Basic Study on Hydrogen-Rich Gas Production by High Temperature Steam Gasification of Solid Wastes

Umeki, Kentaro; Son, Young-il; Namioka, Tomoaki; Yoshikawa, Kunio

doi:10.1299/jee.4.211

Cited by 24 publications

(17 citation statements)

References 11 publications

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“…This particular technology appears to be a good candidate for hydrogen production. However, the co-current gasification configuration is not the most adaptive, and higher gas yield or thermal efficiency can be achieved using a counter-current or updraft configuration as proposed and experimented in [7,11,17].…”

Section: High Temperature Steam Gasificationmentioning

confidence: 99%

“…Using Steam based technologies, a syngas with high heating value (LHV) and H 2 rich was obtained using various types of reactors [6][7][8]. For steam only technologies, there are several additional advantages: (1) No combustion derived pollutants; (2) No dilution caused by presence of N 2 in the end gas; (3) No oxygen plant is required respects to an air/oxygen blown gasifier.…”

Section: Introductionmentioning

confidence: 99%

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Assessing biomass steam gasification technologies using a multi-purpose model

Sepe

Li²,

Paul

2016

Energy Conversion and Management

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Two advanced steam-gasification technologies of biomass, high temperature steam gasification (HTSG) and solar-assisted steam gasification, have been thermodynamically investigated in this work and compared with both conventional auto-thermal gasification and High Temperature Air and Steam Gasification (HTAG). A multi-phase, multi-physics 1D steady-state model has been built up to predict the biomass gasification performance, efficiency, yield and species of produced syngas at varying gasification methods and input parameters. In particular, heterogeneous and homogenous gasification reactions coupled with a radiative transfer were employed in the solar-assisted steam gasification. The results showed that the solar-assisted steam gasification technology demonstrates its potential to produce high quality syngas (nearly 42% H 2 and 35% CO). Moreover, it upgrades the heating value of the product syngas up to 1.4 times more than the original value, due to the additional solar energy induction. Compared with conventional auto-thermal gasification, it was found that the process efficiency can be improved from 65% to 81% if using the HTAG technology and the content of hydrogen in the syngas increased from 30% to 55% if applying HTSG. The modelling results agree considerably with the reported experimental and modelling data in literature, and also able to return a direct comparison of advantage and disadvantage of each gasification method, in terms of syngas quantity and quality.

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Section: High Temperature Steam Gasificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessing biomass steam gasification technologies using a multi-purpose model

Sepe

Li²,

Paul

2016

Energy Conversion and Management

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“…In addition, the hybrid process offers synergic benefits of both the processes facilitating efficient gasification reactions, better conversion efficiency into gas, reducing tar generation and offering more H 2 yield. Numerous studies are available on individual slow pyrolysis and steam gasification [20][21][22][23]. In fact, investigations of steam gasification of pyrolyzed char are also numerous [24,25].…”

Section: June 2015mentioning

confidence: 99%

Effect of combined slow pyrolysis and steam gasification of sugarcane bagasse on hydrogen generation

Parthasarathy

Narayanan

2015

Korean J. Chem. Eng.

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“…Biomass can be converted into useful forms of energy by using pyrolysis and gasification. Recently, various types of gasification systems have been developed (1,2) , and low temperature gasification is also an interesting process from the viewpoint of energy because it demands low heat input (3) . Pyrolysis plays an important role in gasification because it is the first step to occur in a gasification process.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, some papers show the typical aspect ratio of biomass particle in the plant (1,2) . According to the reference (1) , biomass particles pass through a 1/4 in. (6.34 mm) mesh in many demonstration plants.…”

mentioning

confidence: 99%

Effect of Biomass Size and Aspect Ratio on Intra-Particle Tar Decomposition during Wood Cylinder Pyrolysis

Okekunle

Watanabe

Pattanotai

et al. 2012

JTST

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The effect of biomass size and aspect ratio on intra-particle tar decomposition has been investigated both numerically and experimentally to achieve a high rate of intra-particle tar decomposition. In one experiment, wood cylinders with a diameter of 8 mm and lengths of 2, 5, and 9 mm were pyrolyzed in an infrared reactor in an argon environment. The final reactor temperature was 973 K and the heating rate was 30 K/s. To make a calculation, a two-dimensional, unsteady state, single particle model was used, and the same convective and radiative heat fluxes were given to the top and side surface of all wood cylinders. Both calculation and experiment showed that tar yield when the length of the biomass was increased and the diameter was kept constant. The calculation showed that, first, tar was formed in the wood cylinder, and then it moved outwards during decomposition. To find an effective aspect ratio of the wood cylinder for further tar decomposition, calculations were also performed in which the aspect ratio (D/L) varied from 0.4 to 6.9 and the wood volume was fixed. As a result, a low aspect ratio was suited for intra-particle tar decomposition because of the difference in the thermal conductivity along the grain and radial directions, although there is an optimum aspect ratio because of the change of residence time. It is well known that the thermal conductivity of unpyrolyzed wood in the radial direction is much lower than that along the grain. By decreasing the aspect ratio, the ratio of the side surface area to total surface area increases. This means that more heat entered from side surface, and low thermal conductivity in the radial direction caused a temperature gradient in the cylinder. When the intra-particle temperature gradient was large, primary tar, which has been formed in the biomass with a relatively low temperature, passed through the side surface layer at high temperatures, enough to advance intra-particle tar decomposition before the tar was released. This resulted in the enhancement of intra-particle tar decomposition.

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Basic Study on Hydrogen-Rich Gas Production by High Temperature Steam Gasification of Solid Wastes

Cited by 24 publications

References 11 publications

Assessing biomass steam gasification technologies using a multi-purpose model

Assessing biomass steam gasification technologies using a multi-purpose model

Effect of combined slow pyrolysis and steam gasification of sugarcane bagasse on hydrogen generation

Effect of Biomass Size and Aspect Ratio on Intra-Particle Tar Decomposition during Wood Cylinder Pyrolysis

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