Faculty Profiles - NARUSE Ichiro

Papers - NARUSE Ichiro

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P-3-2 Elucidation of gasification behavior of various biomass

SHIRATO Daisuke, YOSHIIE Ryo, UEKI Yasuaki, NARUSE Ichiro

Proceedings of the Annual Conference of The Japan Institute of Energy Vol. 28 ( 0 ) page： 248 - 249 2019.7

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Institute of Energy

In recent years, due to problems of fossil fuel depletion and global warming, biomass has attracted attention as an alternative energy source. So we focused on biomass gasification. In this study, gasification experiments of three types of biomass are conducted as preliminary experiments of gasification by packed bed gasifier. Assuming that the gas produced when each sample burns completely is assumed as a gasifying agent, the mass loss and gas yield of the sample during gasification were measured.

DOI： 10.20550/jietaikaiyoushi.28.0_248

CiNii Research

P-3-9 Effect of mixing various biomasses on combustion behaviors of biomass

KATO Koki, UEKI Yasuaki, YOSHIIE Ryo, NARUSE Ichiro, NARUKAWA Kimihito, MORII Kazuhiko

Proceedings of the Annual Conference of The Japan Institute of Energy Vol. 28 ( 0 ) page： 262 - 263 2019.7

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Institute of Energy

Biomass is attracting attention as an alternative energy of fossil fuel. It is expected that the use of woody biomass will increase in the future. In order to use biomass efficiently as fuel, it is necessary to clarify its combustion characteristics. So, in this study, in order to clarify the combustion characteristic of biomass, pyrolysis and combustion experiment during the temperature rising process of two kinds of biomass were conducted by using the thermogravimetric analyzer. Two kinds of woody biomass were used as experimental samples. The effects of mixing each biomass on the combustion behavior of woody biomass were discussed.

DOI： 10.20550/jietaikaiyoushi.28.0_262

CiNii Research

Oxygen chemisorption of sub-bituminous coal at temperature

Yoshiie R., Ueki Y., Naruse I.

12th Asia-Pacific Conference on Combustion, ASPACC 2019 2019

Language：English Publishing type：Research paper (scientific journal) Publisher：12th Asia-Pacific Conference on Combustion, ASPACC 2019

The effective utilization of sub-bituminous coals has been extended as an energy source for power generation because of their low cost and long minable years. However, sub-bituminous coal may undergo spontaneous combustion owing to high reactivity with oxygen in low-temperature air compared with bituminous coal. Therefore, the objective of this study is to elucidate the low-temperature oxidation behaviors of sub-bituminous coal. In particular, transition from oxygen chemisorption to low-temperature oxidation of sub-bituminous coal has been experimentally examined in detail. Isothermal gravimetric analyses are conducted for several bituminous and sub-bituminous coal samples at temperatures varying between 356 K and 476 K in oxygen-enriched air. The chemical compositions of emission gas are continuously monitored under low-temperature oxidation conditions. The experimental results show that the mass of all tested coals, including those of bituminous and sub-bituminous coals, increases at temperatures below 426 K as a result of oxygen chemisorption. At 476 K, the mass of sub-bituminous coal increases slightly with low H2 and CO2 emissions at the beginning and subsequently decreases with high CO and CO2 emissions. This mass change indicates that the transition from oxygen chemisorption to low-temperature oxidation occurs during this period.

Scopus

High efficiency operation by biomass gasification gas dilution spark ignition engine

CHINO Mitsuki, KUBO Naoki, KOBAYASHI Jun, NARUSE Ichiro

The Proceedings of Mechanical Engineering Congress, Japan Vol. 2019 ( 0 ) page： J07108P 2019

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers

Low temperature combustion due to dilution of intake air using inert gas is one of the effective methods for heat loss reduction of the engine. However, the combustion velocity almost decreases due to high dilution and that is the reason why a misfire occurs. To prevent the misfire due to reduction of the combustion velocity, application of a biomass gasified gas containing both hydrogen and inert gas to dilution was proposed. Dilution gas in which hydrogen was added to the inert gas was introduced into the engine. And it was suggested that the efficiency be improved.

DOI： 10.1299/jsmemecj.2019.j07108p

CiNii Research

NOx formation behaviors in char combustion of waste incineration process

TSUKAMOTO Kazutaka, YOSHIIE Ryo, NARUSE Ichiro, UEKI Yasuaki, DENDA Tomohiro, USUKI Taichi

The Proceedings of the Symposium on Environmental Engineering Vol. 2019.29 ( 0 ) page： J206 2019

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers

An incineration process is the most dominant method of the waste disposal in Japan. A stoker furnace is widely used for the waste incineration. Recently, in the stoker furnace, low air ratio and high temperature incineration have been applied increasingly. However, they result in the increase in the amount of air pollutant NOx generated due to flame instability. Especially, it is difficult to control NOx production in char combustion. In this research, in order to evaluate the NOx generation mechanisms in char combustion of waste incineration process, RDF char burning experiments were carried out, investigating the combustion behaviors and exhaust gas compositions. The incineration experiments were conducted at different temperatures and gas conditions such as O2, CO2, steam, EGR(Exhaust gas recirculation). The char-NOx production behavior showed different behaviors depending on experiment conditions. In particular at the steam gas and EGR conditions, the char-NOx concentration was very high due to the steam gas shift reaction.

DOI： 10.1299/jsmeenv.2019.29.j206

CiNii Research

Combustion Technologies of Wastes as One of Local Energy Resources

NARUSE Ichiro

Nihon Enerugii Gakkai Kikanshi Enermix Vol. 97 ( 6 ) page： 623 - 630 2018.11

Synergistic effect of thermal cracking/partial oxidation/catalytic reforming by char on tar removal in a fluidized bed two-stage gasification process of industrial biomass

Ueki Yasuaki, Zeng Xi, Naruse Ichiro, Yoshiie Ryo, Han Zhennan, Xu Guangwen

Proceedings of the Annual Conference of Japan Society of Material Cycles and Waste Management Vol. 29 ( 0 ) page： 597 2018

Language：English Publishing type：Research paper (scientific journal) Publisher：Japan Society of Material Cycles and Waste Management

Industrial biomass is the byproduct of light-industry, such as spirit lees, herb residue, bagasse and so on. It is not only a kind of biomass resource, but also a serious environmental pollution source. Gasification is promising and attractive because of cleanness, high efficiency and large treating capacity. However, due to high content of moisture, nitrogen, and organic residue, the existing direct gasification process faces challenges, such as low efficiency, large temperature fluctuation and high tar content in fuel gas. So, innovating gasification process and reactor structure become essential and necessary. In this study, a new fluidized bed two-stage (FBTS) gasification process, mainly consisting of a fluidized bed (FB) pyrolyzer and a transport fluidized bed (TFB) gasifier, has been proposed by the Institute of Process Engineering, Chinese Academy of Sciences. This process decouples direct gasification process into two sub-processes, namely feedstock pyrolysis and char gasification. Depending on thermal cracking, partial oxidation and catalytic reforming by char, the produced tar will be removed to a very low level. To research and develop the FBTS gasification process successfully, the synergistic effect of thermal cracking, partial oxidation and catalytic reforming by char was examined systematically on a laboratory FBTS reaction apparatus.

DOI： 10.14912/jsmcwm.29.0_597

CiNii Research

Oxidation and Capture Mechanism of Mercury by the De-NOx Catalyst

YOSHIIE Ryo, SAKAIDA Masaya, UEKI Yasuaki, NARUSE Ichiro

The Proceedings of Conference of Tokai Branch Vol. 2018.67 ( 0 ) page： 528 2018

Oxidation, Absorption and Desorption Mechanisms of Mercury by the De-NOx Catalyst

YOSHIIE Ryo, SAKAIDA Masaya, UEKI Yasuaki, NARUSE Ichiro

The Proceedings of the Symposium on Environmental Engineering Vol. 2018.28 ( 0 ) page： 307 2018

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers

The Minamata Convention on Mercury was adopted in 2013, and regulations on mercury emissions are becoming stricter all over the world. Coal combustion is one of the major mercury emission sources. The majority of mercury emissions from coal combustion is in elemental mercury. This is because elemental mercury is water-insoluble, although oxidized mercury is water-soluble and easily captured by wet scrubbing systems. In this study, we expected the De-NOx catalyst to have a mercury oxidation/capture performance and conducted mercury oxidation/capture experiment using the De-NOx catalyst as a sorbent. In the result, when HCl existed in the atmosphere, the De-NOx catalyst oxidized all of vapor mercury. On the other hand, when HCl existed in the atmosphere, the De-NOx catalyst showed high mercury capture performance. Furthermore, De-NOx catalyst maintained high mercury capture performance at a high temperature (743 K)

DOI： 10.1299/jsmeenv.2018.28.307

CiNii Research

Elucidation of the NOx generation in waste incineration processes

Tsukamoto Kazutaka, Yoshiie Ryo, Naruse Ichiro, Ueki Yasuaki, denda Tomohiro, Usuki Taichi

Proceedings of the Annual Conference of Japan Society of Material Cycles and Waste Management Vol. 29 ( 0 ) page： 309 2018

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Material Cycles and Waste Management

An incineration process is the most dominant method of the waste disposal in Japan. A stoker furnace is widely used for the waste incineration. Recently, in the stoker furnace, low air ratio and high temperature incineration have been applied increasingly. However, they result in the increase in the amount of air pollutant NOx and greenhouse gas N2O generated due to flame instability. In this research, in order to clarify the NOx generation mechanisms in the waste incineration, RDF burning experiments were carried out, investigating the combustion behaviors and exhaust gas compositions. Mass reduction of RDF proceeded faster with higher temperature. NOx concentration in exhaust gas was found to decrease with increase in temperature. It might result from the strong reduction atmosphere generated around RDF fuel. In addition, RDF burning simulation was carried out, using elemental reaction kinetics. It was found that most of HCN and NH3 at high temperature was converted to NO, N2O and N2.

DOI： 10.14912/jsmcwm.29.0_309

CiNii Research

Examination of the Reduced Reaction Mechanism for NOx Concentration Prediction in a Waste Incinerator

Denda Tomohiro, Usuki Taichi, Ueki Yasuaki, Yoshiie Ryo, Naruse Ichiro

Proceedings of the Annual Conference of Japan Society of Material Cycles and Waste Management Vol. 29 ( 0 ) page： 301 2018

Examination of the Reduced Reaction Mechanism for NOx Concentration Prediction in a Waste Incinerator

DENDA Tomohiro, USUKI Taichi, UEKI Yasuaki, YOSHIIE Ryo, NARUASE Ichiro

The Proceedings of the Symposium on Environmental Engineering Vol. 2018.28 ( 0 ) page： 205 2018

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers

We have developed the technique of numerical simulation which uses the reduced reaction mechanism to predict the combustion behavior in a waste incinerator. In this paper, we newly made the reduced reaction mechanism “N916” (34 species, 76 reactions) for NOx concentration prediction by benchmarking GRI-Mech3.0 (50 species, 326 reactions) which is the typical combustion reaction mechanism. In order to examine the precision of N916, we calculated temperature and NOx concentration distribution in two-dimensional diffusion flame by using N916 and GRI-Mech3.0. The results showed that temperature and NOx concentration distributions were similar and the rate of divergence of NOx concentration value on center axis in the flame was almost 10%. There is a possibility that N916 is able to be used as the substitution for GRI-Mech3.0 in numerical simulation.

DOI： 10.1299/jsmeenv.2018.28.205

CiNii Research

Contacts with “Funryu”

NARUSE Ichiro

Nihon Enerugii Gakkai Kikanshi Enermix Vol. 96 ( 3 ) page： 234 2017

P-1-2 Modeling of coalescence and detachment behaviors of ash particle in pulverized coal combustion

MATSUYAMA Tatsuya, UEKI Yasuaki, YOSHIIE Ryo, NARUSE Ichiro

Proceedings of the Annual Conference of The Japan Institute of Energy Vol. 26 ( 0 ) page： 256 - 257 2017

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Institute of Energy

One of major problems in pulverized coal combustion process is ash deposition which causes corrosion of the heat transfer tube, decrease in the heat exchange rate, blockage of the gas flow path, etc. The properties of ash particle such as particle number, particle diameter and elemental composition are very important factors to predict and control such ash deposition phenomena. Moreover, it is also important to distinguish whether an ash particle is Included Mineral (IM) or Excluded Mineral (EM). In this study, we made the models of single pulverized coal particle in combustion process using the CCSEM data of different carbon conversion and coal types gotten by DTF experiment in authors’ previous study and evaluated properties of ash particles through the simulation.

DOI： 10.20550/jietaikaiyoushi.26.0_256

CiNii Research

P-7-10 Oxidation and Capture Mechanism of Mercury by the De-NOx Catalyst

SAKAIDA Masaya, YOSHIIE Ryo, UEKI Yasuaki, NARUSE Ichoro

Proceedings of the Annual Conference of The Japan Institute of Energy Vol. 26 ( 0 ) page： 336 - 337 2017

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Institute of Energy

The Minamata Convention on Mercury was adopted in 2013, and regulations on mercury emissions are becoming stricter all over the world. Coal combustion is one of the major mercury emission sources. The majority of mercury emissions from coal combustion is an elemental mercury. This is because oxidized mercury is water-soluble, but on the other hand elemental mercury is water-insoluble. In this study, we expected the De-NOx catalyst to have a mercury oxidation/capture performance and conducted mercury oxidation/capture experiment using the De-NOx catalyst as a sorbent. In the result, when HCl is present in the atmosphere, the De-NOx catalyst oxidized mercury and when HCl is not present in the atmosphere, the De-NOx catalyst showed high mercury capture performance. Furthermore, De-NOx catalyst maintained high mercury capture performance at a high temperature (743 K)

DOI： 10.20550/jietaikaiyoushi.26.0_336

CiNii Research

P-5-4 Behavior of pyrolysis and steam gasification of various plastics

MATSUNAGA Shimpei, YOSHIIE Ryo, UEKI Yasuaki, NARUSE Ichoro

Proceedings of the Annual Conference of The Japan Institute of Energy Vol. 26 ( 0 ) page： 308 - 309 2017

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Institute of Energy

Among various recovery processes from waste plastics, the gasification with steam addition is one of the promising technologies to reduce unwanted tar and increase the conversion to syngas. In this study, batch furnace experiments of pyrolysis and steam gasification were conducted on three kinds of plastics. Gas, tar and soot and generation behaviors were examined in them. Granular samples of ABS (acrylonitrile butadiene styrene), PC (polycarbonate) and PE (polyethylene) were used as simulated waste plastics. All experiments were duplicated using different sampling trains for gas collections and tar collections. Nitrogen gas was fed into the furnace to achieve an inert atmosphere, and the temperature was raised to 973 K, 1073 K and 1173 K, respectively. 1.2 g of the sample was inserted into the furnace. In the steam gasification experiment, water vapor was entrained by the nitrogen.

DOI： 10.20550/jietaikaiyoushi.26.0_308

CiNii Research

P-1-4 Concentrations of trace elements in particles with their diameter during coal gasification process

ATSUMI Shota, UEKI Yasuaki, YOSHIIE Ryo, NARUSE Ichiro

Proceedings of the Annual Conference of The Japan Institute of Energy Vol. 26 ( 0 ) page： 260 - 261 2017

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Institute of Energy

In this study, we conducted coal gasification experiments by electrical drop tube furnace. In the experiments, we used Low Pressure Impactor (LPI) for the particle sampling in different particle size. Captured particles are dissolved in the acid on each particle size and the trace element concentrations of the solutions in the particles are analyzed by ICP-AES. For the consideration of the result of the experiments, we conducted thermodynamic equilibrium calculations. Calculation results support to investigate the chemical compounds of trace elements in the gasification atmosphere.

DOI： 10.20550/jietaikaiyoushi.26.0_260

CiNii Research

P-1-3 SOx Emission from Oxy-fuel Coal Combustion in a Fluidized Bed

ASAI Ryosuke, YOSHIIE Ryo, UEKI Yasuaki, NARUSE Ichiro

Proceedings of the Annual Conference of The Japan Institute of Energy Vol. 26 ( 0 ) page： 258 - 259 2017

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Institute of Energy

Oxy-fuel coal combustion has drawn attention in the world as useful technique to achieve carbon dioxide capture and storage (CCS). It is a technology to enrich CO2 in exhaust gas by the flue gas recirculation with additional pure O2 to combustion atmosphere, which makes easy to capture CO2 downstream. Meanwhile, bubbling fluidized bed coal combustion has advantages of direct de-sulfurization in bed material and reduction of thermal NOX in low combustion temperature. However, there are few studies of oxy-coal fluidized bed combustion including emission behaviors of SOx and NOx. In particular, SO3 is of special concern, because the elevated SO2 and H2O concentrations in boiler by the flue gas recirculation may promote the formation of SO3. Objectives of this study are to understand SOx emission behaviors during the oxy-coal fluidized bed combustion under the actual flue gas recirculation condition, compared with those under the air and CO2-O2 combustion conditions.

DOI： 10.20550/jietaikaiyoushi.26.0_258

CiNii Research

Research on Elucidation of Reaction, Pollutants and Ash Behaviors during Solid Fuel Combustion and Gasification

NARUSE Ichiro

Nihon Enerugii Gakkai Kikanshi Enermix Vol. 96 ( 3 ) page： 236 - 241 2017

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Institute of Energy

Both resources and environmental controls have globally become obvious. Although alternative energy resources should be utilized more and more, it is also necessary to enhance efficient and ecological use of fossil fuels, which have undertaken basis of global energy society. As coal is one of the even-distributed and reasonable fossil fuels worldwide, huge amount of coal has been consumed in economically developed countries, such rising countries as China and India and economically developing countries. As a result, not only tightness of the coal supply, but also increase of load of the global environment have worried in the near future. From the present viewpoint and the future trend, coal must utilize efficiently and ecologically, and another solid fuels, including biomass and solid wastes, must also be recognized as one of the alternative ones. Additionally, development of both the global, ecological and efficient utilization technologies for those solid fuels and the core and component technologies to support them as well as the academic studies to elucidate the mechanisms in the phenomena occurring have been much more important in the near future to sustain the basis of global energy society.

DOI： 10.20550/jieenermix.96.3_236

CiNii Research

Oxidation and capture characteristics of mercury in coal combustion exhaust gas

Sakaida Masaya, Ueki Yasuaki, Yoshiie Ryo, Naruse Ichiro

Proceedings of the Annual Conference of Japan Society of Material Cycles and Waste Management Vol. 28 ( 0 ) page： 323 2017

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