Wu Chundu

Experimental and numerical study of flow behavior in electromagnetic valve

This paper presented an experimental and numerical study of the flow behavior in electromagnetic valve. The experimental study had found that the experiment data of the flow rate was always greater than the idealize value. So the numerical simulation of the electromagnetic valve of the nozzle had been done in the paper to study the dynamic changing character of pressure and flow rate. The result showed that one of the reasons that induced the difference between the experimental result and calculation value was that the sudden decrease of the flow rate to the zero was on the time when the valve had been closed, while the flow rate quickly rise to the maxim value when the valve started to open, while the change of the outlet pressure would be in a moment. A complex vortex process of the forming, developing and transporting was been found during process of the valvepsila opening and closing, which would affect the atomization.

Study on the Removal of SO2 from Simulated Flue Gas Using Dry Calcium-Spray with DBD Plasma

In this study, lime-hydrate (Ca(OH)2) desulfurizer was treated by plasma with strong ionization discharge of a dielectric barrier. The removal of SO2 from simulated flue gas was investigated. The principles of SO2 removal are discussed. Several factors affecting the efficiency of SO2 removal were studied. They included the ratio of calcium to sulfur (Ca/S), desulfurizer granularity, residence time of the flue gas, voltage applied to the discharge electrode in the plasma generator, and energy consumption. Experimental results indicate that the increase in Ca/S ratio, the applied voltage and discharge power, the residence time, and the reduction in the desulfurizer granularity all can raise the SO2 removal efficiency. The SO2 removal efficiency was up to 91.3% under the following conditions, namely a primary concentration of SO2 of 2262 × 10−6 (v/v) in the emission gas, 21%(v/v) of oxygen, 1.8% (v/v) of water, a Ca/S ratio of 1.48, a residence time of 2.8 s, a 3.4 kV voltage and a 10 kHz frequency power applied to the discharge electrodes in the plasma generator, and a flow rate of 100 m3/h for emission gas.