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Kunio Yoshikawa – One of the best experts on this subject based on the ideXlab platform.

  • System development and analysis for producing high quality gas and activated sludge char
    Journal of Mechanical Science and Technology, 2012
    Co-Authors: Young Nam Chun, Seong Cheon Kim, Kunio Yoshikawa
    Abstract:

    For energy and resource utilization of dried sewage sludge, an integrated system with in-line connection of pyrolysis gasifier, plasma reformer, and fixed bed adsorber was developed. The plasma reformer was set to improve producer gas yield by destructing tar released from the pyrolysis gasifier. The fixed bed adsorber filled with the sludge char produced from the pyrolysis gasifier was installed for Adsorption of un-treated tar. The pyrolysis gasifier produced sludge char, tar and gas. The sludge char showed 98.1 m^2/g of specific surface area and 63.49 Å of mean pore size, which had a good distribution of micropore and mesopore with superior Adsorption rate of light PAH tar. The concentrations of gravimetric tar and total light tar were 26.3 g/Nm^3 and 10.9 g/Nm^3, respectively. The analyzed light tar was in the order of benzene, naphthalene, benzonitrile, benzeneacetonitrile, anthracene and pyrene. Produced gas was composed of hydrogen, carbon monoxide, methane, and carbon dioxide. The plasma reformer displayed 83.2% of removal efficiency with 4.4 g/Nm^3 of gravimetric tar at the outlet due to tar cracking and steam reforming reaction. The total amount of light tar was 1.3 g/Nm^3. Among the reforming gas, the concentration of hydrogen, carbon monoxide, and methane was increased. Gravimetric tar at the outlet of the adsorber was 0.5 g/Nm^3, which was 88.6% of removal efficiency. The total amount of light tar was 0.39 g/Nm^3. Gas analysis results at the exit showed 50.5% H_2, 21.9% CO, 10.5% CH_4, 7.7% CO_2 and 0.1% C_2H_2 with a higher heating value of 13,482 kJ/Nm^3. Therefore, sewage sludge can be converted into energy and resource by pyrolysis and gasification since the producer gas and sludge char could be utilized in a heat engine and Adsorption Tower for tar removal, respectively.

  • pyrolysis gasification of dried sewage sludge in a combined screw and rotary kiln gasifier
    Applied Energy, 2011
    Co-Authors: Young Nam Chun, Kunio Yoshikawa
    Abstract:

    A pyrolysis gasifier, with carbonization and activation steps, was developed to convert dried sludge into activated char and gas fuel energy. To determine the optimal driving conditions, parametric investigations were conducted on the amount of steam input, pyrolysis gasifier temperature and moisture content in the dried sludge. The optimal conditions for the dried sludge were found to be a steam input of 10 mL/min, gasifier temperature of 820 °C and moisture content of 11% with a holding time in the pyrolysis gasifier of 1 h. The specific area of the activated char was 40.1 m2/g, with an average pore diameter and volume of 63.49 A and 0.2354 cm3/g, respectively. The pyrolysis gases were H2 (34.1%), CO (18.6%), CH4 (8.5%) and CO2 (8%). The higher heating value for the pyrolysis gas was 10,107 kJ/N m3. To determine the tar Adsorption characteristics, a benzene Adsorption test was conducted using a fixed bed Adsorption Tower (H/D = 2, GHSV = 1175/h). The saturation point of the activated char was found after 45 min, and the amount of Adsorption was 140 mg/g. Therefore, the pyrolysis gasification of sewage sludge can produce activated char which can be used to reduce tar, and gasification gas which can be utilized as a high enthalpy gas fuel.

Young Nam Chun – One of the best experts on this subject based on the ideXlab platform.

  • System development and analysis for producing high quality gas and activated sludge char
    Journal of Mechanical Science and Technology, 2012
    Co-Authors: Young Nam Chun, Seong Cheon Kim, Kunio Yoshikawa
    Abstract:

    For energy and resource utilization of dried sewage sludge, an integrated system with in-line connection of pyrolysis gasifier, plasma reformer, and fixed bed adsorber was developed. The plasma reformer was set to improve producer gas yield by destructing tar released from the pyrolysis gasifier. The fixed bed adsorber filled with the sludge char produced from the pyrolysis gasifier was installed for Adsorption of un-treated tar. The pyrolysis gasifier produced sludge char, tar and gas. The sludge char showed 98.1 m^2/g of specific surface area and 63.49 Å of mean pore size, which had a good distribution of micropore and mesopore with superior Adsorption rate of light PAH tar. The concentrations of gravimetric tar and total light tar were 26.3 g/Nm^3 and 10.9 g/Nm^3, respectively. The analyzed light tar was in the order of benzene, naphthalene, benzonitrile, benzeneacetonitrile, anthracene and pyrene. Produced gas was composed of hydrogen, carbon monoxide, methane, and carbon dioxide. The plasma reformer displayed 83.2% of removal efficiency with 4.4 g/Nm^3 of gravimetric tar at the outlet due to tar cracking and steam reforming reaction. The total amount of light tar was 1.3 g/Nm^3. Among the reforming gas, the concentration of hydrogen, carbon monoxide, and methane was increased. Gravimetric tar at the outlet of the adsorber was 0.5 g/Nm^3, which was 88.6% of removal efficiency. The total amount of light tar was 0.39 g/Nm^3. Gas analysis results at the exit showed 50.5% H_2, 21.9% CO, 10.5% CH_4, 7.7% CO_2 and 0.1% C_2H_2 with a higher heating value of 13,482 kJ/Nm^3. Therefore, sewage sludge can be converted into energy and resource by pyrolysis and gasification since the producer gas and sludge char could be utilized in a heat engine and Adsorption Tower for tar removal, respectively.

  • pyrolysis gasification of dried sewage sludge in a combined screw and rotary kiln gasifier
    Applied Energy, 2011
    Co-Authors: Young Nam Chun, Kunio Yoshikawa
    Abstract:

    A pyrolysis gasifier, with carbonization and activation steps, was developed to convert dried sludge into activated char and gas fuel energy. To determine the optimal driving conditions, parametric investigations were conducted on the amount of steam input, pyrolysis gasifier temperature and moisture content in the dried sludge. The optimal conditions for the dried sludge were found to be a steam input of 10 mL/min, gasifier temperature of 820 °C and moisture content of 11% with a holding time in the pyrolysis gasifier of 1 h. The specific area of the activated char was 40.1 m2/g, with an average pore diameter and volume of 63.49 A and 0.2354 cm3/g, respectively. The pyrolysis gases were H2 (34.1%), CO (18.6%), CH4 (8.5%) and CO2 (8%). The higher heating value for the pyrolysis gas was 10,107 kJ/N m3. To determine the tar Adsorption characteristics, a benzene Adsorption test was conducted using a fixed bed Adsorption Tower (H/D = 2, GHSV = 1175/h). The saturation point of the activated char was found after 45 min, and the amount of Adsorption was 140 mg/g. Therefore, the pyrolysis gasification of sewage sludge can produce activated char which can be used to reduce tar, and gasification gas which can be utilized as a high enthalpy gas fuel.

Atsushi Tsutsumi – One of the best experts on this subject based on the ideXlab platform.

  • Conceptual design of a novel pressure swing CO2 Adsorption process based on self-heat recuperation technology
    Chemical Engineering and Processing – Process Intensification, 2015
    Co-Authors: Chunfeng Song, Yasuki Kansha, Masanori Ishizuka, Atsushi Tsutsumi
    Abstract:

    Abstract CO2 capture and storage (CCS) technology has attracted attention for the mitigation of CO2 emissions. Among the dominant CO2 capture technologies, pressure swing Adsorption (PSA) is a promising alternative to amine-based absorption. However, its capture cost should be further decreased to facilitate its commercial implementation in industry. In this study, a novel low-cost PSA CO2 capture process based on self-heat recuperation technology is discussed. An energy balance of the conventional process and the proposed process is simulated and compared using a commercial process simulator (PRO/II ver. 9.1, Invensys). In the proposed PSA process, the exothermic heat of Adsorption is recuperated using a reaction heat trantransformer (RHT) and is recirculated for adsorbent regeneration. The waste residual gas<gas pressure can also be recovered by an expander at the top of an Adsorption Tower. The simulation results indicate that the energy consumption of the proposed PSA process is 40% that of the conventional process.

Yoshikawa Kunio – One of the best experts on this subject based on the ideXlab platform.

  • Pyrolysis gasification of dried sewage sludge in a combined screw and rotary kiln gasifier
    , 1
    Co-Authors: Chun, Young Nam, Kim, Seong Cheon, Yoshikawa Kunio
    Abstract:

    A pyrolysis gasifier, with carbonization and activation steps, was developed to convert dried sludge into activated char and gas fuel energy. To determine the optimal driving conditions, parametric investigations were conducted on the amount of steam input, pyrolysis gasifier temperature and moisture content in the dried sludge. The optimal conditions for the dried sludge were found to be a steam input of 10 mL/min, gasifier temperature of 820 °C and moisture content of 11% with a holding time in the pyrolysis gasifier of 1 h. The specific area of the activated char was 40.1 m2/g, with an average pore diameter and volume of 63.49 Šand 0.2354 cm3/g, respectively. The pyrolysis gases were H2 (34.1%), CO (18.6%), CH4 (8.5%) and CO2 (8%). The higher heating value for the pyrolysis gas was 10,107 kJ/N m3. To determine the tar Adsorption characteristics, a benzene Adsorption test was conducted using a fixed bed Adsorption Tower (H/D = 2, GHSV = 1175/h). The saturation point of the activated char was found after 45 min, and the amount of Adsorption was 140 mg/g. Therefore, the pyrolysis gasification of sewage sludge can produce activated char which can be used to reduce tar, and gasification gas which can be utilized as a high enthalpy gas fuel.Gasification Pyrolysis gas Sewage sludge Activated char Rotary kiln gasifier

Indu Shekhar Thakur – One of the best experts on this subject based on the ideXlab platform.

  • Characterization of leaf waste based biochar for cost effective hydrogen sulphide removal from biogas
    Bioresource Technology, 2018
    Co-Authors: Shivali Sahota, Virendra Kumar Vijay, P.m.v. Subbarao, Ram Chandra, Pooja Ghosh, Goldy Shah, Rimika Kapoor, Vandit Vijay, Vaibhav Koutu, Indu Shekhar Thakur
    Abstract:

    Installation of decentralized units for biogas production along with indigenous upgradation systems can be an effective approach to meet growing energy demands of the rural population. Therefore, readily available leaf waste was used to prepare biochar at different temperatures and employed for H2S removal from biogas produced via anaerobic digestion plant. It is found that biochar prepared via carbonization of leaf waste at 400 °C effectively removes 84.2% H2S (from 1254 ppm to 201 ppm) from raw biogas for 25 min in a continuous Adsorption Tower. Subsequently, leaf waste biochar compositional, textural and morphological properties before and after H2S Adsorption have been analyzed using proximate analysis, CHNS, BET surface area, FTIR, XRD, and SEM-EDX. It is found that BET surface area, pore size, and textural properties of leaf waste biochar plays a crucial role in H2S removal from the biogas.