Tag Archives: briquetting

186–193 V. Liška
The energy intensity of the briquetting process in terms of profitability of waste treatment
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The energy intensity of the briquetting process in terms of profitability of waste treatment

V. Liška

Czech University of Life Sciences Prague, Faculty of Engineering, Department of Material Science and Manufacturing Technology, Kamýcká 129, CZ165 00 Prague 6 – Suchdol, Czech Republic
E-mail: vliska@tf.czu.cz

Abstract:

Modern agricultural industry is a source of a considerable amount of waste, which can come in various forms and states. Such waste, and not just agricultural waste in the form biomass, is highly desirable for further processing, depositing or utilising its energy potential. Briquetting technology is suitable for all these purposes. The briquetting press for industrial use is complex technical equipment. The economy of its operation has a major impact on the profitability of the produced briquettes and hence on the efficiency of waste and biomass processing as such. The paper deals with the energy demands of briquetting in terms of waste treatment and economic profitability of production in the whole context of waste processing as a whole.

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365-376 V. Chiteculo, A. Brunerová, P. Surový and M. Brožek
Management of Brazilian hardwood species (Jatoba and Garapa) wood waste biomass utilization for energy production purposes
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Management of Brazilian hardwood species (Jatoba and Garapa) wood waste biomass utilization for energy production purposes

V. Chiteculo¹*, A. Brunerová²*, P. Surový¹ and M. Brožek²

¹Czech University of Life Sciences Prague, Faculty of Forestry and Wood Sciences, Department of Forest management, Kamýcká 129, CZ165 00 Prague, Czech Republic
²Czech University of Life Sciences Prague, Faculty of Engineering, Department of Material Science and Manufacturing Technology, Kamýcká 129, CZ165 00 Prague, Czech Republic
*Correspondence: brunerova@tf.czu.cz; chiteculo@fld.czu.cz

Abstract:

In the Federative Republic of Brazil, Jatoba (Hymenaea courbaril) and Garapa (Apuleia leiocarpa) trees are intensively harvested. The yield of one log is approximately 45–55%, which indicates a great amount of produced wood waste biomass.Present research monitored the suitability of wood waste biomass from Jatoba and Garapa trees for bio–briquette for solid biofuel production. The research was focused on chemical parameters,and energy potential of such biomass kinds. Jatoba wood waste biomass was used for the production of bio–briquette fuel and its final mechanical quality was investigated by determination of their mechanical quality indicators. Results of chemical analysis (in wet basis) exhibited great level of ash content in case of both species (Jatoba – 0.31%, Garapa – 3.02%), as well as high level of energy potential; net calorific value equal to 18.92 MJ kg–1 for Jatoba and to 18.395 MJ kg–1 for Garapa. Analysis of elementary composition proved following levels of oxygen content: Jatoba – 41.10%, Garapa – 39.97%. Mechanical analysis proved bio–briquette samples volume density ρ equal to 896.34 kg m–3 which indicated quality bio–briquette fuel, while the level of rupture force RF occurred at a lower level – 47.05 N mm–1. Most important quality indicator, the mechanical durability DU, unfortunately, occurred at a lower level; DU = 77.6% compared to the minimal level of bio–briquette fuels intended for commercial sales which must be > 90%. Overall analysis proved materials suitability for energy generation purpose with certain limitations which can improve by changing production parameters of briquetting.

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61-66 A. Kronbergs, E. Kronbergs and E. Repsa
Evaluation of reed canary grass shredding and compacting properties
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Evaluation of reed canary grass shredding and compacting properties

A. Kronbergs*, E. Kronbergs and E. Repsa

Latvia University of Agriculture, Faculty of Engineering, Institute of
Mechanics, J. Cakstes bulv. 5, LV-3001 Jelgava, Latvia;
*Correspondence: andris.kronbergs@llu.lv

Abstract:

Reed canary grass biomass is recommended for solid biofuel production. The main conditioning operation before preparation of herbaceous biomass compositions for solid biofuel production is shredding. Shredding can increase bulk density up to 165 kg m-3. Biomass compacting represents technology for the conversion of biomass into a solid biomass fuel in the shape of briquettes and pellets. Compacting of biomass is one of the important processes for effective handling, transport and storage of this biomass fuel material. The purpose of the work was to investigate reed canary grass (Phalaris arundinacea) comminuting energy, bulk density and briquetting energy dependence on hammer mill screen opening sizes. For comminuting was used a hammer mill, equipped with four different screens with opening sizes 20, 12, 6 and 1.5 mm. Comminuting energy for these opening sizes was stated within 11–236 kJ kg-1 . Bulk density for reed canary grass by comminuting can be increased up to 165 kg m-3 if hammer mill screen with opening size 1.5 mm is used. For briquetting experiments were used a hydraulic laboratory press, where for compacting were used five different pressure levels – 90, 120, 150, 180 and 210 MPa. Maximum density 899–964 kg m-3 had been achieved for compacting pressure 210 MPa. Summary energy consumption for comminuting and briquetting is approximately 50 kJ kg-1 if screen opening sizes are 12 and 20 mm in comminuting. For these sizes briquette density is 899 and 915 kg m-3 .

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149-155 A. Menind, L. Oper, M. Hovi, J. Kers, M. Tutt and T. Kikas
Pretreatment and usage of pulp and paper industry residues for fuels production and their energetic potential
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Pretreatment and usage of pulp and paper industry residues for fuels production and their energetic potential

A. Menind¹, L. Oper², M. Hovi¹, J. Kers³, M. Tutt¹ and T. Kikas¹

¹Institute of Technology, Estonian University of Life Sciences, Kreutzwaldi 56,
EE51014 Tartu, Estonia; e-mail: andres.menind@emu.ee
²Institute of Economics and Social Sciences, Estonian University of Life Sciences,
Kreutzwaldi 1, EE51014 Tartu, Estonia; e-mail: liis.oper@emu.ee
³Department of Polymer Materials, Tallinn University of Technology;
e-mail: jaan.kers@ttu.ee

Abstract:

This paper gives an overview about Pulp and Paper Industry (PPI) residues, their properties and some solutions for converting those materials into fuels. The main leftovers are bark, sludge of aerobic digestion, primary floto sediment (PFS) and pulp rejects (PR). PFS and PR after applying dewatering (press fluids) have considerable biogas potential. Bark and press cake of PR are a good resource for briquetting. Ethanol potentials of bark and PR cake are presented.

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