Effect of raw material composition in woody biomass pellets on combustion characteristics

Rhén, Christofer; Öhman, Marcus; Gref, Rolf; Wästerlund, Iwan

doi:10.1016/j.biombioe.2006.06.016

Cited by 107 publications

(47 citation statements)

References 9 publications

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“…The densification of biomass into pellets results in a fuel source with high energy and bulk densities, reducing the costs of transportation, handling, and storage (Hartmann and Lenz 2012). Unfortunately, rice husk contains high levels of ash and alkali metals, which could lead to deposit formation during thermal conversion in boilers and furnaces (Mansaray and Ghaly 1997;Werther et al 2000;Garivait et al 2006;Rhen et al 2007). These issues are common with agriculture-based feedstocks used for pellet production (Jenkins 1998).…”

Section: Introductionmentioning

confidence: 99%

Fuel Pellets from a Mixture of Rice Husk and Wood Particles

Bajo

Acda

2017

BioResources

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The physical and mechanical properties were studied for fuel pellets made from a mixture of rice husk and Gmelina arborea wood particles. Pellet density, compressive strength, and abrasion resistance were used to evaluate pellet quality at various densification pressures and proportions of rice husk to wood particles. Pellet density and compressive strength increased from 850 to 1070 kg/m 3 and 0.61 to 1.2 MPa, respectively, when densification pressure increased from 80 to 120 MPa. The abrasion resistance for all pellet samples in this study was < 2.0%. Proximate analyses of the fuel pellets showed that volatile matter, fixed carbon, and heating value were relatively high and increased with a higher proportion of wood particles. Ash levels were also high (1.3 to 17.8%), which could cause problems with emission and deposition during thermal conversion. In general, except for the ash content, the physical and mechanical properties of pellets made from rice husk and G. arborea wood particles in this study were within the acceptable limits to be used as fuel pellets for industrial heat applications.

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Section: Introductionmentioning

confidence: 99%

Fuel Pellets from a Mixture of Rice Husk and Wood Particles

Bajo

Acda

2017

BioResources

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“…The effect of pellet raw materials on combustion and emission in small-scale stoves and boilers has been studied previously, but there has not been any significant emphasis on pellet length [1][2][3]. The effect of wood chip fuel particle size has been studied and modeled in fixed bed batch studies, which are better suited for simulating large grate boilers.…”

Section: Introductionmentioning

confidence: 99%

Small Scale Pilot Combustion Experiments with Wood Pellets – The Effect of Pellet Length

Sikanen¹

2012

TOREJ

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Abstract:The primary objective of this study was to observe the effect of pellet length on utility and combustion temperature. Pellets with various lengths were combusted in a pellet stove. Pellet length was found to have a significant effect on the combustion temperature and stability. Increasing the length of pellets from 5.8mm to 13.1mm decreased the average burning temperature by 31% and flue gas temperature by 25%. The major determinants of combustion efficiency derived from pellet length were assessed.

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“…The BIC briquettes can be manufactured in a wide range of sizes, also large dimensions (48 mm in diameter and 85 mm in length) and with densities higher (1300 kg/m 3 ) than ordinary wood pellets (600 kg/m 3 ) [4]. As a result the combustion time of the fuel [5][6] enables a longer heat release with a small number of fuel loadings, resulting in a better overall performance than existing biomass fuels.…”

Section: Introductionmentioning

confidence: 99%

Ignition Behavior of Bio-Coke (Highly Densified Biomass Fuel) in High-Temperature Air Flows

Ito

Sakai

Ida

et al. 2011

JTST

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The ignition behavior of a newly developed biomass briquette, Bio-coke (BIC), is investigated. The fuel has unique features such as economical advantages for its versatility of biomass resources, high volumetric calorific value because of its high density (1300 kg/m 3 ; twice or more than that of ordinary wood pellets) and high mechanical strength. The ignition characteristics of cylindrical BIC blocks (48 mm in diameter and 85 mm in length), important when using the fuel in actual combustion furnaces, are investigated in high temperature air flows (473-873 K, 550-750 NL/min.). In the experiments, preheated air is blown onto the bottom surface of BIC cylinders and the ignition behavior of the bottom surface is observed monitoring the surface temperature as well as the time dependent mass loss rates. The results show two ignition modes; (1) solid surface ignition preceding gas-phase ignition in high air temperature conditions (T≥598K), and (2) gas-phase ignition accompanied by simultaneous surface ignition occurring at relatively low air temperature conditions. The appearance of each mode depends on the preheated air supply condition in terms of the air temperature, flow velocity, and moisture content of the fuel. The rate of evolution of volatile gases is closely correlated with the temperature distribution inside the BIC briquette which depends on the heating rate, implying that variations in the temperature distribution inside the fuel could be one reason for the appearance of the observed ignition modes. It is suggested that the temperature distribution inside the fuel has to be taken into account in the control of the ignition behavior of BIC briquettes.

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Effect of raw material composition in woody biomass pellets on combustion characteristics

Cited by 107 publications

References 9 publications

Fuel Pellets from a Mixture of Rice Husk and Wood Particles

Fuel Pellets from a Mixture of Rice Husk and Wood Particles

Small Scale Pilot Combustion Experiments with Wood Pellets – The Effect of Pellet Length

Ignition Behavior of Bio-Coke (Highly Densified Biomass Fuel) in High-Temperature Air Flows

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