De-dusting in biomass gasification process using a coated bag filter
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ORIGINAL ARTICLE
De-dusting in biomass gasification process using a coated bag filter Joon Yub Kim 1,2 & Young Min Jo 2 & Sang Bum Kim 1 Received: 11 June 2020 / Revised: 25 August 2020 / Accepted: 27 August 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The gasification process of solid refuse fuel (SRF) releases tar and particulate pollutants in addition to many gaseous pollutants. This study investigated the effectiveness of pre-coating on a fabric filter for dust collection instead of a combined control process involving a wet scrubber and a bag filter. The powder layer composed of hydrated lime, wood char, or activated carbon contributed to reduce the blocking of the open pores of the fabric filter by tar and particulate matter. Among the three materials, hydrated lime was accumulated the most, resulting in a 0.7-mm coating thickness. The filter made of polyphenylene sulfide was the most effective in collection efficiency (86%) for the allowable pressure drop (60 mmH2O). Since a single filter with precoating is highly efficient, an oil scrubber with a removal efficiency of 2% to 3% is not essential. Keywords Biomass . Gasification . Oil scrubber . Pre-coating . Tar . Particles
1 Introduction Solid refuse fuel (SRF) obtained from waste materials is a promising fuel source that can be utilized for energy recovery. Utilization of those wastes such as SRF is a plausible solution that can reduce the burden of landfilling and incineration [1]. Wood-based SRF from agricultural residue, forest residue, and waste furniture including the manufacturing scraps is typically pelletized [2, 3]. However, since the high moisture and low energy density of SRF limits its direct use in industrial boilers, it has mostly been thermally converted to gas-phase fuel [4]. While the “producer gas” consisting of H2, CO, or CH4 is formed through this gasification, other byproducts including ash and tar are also generated. This tar and ash damage the turbine and internal combustion engines by blocking the pipe lines and filters. Therefore, these unwanted products * Sang Bum Kim [email protected] Joon Yub Kim [email protected] Young Min Jo [email protected] 1
Green and Sustainable Materials R&D Department, Korea Institute of Industrial Technology, Cheonan-si, Chungcheongnam-do, South Korea
2
Applied Environmental Science Department, Kyunghee University, Yongin-si, Gyeonggi-do, South Korea
need to be separated, for example, from the producer gas before field application, fuel for an internal combustion (IC) engine, fuel cells, or conversion to liquid fuels or FischerTropsch synthesis [5]. Tar in particular is a complex mixture of hydrocarbons composed of multi-ring aromatic compounds along with other oxygen containing hydrocarbons and complex polycyclic aromatic hydrocarbons [6]. The frequently applied conventional methods for tar removal from producer gases are absorption, adsorption, and filtration [7]. Despite low collection efficiency, the low operational cost of wet absorption technologies has made
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