Numerical Simulation Study On Pre-dedusting Structure Of DeNO_x Inlet Flue

Solid particulates and nitrogen oxides are important causes of atmospheric pollution.The coal-fired power plants emit large amounts of solid particles and nitrogen oxides to the air each year.It is of great significance to purify the flue gas from coal-fired power plants.As the current plant denitrification device is basically arranged behind the economizer,it belongs to the high ash section.As dust particles cause poisoning of the SCR catalyst,the reaction area decreases.In this paper,the structure of the pre-dust removal at the tail section of the economizer and the inlet of the denitrification inlet is studied.A good dust removal effect is designed,the dust removal resistance is low,the structure is simple and the uniformity of the flow field can be maintained..In this paper,three pre-dusting structures were studied by means of numerical simulation.They were blinds,cyclone separators,centrifugal arc dust collectors.The dust removal efficiency,dust removal resistance,flow field uniformity,and space occupation size were studied and analyzed.Finally,the arc centrifugal dust collector proposed in this paper has a dust removal efficiency of about 50%,and the pressure drop is maintained at 164Pa.The uniformity of abortion is also good.For the blind dust collector,this paper studies the dust removal characteristics under different working conditions and different dust particle diameters.The simulation results show that as the particle diameter increases,the dust removal efficiency also increases.As the inlet speed increases,the dust removal efficiency decreases.Under standard conditions,the pressure drop is 362Pa and the dust removal efficiency is about 13%.The uniformity of the flow field in the flue is better than the flue.For the cyclone separator,this article also studied the dust removal characteristics under different working conditions and different dust particle diameters.The simulation results show that as the dust particle diameter increases,the dust removal efficiency increases as a whole.When the dust particle diameter is 40?m-80?m,the dust removal efficiency is maintained at about 50%.As the inlet speed increases,its dust removal efficiency increases slowly.In standard conditions,the pressure drop is 3600Pa and the dust removal efficiency is about 70%.The uniformity of the flow field in the flue has been severely damaged.For arc centrifugal dust collectors.This paper studies the dust removal characteristics of different arc radius and different dust particle diameter under different working conditions.The simulation results show that as the dust particle diameter increases,the dust removal efficiency also increases.As the inlet speed increases,the dust removal efficiency decreases first and then increases.Under standard conditions,the pressure drop is 164Pa and the dust removal efficiency is about 50%.The flow field uniformity of the flue is good.Finally,the dust removal efficiency brought by unit pressure drop is proposed.Arc centrifugal dust collector is almost 10 times of other structures.In this paper,the denitrification inlet flue is studied for the first time in combination with the characteristics of dust removal and the uniformity of the flow field,which provides a theoretical basis for the study of denitrification inlet flue.The arc centrifugal dust collector proposed in this paper has certain reference value in the engineering and the design of the dust collector.