Francisco J. Gómez-de la Cruz , Fernando Cruz-Peragón , Pedro J. Casanova-Peláez , José M. Palomar-Carnicero
{"title":"A vital stage in the large-scale production of biofuels from spent coffee grounds: The drying kinetics","authors":"Francisco J. Gómez-de la Cruz , Fernando Cruz-Peragón , Pedro J. Casanova-Peláez , José M. Palomar-Carnicero","doi":"10.1016/j.fuproc.2014.10.012","DOIUrl":null,"url":null,"abstract":"<div><p>Spent coffee grounds are being consolidated as one of the most abundant bioresources in the world for use as green energy. Biodiesel, bioethanol, bio-oil and fuel pellet are biofuels derived of this waste. To get them, spent coffee grounds need to be dried due to their high moisture content. This work analyzes their drying kinetics from isothermal drying experiments in a convective dryer at different temperatures: 100, 150, 200 and 250<!--> <!-->°C, and sample thicknesses: 5, 10, 15 and 20<!--> <!-->mm. Drying curves were fitted with the main mathematical models in the drying of agricultural products where the Two Term Gaussian model got the best results of fit. Drying rate was calculated and analyzed. Effective moisture diffusivities were calculated in a range between 1.29<!--> <!-->·<!--> <!-->10<sup>−<!--> <!-->9</sup> to 28.8<!--> <!-->·<!--> <!-->10<sup>−<!--> <!-->9</sup> <!-->m<sup>2</sup>/s. Activation energies were 12.29, 12.78, 15.18 and 16.87<!--> <!-->kJ/mol for each sample thickness: 5, 10, 15, and 20<!--> <!-->mm, respectively.</p></div>","PeriodicalId":326,"journal":{"name":"Fuel Processing Technology","volume":"130 ","pages":"Pages 188-196"},"PeriodicalIF":7.7000,"publicationDate":"2015-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.fuproc.2014.10.012","citationCount":"56","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Fuel Processing Technology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0378382014004275","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, APPLIED","Score":null,"Total":0}
引用次数: 56
Abstract
Spent coffee grounds are being consolidated as one of the most abundant bioresources in the world for use as green energy. Biodiesel, bioethanol, bio-oil and fuel pellet are biofuels derived of this waste. To get them, spent coffee grounds need to be dried due to their high moisture content. This work analyzes their drying kinetics from isothermal drying experiments in a convective dryer at different temperatures: 100, 150, 200 and 250 °C, and sample thicknesses: 5, 10, 15 and 20 mm. Drying curves were fitted with the main mathematical models in the drying of agricultural products where the Two Term Gaussian model got the best results of fit. Drying rate was calculated and analyzed. Effective moisture diffusivities were calculated in a range between 1.29 · 10− 9 to 28.8 · 10− 9 m2/s. Activation energies were 12.29, 12.78, 15.18 and 16.87 kJ/mol for each sample thickness: 5, 10, 15, and 20 mm, respectively.
期刊介绍：
Fuel Processing Technology (FPT) deals with the scientific and technological aspects of converting fossil and renewable resources to clean fuels, value-added chemicals, fuel-related advanced carbon materials and by-products. In addition to the traditional non-nuclear fossil fuels, biomass and wastes, papers on the integration of renewables such as solar and wind energy and energy storage into the fuel processing processes, as well as papers on the production and conversion of non-carbon-containing fuels such as hydrogen and ammonia, are also welcome. While chemical conversion is emphasized, papers on advanced physical conversion processes are also considered for publication in FPT. Papers on the fundamental aspects of fuel structure and properties will also be considered.
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