Study of the Effects of the Addition of Coffee Grounds and Sugarcane Fibers on Thermal and Mechanical Properties of Briquettes

ABSTRACT

Studies of the addition of coffee grounds and sugarcane fibers into briquettes were investigated. The use of different biomass aimed at obtaining efficient briquettes with better biofuels characteristics and results. In this work, mechanical and thermal characterizations were studied. The higher percentage of sugarcane fibers in the briquettes promoted an increase of elastic modulus and mechanical resistance. Thermal conversion occurred in temperature range of 200-530°C presenting a devolatilization process, related cellulose and lignin. The results of moisture and ash content of the briquettes presented near values. The good results for higher heating value (HHV) from 20.32 MJ.kg⁻¹ to 21.92 MJ.kg⁻¹ can be related to the biomass compositions used. Therefore, these agroindustrial wastes presented a good potential for briquetting and reuse as a biofuel source.

摘要

研究了在型煤中添加咖啡渣和甘蔗纤维的情况.利用不同生物质制备出具有较好生物燃料特性和效果的高效型煤.在这项工作中，研究了机械和热特性。甘蔗纤维在型煤中的比例越高，其弹性模量和机械阻力越大.热转化发生在200-530℃的温度范围内，表现为脱挥过程、相关的纤维素和木质素。结果表明，型煤的水分和灰分含量接近.从20.32mJ.kg-1到21.92mJ.kg-1的高热值（hhv）的良好结果可能与所使用的生物量成分有关.因此，这些农业废弃物具有很好的成型和作为生物燃料来源的再利用潜.

KEYWORDS:

• Sugarcane fibers
• coffee grounds
• agroindustrial waste
• briquettes
• thermal properties
• biofuel

关键词:

• 甘蔗纤维
• 咖啡渣
• 农业工业废物
• 煤块
• 热性能
• 生物燃料

Acknowledgments

The authors acknowledge the financial support provided by Brazilian Research Agencies: FAPESP (06/60885-2) and CAPES.

Additional information

Funding

This work was supported by the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) [06/60885-2]; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) [Finance Code 001], Brazil.