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Journal of the Japan Institute of Energy
Vol. 99 (2020), No. 9

Journal of the Japan Institute of Energy Vol. 99 (2020), No. 9

An Environmental Analysis of Bio-H₂ Production Introducing the 2-step PSA and Waste Heat Recovery

Haruka NAKAYAMA, Mitsuo KAMEYAMA, Yin LONG, Kiyoshi DOWAKI

pp. 129-135

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An Environmental Analysis of Bio-H₂ Production Introducing the 2-step PSA and Waste Heat Recovery

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DOI:10.3775/jie.99.129

Abstract

Hydrogen (H₂) is expected to be one of the most promising secondary energy resources that can contribute to the mitigation of global warming. H₂ can be synthesized from biomass feedstock as Bio-H₂, which can contribute to greenhouse gas emission mitigation. However, the low energy density of Biomass limits the collection of the feedstock based on the life-cycle assessment methodology. Furthermore, for successful operation, small-scale Bio-H₂ plants must be used. Thus, a Bio-H₂ plant faces two challenges: 1) the need for auxiliary power negatively affects production efficiency and increases eco-burden. In particular, pressure swing adsorption (PSA) used for H₂ purification requires high power consumption, 2) a large amount of heat is lost. To overcome these limitations, we improved a previous Bio-H₂ plant by introducing 2-step PSA and a waste heat recovery system (WHR) to reduce the auxiliary power consumption and to compensate the auxiliary power demand. It was found that, the improved plant reduced the auxiliary power demand by 18.9%, and 7.2% of the required power was compensated by the WHR system. Furthermore, all environmental indicators were improved compared to those for the conventional plant.
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3. Sorption Behaviors of SO₂ and NH₃ Gases on Sewage Sludge Char Journal of the Japan Institute of Energy Vol.99(2020), No.9
Ammonia Adsorption Properties of Natural Soil Adsorbent for Biohydrogen Purification

Seiya KAKO, Masaya SUZUKI, Mitsuo KAMEYAMA, Yin LONG, Kiyoshi DOWAKI

pp. 136-142

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Ammonia Adsorption Properties of Natural Soil Adsorbent for Biohydrogen Purification

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DOI:10.3775/jie.99.136

Abstract

In this study, we focused on the purification of biohydrogen by indirect pyrolysis. Syngas typically contains small amounts of impurities (e.g., NH₃), which negatively affect the fuel cell operation. Earlier, our group has developed removal technologies using solid adsorbents. Additionally, we estimated the adsorption performance considering environmental aspects based on life cycle assessment. In this study, we focused on the NH₃ removal capacities of two different adsorbents: hydroxyl aluminum silicate clay (HAS-Clay) and natural clay (KanumaClay). We fabricated an experimental apparatus to evaluate the adsorption performance. The results show that the maximum adsorption of HAS-Clay is 2.90 g NH₃/100 g sorbent, whereas a maximum adsorption of 2.02 g NH₃/100 g sorbent was obtained by using Kanuma-Clay. Both adsorbents have the same allophane composition, which contributes to the adsorption performance. However, the environmental impacts of HAS-Clay and Kanuma-Clay differ. Thus, we evaluated their eco-burdens on the NH₃ removal.
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1. Oil Palm Empty Fruit Bunch as a Promising Feedstock for Biorefinery Products: A Holistic Approach with Economic, Energy, and Environmental Consideration Journal of the Japan Institute of Energy Vol.99(2020), No.9
2. Thermal Designing of an Inner Cathode Type Alkali Metal Thermal to Electric Conversion (AMTEC) Cell Journal of the Japan Institute of Energy Vol.98(2019), No.11
3. Homogenization of Heavy Tar and Plastics by Thermal Co-treatment to Prepare Liquid Fuel Feedstock Journal of the Japan Institute of Energy Vol.98(2019), No.11
Oil Palm Empty Fruit Bunch as a Promising Feedstock for Biorefinery Products: A Holistic Approach with Economic, Energy, and Environmental Consideration

Agusta Samodra PUTRA, Ryozo NOGUCHI, Tofael AHAMED, Hiroshi OHI

pp. 143-152

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Oil Palm Empty Fruit Bunch as a Promising Feedstock for Biorefinery Products: A Holistic Approach with Economic, Energy, and Environmental Consideration

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DOI:10.3775/jie.99.143

Abstract

The oil palm empty fruit bunch (EFB) is a rich carbon-source material that can be considered as a valuable candidate for several applications. Recently, EFB has been used as an organic compost fertilizer in oil palm plantations. The life cycle assessment (LCA), life cycle cost (LCC), and cumulative energy demand (CED) were used to evaluate the feasibility of EFB as a raw material for dissolving pulp and furfural co-production. An additional techno-economic assessment was performed on realistic industrial-scale process conditions for cost calculation. In the production of 1 kg dissolving pulp with the co-production of 0.01 kg furfural, -1.218 kg CO2 eq of global warming potential (GWP100), -0.006 kg SO₂ eq of acidification potential (AP), -0.002 kg PO₄^3- eq of eutrophication potential (EP), -0.054 kg 1,4-DB eq of human toxicity potential (HTP) and 1.887 MJ of cumulative energy demand (CED) were generated. The economic assessment indicated that the production of 1 kg dissolving pulp in the proposed product system resulted in earnings of 71.11 JPY based on LCC methodology and earnings of 54.44 JPY in the techno-economic assessment simulation after 15 years. The application of the waste-to-product concept for EFB via biorefinery processes, such as dissolving pulp and furfural co-production, offer advantages in terms of economic, environmental, and energy requirements.
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3. Sorption Behaviors of SO₂ and NH₃ Gases on Sewage Sludge Char Journal of the Japan Institute of Energy Vol.99(2020), No.9
Environmental Assessment on Paper Sludge to Electricity in Paper Mills in Thailand

Michino HASHIZUME, Chinnathan AREEPRASERT, Koji TOKIMATSU

pp. 153-157

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Environmental Assessment on Paper Sludge to Electricity in Paper Mills in Thailand

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DOI:10.3775/jie.99.153

Abstract

In the paper production industry, typically, waste from the papermaking process, such as woody waste, waste reject, and paper sludge, is used for internal energy recovery. Our research focuses on paper sludge that has high moisture content. Our previous study that showed that hydrothermal treatment can convert paper sludge into solid fuel. In this study, we calculated the CO₂ emissions from the paper sludge valorization to generate electricity in actual paper mills in Thailand. As a result, when hydrothermal treatment was applied on paper sludge and the product was cofired with coal, it was better in terms of an environmental perspective and technical feasibility in the case of the small- and medium-size boilers, 50 and 80 t/h.
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Readers Who Read This Article Also Read
1. Oil Palm Empty Fruit Bunch as a Promising Feedstock for Biorefinery Products: A Holistic Approach with Economic, Energy, and Environmental Consideration Journal of the Japan Institute of Energy Vol.99(2020), No.9
2. Thermal Designing of an Inner Cathode Type Alkali Metal Thermal to Electric Conversion (AMTEC) Cell Journal of the Japan Institute of Energy Vol.98(2019), No.11
3. Homogenization of Heavy Tar and Plastics by Thermal Co-treatment to Prepare Liquid Fuel Feedstock Journal of the Japan Institute of Energy Vol.98(2019), No.11
Sorption Behaviors of SO₂ and NH₃ Gases on Sewage Sludge Char

Kazuhiro KUMABE, Kohki HATTORI, Masafumi CHISHIMA, Hiroshi MORITOMI

pp. 158-164

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Sorption Behaviors of SO₂ and NH₃ Gases on Sewage Sludge Char

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DOI:10.3775/jie.99.158

Abstract

The sorption behaviors of SO₂ and NH₃ gases on sewage sludge char were investigated using a commercial thermodynamic equilibrium calculation software and lab-scale fixed-bed reactor in order to develop the desulfurization and deodorization technologies in the new energy saving sludge treatment system combining with bio-drying and carbonization technologies. The enthalpy change of the neutralization reaction of SO₂ with NH₃ (SO₂ + 2NH₃ + H₂O + 1/2O₂ = (NH₄)₂SO₄) was calculated to result in being a lower enthalpy change with a lower temperature. The results show in the thermodynamic equilibrium state of 2SO₂, 4NH₃, 2H₂O, and O₂ to form (NH₄)₂SO₄ as solid-phase species under the conditions from 0 to 200°C. The gas activation of the char and a longer space time of SO₂ and NH₃ gases in the char increased the sorbed amounts of the gases into the char. The molar ratio of NH₃ to SO₂ in a feed gas to be 2, which is the stoichiometric molar ratio for the formation of ammonium sulfate, was the better condition for the gas-phase reaction and gas sorption of SO₂ and NH₃ gases into the char.
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3. Homogenization of Heavy Tar and Plastics by Thermal Co-treatment to Prepare Liquid Fuel Feedstock Journal of the Japan Institute of Energy Vol.98(2019), No.11
Table of Contents (in English)

p. 9909tce_1

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Table of Contents (in English)

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DOI:10.3775/jie.99.9909tce_1
Table of Contents (in Japanese)

p. 9909tcj_1

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Table of Contents (in Japanese)

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DOI:10.3775/jie.99.9909tcj_1
Guest editors for Special articles: Asian Conference on Biomass Science

p. GEAB_I_1

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Guest editors for Special articles: Asian Conference on Biomass Science

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DOI:10.3775/jie.99.GEAB_I_1

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