Research On The Process Of Wet Electrocoagulation And Removal Of Fine Particles From Coal Combustion

With the increasingly serious problems of atmospheric pollution and PM2.5,China's emission standards for particulate matter of coal-fired boilers have also been increasingly strict.Most of the traditional dust removal technologies can no longer meet the requirements.At present,the wet electrostatic precipitators used in a wide range of applications can reach the standards of mass concentration,but most of the particulate matter discharged after dust removal is PM2.5.Although the mass concentration is small,the concentration of particles is large,and there is a large amount of water and corrosion.Seriously and many other issues.How to better remove fine particles in smoke has become a hot topic.Based on this situation,the wet electrocoagulation technology came into being,and the capture process of charged droplets on fine particles became the core of the technology.Therefore,this paper mainly uses the method of numerical simulation to analyze and discuss the process of charged droplets capturing particulate matter.The CFD technology was used to study the process of removing particulate matter from a single charged droplet.Under the condition of turbulent flow,the study need to clarify the movement parameters of the flow field and analyze the mechanism of the droplets being captured by the droplets in the flow field.Referring to the droplet purifying particle model used in the previous study,and simplifying the experimental process,a numerical calculation model was selected.Using the k-? two-equation model,the self-programming UDF in C language import solver was used to load the electrostatic force to simulate the process of removing particulate matter from a single charged droplet.Analyze the purification efficiency of the process and explore its influencing factors.Different particle charge,droplet charge,and fluid velocity were targeted in this paper.The process of droplet removal was numerically simulated,and its effect on removal efficiency was analyzed and summarized.The results show that: in a certain range,increasing the particle charge and the droplet charge can increase the efficiency of single droplet removal,but the effect of increasing the droplet charge is better than that of increasing the charge of the particle;Increasing the fluid velocity can reduce the removal efficiency.In the process of charged droplets trapping particulate matter,the electrostatic force has a better effect on the small particles running at low speed.In addition,an experimental bench was designed and constructed to perform experimental research on wet coagulation and the removal of particulate matter.The simulation results were compared and analyzed to verify the model.The experimental results show that: other conditions remain the same,increasing thecorona charge voltage can improve the efficiency of purifying particulate matter;When the concentration of fine particles is increased,the efficiency of the droplets on the purification of the fine particles with smaller particle diameters does not change a lot,and the purification efficiency of fine particles with slightly larger particle diameters slightly decreases.Combining the numerical model of the flow field with the atmospheric purification model,the particle removal efficiency of the charged droplets was calculated based on the data obtained from the numerical simulation and compared with the experimental results.The comparison shows that the simulated data and the experimental data are basically consistent,which shows that the numerical model is suitable for calculating the droplet removal process.