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Torrefaction of Spent Coffee Ground to Change the Fuel Properties
( Rabin Nepal ),( Hyeok Jin Kim ),( Chan Park ),( Min Jeong Song ),( Sea Cheon Oh ) 한국폐기물자원순환학회(구 한국폐기물학회) 2021 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2021 No.-
Fuel crisis and global warming are currently the two major global issues that humans are tackling in these years. The concept, study and development of the renewable sources of energy, where the convertsion of biomass waste to energy has attracted increasing worldwide interest. Here, the treatment of the biomass has multiple advantages from improving the fuel characteristics to waste management and so on. There are several biochemical, thermochemical, thermal, hydrothermal and chemical process of biomass conversion. Thus, this study used torrefaction to improve the fuel characteristics of spent coffee ground (SCG). Spent coffee grounds are the waste (residue) generated during the brewing process of coffee. Torrefaction as one of the most promising thermochemical process plays a vital role in biomass conversion. Torrefaction of SCG was investigated in a horizontal tubular reactor at a temperature ranging from 250 to 350℃, for torrefaction residence time varying from 0 to 30 mins. The torrefied products were investigated using gas analysis, mass and energy yields, calorific values, elemental analysis, proximate analysis, thermogravimetric analysis, derivative thermogravimetry, and fourier transform infrared spectroscopy analysis.
Study of the Fuel Characteristics of Torrefied Spent Coffee Ground
Rabin Nepal,Hyeok Jin Kim(김혁진),Chan Park(박찬),Min Jeong Song(송민정),Sea Cheon Oh(오세천) 한국신재생에너지학회 2021 한국신재생에너지학회 학술대회논문집 Vol.2021 No.7
Energy deficiency and global warming has become a serious issue in the world. Excessive dependency on fossil fuel is one of the major reasons for this so the alternative sources of energy need to be promoted and developed. Biomass to energy could be a better option where the conversion of the waste biomass to fuel could be a prominent solution for energy and environmental point of view. Thus, this study used torrefaction to improve the fuel characteristics of spent coffee ground (SCG). Spent coffee grounds are the waste (residue) generated during the brewing process of coffee. Torrefaction is an emerging thermal biomass pretreatment method that helps in increasing the fuel characteristics of biomass. The torrefaction of SCG was investigated in a horizontal tubular reactor at a temperature of 250, 270, 290, 310, 330 & 350℃, for the residence time of 0, 10, 20 & 30 mins. The torrefied products were characterized and analyzed in terms of their energy yield, mass yield, calorific value, elemental composition, cell structure, etc. The gaseous products from the torrefaction of SCG were also analyzed. Furthermore, the study reveals that the carbon content increases &oxygen content with an increasing torrefaction temperature which helps in increasing the fuel characteristics of SCG.
Torrefaction of Spent Coffee Ground to Enhance Fuel Characteristics
( Rabin Nepal ),( Chan Park ),( Sea Cheon Oh ) 한국폐기물자원순환학회 2022 ISSE 초록집 Vol.2022 No.-
Worldwide, massive amounts of solid waste are produced, yet none of it is handled in an environmentally friendly manner. The management of solid waste is significantly impacted by the energy production from waste biomasses. Converting waste biomass into energy has a significance impact in solid waste management. One of the bio-wastes generated by the coffee industry during the brewing process is spent coffee grounds (SCG). This study, aims to improve the fuel properties of SCG via torrefaction and investigates the characteristics of torrefied products. Torrefaction is the thermal treatment process performed typically between 200°C to 320°C with an aim in increasing the fuel properties of biomass by removing the moisture and other volatile contents. The torrefaction of SCG was investigated in a three zone horizontal tubular reactor at a temperature ranging from 250 ℃ to 350℃, for torrefaction residence time varying from 0 to 30 mins. The associated physical and chemical transformations in SCG torrefaction were investigated using mass yield, energy yield, and calorific value analysis, proximate and ultimate analysis, gas composition, thermogravimetric and derivative analyses along with Fourier Transform Infrared Spectroscopy (FTIR). Torrefaction has been found to facilitate the depolymerization and breakdown of oxygen-containing volatile organic compounds, increasing the calorific value and carbon content of SCG and improving fuel quality. A torrefaction temperature of 290 ℃ and a residence time of 10 min was found to be the optimal conditions for SCG torrefaction.