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Dust Removal Efficiency and Operation Characteristics of Metal Filters for Coal Gasification Fines and Standard Dust Sample

금속필터를 사용한 석탄가스화 분진 및 표준 분진의 집진 효율과 운전특성

Yun, Yongseung;Chung, Seok Woo;Lee, Seung Jong
윤용승;정석우;이승종

  • Received : 2019.03.19
  • Accepted : 2019.04.10
  • Published : 2019.08.01

Abstract

Demand for improving dust removal efficiency in coal power plants and the dust removal requirement to the level of capturing fine particulate matter and ultrafine particles have been increasing. While bag filter and electrostatic precipitator (ESP) are typically used for dust removal in the processes operating at atmospheric pressure, metal filters or ceramic filters are employed for dust which is produced at high temperature/pressure system as in coal gasification. For dust removal at the high temperature/pressure conditions, two metal filters of five compressed/sintered layers were manufactured and applied to analyze the dust removal characteristics. Manufactured metal filters exhibited more than 99% dust removal efficiency on coal gasification fine particulates in mass basis. To evaluate the fine particulate removal efficiency of less than $2.5{\mu}m$, JIS standard fine sample was used and confirmed the removal efficiencies of 97% and 70~82% on the fine particulates of $1{\sim}2.5{\mu}m$ size range. For the size range of less than $1{\mu}m$, dust removal efficiency of manufactured metal filters significantly degraded with smaller particle size. Improving methods are proposed to overcome the limitations in applying to fine dust of less than $1{\mu}m$.

Keywords

Dust;Metal filter;Collection efficiency;Fine particulate matter;Ultrafine particle