Numerical Study On The Effect Of Temperature On Particles’ Trajectory In Electrostatic Precipitator

Electrostatic precipitators are widely used in thermal power plants to capture fine particulate matter and reduce emissions.Most domestic and foreign scholars study electrostatic precipitators at room temperature,and some study high-temperature electrostatic precipitators.The above electrostatic precipitator was studied at a completely different temperature than the exhaust temperature of the power plant,so it is essential to understand the operation of the electrostatic precipitator at the exhaust temperature of the actual power plant.First,the numerical methods are determined,including the control equation of the electric field,the motion equation of the particle,the charging model of the particle,and the motion equation of the fluid.Use the same physical model as the experiment to verify the numerical method.The third chapter discusses the effect of temperature and injection position on the particle’s charging mode and the effect of temperature on the particle’s trajectory.When the working temperature in the electrostatic precipitator rises from 298 K to 413 K,the electric charge of the submicron particles increases,and when the temperature increases from 413 K to 433 K,the charge of the submicron particles decreases.With the increase in temperature,the charge capacity of the particles first increases and then decreases.In contrast,the particles with larger particle sizes,taking 10 μm particles as an example,the charge capacity of the particles decreases with the increase of temperature.When the temperature is 413 K,the change of the charge amount of the submicron particles with the injection position is discussed.The outlet height of the particles decreases with increasing temperature.In Chapter four,the effects of temperature and air velocity on the secondary flow.The effect of temperature,air velocity,and the surface of injection on particle capture efficiency are studied.The increase of air velocity in the electrostatic precipitator channel reduces the effect of the secondary flow on the fluid movement in the electrostatic precipitator channel.With the increase in temperature,the capture of 0.2 μm particles was better with the secondary flow,while the capture efficiency of 0.2 μm particles gradually decreased without the secondary flow.For submicron particles in electrostatic precipitators,under the same velocity of air,particles’ collection efficiency gradually decreases as the temperature increases.When the temperature remains unchanged and the speed increases,the collection efficiency of particles of the same particle size decreases,especially when the airspeed rises from 0.6 to 0.8 m/s,the decrease is more pronounced.With the increase of particle diameter,the collection efficiency increases gradually.When the particle incident surface and the collecting board are closer,the particles’ collection efficiency is better,and it is not easily affected by the air velocity.When the incident surface of the particles is far away from the collecting board,it is easily affected by the air velocity,and the collection efficiency is poor.