| China is the country that produces and uses the most coal,and is also a big country with coal as its main source of energy.At present,China's economy is at a stage of rapid development,and the demand for coal is only a lot.However,in the process of burning coal,a large amount of particulate matter is generated,and particles having an equivalent diameter of 2.5?m or less are not only harmful to the environment,but also affect human health.However,at present,in the field of dust removal,the electrostatic precipitator used has very low removal efficiency of fine particles.In order to solve this problem,this paper studies the condensation and sedimentation performance of fine particulate matter in coal-fired power plants in electrostatic precipitators.In this study,the effects of water mist characteristics,electric field characteristics,and chemical coagulation properties on fine dust condensation were investigated.In order to verify the correctness of the conclusions,under these three conditions,the respective dust removal efficiencies were studied.Finally,the sedimentation performance of the dust was explored.The micro-body analysis of the water film on the wall of the dust collecting plate is carried out,and the continuity equation of the water film flow under the condition of no fluctuation is established,and the water film thickness and velocity distribution law of the dust collecting plate wall are found out.The results show that:?1?The dust of coal-fired power plants is mostly spherical particles with different particle sizes,which are loose and independent,and the surface is relatively smooth.It is not conducive to coagulation without external factors.?2?When the water pressure,the amount of spray,the coverage of the spray,and the particle size of the droplet are appropriately increased,the coagulation effect of the fine dust can be promoted.When no coagulant is added,when the water pressure is 0.5MPa,the spray amount is 6.0 L/min,and the coagulation effect is optimal;the atomization performance of the nozzle has an important influence on the dust condensation,and the smaller the droplet size,The stronger the coagulation effect on fine dust.?3?The electric field characteristics have an important influence on dust condensation.When the voltage is 40kV and the discharge is extremely 16 fish bone acupuncture lines,the coagulation effect on fine dust is the best.?4?The addition of chemical coagulant helps the agglomeration of fine particle dust.When the concentration of XTG is 1.0×10-2g/L,adding phosphoric acid to make the pH value of the solution is 6.5,adding 0.50×10-22 g/L.When the concentration of SDBS surfactant is used,it is best for coagulation of fine dust.?5?The condensation of fine particle dust can improve the dust collection efficiency of electric dust removal.When the concentration of XTG increases,the dust removal efficiency shows a trend of increasing first and then decreasing.When the concentration of XTG is1.0×10-2g/L,dust removal The efficiency is 96.84%;a small amount of phosphoric acid in the agglomerate can improve the dust removal efficiency,and when the pH of the solution is 6.5,the dust removal efficiency is 96.91%;adding the surfactant to the agglomerate can also improve the dust removal efficiency.When the surfactant added was SDBS,the dust removal efficiency was 96.90%.?6?The thickness of the water film on the wall of the dust collecting plate is affected by the water flow speed,the spray water pressure and the flow rate.The value is inversely proportional to the speed ux and the water pressure of 1/2,which is proportional to the flow rate. |
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