Spent coffee grounds compaction process: Its effects on the strength properties of biofuel pellets

Lisowski, A.; Olendzki, Dariusz; Świętochowski, Adam; Dąbrowska, Magdalena; Mieszkalski, L.; Ostrowska–Ligęza, Ewa; Stasiak, Mateusz; Klonowski, J.; Piątek, Michał

doi:10.1016/j.renene.2019.04.114

Cited by 40 publications

(25 citation statements)

References 43 publications

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“…This will require the design of a new type of laboratory-scale attachment, which should enable analysis on the influence of both the entry angle and channel length on pellet quality. A similar device is presented in the literature [63].…”

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confidence: 97%

Parameters Affecting RDF-Based Pellet Quality

et al. 2020

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Increasing production of waste has compelled the development of modern technologies for waste management. Certain fractions of municipal solid wastes are not suitable for recycling and must be utilised in other ways. Materials such as refuse-derived fuel (RDF) fractions are used as fuel in cement or CHP (combined heat and power) plants. The low bulk density leads to many problems pertaining to transportation and storage. In the case of biomass, these problems cause reduction in pelletisation. This paper therefore presents a comprehensive study on RDF pellet production, which is divided into three major areas. The first describes laboratory-scale tests and provides information on key factors that affect pellet quality (e.g., density and durability). Based on this, the second part presents a design of modified RDF dies to form RDF pellets, which are then tested via a semi-professional line test. The results show that RDF fraction can be compacted to form pellets using conventional devices. Given that temperature plays a key role, a special die must be used, and this ensures that the produced pellets exhibit high durability and bulk density, similar to biomass pellets.

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confidence: 97%

Parameters Affecting RDF-Based Pellet Quality

et al. 2020

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“…At ranges of 78–93 °C and 93–108 °C, the decline amounted to 1% and 60%, respectively. For lignocellulose pellets, temperature was the most important factor for σ c , followed by the compaction pressure, particles size, and MC [ 19 ]. On the other hand, the changes of E j vs. l c were proportional and had a digressive gradient.…”

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confidence: 99%

“…The strength of single pellets for compressive loads was determined by diametric compression tests, which have been widely used by researchers [ 17 , 18 , 19 ]. The pellets were cut in 20 mm pieces using a scalpel.…”

Section: Methodsmentioning

confidence: 99%

Characterisation of Wheat Straw Pellets Individually and in Combination with Cassava Starch or Calcium Carbonate under Various Compaction Conditions: Determination of Pellet Strength and Water Absorption Capacity

2020

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This study aimed to optimise the production conditions of wheat straw (WS) pellets and pellets with the additives of cassava starch (CS) or calcium carbonate (CC) based on the criteria of pellet strength and water absorption by crushed pellets. The pellets produced using a 2–10%-wt/wt additive ratio, material moisture of 10–30% w.b., die height of 66–86 mm, and material temperature of 78–108 °C were tested. The influence these factors on the strength parameters of pellets was different than on the water absorption by the crushed pellets. The pellets made of WS blended with CC additive were characterised by better strength parameters and the compressed pellets were characterised by better water absorption than those with CS. High and positive correlation among specific pellet compression work, elasticity modulus for pellet compression, and tensile strength values were observed. As the strength parameters of pellets showed high correlation with single pellet density, for the consistency of conclusions, the optimal conditions for pellet production were assumed based on the density. For optimal conditions at 4% wt/wt additive ratio, 23% w.b. material moisture, 78 mm die height, and 80 °C material temperature, the specific pellet compression work was 3.22 mJ·mm−2, elasticity modulus was 5.78 MPa, and maximum tensile strength of the pellets was 2.68 MPa; moreover, the water absorption by crushed pellets amounted to 2.60 g H2O·g−1 of dry matter.

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“…The chemical properties of coffee waste take the top position among the different types of material for wood pellet production and the short growing period for coffee beans is also an advantage of SCG compared to trees. Lisowski et al [16] confirmed that the chemical composition of the SCG is a very good quality raw material for use as a biofuel, by highlighting that moisture had a greater and nonlinear effect on the density and strength of pellets than the height of the pelleting die.…”

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confidence: 99%

Energy Utilization of Spent Coffee Grounds in the Form of Pellets

2020

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Nowadays it is important to limit the use and combustion of fossil fuels such as oil and coal. There is a need to create environmentally acceptable projects that can reduce or even stop greenhouse gas emissions. In this article, we dealt with the objectives of energy policy with regard to environmental protection, waste utilization, and conservation of natural resources. The main objective of the research was to assess the possibility of the use of spent coffee grounds (SCG) as fuel. As a part of the solution, the processing of coffee waste in the form of pellets, analysis of calorific value and combustion in the boiler were proposed. The experiments were done with four samples of pellets. These samples were made from a mixture of wood sawdust and spent coffee grounds with ratio 30:70 (wood sawdust: spent coffee grounds), 40:60, 50:50 and 100% of spent coffee grounds. The calorific values were compared with wood sawdust pellets (17.15 MJ.kg −1 ) and the best lower calorific value of 21.08 MJ.kg −1 was measured for 100% of spent coffee grounds. This sample did not achieve the desired performance during the combustion in the boiler due to the low strength of the sample.

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Spent coffee grounds compaction process: Its effects on the strength properties of biofuel pellets

Cited by 40 publications

References 43 publications

Parameters Affecting RDF-Based Pellet Quality

Parameters Affecting RDF-Based Pellet Quality

Characterisation of Wheat Straw Pellets Individually and in Combination with Cassava Starch or Calcium Carbonate under Various Compaction Conditions: Determination of Pellet Strength and Water Absorption Capacity

Energy Utilization of Spent Coffee Grounds in the Form of Pellets

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