Gravity discharge characteristics of biomass-coal blends in a hopper

Guo, Zhiguo; Chen, Xueli; Liu, Haifeng; Chen, Handing

doi:10.1016/j.fuel.2014.02.009

Cited by 23 publications

(5 citation statements)

References 39 publications

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“…Knowledge of mechanical properties of granular biomass and its blends with coal is necessary for design and efficient operation of equipment for handling, storage and processing [26,7,9,8,10,6,25]. Biomass is widely used as energy source directly or in the form of briquettes or pellets that is a granular material.…”

Section: Introductionmentioning

confidence: 99%

“…The most important technologies of process engineering involving granular biomass are pneumatic conveying, transport, size reduction, densification, mixing (blending), segregation, weighing, metering, packaging and bagging or storage. To assure reliable processing and efficiency of equipment exact values of material parameters are necessary [8,9,1]. Of particular interest in bioenergy practice are such characteristics of granular biomass such as density, strength parameters, elasticity and flowability.…”

Section: Introductionmentioning

confidence: 99%

“…Both parameters were found dependent on considered factors. Guo et al [8,9] examined changes of discharge from hopper and flowability of mixtures of coal and granular biomass i.e. rice straw and sawdust.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mechanical properties of sawdust and woodchips

Stasiak

Molenda

Bańda

et al. 2015

Fuel

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanical properties of sawdust and woodchips

Stasiak

Molenda

Bańda

et al. 2015

Fuel

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“…With specific reference to solids from particulate biomasses, handling and feeding present further difficulties due to peculiar properties both at particle level and at bulk level that make these materials even more unpredictable than other granular materials traditionally processed by industry, especially in terms of flow reliability and control [14][15][16]. As a result these materials often require a semi-empirical approach to correlate discharge and flow property data with composition [17,18]. Robust and reliable characterization methods for off-line measurements of particulate biomass flow properties are urgently needed, as well as biomass structure and composition characterization methods, suitable for on-line analysis of rapid material streams enabling fast non-destructive biomass classification procedures, e.g.…”

Section: Introductionmentioning

confidence: 99%

Assessment on bulk solids best practice techniques for flow characterization and storage/handling equipment design for biomass materials of different classes

Berry

Larsson

Lestander

et al. 2015

Fuel Processing Technology

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This paper shows the results of a collaborative project in which four different laboratories have carried out complementary characterization tests on samples of the same set of lignocellulosic biomass materials with the objectives of better understanding their properties and identifying any critical features of the different characterization procedures. Three different types of material were used as model biomasses: 1) Scots pine wood chips, as an example of a coarse and flaky particulate biomass with some elastic properties; 2) chopped straw of reed canary grass as a nesting biomass having long and flaky fibers; 3) Scots pine wood powder as a fine particulate with elastic and cohesive properties. Particle size and shape analyses were carried out with; calipers, 2D image analysis, 3D image analysis (ScanChip) and through mechanical sieving. Applications and validity limits of each of these techniques are evaluated and discussed. The flow function and internal friction 2 were determined with a Schulze ring shear tester, a Brookfield powder flow tester and a large ring shear tester. No significant differences in the results generated by these shear testing techniques were found. Wall friction measurements were carried out with a Schulze ring shear tester; a Brookfield powder flow tester; a large Jenike shear tester and a Casagrande shear box. Results, in this case, showed significant differences with a higher wall friction coefficient obtained with the larger shear cell. Additionally, tensile strengths of biomass materials were measured by the use of a novel measurement technique. Arching tests were carried out in a pilot scale plane silo with variable hopper geometry and results were compared with those predicted by applying the Jenike procedure and a modified procedure which assumed tensile strength was the controlling material property (rather than unconfined yield strength). Finally, safety of handling and storage was assessed by carrying out explosion tests on dusts from Scots pine and reed canary grass.KEYWORDS: lignocellulosic biomass, particle size, particle shape, flowability, arching, explosion RESEARCH HIGHLIGHTS: Suitable test methods were classified for three biomass classes  Different particle sizing methods give a wide range of results  Shear tests do not discriminate flowability differences between the biomass classes  Arching behavior depends more on tensile strength than on compressive strength  Scots pine and reed canary grass dusts are flammable

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“…The share of biomass used in firing and co-firing processes is constantly increasing. Hence, knowledge on the behavior of these materials during dosage processing and their reaction with construction materials is necessary [1][2][3][4][5][6][7][8]. Biomass is usually used in the granular form, which may generate problems during technological processes, including flow stops, caking during storage, disruption of dosing continuity, and self-segregation.…”

Section: Introductionmentioning

confidence: 99%

Friction and Shear Properties of Pine Biomass and Pellets

et al. 2020

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Knowledge on the mechanical properties of granular biomass is important for the design and efficient operation of equipment used for handling, storage, and processing. Their mechanical properties are used as a measure of material quality. In this study, the mechanical properties of granular biomass obtained from pines (sawdust, shavings, long shavings, and pellets) were determined under a moisture content range of 10–50%. The coefficient of sliding friction µ of four construction materials was determined using a 210-mm-diameter direct shear tester (Jenike’s shear box). To measure the shear resistance of the biomass materials (represented as torque T), a prototype vane tester was constructed. The characteristics of shear resistance with respect to time T(t) were determined for material samples under normal pressure p ranging from 5 to 30 kPa and a vane rotation rate of 3 rpm. Measurements were performed for five geometries of the rotor, reflecting typical deformation conditions encountered in the processing of granular biomass. The coefficient of sliding friction was found to be affected by the type of material, moisture content, and normal compressive pressure. Depending on the biomass material, the highest µ, which ranged from 0.50 to 0.62, was obtained for black steel, whereas the lowest µ, which ranged from 0.27 to 0.52, was obtained for aluminum. The lowest coefficient of sliding friction was observed for dry materials and high normal pressure. The torque T was observed to be affected by the rotor shape, material, normal pressure, and moisture content. The parameters presented provide information useful for the design of transport equipment and processing of granular wood biomass.

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Gravity discharge characteristics of biomass-coal blends in a hopper

Cited by 23 publications

References 39 publications

Mechanical properties of sawdust and woodchips

Mechanical properties of sawdust and woodchips

Assessment on bulk solids best practice techniques for flow characterization and storage/handling equipment design for biomass materials of different classes

Friction and Shear Properties of Pine Biomass and Pellets

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