Dust Flow Separator Type Electrostatic Precipitator for a Particulate Matter Emission Control from Natural Gas Combution

摘要

Control of Particulate matter (PM) emission is a key pollution issue affecting the environment and human health,especially sizes that range below 10 μm. The objective of this work is to develop a dust flow separator type electrostatic precipitator (DFS-ESP) for the effective control of fine particulate matter emission from natural gas combustion. An experiment was conducted for natural gas combustion exhaust flow rates from 2.5 Nm3/h to 9 Nm3/h, ESP applied voltage from 0 to 30 kV,and combustion gas temperature from 80 °C to 160 °C. Particle measurements were conducted at upstream, downstream and middle of the DFS-ESP system. The experimental results show that particle size emitted from the natural gas combustion ranges in 17 nm -300 nm in diameter, volume density ranges approximately from 5×108 #pt/m3 to 5×109 #pt/m3 depending on the combustion conditions. The dust flow separator can concentrate 90% of fine particles in 1%-3% of the gas flow and divert it to the ESP section from the main flow channel allowing a higher efficiency for particle removal. In terms of overall particle collection efficiency, the DFS-ESP system can remove up to 95% particles based on the number density.