Chemistry of Gasification of Rice Hulls

Kaupp, Albrecht

doi:10.1007/978-3-322-96308-6_5

Cited by 7 publications

(3 citation statements)

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“…In theory, anything solid and carbonaceous can be gasified, and therefore converted to energy at point of use. Yet, the technology is not currently at this stage, as the following extract relates [ 18 , p. 15]: One hundred years of gasification research and commercial applications have clearly shown that the key to successful gasification is a gasifier specially designed for a particular fuel. It is of paramount importance that the physical and chemical characteristics of the fuel do not change significantly.…”

Section: Introductionmentioning

confidence: 99%

Experiments on torrefied wood pellet: study by gasification and characterization for waste biomass to energy applications

Rollinson¹,

Williams²

2016

R. Soc. open sci.

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Samples of torrefied wood pellet produced by low-temperature microwave pyrolysis were tested through a series of experiments relevant to present and near future waste to energy conversion technologies. Operational performance was assessed using a modern small-scale downdraft gasifier. Owing to the pellet's shape and surface hardness, excellent flow characteristics were observed. The torrefied pellet had a high energy density, and although a beneficial property, this highlighted the present inflexibility of downdraft gasifiers in respect of feedstock tolerance due to the inability to contain very high temperatures inside the reactor during operation. Analyses indicated that the torrefaction process had not significantly altered inherent kinetic properties to a great extent; however, both activation energy and pre-exponential factor were slightly higher than virgin biomass from which the pellet was derived. Thermogravimetric analysis-derived reaction kinetics (CO2 gasification), bomb calorimetry, proximate and ultimate analyses, and the Bond Work Index grindability test provided a more comprehensive characterization of the torrefied pellet's suitability as a fuel for gasification and also other combustion applications. It exhibited significant improvements in grindability energy demand and particle size control compared to other non-treated and thermally treated biomass pellets, along with a high calorific value, and excellent resistance to water.

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Section: Introductionmentioning

confidence: 99%

Experiments on torrefied wood pellet: study by gasification and characterization for waste biomass to energy applications

Rollinson¹,

Williams²

2016

R. Soc. open sci.

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“…G . Man saray an d A. E. G h aly 900pote ntial ability to achie ve re asonably high conve rsion e fficie ncie s without adding s to the CO , NO , and SO burde n of the atmosphe re B e agle , 1978 ;Kaupp, 1984; B oate ng e t al., 1992 ; W illiam s & Larson, 1993 ;Bridgwate r, 1995 . O ne biom ass m ate rial that shows promise in both de ve loping and de ve lope d countrie s is rice s .husk.…”

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confidence: 98%

Determination of Reaction Kinetics of Rice Husks in Air Using Thermogravimetric Analysis

Mansaray¹

1999

Energy Sources

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“…In addition to the different types of gasifier, variables such as feedstock moisture and power output also have a major influence on internal temperature and thence gas, char and tar composition [35,36]. The downdraft gasifier design, originating in the 1920s, has been most widely used for small-scale off-grid power applications [8,37], and this type of gasifier has stratified temperature zones (feedstock drying, then pyrolysis, followed by high-temperature combustion and reduction) through which the evolved pyrolysis gases pass.…”

Section: Introductionmentioning

confidence: 99%

Gasification reactor engineering approach to understanding the formation of biochar properties

Rollinson¹

2016

Proc. R. Soc. A.

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The correlation between thermochemical provenance and biochar functionality is poorly understood. To this end, operational reactor temperatures (spanning the reduction zone), pressure and product gas composition measurements were obtained from a downdraft gasifier and compared against elemental composition, surface morphology and polyaromatic hydrocarbon content (PAH) of the char produced. Pine feedstock moisture with values of 7% and 17% was the experimental variable. Moderately high steady-state temperatures were observed inside the reactor, with a ca 50°C difference in how the gasifier operated between the two feedstock types. Both chars exhibited surface properties comparable to activated carbon, but the relatively small differences in temperature caused significant variations in biochar surface area and morphology: micropore area 584 against 360 m2 g−1, and micropore volume 0.287 against 0.172 cm3 g−1. Differences in char extractable PAH content were also observed, with higher concentrations (187 µg g−1 ± 18 compared with 89 ± 19 µg g−1 Σ16EPA PAH) when the gasifier was operated with higher moisture content feedstock. It is recommended that greater detail on operational conditions during biochar production should be incorporated to future biochar characterization research as a consequence of these results.

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Chemistry of Gasification of Rice Hulls

Cited by 7 publications

References 0 publications

Experiments on torrefied wood pellet: study by gasification and characterization for waste biomass to energy applications

Experiments on torrefied wood pellet: study by gasification and characterization for waste biomass to energy applications

Determination of Reaction Kinetics of Rice Husks in Air Using Thermogravimetric Analysis

Gasification reactor engineering approach to understanding the formation of biochar properties

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