. Consequently, the development of the small scale CHP system has a important significance.The generating efficiency of the previous system is lower(up to 22.95% in 2500rpm),and the excess oxygen content in flue gas is on the low side. We aim at to improve the system, including adjusting strap transmission, designing and calibration the lemniscate's flow meter, resolving the communication problem between the instrument and computer data acquisition system, and choosing the measuring method of excess air coefficient, and so on. Then the new system is tested. Results show that the generating efficiency after improving the system is better than that of the pervious system.Mixer is critical component in gas-engine conversion, its operation characteristic has influence on the performance evaluation of the whole units. This paper is for the first time to use CFD technique simulate the steady-state process of IMPCO 100 proportional mixer. This paper mainly analyzes the effect of throttle opening on mixture formation, the characteristic of the proportional mixer in different fuel, the effect of inlet boundary condition on mixture formation, and the optimization of the mixer configuration. Those were verified with test.In addition, it is unable to gain the dynamic operation characteristic of the proportional mixer from test, because the precision of the pressure sensor used to measure vacuum in the engine intake manifold is limited. Based on the present theory of dynamic process analysis of the proportional mixer, the dynamic process of the proportional mixer is also discussed by applying finite volume method and MATLAB programming.