Electrostatic precipitators (ESP) have been widely used in different fields such as thermal power plants, cement plants, production of constructive materials, chemical industry, fertilizer production, . . . due to their advantagesover other dust collector systems. One of the parameters which influences on dust removing efficiency of the ESP devices is the speed and velocity distribution of the polluted gas in the collecting chamber. This paper presents the research results of improving the uniform distribution of the gas velocity in the collecting chamber of ESP using CFD (Computational Fluid Dynamics) simulation. The simulation results showed that as the dispersion plate was installed at the gas inlet of the collecting chamber the velocity distribution of gas flow was more uniform and its direction was more stable towards the outlet. In addition, the dispersion plate also improved the flow stability at different flow rates and the smaller hole diameter on the dispersion plate was better for the velocity distribution and direction in the flow. The research results provide an approach foroptimum design of a ESP with high collection efficiency.
Nowadays, motorbikes are still the main and most popular transport in Asian countries, especially, in Vietnam. However, the manifold intake systems in motorbikes are usually designed in a simple structure, which can reduce engine performance and increases fuel consumption in motorbikes. This paper presents the study of the improvement of the intake system in a 125cc motorbike engine to enhance air-fuel mixing quality that can increase the engine performance. The study employs the ANSYS software to obtain an optimal intake systemthrough the tumble and swirl ratios in different simulation cases. Another model wasalso built by Matlab/Simulink to examine the effects of swirl and tumble ratios on engine performance and fuel consumption at various engine speeds. The simulation results show that the modified intake system withan incline angle of 30o has optimal tumble and swirl ratios. Accordingly in conclusion, power output and torque of the engine with the modified intake system are higher, while the fuel consumption is lower than previouslyfound.
Liquified Petroleum Gas (LPG) fuel is currently an energy source being widely applied in many fields in Vietnam, making a significant contribution to the development of the national economy. This paper presents research results of applying LPG fuel used in motorbikes. The traditional liquid fuel system (gasoline) on a motorbike was replaced by an electronically controlled LPG fuel injection system. LPG fuel is designed to inject into the intake manifold. The injection quantity and injection timing are calculated and controlled by the electronic control unit through the calculation and analysis of the input of key parameters such as intake air pressure and temperature, throttle position, engine speed, and camshaft position. The testing results on real roads in an urban area show that the motorbike operates stably on flat and uphill roads. In addition, the cost of LPG fuelconsumption is less than that of the gasoline fuel consumption.
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