Flow Field Analysis And Structure Optimization Of Ceramic Filter

Hot dusty gases are often produced in power industry,petroleum industry,chemical industries,and so on.Dusty gases need cleaning in order to protect environment and satisfy various requirements.High-temperature gas cleaning is one of the key technologies to such systems.Ceramic Candle filter is the most promising gas-solid separation equipment.It can remove more than 99.9% of the solid dust particles from flue gas.It is expected that the ceramic candle filter has an extensively application.According to the research content,the initial pressure drop of the ceramic filter is measured.In the same dust concentration of different filtration rate,the same flow filter dust concentration of different situations,the filter pressure drop test is done.The results showed that the thickness of the dust filter greatly reduces the permeability coefficient,and the smaller filtration rate increases filter stable operation time.The results show that the dust layer thickness significantly reduces.The smaller filtration rate increases filter stable operation time.The pressure distribution on the axis of the filter is measured.The experimental results show that the filter along the axial direction of the gas pressure decreases from top to bottom cleaning,and the cleaning effect gradually is weakened.By using the numerical simulation software,when the dust filter is cleaned,pressure field and velocity field are simulated.The simulation results are basically consistent with the experimental measurements.The lower part half of the filter cleaning gas pressure,speed are significantly reduced.Pressure and speed of lower half part of the filter cleaning gas are significantly reduced,which is not conducive to cleaning effect.At the same time,the most energy loss of the blowing gas is in the ejector,which cause excessive energy loss and weaken the cleaning effect of the filter element.To optimize the design method of the gas ejector structure,multi-dimensional numerical simulation was given on part of the structure parameters of the ejector.In order to simplify the simulation,the orthogonal design method was used in the numerical simulation.The effects of nozzle position,inlet diameter,mixing section diameter and nozzle exit ratio and mixing section length on ejector performance were studied respectively.The results show that the ratio of the structure size to the diameter of the nozzle has a relative optimal value.