Research on Electrical Resistivity of Wood Dust
|School||Nanjing Forestry University|
|Keywords||wood industry electrical resistivity of dust ESP|
As the development of wood industry, the problem of wood industry dust pollution has increasingly become severer to people, and to some extent, has become the important factor of restricting the development of our country wood industry. Most of the medium and small scaled woodworking enterprises were not adopt any dust control measure. And the productive dust was vented in inorganization. In the existing furniture enterprises which adopted pneumatic dust collection systems, many dust collection systems didn’t have perfect effect.Because the dust in wood industry was lighter than in mining、cement and other industries, the dust in wood industry was difficultly extracted, and the dust separator should have high separation efficiency. For reaching the standard for national industrial exhaust gas (GB16297-1996), domestic woodworking enterprises adopted increasingly baghose precipitator to extract micro-dust, such as wood dust. At present, wood industry has not adopted ESP(electrostatic precipitator). Compared to other separators, ESP had many advantages.Therefore it was significant that wood industry adopted electrostatic dust separator. The electrical resistivity of dust was the important basis of electrostatic dust separator designing. The electrostatic precipitator could be applied to the dust of which the specific resistance was 104~1011?·cm. Dust specific resistance was related with temperature、humidity、the ingredients of dust and so on. Therefore it must be firstly that the specific resistance of wood dust was researched to decide whether the electrostatic dust separator was applied in wood industry.The objects of researches were four kinds of dust came from three typical woodworking enterprises. It was researched that how dust diameter、moisture content and temperature affected the specific resistance. And it was discussed that if electrostatic dust separator could be used for wood dust, and when electrostatic dust separator could be used for wood dust.Researches found that: inherent specific resistances of four kinds of wood dust were high which exceeded greatly the extent of specific resistance in which electrostatic dust separator could be used(104～1011Ω·cm). dust diameter had no effect on specific resistance, and temperature and moisture content were the primary factors that influenced the specific resistance. The electrostatic dust separator could be used for this dust of which the specific resistance was reduced by adjusting moisture content or temperature.