Development of Advanced Electrostatic Fabric Filter

K. Tomitatsu1, M. Kato1, Y. Ueda2, and C. Nagata1

1Mitsubishi Heavy Industries Mechatronics Systems, Ltd. (MHI-MS), Japan
2Takasago Research & Development Center, Mitsubishi Heavy Industries, Ltd., Japan

Abstract- Recently, countermeasures to reduce ambient fine particulate matters, especially with the diameters less than 2.5 micron meters (PM2.5), have been highly required, because of their negative influence to human health. One of the main sources of PM2.5 is coal-fired power station, and dust collector equipped there is one of the most important devices to reduce ambient PM2.5. In the coal-fired power station, electrostatic precipitator (hereinafter ESP) or fabric filter are usually applied, and fabric filter has an advantage in achieving stable and high performance regardless of kinds of coal since it is not affected by the property of coal ash, such as resistivity, while it has also a disadvantage in its high pressure loss which causes a problem of high power consumption. In order to reduce the pressure loss of fabric filter, hybrid dust collector combined with ESP and fabric filter or pre-charging system for fabric filter have already been proposed, but nevertheless they have not yet been so commonly used.
Authors have also addressed to develop a compact pre-charger, which can be installed in the duct at upstream of fabric filter to charge dust particles electrically there, for the purpose to economically reduce pressure loss of fabric filter, and during the process of the development, we have found that the effect of reducing pressure loss is affected much by property of the dust, and the deterioration of performance of reducing pressure loss is caused by back corona, just like the performance deterioration of ESP. Authors have succeeded in the development of pre-charger which can correspond to high resistivity dust which may cause back corona easily, through rich experience of countermeasures to back corona in ESP, and around 30 to 40% reduction of the pressure loss, together with splendid and stable reduction of outlet emission, of fabric filter have been confirmed.

Keywords- Pre-charger, boxer-charger, fabric filter, back corona, pressure drop



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