Gunma Industry Support Organization

Maebashi-shi, Japan

Gunma Industry Support Organization

Maebashi-shi, Japan
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Li L.,Gunma Industry Support Organization | Li L.,Gunma University | Morishita K.,Gunma University | Mogi H.,Gunma University | And 2 more authors.
Fuel Processing Technology | Year: 2010

Catalytic gasification of a woody biomass, Japanese cypress, was investigated under a prepared nickel-loaded brown coal (LY-Ni) char in a two-stage fixed-bed reactor. The nickel-loaded brown coal was prepared by ion-exchange method with a nickel loading rate of 8.3 wt.%. Nickel species dispersed well in the brown coal, and the LY-Ni char via devolatilization at 600 °C showed a great porous property with a specific surface area of 382 m2 g- 1. The LY-Ni char was confirmed to be quite active for the Japanese cypress volatiles gasification at a relatively low-temperature range from 450 to 650 °C. For example, at 550 °C, 16.6 times hydrogen gas and 6.3 times total gases were yielded from the catalytic steam gasification of Japanese cypress volatiles under the LY-Ni char, compared with the case of non-catalyst. The biomass tar decomposition showed a dependence on catalyst temperatures. When the catalyst temperature was higher than 500 °C, Japanese cypress tar converted much efficiently, high gas yields and high carbon balances were obtained. © 2009 Elsevier B.V. All rights reserved.

Xiao X.,Gunma Industry Support Organization | Xiao X.,Gunma University | Le D.D.,Gunma University | Morishita K.,Gunma University | And 3 more authors.
Fuel Processing Technology | Year: 2010

In this study, the design, construction and operation of an Internally Circulating Fluidized-bed Gasifier (ICFG) are introduced in detail. ICFG design provides a multi-stage gasification process, with bed material acting as the medium for char combustion and heat exchange by its internal circulation. And it is used for the steam gasification of animal waste at low temperature in view of producing fuel gas. The effects of pressure balance, pyrolysis temperature, catalytic temperature and steam/feedstock ratio on the gasifier performance (e.g. product gas yield, gas composition, tar content) are also discussed. Hydrogen-rich and low-tar product gas can be produced from the low-calorific feedstock, in the properly designed process together with high-performance catalyst. © 2009 Elsevier B.V. All rights reserved.

Xiao X.,Gunma Industry Support Organization | Xiao X.,Gunma University | Meng X.,Gunma Industry Support Organization | Le D.D.,Gunma University | Takarada T.,Gunma University
Bioresource Technology | Year: 2011

Steam gasification of waste biomass has been studied in a two-stage fluidized bed reactor, which has the primary pyrolysis fluidized bed using silica sand as bed material and the secondary reforming fixed bed with catalyst. The main objectives are parametric investigation and performance improvement especially at low temperature of around 600°C using the wood chip and the pig manure compost as feedstock. Main operating variables studied are pyrolysis temperature, catalytic temperature, steam/biomass-C ratio, space velocity and different catalyst. Reaction temperatures and steam/C ratio have important role on the gasification process. About 60vol.% H 2 (dry and N 2 free) and about 2.0Nm 3/kg biomass (dry and ash free basis) can be obtained under good conditions. Compared to Ni/Al 2O 3, Ni/BCC (Ni-loaded brown coal char) has a better ability and a hopeful prospect for the stability with coking resistance. © 2010 Elsevier Ltd.

Le D.D.,Gunma University | Morishita K.,Gunma University | Takarada T.,Gunma University | Xiao X.,Gunma Industry Support Organization | Li L.,Gunma Industry Support Organization
Journal of Chemical Engineering of Japan | Year: 2010

The use of nickel-loaded brown coal char (Ni/BCC) as a catalyst for tar reforming has been studied under mild conditions in a laboratory-scale fluidized bed gasifier using steam as the gasifying agent and nitrogen as the product gas carriers. Characterization of the catalyst was performed in a fixed-bed reactor under various conditions such as Ni/BCC particle size in the range of 0.5 to 2 mm and pyrolysis temperature in the range of 823 to 1023 K in order to investigate the effect of both catalyst particle size and pyrolysis temperature on crystallite size of Ni/BCC. The Ni/BCC catalyst was consumed at various steam feed rate so as to determine the effect of steam feed rate on the size of the catalyst. The XRD pattern of the catalyst showed that the size of the Ni particles increases as the particle size of the catalyst decreases, pyrolysis temperature increases, and steam feed rate increases. SEM images and BET surface area were used to characterize the surface structure and surface area of the Ni/BCC catalyst, respectively. The space velocity and catalytic tar reforming temperature as a function of gas yields were investigated. The catalyst showed high and stable catalytic activity and produced a high-quality product gas with space velocities of 10000 and 4000 h -1 at 923 and 873 K, respectively. © 2010 The Society of Chemical Engineers, Japan.

Xiao X.,Gunma Industry Support Organization | Xiao X.,Gunma University | Le D.D.,Gunma University | Li L.,Gunma Industry Support Organization | And 4 more authors.
Biomass and Bioenergy | Year: 2010

Utilizing large amounts of animal waste as a source of renewable energy has the potential to reduce its disposal problems and associated pollution issues. Gasification characteristics of the manure compost make it possible for low temperature gasification. In this paper, an energy efficient approach to hydrogen-rich syngas from manure compost is represented at relatively low temperature, around 600 °C, in a continuous-feeding fluidized bed reactor. The effects of catalyst performance, reactor temperature, steam, and reaction type on gas yield, gas composition, and carbon conversion efficiency are discussed. The Ni-Al2O3 catalyst simultaneously promotes tar cracking and steam reforming. Higher temperature contributes to higher gas yield and carbon conversion. The steam introduction increases hydrogen yield, by steam reforming and water-gas shift reaction. Two-stage gasification is also tried, showing the advantage of better catalyst utilization and enhancing the catalytic reactions to some extent. © 2010 Elsevier Ltd.

Xiao X.,Gunma University | Xiao X.,North China Electrical Power University | Cao J.,Gunma University | Meng X.,Gunma Industry Support Organization | And 5 more authors.
Fuel | Year: 2013

This paper presents an experimental research concerning the catalytic gasification of waste biomass to synthesis gas using Ni-loaded brown coal char (Ni/BCC). The attention is focused on the catalytic conditions for enhancing the synthesis gas production, improving its composition and extending the catalyst lifetime. The aim is achieved by means of the characterization of Ni/BCC and the product gas analysis, through gasification experiments of a woody biomass and an animal-waste-derived biomass both in a fixed bed reactor and a fluidized bed reactor at various catalytic temperatures and steam/biomass-carbon (S/C) ratios. Effects of the pyrolysis temperature and the steam treatment on the nickel crystallite size are analyzed and used as the reference of choosing optimum gasification conditions. With brown coal char as support material, Ni/BCC is found as an excellent catalyst even at low temperature of about 650 °C and shows a good resistance ability of coke formation, compared to non-catalyst and Ni/Al2O3. More than 25 h continuous operation is also performed in a 1 kg/h Internally Circulating Fluidized-bed Gasifier (ICFG) to assess the lifetime of Ni/BCC. Smaller S/C ratio at the appropriate temperature is suggested to lower the coal char gasification, thereby reducing the degradation of the support material. © 2012 Elsevier Ltd. All rights reserved.

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