Removal of particulate matter from condensable vapors using a moving bed granular filter

Whitmer, Lysle E.

doi:10.31274/etd-180810-1674

Cited by 2 publications

(4 citation statements)

References 28 publications

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“…In moving bed filters, the pressure build-up across the filter is not a problem. However, fine sand dust might be entrained with the gases, affecting the bio-oil solid content in a negative way …”

Section: Introductionmentioning

confidence: 99%

“…However, fine sand dust might be entrained with the gases, affecting the bio-oil solid content in a negative way. 20 The bio-oil quality has been significantly improved after hot vapor filtration. Solid content below 0.01 wt % and alkali metal concentration below 10 ppm have been measured.…”

Section: ■ Introductionmentioning

confidence: 99%

“…However, fine sand dust might be entrained with the gases, affecting the bio-oil solid content in a negative way. 20 …”

Section: Introductionmentioning

confidence: 99%

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Novel Hot Vapor Filter Design for Biomass Pyrolysis

et al. 2023

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Fast pyrolysis is a mature technology for the conversion of solid biomass into a liquid intermediate, fast pyrolysis bio-oil (FPBO). FPBO has so far been used mainly as heating fuel, but the target is to use it for the production of sustainable fuels and chemicals in the future. In the pyrolysis process, inorganic materials (ash) from the biomass are mostly sequestered in char particles, which can be separated with cyclones. Small particles (<10 μm) escape the cyclones and condense with vapors. In bio-oils, these solid materials are unfavorable because they can cause erosion, corrosion, and blockages at injection nozzles in power generation systems and deactivate the catalyst in bio-oil upgrading. Hot vapor filtration using either moving bed or barrier filters has been tested on a small scale for the removal of fine particles from the pyrolysis vapors. The challenges with these filter types have been the increased pressure drop across the filter with time, inefficient solid removal, and loss in organics. A new hot vapor filter combining both a barrier filter and a moving bed filter was constructed and tested to overcome these problems. In this filter system, the filter elements are inserted in a vessel, where hot sand flows through to continuously remove the cake over filter candles. The filter was successfully tested with stem chips, contaminated wood, and forest residue for 6−8 h without any pressure increase. The organic liquid yield decreased in the best case only by 3 wt % using the lowest filtration temperature and shortest residence time. The oil properties were slightly affected by cracking of the sugar fraction, which decreased the oxygen content, microcarbon residue, and carbonyl content but increased the acidity. Only minor improvements in metal removal were seen due to the high detection limits of metal analysis.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Novel Hot Vapor Filter Design for Biomass Pyrolysis

et al. 2023

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“…The pyrolysis vapors are typically corrosive, viscous, easy-coking, and high-temperature. Simultaneously, char particles <10 μm in size in the pyrolysis vapors present a high concentration . It is demonstrated that the secondary reactions that involve the high-temperature primary pyrolysis vapors by char particles significantly decrease the yields and quality of pyrolysis oil or tar. , The dust content in the pyrolysis oil causes difficulties in the downstream processing of the pyrolysis oil.…”

Section: Introductionmentioning

confidence: 99%

Filtration Performance of Coal Pyrolysis Flying Char Particles in a Granular Bed Filter

et al. 2018

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The filtration of flying char particles from coal pyrolysis vapors plays a very important role in enhancing yields and quality of pyrolysis oil. In this work, the performance of coal pyrolysis flying char particles in a granular bed filter (GBF) was studied in cold model experiments. A filtration model was developed using a macroscopic phenomenological method that describes the filtration of the GBF. The polynomial expression of the relative filter coefficient (F) and the nonlinear expression of the relative pressure drop ratio (G) were applied in the new model. The unsteady state of granular filtration was captured, demonstrating that the GBF performance could be predicted by the new model. Effects of superficial gas velocity, thickness of granular layer, and dust mass concentration on collection efficiency and pressure drop were analyzed. An excellent performance of the GBF was obtained and the total collection efficiency could reach a span between 98% and 99.9%. In the case of lower dust mass concentration, the total collection efficiency and pressure drop were slightly affected by the increasing dust mass concentration. The optimal operating conditions of the GBF were obtained: a superficial gas velocity of 0.2–0.6 m/s and a granular layer thickness of 0.07–0.11 m.

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Removal of particulate matter from condensable vapors using a moving bed granular filter

Cited by 2 publications

References 28 publications

Novel Hot Vapor Filter Design for Biomass Pyrolysis

Novel Hot Vapor Filter Design for Biomass Pyrolysis

Filtration Performance of Coal Pyrolysis Flying Char Particles in a Granular Bed Filter

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