Yasunori Kikuchi

Yasunori Kikuchi
The University of Tokyo | Todai · Institute for Future Initiatives

Ph.D.

About

144
Publications
19,236
Reads
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890
Citations
Additional affiliations
April 2018 - present
The University of Tokyo
Position
  • Professor (Associate)
October 2016 - February 2018
Tokyo Institute of Technology
Position
  • Professor (Associate)
October 2016 - March 2018
National Institute for Materials Science
Position
  • Researcher

Publications

Publications (144)
Article
Recently, polygeneration in the sugarcane industry, which produces not only raw sugar but also other products (ethanol and electricity), has been attracting attention for green economy via the utilization of local natural resources. We focus on “heat” as a polygeneration method for the sugarcane industry. This study describes a thermal energy stora...
Article
The decarbonization of industrial heat, especially utilization process heat over 100 °C, is important for the transition to a sustainable society, including climate change mitigation and the transition to a circular economy. This study focused on a mobile thermal energy storage system for industrial use using a zeolite water vapor adsorption and de...
Article
Full-text available
Palm kernel shell (PKS) is a by-product in palm oil milling during the extraction of crude palm oil from fresh fruit bunches. PKS is a promising solid fuel to replace coal with its high calorific value. As Japan is moving towards renewable power to reduce carbon dioxide emissions, importing biomass as fuel sources is trending. In the past decade, P...
Article
An energy analysis of methanol production via low-temperature chemical looping steam reforming was performed based on the process design; the potential benefits in reducing fuel consumption and excess heat generation were analysed. The feasibility of performing chemical looping reforming at temperatures lower than the conventional 900 °C is linked...
Article
To achieve a decarbonized society and sustainable goals, there is an urgent need to expand the use of industrial unused heat and renewable energy. In order to expand the flexibility of utilization of unused heat, it is necessary to develop a thermal energy storage and transport system that can resolve the spatiotemporal gap between generating unuse...
Article
This series of papers addresses the recycling of cathode particles and aluminum (Al) foil from positive electrode sheet (PE sheet) dismantled from spent lithium-ion batteries (LIBs) by applying a high-voltage pulsed discharge. As concluded in Part I of the series (Tokoro et al., 2021), cathode particles and Al foil were separated in water based on...
Article
Full-text available
This study deals with the possible range of life cycle greenhouse gas emissions (LC-GHG) from acetylated cellulose nanofiber-reinforced polylactic acid (AcCNF/PLA) production processes, considering future scaling-up, process improvement, and variations in their process modeling and simulation. The chemical and mechanical processes required for brea...
Article
The implementation of energy carriers, such as hydrogen, is an option for future sustainable energy systems with decentralized renewable resources. Such an implementation requires holistic system changes from energy production to end-use technologies over multiple sectors; thus, for an effective implementation of the energy carriers, region priorit...
Article
To enable effective reuse and recycling processes of spent lithium-ion batteries (LiBs), here we develop a novel electrical method based on a high-voltage pulsed discharge to separate cathode particles and aluminum (Al) foil. A cathode particle sample was mechanically separated from a LiB, cut into 30-mm × 80-mm test pieces, and subjected to a high...
Article
The implementation of energy systems and technologies has been incentivized by the assessment of various aspects, including social and economic acceptance and sharing rational technology targets. In this study, battery-assisted hydrogen production systems were analyzed with regard to their environmental and techno-economic aspects. The costs of hyd...
Article
Local governments are required to implement measures that take advantage of regional characteristics in order to solve complex social issues such as low birthrate and an aging population, climate change and biodiversity. Although the regional input-output table (RIO) is one of the most useful tools for analyzing the characteristics of the region an...
Article
Full-text available
Earlier introduction and diffusion of emerging technologies is quite necessary for achieving decarbonization target by 2050. However, many emerging technologies are still in development, while the actual decarbonization effects from implementing the technologies in the future are also uncertain. For designing an appropriate roadmap of these technol...
Article
The coproduction of glucan and mannan from yeast extract residue was examined by clarifying the material balance and energy consumption at the factory scale. As final products, yeast glucan and yeast mannan with purities of 46.2% and 50.9% were obtained at 92.6% and 65.9% yields, respectively. This result demonstrated that glucan and mannan can be...
Article
The volume of spent photovoltaic (PV) panels is expected to grow exponentially in future decades. Substantial material resources such as silver (Ag), copper (Cu), aluminum (Al), silicon (Si), and glass can potentially be recovered from silicon-based PV panels. In this paper, we targeted the recovery of Cu and Ag from a cell sheet separated to a gla...
Chapter
District heating is thought as an important part of future energy system because of the easier accessibility to renewables and waste heat sources. Despite facing the problems such as rapid efficiency improvement in individual heating and energy-saving activities, the overall energy efficiency of district heating is higher than individual heating. W...
Article
Full-text available
Bioenergy has been promoted in Japan with ambitious targets. However, the incentive schemes excluded renewable heat and overlooked synergies with local forest management, leading to the development of large-scale biomass plants that heavily rely on overseas biomass supplies. This case report discussed an alternative scenario of decentralised bioene...
Article
Full-text available
Japan is faced with sustainability challenges such as resource security and depopulation. Well-coordinated, multifaceted actions including a shift from imported fossil to locally available renewable resources and empowering of rural areas are vital in tackling these challenges. Here, we present our co-learning approach to practice the multifaceted...
Article
Full-text available
Since the enactment of the “Feed-in Tariff” scheme in 2012, the solar power generation capacity in Japan has been steadily growing. Therefore, in the near future, the demand for the mass processing of spent photovoltaic (PV) panels is expected to increase. Secondary batteries, especially lithium-ion batteries (LiBs), have become important products...
Article
Full-text available
For micro-grid cost-benefit analyses, both energy production and demand must be estimated on the long-term of one year. However, there remains a scarcity of studies predicting energy production and demand simultaneously and in the long-term. By means of programming in R and applying linear, non-linear, and support vector regression, we show the in...
Article
Power generation by variable renewable energy (VRE) is expected to expand for decarbonization, although it is difficult to ensure stabilization of the energy demand due to fluctuations in the power output from VRE. To accelerate VRE implementation, wind-powered thermal energy systems (WTth-ES), which can provide dispatchable power using wind–therma...
Article
Full-text available
Energy systems using renewables with adequate energy carriers are needed for sustainability. Before accelerating technology implementation for the transition to the new energy system, region‐specific implementation effects should be carefully examined as a system. In this study, we aim to analyze an energy system using hydrogen as an energy carrier...
Article
Plant-derived resources have become not just an option of raw materials, but also inevitable ones to mitigate fossils significantly. Especially, wood-derived resources are important in Japan due to the large domestic potentials. Life cycle thinking approaches are required for conversion technology options of wood-derived resources into products und...
Article
For addressing social issues through systematic design, not only the direct effects but also the indirect effects for the social issues should be taken into account in decision making. In this study, such effects of a health promotion event in Wakayama prefecture are discussed through socio-economic analysis applying input-output tables. The result...
Article
In Tanegashima, sugarcane cultivation and sugar manufacturing are main industry. The sugarcane bagasse from sugar manufacturing process is burned in bagasse boiler and supply heat and electricity demand in the sugar mill. The bagasse boiler exhaust unused heat about 200 °C during milling period due to combustion of excess sugarcane bagasse. In the...
Article
In Tanegashima, a sugar mill burns sugarcane bagasse as biomass fuel and exhausts a lot of unused heat about 200 oC during sugar milling period. On the other hand, many factories in the island require process steam about 120 oC through a year and now obtain this steam by burning imported heavy oil. Thermochemical energy storage and transport system...
Article
Thermochemical energy storage and transport system utilizing zeolite steam adsorption and desorption cycle is proposed to resolve spatial and seasonal thermal mismatch between unused heat source exhausted from a sugar mill operating winter to spring and heat demand in vicinal industry consuming imported heavy oil all year around in Tanegashima. Thi...
Article
Full-text available
The recovery of metal resources from urban mines such as waste electrical and electronic equipment (WEEE) has become an emerging issue. The establishment of technology and social systems for recycling rare metals is of especially high priority due to their worldwide shortage. This study tackles the recycling of rare metals, especially tantalum, by...
Article
The explosive increase in the state-of-the-art knowledge and case examples on life cycle assessment has made their comprehensive understandings much difficult. While the attainable system options on society, economic, and technology are complexly intertwined with each other, the viewpoints of their assessment have also been diversified. In this stu...
Article
Taking an approach with Input-Output (IO) models to analyze local socio-economic effects induced by implementation of technologies and policies requires localized IO Tables (IOTs) that better reflect regionally-specific economic structures. Because a complete localization is costly, it is necessary to prepare them with various assumptions on locali...
Article
Selective fermentation of reducing sugars in cane juice harnesses the advantageous productivity of high-yielding sugarcane cultivars for increasing products from limited arable land. Without this technology, the altered compositions of cane juice often lead to additional environmental impacts due to increased consumption of externally supplied ener...
Article
The utilization of low-temperature waste heat in the endothermic hydrocarbon reforming reaction can improve the energy efficiency of the chemical product synthesis system. In this study, process assessments are conducted, and potential technologies to realize the reforming process using low-temperature waste heat are discussed. Based on the assessm...
Article
In Tanegashima, an isolated island in Japan, a 1500 ton/day sugar mill produces raw sugar and residual bagasse simultaneously. The bagasse is burned to generate steam that drives power turbines, but the bagasse boiler burns more bagasse than that is required. Accordingly, the process has a high temperature flue gas and a sizeable amount of unused h...
Article
Japan faces serious energy issues such as high dependency on fossil resources from abroad and slow introduction of renewable energy. Although technological progress is urgently needed to solve these issues, consumers need to select energy in an appropriate way in terms of environmental and economic aspects. These actions require energy literacy whi...
Article
In evaluating technologies and systems, techno-economic analysis as well as life cycle assessment is of importance. In this paper, manufacturing cost, profit and business profitability evaluation are briefly introduced as an example of techno-economic analysis, and recent trends in techno-economic analysis in academic papers are showed by a bibliom...
Article
The massive implementation of renewable energy requires sophisticated assessments considering the combination of feasible technology options. In this study, a techno-economic analysis was conducted for hydrogen production from photovoltaic power generation (PV) utilizing a battery-assisted electrolyzer. The installed capacity of each component tech...
Article
This paper assesses the alternative sugarcane-based industrial systems concerning changes in productivity, the greenhouse gas (GHG) emission intensities of products and the reduction potential of GHG emission compared with the current sugar producing system. The following two systems are assessed; (Case A) Conventionally proposed system to produce...
Article
Full-text available
Thermochemical energy storage and transport system utilizing zeolite steam adsorption and desorption cycle is one of the methods to resolve the mismatch between industrial surplus heat and heat demands. To generate 60 °C hot water utilizing zeolite 13X, zeolite boiler employing moving bed and indirect heat exchanger was developed. Pressurized water...
Article
Full-text available
In the recently proposed integrated approach for designing the entire agro-industrial process, there has been a lack of consideration on interannual meteorological variability consequences on production for particular plant cultivars/varieties grown at a specific region. In this study, we discuss how this shortcoming influences the simulation of pr...
Article
In consideration of forthcoming amendments to laws and regulations about Japan's energy systems, we conducted a socio-technical analysis to support discussions towards a consensus on socially acceptable and technologically feasible energy systems for Japan. Using a choice experiment survey, we analysed consumer preferences about the electricity sup...
Article
The power systems of the remote islands lying south of Kyushu Island in Japan consist of mutually isolated mi-crogrids, and the islands’ location places them at a disadvantage in terms of thermal power generation cost and the security of fossil resources. However, many of the islands have power plants in cane sugar mills that have the potential to...
Article
Full-text available
Bioethanol production using sugarcane as a raw material is effective in reducing greenhouse gas emissions but may be problematic in competing for the raw material for sugar production. A simulation in an earlier study demonstrated that sugar and ethanol production can be both increased by simultaneously introducing two technologies, high yielding s...
Article
A comprehensive analysis of multiple aspects of food production is needed to address related concerns, such as the use of nitrogen, phosphorus, and potassium fertilizers, the consumption of water, the occupation or transformation of land, and greenhouse gas emissions. We examine the environmental properties of plant factories with sunlight and plan...
Chapter
Socio-economic aspects of technology implementation should be carefully examined in the design of regional energy systems. In this paper, we conducted a computer-aided socio-economic analysis on regional energy systems in isolated islands. Existing developed models were simultaneously utilized for characterizing the applicable technology options. A...
Chapter
The effective utilization of sewage sludge has attracted increasing attention, so various technologies are under vigorous research and developments. However, the discussion of general applicability and effectiveness of those technologies throughout diverse regions are not sufficient due to the limitation of regional data of existent sewage sludge t...
Chapter
Unused renewable resources can be collected in some regions as, for example, agricultural or forestry residues. To corroborate such locally available resources with energy systems mainly composed of fossil resources, technologies for their sourcing, transferring, storing, and operating should be systematically selected and integrated into a system....
Article
The sugar mill in Tanegashima burns sugarcane bagasse as a fuel of in-house power and heat source and ineluctably generates a massive amount of unused heat around 200°C. On the other hand, many factories in Tanegashima uses oil-fired boilers to generate a process steam up to 120°C all year around. In order to resolve this spatial and seasonal misma...
Article
In Tanegashima, milling of sugarcane is one of the main industries, and bagasse is burned at the bagasse boiler as biomass energy to generate steam for the sugar milling operation. However, bagasse is burned more than necessary due to management of the bagasse. Consequently, temperature of flue gas remains high and a large amount of unused heat aro...
Article
A new energy system using adequate energy carriers such as hydrogen is needed for filling out the spatial and temporal gaps in energy supply and demand to promote renewable-derived energy systems. The environmental implementation effects of technologies associated with energy carriers should be carefully examined because the conditions of the suppl...
Article
The objective of this research is to develop an environmental information provision approach for supporting consumers’ life cycle thinking (LCT). We developed an environmental education program for junior high-school students, and a scenario analysis software to evaluate environmental impacts associated with consumers’ product use. The effectivenes...
Article
Industrial symbiosis is an option to reduce waste and to improve resource productivity by exchanging usable wastes or byproducts between neighboring industries. While case examples of industrial symbiosis have mainly been conducted in industrial areas, the application of industrial symbiosis to rural areas should be carefully examined as a means to...
Article
Polyethylene (PE) and polypropylene (PP) can be synthesized from biomass through dehydration, dimerization, and metathesis reactions from ethanol or methanol-to-olefin reaction of synthesis gas. This paper examines the socioeconomic aspects of such biomass-derived resin production, which are composed of environmental impacts quantified by life cycl...
Conference Paper
In the sugar mill in Tanegashima which is an isolated island in Japan, raw sugar production process produces raw sugar and bagasse simultaneously. Raw bagasse is not storable because of its perishability due to high moisture content. Actually, the bagasse boiler burns more bagasse than that is required for the sugar mill. Hence, the temperature of...
Article
Biomass has become a renewable resource for energy, but it needs continuous management to make it truly renewable. Planted forests in particular areas in the world are facing the challenges of reformation because of the severe maldistribution of forest age-classes caused by a stagnation in demand for wood or degradation by past deforestation. In th...
Article
The design of energy systems has become an issue of worldwide interest. A single optimal energy system cannot be suggested because the availability of infrastructure and resources, and the acceptability of the system should be discussed locally with the involvement of all related stakeholders. A simulation-based approach is strongly needed for such...
Article
Owing to the growing number of risk factors that can be triggered by natural and manmade disasters, management of disruption risks in supply chains has become increasingly significant. Since the market concentration of raw material suppliers is a determinant of the supply disruption risk, identification of raw materials vital in a supply chain and...
Chapter
This paper performed the design of rural energy system by industrial symbiosis considering long-term availability of forest resources. As for the case examples, alternatives of energy system in Tanegashima, a remote island in Japan, were examined, where two types of combined heating and power (CHP) were designed. In the first option, bagasse-based...
Chapter
Although a three-boiling system has been commonly chosen as a procedure for sugar crystallization in sugar mills, its operation parameters such as the dividing and the mixing ratio of syrup and molasses have empirically decided on the equipment capacity and the quality of syrup. In this study, the relationship among the quality of syrup, the utiliz...
Chapter
We conducted a computer-aided socio-technical analysis on national and regional energy systems. Existing developed models were simultaneously utilized for characterizing the possible solutions of energy systems with the available technology roadmaps. At the same time, we analysed consumers’ preferences about the electricity supply through preferenc...
Chapter
Life cycle assessment (LCA) is a strong tool to quantify the environmental impacts attributable to a life cycle of products and services. Indoor farming plants can play various roles in agricultural production, which should be taken into account in the comparative analysis as to whether open farming or indoor farming, which products should be produ...
Chapter
Sustainability assessment can be quite advantageous in the early stages of process design, where a vast number of alternatives are screened and changes are easier to implement. Among various sustainability assessment frameworks for process design, the life cycle assessment (LCA) is widely used for the environmental impact of normal process operatio...
Chapter
A lot of technologies to convert biomass resources into products in high efficiency have been studied within industrial fields without focusing on biomass-acquiring stages in agriculture. The global optimization within a supply chain including biomass-derived production must be based on available agricultural and industrial technology options, wher...
Chapter
We developed a method for analysing scenarios of future energy systems implementing a variety of feasible technology options based on an energy flow model. The model was modularized and represented as functionals of appropriate technology options, which enables the aggregation and disaggregation of energy systems by defining functionals for single...
Article
Full-text available
Selective fermentation of reducing sugars in mixed saccharides is an emerging key technology for productivity enhancement utilizing high-yielding sugarcane cultivars in cane sugar mills coproducing sugar, ethanol and electricity. In this paper, a sophisticated analysis on the heat exchanger networks for inlet and outlet of selective fermentation is...
Article
Sugar production is the main industry in Tanegashima, Japan. Whilst the sugar mill recycles sugarcane bagasse as a fuel, it concurrently generates large amounts of unused 200 °C heat during operation. Raw sugar is shipped to a refinery in Osaka for the final stages of production, which uses a city gas boiler to continuously generate a large quantit...
Article
Bioethanol production from molasses has advantages in greenhouse gas emissions because of its energy acquisition from bagasse. However, the improvement of bioethanol productivity is challenging; while each elemental technology option can be greatly improved, the trade-offs between the production of raw sugar and bioethanol are complex. This issue s...
Article
Although small and medium-sized enterprises (SMEs) play an important role in economy and use a significant amount of chemicals in their manufacturing processes, little support has been offered in their process improvement for chemicals management. In this series of two papers, we proposed a design support framework for strategic chemicals managemen...
Chapter
Full-text available
Japan is at a momentous turning point in world history and faces a wide range of social issues that call for proactive solutions, such as the control of environmental loads, countermeasures against rapid population aging and stagnant birthrates, and the construction of sustainable energy systems. These issues have resulted from its mature society,...
Chapter
Excessively rapid socioeconomic changes in Japan have disrupted national policies related to the management of biomass resources. During the twentieth century, the Japanese forestry and wood industry transformed from producing wood for fuel to wood for construction to support national reconstruction in the postwar era. During this period, conifers...
Chapter
The food self-sufficiency ratio in Japan based on caloric supply was 39 % in 2013, which is the lowest level among major developed countries. To achieve sustainable food supply in the future, state-of-the-art technologies should be combined to stabilize food production, increase productivity per resource, and ensure greater safety. This should be d...