Optimisation of the manufacturing variables of sawdust pellets from the bark of Pinus caribaea Morelet: Particle size, moisture and pressure

Relova, I.; Vignote, S.; León, M. A.; Ambrosio, Y.

doi:10.1016/j.biombioe.2009.05.005

Cited by 32 publications

(29 citation statements)

References 3 publications

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“…The quality of the pellets, evaluated by the presence of cracks and the density profiles in this study, indicates the degree of effectiveness of the amount of compressed material and the pressure generated during the pelletizing process (Relova et al, 2009). These techniques can be used to explain the performance of the pellets, e.g., the presence of cracks and high variability affect pellet durability and fragility (Serrano et al, 2011).…”

Section: Pellet Qualitymentioning

confidence: 99%

Use of coffee (Coffea arabica) pulp for the production of briquettes and pellets for heat generation

Cubero-Abarca

Moya

Valaret³

et al. 2014

Ciênc. agrotec.

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Coffee bean (Coffea arabica) processing generates high amount of residues that are sources of environmental pollution. Therefore, an appropriate solution is needed. The objective of this study was to determine the potential of coffee pulp to produce briquettes and pellets. The study included pulp drying (using air, solar and hot air methods); the production of briquettes and pellets; the evaluation of their energy, physical and mechanical properties; and the evaluation of pellet quality using X-ray densitometry. The results showed that the pulp presented an initial moisture content of 90%, resulting in drying times of 699, 308 and 55 hours for air, solar and hot air drying, respectively, and the calorific values of the pellets and briquettes were 12,501 kJ kg -1 and 11,591 kJ kg -1 , respectively. The ash content was 8.68% for the briquettes and 6.74% for the pellets. The density of the briquettes was 1,110 kg m -3, compared with 1,300 kg m -3 for the pellets. The apparent densities were 1,000 kg m -3 and 600 kg m -3 for the briquettes and pellets, respectively, and the water absorptions by the briquettes were 7.90% and 8.10% by the pellets. The maximum horizontal compression effort was 26.86 kg cm -2 , measured in the pellets, compared with 4.52 kg cm -2 in the briquettes. The maximum horizontal load was 93.24 kg, measured in the briquettes, compared with 33.50 kg in the pellets. The value of the pellet durability test was 75.54%. X-ray densitometry showed that the pellet was uniform and a few cracks were observed on the pellet surface.Index terms: Coffee residues, drying, coffee processing, biomass, bio-resources. RESUMONo processamento dos grãos de café (Coffea arabica) ocorre o problema de geração de grandes quantidades de resíduos não utilizados pela indústria, tornando-se uma fonte de poluição ambiental. Portanto, é necessária a busca de soluções para atender a este problema de geração de resíduos. O objetivo do trabalho foi determinar a possibilidade de utilização da polpa dos grãos de café processados para a fabricação de briquetes e pellets. A pesquisa compreendeu a secagem da polpa dos grãos de café (pelo meio do ar, solar e ar aquecido); a manufatura de briquetes e de pellets; a avaliação das suas propriedades como fonte de energia e propriedades físicas e mecânicas e a determinação da sua qualidade pela metodologia de densitometria de raios X. Os resultados mostraram que a umidade inicial da polpa de café foi de 90% e o tempo de secagem foi de 699, 308 e 55 horas no ar, secagem solar e por ar quente, respectivamente. O poder calórico foi de 12 501 kJ kg -1 e de 11 591 kJ kg -1 de pellets e de briquetes, respectivamente; o teor de cinzas foi de 8,68% e de 6,74% para os briquetes e os pellets, respectivamente. Em relação às propriedades físicas, a densidade dos briquetes foi de 1.110 kg m -3 e dos pellets de 1.300 kg m -3 a densidade aparente dos briquetes foi 1.000 kg m -3 e de 600 kg m -3 dos pellets e a absorção de água de 7,90% dos briquetes e 8,10% e dos pellets. Finalmente, o esforço de c...

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Section: Pellet Qualitymentioning

confidence: 99%

Use of coffee (Coffea arabica) pulp for the production of briquettes and pellets for heat generation

Cubero-Abarca

Moya

Valaret³

et al. 2014

Ciênc. agrotec.

View full text Add to dashboard Cite

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“…By contrast, the lowest value of σn (0.31 MPa) was obtained for the 20% humidity raw material product, compacted at 45 MPa. Compared to the tests carried out on other plant raw materials (Mani et al, 2006;Relova et al, 2009;Skonecki and Kulig, 2011), the performed pea straw agglomeration tests confirmed the tendencies of the agglomerate to change its density and mechanical strength, depending on the pressure applied, and moisture content. The test results presented in Fig.…”

Section: The Relationship Between the Degree Of Agglomerate Densitymentioning

confidence: 55%

“…Many studies demonstrate that in the production process of molded solid biofuels, the value of the applied compaction pressure (i.e. unit piston pressure) (Li and Liu, 2000;Mani et al, 2006) and the moisture content of the raw material (Relova et al, 2009;Kulig and Skonecki, 2011) is of great importance. The value of these parameters impacts both the course of the process and the quality of the finished product (Whittaker and Shield, 2017).…”

Section: Introductionmentioning

confidence: 99%

Impact of Pressure on the Parameters of Pea Straw Compaction

Kulig

Łysiak

Krzysiak

et al. 2019

Agricultural Engineering

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This paper presents the results of pea straw compaction efficiency tests. The compliance of the tested material to pressure agglomeration was assessed depending on the compaction pressure used (45-113 MPa). The compaction was carried out using a Zwick testing machine, type Z020/TN2S, and a closed die pressing unit. It was found that, along with the pressure increase, the material density in the chamber increased (from 1.255 to 1.76 g•cm -3 ), as well as the agglomerate's density (from 0.739 to 1.05 g•cm -3 ) and the product's mechanical resistance (from 0.31 to 0.69 MPa). Increasing the compaction pressure in the analyzed range increased the unit value of compaction work, from 17.16 to 34.27 J·g -1 .

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“…Relova et al [7] have revealed that the pelletizing pressure is the most important factor affecting the pellets' drop resistance by using statistical data from 32 kinds of pine sawdust pelletization. Moisture ratio is less effective than the pelletizing pressure and the particle size is less effective than the moisture ratio on determining the pellets' drop resistance.…”

Section: Introductionmentioning

confidence: 99%

Use of Disc Springs in a Pellet Fuel Machine for Pressure Regulation and Prevention of Damage

Çelik

Gunes

2017

Acta Polytech

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Abstract. The use of biomass fuel pellets is becoming widespread as a renewable and environmentfriendly energy. Pellet fuels are produced in various pellet machine types. Pellet machines encounter problems such as pressure irregularities and choke at the initial start for different kinds of biomass feedstock. In this study, disc springs are integrated into a vertical axis pellet machine for a pressure regulation and design optimization. Force-deformation and stress-deformation relations of disc springs are investigated using analytical and finite element methods. Pelletizing pressures were calculated based on disc spring force values using the Hertzian stress formula. Utilized disc springs ensured the pressure regulation, production efficiency increase and damage prevention on the die-roller mechanism.

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Optimisation of the manufacturing variables of sawdust pellets from the bark of Pinus caribaea Morelet: Particle size, moisture and pressure

Cited by 32 publications

References 3 publications

Use of coffee (Coffea arabica) pulp for the production of briquettes and pellets for heat generation

Use of coffee (Coffea arabica) pulp for the production of briquettes and pellets for heat generation

Impact of Pressure on the Parameters of Pea Straw Compaction

Use of Disc Springs in a Pellet Fuel Machine for Pressure Regulation and Prevention of Damage

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