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| Experiment and mechanism analysis on improving flue gas desulfurization efficiency by electrostatic spray |
| Wang Zhentao,Luo Tiqian,Chen Huilong,Li Qingli |
| (School of Energy and Power Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China) |
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Abstract In order to study the plus removal efficiency by electrostatic spray and discuss the relation of mass transfer and droplets surface,charge,and movement characteristics,the experimental investigation of flue gas desulfurization was carried out by electrostatic water and lime slurry spray.SO2 absorption efficiencies with different liquid to gas ratios,Ca/S ratios and electrostatic voltages were obtained,and a maximum removal efficiency increment 10% was achieved.The results indicate that SO2 removal efficiency increases with the increasing of liquid to gas ratio,Ca/S ratio and electrostatic voltages adding,and the trend gradually becomes slower and slower.The high voltage field can improve the surface absorption characteristics and increase Ca2+ concentration on the droplets surface.Droplets surface tension minishing can reduce the mass transfer resistance between the droplets and flue gas,and droplets electrification and non-excess charge polarization enhance the mass transfer impulse force of droplets absorption SO2.Moreover,the second atomization under high elestrostatic voltages can decrease the droplets diameter and add the reacting surface.The droplets can distribute uniformity in the tower for the droplets provided with the same polarity charge.SO2 absorption efficiency improvement is the complicated result from the above factors.
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Received: 01 September 2009
Published: 30 November 2009
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