Development and evaluation of multilayer air filter media
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Development and Evaluation of Multilayer Air Filter Media Young Ok Park ~',Hyun-Seol Park, Seok Joo Park, Sang Do Kim, Ho Kyung Choi and Jeong Hwan Lim Particle Technology Research Center~ Korea Institute of Energy Research, 71-2 Jang-Dong, Yusung-Gu, Daejeon 305-343, Korea (Receh'ed 26 Aim, 2001 9 accepted lO ,hdy 200t)
Abstract-Three bpes of multilayer air filter media were developed and evaluated. ~[\~.oother existing filters were also used lbr comparison of filter pertbnnancc. The pressure drop, the collection etliciency, and the dust-holding capacity of the tested filters were measured, and the internal structure of the filter media was analyzed by using a scanning electron micromope. The muNlayer filters tested in this study ,are composed of pre-surface layer, suttee ta~er, and substcate layer, Among those layers, the suHhce layer is mainly resf,onsible tbr particle collectkm. As a test result, it was lbund that the thickness of a surtiace layer has the greatest elli,~cton filtration peribrmance of a multilaver air filter, Additionally, filtration velocity and electrostatic forces should be considered together as important parameters for multilayer air filter design. Key words: Multilayer Air Filter, Pressure I)rop, Collection Efficiency, Surface Layer. Filtration Velocity
INTRODUCTION Dust particles in the intake air oftuJtx~machinery such as gas turbines or high capacity compressors can do serious damage to the machines. Generally, turbomachines need high flow rate of process air, so the amount of dust particles in the air is also very large. Furthermore, the flow velocity inside the turbomachines is extrctnely high, and the air is heated up to above 1,500~'C and highly compressed, Therefbre, the particulate pollutants contained in the process air have a mechanical force strong enough to do major danmge to turbine blades. According to Schroth [1993], the erosion, abrasion, and corrosion on the surface of the blades can be caused by submicron particles. Those mechanical problems lead to a performance decline of the turbomachines. In order to remove the dust particles from the intake air of tarbomachinery, a high efficiency air filtration system is needed. Air filters used for this purpose are of several different types including cartridge, pocket, and cassette type filters. The application of those filters is determined by field situations, the particle concentration, and necessity of a filter cleaning process. As a guideline for filter selection, the collection efficiency and pressure drop characteristics are equally important factors. As mentioned above, the collection efficiency of a turbine intake air filter can directly affect the performance of the turbine. Dust caking as well as the mechanical damages on turbine blades due to dust particles can be effectively reduced by a high efficiency air filtration system, The high pressure drop across an intake air filter can cause a significant decline of turbine pertbrmance. For example, as the pressure drop of a gas turbine intake air filtration system is in
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