Research On Oil And Water Removal From Gases By Electrostatic Precipitator

Biomass is an important renewable energy source. With the energy problem becoming serious, more and more attention has been paid to bioenergy. As one of the most efficient biomass utilization method, gasification produces not only useful fuel gases, but also some byproducts like ash, NOx, SO2and tar. Tar in the product gases will condense at low temperature, and lead to clogged or blockage in fuel lines, filters and engines, which impede the use of bioenergy.In this paper, we review the literatures pertaining to tar reduction or destruction methods during gasification. They can be classified into five main groups:mechanism methods, thermal cracking, catalyst cracking, plasma cracking and self-modification. Among the mechanism methods, the electrostatic detarrer is a commonly devices widely used in coal gasification industry. The principle and structure are similar between ESP and electrostatic detarrer. There’s many research about the dust removal use ESP. However, very few literatures provide information about performance of ESP for tar droplets removal especially from biomass gasification.The process of electrostatic precipitator includes:corona discharge, tar droplets get charged, and the cleaning of the tar. This paper summarized the factors which can impact the performance of electrostatic detarrer, and summed up in two categories:power supply, the properties of the gas. The similarities and difference between ESP and electrostatic detarrer were also listed, in terms of cleaning methods, equipment structure, power supply and operation control.In this paper, the experiment was carried out in a self made tubular electrostatic precipitator. The removal of water and water and2%wt soybean oil mixture droplets in N2、a mixed gas of composition of75%vol N2and25%vol CO2、synthetic fuel gas wad studied. This paper focuses on the residence time、droplet concentration and gas composition on the performance of ESP. The result shows that the existence of CO2is benefit to these droplets removal, and the reduce of the gas residence time may effect the removal efficiency, but as soon as the voltage increased, these two factors can not interfere with the removal efficiency of the droplets.