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Two-stage gasification of dried sewage sludge: Effects of gasifying agent, bed material, gas cleaning system, and Ni-coated distributor on product gas quality

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  • Jeong, Yong-Seong
  • Mun, Tae-Young
  • Kim, Joo-Sik

Abstract

Dried sewage sludge gasification was conducted using a two–stage gasifier composed of a fluidized bed gasifier and tar–cracking reactor to produce a gas with low levels of tar, NH3, and H2S. In this work, the influence of the type of gasifying agent and bed material and the equivalence ratio on the product gas quality were investigated. Furthermore, the possibility of gasification without a hot filter and electrostatic precipitator, which are usually applied to remove impurities generated during gasification, was examined. Finally, the efficiency of a Ni–coated distributor for tar and NH3 removal was evaluated. Overall, steam/O2 gasification produced H2–rich (38–39 vol%) gases. Further, olivine reduced the tar and NH3 contents in the product gas obtained from steam/O2 gasification to 138 mg/Nm3 and 236 ppmv, respectively. A gas cleaning system without a hot filter and electrostatic precipitator produced a gas with only 8 mg/Nm3 of tar. Moreover, a Ni-coated distributor was found to be very effective in reducing the NH3 content to 60 ppmv. Dried sewage sludge gasification experiments in air were conducted four times for 4 h, producing gases with very low levels of tar (3–10 mg/Nm3) and NH3 (60–90 ppmv).

Suggested Citation

  • Jeong, Yong-Seong & Mun, Tae-Young & Kim, Joo-Sik, 2022. "Two-stage gasification of dried sewage sludge: Effects of gasifying agent, bed material, gas cleaning system, and Ni-coated distributor on product gas quality," Renewable Energy, Elsevier, vol. 185(C), pages 208-216.
    • Handle: RePEc:eee:renene:v:185:y:2022:i:c:p:208-216
    DOI: 10.1016/j.renene.2021.12.069
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    References listed on IDEAS

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    1. Jeong, Yong-Seong & Kim, Jong-Woo & Seo, Myung-Won & Mun, Tae-Young & Kim, Joo-Sik, 2021. "Characteristics of two-stage air gasification of polystyrene with active carbon as a tar removal agent," Energy, Elsevier, vol. 219(C).
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    4. Jeong, Yong-Seong & Choi, Young-Kon & Park, Ki-Bum & Kim, Joo-Sik, 2019. "Air co-gasification of coal and dried sewage sludge in a two-stage gasifier: Effect of blending ratio on the producer gas composition and tar removal," Energy, Elsevier, vol. 185(C), pages 708-716.
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    1. Barcelos, Sheyla Thays Vieira & Ferreira, Igor Felipe Lima & Costa, Reginaldo B. & Magalhães Filho, Fernando Jorge Corrêa & Ribeiro, Alisson André & Cereda, Marney Pascoli, 2022. "Startup of UASB reactor with limestone fixed bed operating in the thermophilic range using vinasse as substrate," Renewable Energy, Elsevier, vol. 196(C), pages 610-616.
    2. Shevyrev, S.A. & Mazheiko, N.E. & Yakutin, S.K. & Strizhak, P.A., 2022. "Investigation of characteristics of gas and coke residue for the regime of quasi- and non-stationary steam gasification of coal in a fluidized bed: Part 1," Energy, Elsevier, vol. 251(C).

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