Numerical Simulation And Experimental Study Of Biomass Combustion Flue Gas Electrostatic Precipitator Efficiency

There are a lot of experimental and simulation study of coal combustion flue gas, biomass combustion flue gas ESP research is still relatively scarce. The combustion product ofbiomass is much higher than coal and combustion products are very different. So that, the study of biomass smoke ESP problem of great significance for the efficient use of biomass energy and biomass combustion technology development.First, conduct numerical simulation on the basis of comprehensive introduction the electrostatic dust removal mechanism. demonstrating velocity field distribution and dust particles trajectory under different conditions of the precipitator with intuitive form of images, and the analysis the impact of voltage, gas flow rate and temperature on ESP efficiency of corn, cotton stalks and wood chips three kinds of raw material pellet fuel. The simulation results show that:the wind speed of the collecting zone is significantly higher than the imported Winds from the precipitator, and increase with the improve of import Winds; dust particles trajectory significantly offset to the collecting electrode plate under the action of the electric force, and the higher the voltage, the wind speed is lower, the lower the temperature, the offset is more obvious, the dust removal efficiency is also higher.Second, build a test stand. Design an18kW biomass burner grate, for biomass briquette slag-bonding problem, design a set of grate and slag removal equipment, Grate slag-bonding problems are solved. With particle size online analysis method, analysis the particle size distribution of cotton stalks, corn and wood chips three typical raw material pellet fuel flue gas under different voltages, obtain the influence of voltage value on dust particles particle size distribution. Use city gas dust content measurement method to measure flue the gas dust content of corn, cotton stalks and wood fuel of filter import and export under different voltage, wind speed and temperature conditions. Finally, compare the results of simulation and experiment on the basis of particle size analysis and the measurement results of the amount of dust. Analysis the relationship of voltage, wind speed and temperature with electrostatic precipitator efficiency, and compare the experimental results with the new air pollutant emission standards, analysis the flue whether meet gas emission standards. The analysis results show that:the simulation and test results are in good agreement under the same conditions of temperature and wind speed,the dust removal efficiency increases as the voltage is gradually increased, the precipitator outlet dust amount gradually decreases as the voltage increases; the simulation and experimental results are basically consistent under the same voltage and temperature conditions, dust removal efficiency increases with wind speed gradually increased, quantity of precipitator import and export dust decreased with the wind speed increases; The simulation and experimental results are in good agreement under the same voltage and constant wind conditions, dust removal efficiency decreased with temperature increasing, quantity of precipitator import and export dust decreased with the temperature increases; Comprehensive experimental and simulation results, experiments using biomass combustion furnace recommend dusting voltage to8kV,wind speed to1.7m/s, temperature to90℃, so that the concentration of dust emissions to less than50mg/m3,and to the greatest extent savings the precipitators energy.