Removal of Exhaust Particulate Matter from Biomass Furnace Using a Multiple-Tube Electrostatic Trap
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Electrostatic precipitator is one of the most common devices used to control particulate emissions from boilers, incinerators and some other industrial processes. Electrostatic precipitator has many advantages compared to mechanical devices such as bag filters or cyclones, because it can operate over a wide range of gas temperatures and can achieve high particle trapping efficiency. In this work, a new multiple-tube type electrostatic trap for removal of particulate matter from biomass furnace exhaust was theoretically and experimentally investigated. The trap consists of a simple array of coaxial discharge electrodes placed along the axis of each cylindrical collection tube. The discharge electrodes are connected to the positive high voltage supply, while the cylindrical collection tubes are grounded. The positive high voltage supply is used to produce the corona discharge field between individual discharge electrode and collection tube. The particle-laden exhaust gas flow is directed across the corona discharge field and is then charged. The charged particles are deflected radially outward and deposited on the collection tube wall. In this study, the overall collection efficiency of the electrostatic trap is evaluated as a mass loading ratio between the difference at inlet and outlet, to the particle loading at inlet of the device. It was found that about 75 % overall collection efficiency can be achieved with a relatively simple multiple-tube electrostatic trap design. From results obtained, the electrostatic trap was regarded as a promising tool for collecting particulate matter from biomass furnace exhaust.
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