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Physical and combustion properties of briquettes from sawdust of Azadirachta indica

Journal of Forestry Research 2010年第1期21卷 63-67,I0003页

作者： O.A.Sotannde A.O.Oluyege G.B.Abah Department of Forestry and Wildlife Faculty of AgricultureUniversity of MaiduguriP.M.B. 1069 MaiduguriBorno StateNigeri Department of Forestry and Wood Technology Federal University ofTechnologyP.M.B. 704 AkureOndo StateNigeria

The study was undertaken to investigate the properties of cassava starch and gum arabic bonded briquettes from the sawdust of Azadirachta indica. The briquettes were produced using a Jack press at an average pressure of 10.7 ***^-2. The sawdust and binders were mixed at ratios of 100：15, 100：25, 100：35 and 100：45 in weight, respec tively. The briquettes produced were subjected to physical and combustion tests. Both the physical and combustion properties of the briquettes vary with binder types and binder levels （p 〈 0.05）. The result shows that briquettes bonded with starch gave better performance based on density of 0.546 ***^-3, durability rating of 95.93%, heating value of 33.09 ***^-1, percentage of fixed carbon of 84.70% and low ash and volatile matter of 3.35% and 11.95%, respectively, while briquette bonded with gum arabic has density of 0.425 ***^-3, durability rating of 94.85%, heating value of 32.76 ***^-l, percentage of fixed carbon of 87.30% and low ash and volatile matter of 4.45% and 8.75, respectively. Since the aim of briquetting is to produce briquette that will serve as a good source of fuel and support combustion, the best briquette was produced when the sawdust-starch ratio and sawdust-gum arabic ratio was 100：25 and 100：35, respectively.

关键词： Azadirachta indica briquette binder level durability rating combustion properties

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Physical and mechanical characteristics of composite briquette from coal and pretreated wood fines

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International Journal of Coal Science & Technology 2021年第5期8卷 1088-1098页

作者： Adekunle Adeleke Jamiu Odusote Peter Ikubanni Olumuyiwa Lasode Madhurai Malathi Dayanand Pasawan Department of Mechanical Engineering Landmark UniversityOmu-AranNigeria Department of Materials and Metallurgical Engineering University of IlorinIlorinNigeria Department of Mechanical Engineering University of IlorinIlorinNigeria Metal Extraction and Recycling Division National Metallurgical LaboratoryJamshedpurIndia

Melina wood torrefied at 260℃ for 60 min was agglomerated with lean grade coal fines into composite briquettes using pitch as *** biomass(3%-20%)and coal fines(80%-97%)were blended together to produce the composite briquettes under a hydraulic press(28 MPa).The briquettes were cured at 300℃.Density,water resistance,drop to fracture,impact resistance,and cold crushing strength were evaluated for the composite *** proximate,ultimate,and calorific value analyses were carried out according to different ASTM *** studies were carried out using scanning electron microscope and electron probe microanalyzer equipped with energy dispersive *** Transform Infrared Spectrophotometer(FTIR)was used to obtain the functional groups in the raw materials and *** density of the composite briquettes ranged from 0.92 to 1.31 g/cm^(3) after *** with95%).The highest cold crushing strength of 4 MPa was obtained for briquettes produced from 97%coal fines and 3%torrefied *** highest drop to fracture(54 times/2 m)and impact resistance index(1350)were obtained for the sample produced from 97%coal and 3%torrefied *** fixed and elemental carbons of the briquettes showed a mild improvement compared to the raw *** peaks from FTIR spectra for the briquettes shows the presence of aromatic C=C bonds and phenolic OH *** composite briquettes with up to 20%torrefied biomass can all be useful as fuel for various applications.

关键词： Composite briquettes Lean grade coal Torrefied biomass Physico-mechanical properties combustion properties

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Characterization of bio-coal briquettes blended from low quality coal and biomass waste treated by Garant■bio-activator and its application for fuel combustion

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International Journal of Coal Science & Technology 2020年第4期7卷 796-806页

作者： Anggoro Tri Mursito Widodo Danang Nor Arifin Research Centre for Geotechnology Indonesian Institute of Sciences(LIPI)Jl.Sangkuriang Komplek LIPIGd.70Bandung 40135Indonesia Assessment Unit for Mining Engineering Jampang Kulon.Indonesian Institute of Sciences(LIPI) Jl.CihaurSimpenan.SukabumiIndonesia

Experimental research was carried out on the manufacturing of bio-coal briquettes from a blend of two different types of low-quality coal and biomass waste in the absence of coal carbonization,where the third blend of the material was fermented by adding a bio-activator solution before pressurizing the components into *** coal samples from Caringin-Garut Regency(BB-Garut)had a low calorific value and a high sulfur content(6.57 wt%),whereas the coal samples from Bayah-Lebak Regency(BB-Bayah)had a higher calorific value and a lower sulfur content(0.51 wt%).The biomass added to the coal blend is in the form of fermented cow dung(Bio-Kohe),and it had a calorific value of 4192 kcal/kg and a total sulfur content of 1.56 wt%.The main objective of this study is to determine the total decrease in the sulfur content in a blend of coal and biomass in which a fennentation process was carried out using a bio-activator for 24 *** used bio-activator was made from Garant■(1:40)+molasses 1 wt%/vol,and its used amount was 0.2 L/***,the total sulfur content in the blend was 1.00 wt%-1.14 wt%,which fulfills the necessary quality requirements for non-carbonized bio-coal *** pyritic and sulfate content in the raw coal was dominant,and the organic sulfur,when fermented with Garant■,was found to be less in the produced bio-coal briquettes by 38%-58%.

关键词： Coal blending Biomass waste Fermentation Briquettes material combustion properties

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Surface physicochemical properties of semi-anthracitic coal from Painan-Sumatra during air oxidation

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International Journal of Coal Science & Technology 2018年第2期5卷 156-166页

作者： Anggoro Tri Mursito Tsuyoshi Hirajima Lina Nur Listiyowati Sudarsono Sudarsono Research Centre for Geotechnology Indonesian Institute of Sciences (LIPI) J1. Sangkuriang Komplek LIPI Gd. 70 Bandung 40135 Indonesia Department of Earth Resources Engineering Faculty of Engineering Kyushu University 744 Motooka Nishiku Fukuoka 819-0395 Japan

Painan coals of West Sumatra were selected as semi-anthracitic coal sample for studying the physicochemical properties such as measurement, evaluation and description of the changes of surface characteristic of coal sample and their oxidation in the atmospheric air at a temperature ranging from 105 to 400 ℃ for 30 min. Several methods are adopted to analyze and discuss several phenomena of the oxidized Painan coal surface during oxidation process for the change in the physicochemical properties as determined by Atomic Force Microscope （AFM）, contact angle, Fourier Transform Infrared Spectroscopy （FTIR）, Thermogravimetric and Differential Thermal Analysis （TG-DTA） analyses as well as other supporting analytical equipment. AFM analyses revealed some changes in adhesion force and surface morphology with more adhesion force available between 0.6 and 8.6 nN on polished coal surfaces due to the increased oxidation temperature. The study revealed that the extent of hydrophobicity of coal surface decreased with the increased of oxidation temperature expressed as contact angles at about 80° and 20°. Another phenomenon occurred during the experiment was hydrophilicity index of coal surface increase at approximately 1.3 and 2.9. Oxidation of coal that occurred with increased temperature also indicated an increase in oxygen content from 3.8% to 22.9 wt%. Increased oxygen functional group also noted that oxidation of coal took place during the treatment. We also found that oxidation treatment also affected the combustion properties of coal： decreasing ignition temperature between 452.9 and 317.6, lowering the reactivity of coal at maximum combustion rate temperature, and reflecting their char characteristics as burnt out, ranging from 652.3 to 648.5 ℃.

关键词： Coal surface Adhesion force Contact angle combustion properties

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