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Dissertations / Theses on the topic 'Pellet combustion'

Author: Grafiati

Published: 8 September 2021

Last updated: 29 July 2025

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1

Sundberg, Peter. "Implication of pellet quality on combustion performance." Licentiate thesis, Luleå tekniska universitet, Energivetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-83989.

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Quality aspects of wood pellets and their use have been of utmost importance since the development of the pellet market in the early 1980s. Research and hard-earned knowledge have resulted in advancements in the field, but there are still uncertainties in the pellet industry about how different quality aspects affect combustion performance. The focus of this work has been on pellet quality, with investigations divided into three main topics: (1) the effect of physical properties of pellets on their combustion properties, (2) the effect on particle emissions due to manipulation of the ash ch

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2

Hedayati, Ali. "Ash transformation in single-pellet combustion and gasification of biomass with special focus on phosphorus." Licentiate thesis, Luleå tekniska universitet, Energivetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-60525.

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The utilization of different biomass feedstocks in thermal conversion systems can contribute towards mitigation of global warming. However, the formation of different ash fractions (i.e., bottom ash, and fly ash) during thermal conversionof biomass can cause several ash-related problems such as deposit formation, slagging, and particle emissions, all of which may limit its usage as an energy source. It has been found that phosphorus (P), even in relatively low concentrations, can play a vitalrole in the abovementioned ash-related problems. However, the ash transformation reactions occurring in

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3

Johansson, Linus. "Kolmonoxid- och stoftemissioner från småskalig förbränning av pellets med varierande densitet." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-10275.

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Denna rapport baseras på experimentella försök där det undersökts hur pelletdensiteten påverkar utsläpp av kolmonoxid (CO) och stoft vid småskalig förbränning. I en testpanna med ansluten pelletsbrännare testades tre densiteter: låg, mellan och hög. Testerna uppdelades i tre faser i form av uppstart, kontinuerlig drift och släckning. Tre repetitioner gjordes på varje fas och för varje bränsle med undantag av släckning där endast en mätning per bränsle gjordes. Resultatet visade generellt en tydlig skillnad i CO-emission. Oberoende av densitet var CO-emissionerna mycket större vid uppstart och

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4

Win, Kaung Myat. "Emissions from realistic operation of residential wood pellets heating systems." Doctoral thesis, Mälardalens högskola, Framtidens energi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-29582.

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Emissions from residential combustion appliances vary significantly depending on the firing behaviours and combustion conditions, in addition to combustion technologies and fuel quality. Although wood pellet combustion in residential heating boilers is efficient, the combustion conditions during start-up and stop phases are not optimal and produce significantly high emissions such as carbon monoxide and hydrocarbon from incomplete combustion. The emissions from the start-up and stop phases of the pellet boilers are not fully taken into account in test methods for ecolabels which primarily focu

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5

Åkerblom, Hampus, and Roberth Tennesmed. "Lambdareglering : Installation av lambdareglering på pelletsbrännare." Thesis, Linnéuniversitetet, Sjöfartshögskolan (SJÖ), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-90266.

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I Sverige finns det mycket skog att tillgå och en del av skogen används som energikälla för uppvärmning av hus. Många hus värms upp av pelletspannor och det finns många omoderna pelletspannor runt om i Sverige. Denna rapport syftar till att bygga om en pelletspanna av modell Ariterm PX21 från år 2009 med hjälp av lambdareglering.Brännaren idag har ingen teknik som kontrollerar förbränningen. Syftet med lambdaregleringen är att en lambdasond, som ska styra matarskruven till pelletsbrännaren, ska installeras och därmed styra förbränningen. Frågeställningen för arbetet är om en installation av la

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6

Acevedo, Turbi Pahola Annette. "Single biοmass pellet degradatiοn during cοmbustiοn : influence οf raw elemental cοmpοsitiοn determined by LΙBS". Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMIR01.

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La demande mondiale croissante d’énergie et les préoccupations environnementales croissantes ont propulsé l’exploration d’alternatives durables aux sources de carburant conventionnelles. La biomasse se présente comme une ressource renouvelable prometteuse, capable d'atténuer la crise énergétique mondiale tout en garantissant la durabilité environnementale. Cette étude se penche sur le comportement de combustion de trois biomasses distinctes : le bois d'origine forestière, le miscanthus herbacé et la paille d'orge résiduelle agricole. En examinant le comportement des particules individuelles pe

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7

Hedman, Björn. "Dioxin emissions from small-scale combustion of bio-fuel and household waste." Doctoral thesis, Umeå University, Chemistry, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-593.

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<p>Denna avhandling behandlar rökgasutsläpp av persistenta organiska föroreningar, framförallt dioxiner, vid förbränning av fasta biobränslen och torrt hushållsavfall i relativt små anläggningar (5-600 kW) utan avancerad rökgasreningsteknik.</p><p>Samförbränning av avfall och biobränsle i effektiva mindre biobränslepannor testades som en alternativ strategi till den vanligen förekommande storskaliga hanteringen och förbränningen fast hushållsavfall. Medan storskalig förbränning av avfall ger investeringsmässiga fördelar med rökgasreningsteknik etc. kan små lokala anläggningar ha transportmässi

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8

Hampton, Barrett Alexander. "An Evaluation of Induction Heating in Healthcare Food Industry." TopSCHOLAR®, 2018. https://digitalcommons.wku.edu/theses/2078.

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This thesis addresses the problem healthcare facilities are having in maintaining proper food temperatures while transporting meals to patients after food has left the kitchen area. Induction heat has been a known method for generating heat for many years. The commercial food industry currently uses this technology, which is beginning to appear in the residential sector as well because of developments made by manufacturers. This study focuses on the top commercial brand models of induction heaters and the supporting materials currently used to create heat sources to maintain food temperatures

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9

Ponce, Valle Maria Gabriela. "Combustion characteristics of steam-exploded biomass pellets." Thesis, KTH, Energi- och ugnsteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-36199.

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Currently pelletized woody biomass is widely used as a fuel in thermal applications toaccelerate the global transition to renewable energy. Fuel upgrade is one of the key factorsto improve energy conversion processes. Woody biomass can be fractionated into its mainconstituents by steam explosion. Steam-exploded biomass exhibits enhanced heating valueand improves pellet durability. Moreover, there is a significant deviation in thermochemicalbehavior of steam exploded (steam-treated) biomass with respect to the raw material duringpyrolysis. This thesis work concerned combustion characteristics o

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10

Zhu, Xiangyu. "Characterization of wood pellets combustion for clean energy generation." Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILR016.

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Les thèmes de ma recherche sont de quantifier et comparer les caractéristiques de combustion et les émissions polluantes associées des pellets de bois naturel et des pellets noirs torréfiés.En contrôlant tous les paramètres de combustion (air entrant primaire et secondaire, débit de pellets, puissance de la chaudière), les principaux objectifs sont de :- Quantifier et comparer les caractéristiques de combustion des pellets de bois naturels et des pellets torréfiés sur un banc d'essai de combustion bien contrôlé.- De mesurer les émissions de polluants à l'aide d'analyseurs physicochimiques et p

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11

Guo, Wendi. "Self-heating and spontaneous combustion of wood pellets during storage." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/43931.

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Self-heating of wood pellets is a major concern during long term storage. Internal temperatures rose to 57℃ in 10 days in a wood pellet silo of 21.9 m diameter in Fibreco Inc. (Vancouver, Canada) after pellets (about 20℃) were loaded into the silo. Self-heating could lead to serious accidental fires, causing enormous damage and danger to workers. In this study, the self-heating rate at different temperatures was experimentally determined, and the thermal properties were measured. for wood pellets produced in British Columbia, Canada. The factors such as moisture content, pellet age and environ

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12

Yang, Sungmo 1970. "The behavior of biomass pellets during combustion in a thermogravimetric furnace /." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31080.

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In order to utilize biomass as an alternative fuel, biomass pelletization and the fundamental combustion behavior of biomass pellets were studied. The physical and chemical characteristics of biomass powder were also investigated. The pelletization of biomass powder was optimized in order to obtain strong pellets, which can be easily injected to a reactor and burn efficiently without slagging and fouling. Biomass pellets were subjected to a slow heating process using a Thermogravimetric Furnace (TGF) coupled with a Fourier-Transform Infrared Spectrometer (FTIR). The mechanism of biomass pellet

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13

Polimeni, Vallia Nicolas. "Incidenza della qualità del pellet sulle emissioni di una stufa domestica." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10016/.

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Questo lavoro si è posto l’obiettivo di valutare come differenti qualità di pellet di legno, in accordo con la norma EN 14961-2, e la diversa potenza termica di una moderna stufa domestica influenzino le relative emissioni prodotte. La norma EN 14961-2 prevede una serie di proprietà per il pellet di legno con valori caratteristici per ogni classe di qualità, A1, A2 e B. Per simulare le condizioni cui sono sottoposte le emissioni in aria ambiente, il campionamento del particolato è stato effettuato per mezzo di un tunnel di diluizione. Per valutare e co

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14

Wiinikka, Henrik. "High temperature aerosol formation and emission minimisation during combustion of wood pellets /." Luleå : Luleå University of Technology, 2005. http://epubl.luth.se/1402-1544/2005/18.

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15

Jansa, Oldřich. "Porovnání vlastností alternativních pelet." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229503.

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This thesis deals with the alternative pellets and the means of production from raw material to final customer. The theoretical part deals with different techniques and manufacturing technologies used. Furthermore, the work deals with Czech and European legislation in the field of fuel pellets. The practical part deals with measuring and comparing the properties of selected standard pellets.

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16

Sedláček, Daniel. "Analýza energetického využití kávových pelet." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254290.

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The aim of my thesis was to develop a comprehensive study on the energy use of the coffee waste called spent coffee grounds. The study conducted a complete fuel analysis, TGA analysis, experimental drying and pelletization, combustion tests and basic economic evaluation.

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17

Mazau, Sérgio Valdemiro Francisco Alves. "Desenvolvimento e teste de um protótipo funcional de um queimador de pellets." Master's thesis, Universidade de Aveiro, 2007. http://hdl.handle.net/10773/2424.

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Mestrado em Engenharia Mecânica<br>Nesta dissertação desenvolveu-se e testou-se um protótipo funcional de um queimador de pellets para aquecimento de água, passível de ser acoplado em caldeiras a gasóleo com potência nominal entre 15 e 30kW. Numa primeira fase abordou-se o estado da arte no que concerne as caldeiras a gasóleo e a pellets para aquecimento de água, seguiu-se a concepção e dimensionamento do projecto mecânico e eléctrico do sistema de queima de pellets que, em última fase, foi sujeito a testes para a análise e avaliação do seu desempenho energético e ambiental do mesmo. ABSTRAC

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18

Pinho, Miguel Abílio Gomes de Paiva. "Emissões de poluentes atmosféricos da cadeia de biomassa para pellets." Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/15583.

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Mestrado em Engenharia do Ambiente<br>Ao longo das últimas décadas a União Europeia concebeu um conjunto de estratégias climáticas e energéticas promovendo a diminuição das emissões de poluentes atmosféricos e GEE, bem como a diversificação de fontes de energia renováveis. No âmbito da Diretiva 2009/28/CE, Portugal elaborou o seu Plano Nacional de Ação para as Energias Renováveis, fixando os objetivos nacionais para a biomassa florestal e as medidas para o seu cumprimento. Diversos estudos sustentam que a combustão da biomassa para produção de energia e calor é neutra do ponto de vista de bal

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19

Zanetti, Cristian. "Valutazione del contributo emissivo in condizioni non-stazionarie alle emissioni totali di una stufa a pellet domestica." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9023/.

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The aim of this work is to evaluate the emissions of the main pollutants of a pellet stove, by trying to simulate the real use in domestic operations. All the operating phases of this system were considered: ignition, partial load, increase in power, and nominal load. In each phase, quantity and type of some pollutants in emissions were determined: the main pollutant gases (CO, NOx, SO2, H2S and volatile organic compounds (VOCs)), total dust (PM) and its content of polycyclic aromatic hydrocarbons (PAHs), regulated heavy metals (Ni, Cd, As and Pb), main soluble ions and Total Carbon (TC).

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20

Boman, Christoffer. "Particulate and gaseous emissions from residential biomass combustion." Doctoral thesis, Umeå : Univ, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-501.

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21

Ashman, James Mark. "An industry-led investigation for safe storage at full scale of compressed wood pellets including self-heating and spontaneous combustion." Thesis, University of Leeds, 2017. http://etheses.whiterose.ac.uk/17303/.

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Large scale self-heating of wood pellets in storage is a major concern worldwide during long term storage due to the potential for fire with safety concerns for both personnel and plant. Additionally, any adverse publicity resulting from an incident involving biomass is likely to result in negative effects to the biomass industry as a whole. Self-heating could lead to serious accidental fires, causing enormous damage and danger to workers. The aim of the research in this thesis was to provide underpinning data and understanding in order to implement safe storage of wood pellets at Drax Power L

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22

Piednoir, Brice. "Comportement en combustion de résidus de biomasse : mise en évidence de synergies par mélange sous forme de granulés." Thesis, Perpignan, 2017. http://www.theses.fr/2017PERP0066/document.

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La combustion de résidus de biomasse, généralement peu valorisés, pourrait apporter une solution d’approvisionnement intéressante pour la production d’énergie, allégeant la pression sur les ressources forestières. Toutefois, la composition chimique de ces résidus est à l’origine de problèmes techniques autant qu’environnementaux dans les procédés de combustion existants, ce qui limite leur utilisation. Deux de ces problèmes ont été traités dans cette thèse : les émissions de NOX et la quantité de potassium volatilisée lors de la combustion de différents résidus. Des essais de combustion ont ét

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23

Jen, Jen-Fon. "Analysis of Acid Gas Emissions in the Combustion of the Binder Enhanced d-RDF by Ion Chromatography." Thesis, University of North Texas, 1988. https://digital.library.unt.edu/ark:/67531/metadc331848/.

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Waste-to-energy has become an attractive alternative to landfills. One concern in this development is the release of pollutants in the combustion process. The binder enhanced d-RDF pellets satisfy the requirements of environmental acceptance, chemical/biological stability, and being storeable. The acid gas emissions of combusting d-RDF pellets with sulfur-rich coal were analyzed by ion chromatography and decreased when d-RDF pellets were utilized. The results imply the possibility of using d-RDF pellets to substitute for sulfur-rich coal as fuel, and also substantiate the effectiveness of a bi

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24

Cespi, Daniele. "Impatto ambientale di sistemi di riscaldamento domestico a biomasse: applicazione della metodologia LCA (Life Cycle Assessment)." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amslaurea.unibo.it/2544/.

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Le biomasse hanno sempre rappresentato per l’umanità una fonte estremamente versatile e rinnovabile di risorse e tutt’oggi il loro impiego risulta vantaggioso in particolare per produrre energia termica ed elettrica attraverso processi di combustione, sistemi che tuttavia emettono sostanze dannose verso la salute umana e l’ecosistema. Queste pressioni ambientali hanno indotto alcune amministrazioni regionali (fra cui la Lombardia) a bandire temporaneamente l’installazione di nuovi impianti a biomasse, per prevenire e contenere le emissioni in atmosfera a tutela della salute e dell’ambiente. Il

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25

Chen, Yu-Lin, and 陳昱霖. "Numerical Investigation of Combustion Flow Fields Inside a Wood Pellet Fixed-bed Furnace." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/zk7ajp.

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26

Ribeiro, Pedro Emanuel Abreu. "Aglomeração de cinzas numa caldeira a pellets : influência da temperatura e do fluxo de ar." Master's thesis, 2012. http://hdl.handle.net/1822/22600.

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Dissertação de mestrado em Engenharia Mecânica<br>O mercado de equipamentos de queima de pellets residenciais está já bastante desenvolvido em alguns países da Europa como Alemanha, Áustria e Itália. Em Portugal, encontra-se ainda numa fase embrionária, tendo-se verificado um forte crescimento da procura nos últimos tempos. A produção de pellets tem também crescido, sendo essencialmente para exportação. A sua queima, devido à existência de elementos químicos como, por exemplo, Na, K e Si, pode dar origem a cinzas aglomeradas na grelha do queimador, que levantam problemas ao seu bom funci

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27

Fraga, Lelis Gonzaga. "Wood pellets combustion in a fixed bed combustor." Doctoral thesis, 2019. http://hdl.handle.net/1822/66106.

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Doctoral Thesis for PhD Degree in Mechanical Engineering<br>The development of biomass as a future sustainable energy resource, requires the continuous development of technologies that improve its efficiency of conversion and the reduction of harmful emissions to the environment. Biomass can be burned directly from the environmental state or processed through densification in the form of wood pellets. The combustion behavior of pine wood pellets was investigated in this study. The decomposition of wood particles under different heating and air flow rates were analyzed using the TGA devic

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28

Maldonado, Felix Ricardo Charvet. "Performance of biomass pellets in domestic combustion systems." Master's thesis, 2018. http://hdl.handle.net/10773/24605.

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In recent years the use of biomass pellets as an alternative energy source has experienced steady growth. The most widespread process for thermochemical conversion of biomass is combustion. Standardized commercial pellets and non-commercial non-standardized biomass pellets were used in this work. Eight types of biomass pellets were tested during combustion experiments in a pellet stove with a nominal power of 9.5 kWth, and the operating conditions were characterized. The stove used was a Solzaima model Alpes made in Portugal, a technology used for domestic heating. In order to monitor and acqu

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29

Neto, Ana Isabel Vilaça. "Estudo comparativo das emissões de pellets não comerciais numa caldeira doméstica." Master's thesis, 2018. http://hdl.handle.net/10773/26136.

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Os poluentes resultantes da combustão doméstica têm efeitos prejudiciais na saúde pública e causam perturbações na química da atmosfera e no clima. Assim, surgem os pellets como um biocombustível sólido, composto essencialmente por biomassa densificada, com uma qualidade consistente, apresentando um baixo teor de humidade, densidade energética elevada, tamanho e forma homogéneos, associada a uma menor emissão de poluentes atmosféricos no processo de combustão. Atendendo às repercussões das emissões torna-se importante fazer um estudo comparativo de emissões para atmosfera durante a queima de

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30

Lin, Pao-Hsien, and 林保賢. "Preparation of Al2O3 and TiO2 Supported Fe2O3 Pellets for Chemical Looping Combustion and Hydrogen Generation." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/83545278632623288884.

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碩士<br>國立臺灣科技大學<br>化學工程系<br>101<br>Preparation of Fe-based oxygen carriers with support materials as pellets for CLP and hydrogen production was investigated in this study. In order to increase the mechanical strength of carriers, Fe2O3 oxygen carriers were prepared with Al2O3 and TiO2 as inert support with mass ratio of 60/40 by mechanical mixing and pelletized by tablet machine, respectively. The results showed that FeAl320 pellet sintered at 1300 oC had proper mechanical strength and good reactivity. Besides, the FeTi320 pellet sintered at 1100 oC also exhibited adequate mechanical strength

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Ventura, Beatriz Mariano. "Estudo e caracterização de pellets produzidos a partir do engaço da uva." Master's thesis, 2019. http://hdl.handle.net/10773/29423.

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A consciencialização ambiental tem vindo a aumentar, tendo levado ao interesse crescente na valorização material e energética da biomassa. Por outro lado, a legislação é cada vez mais restrita no que diz respeito ao tratamento de resíduos agrícolas. Assim, na presente dissertação estudaram-se e caracterizaram-se pellets produzidos a partir do engaço da uva. Na produção dos pellets foram estudados diferentes teores de humidade, de modo a verificar qual a sua influência nas características físicas do pellet. A nível de caracterização física foram analisados parâmetros como a dimensão, densida

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32

Sherikar, Baburao Neelkantappa. "Investigations of Solution Combustion Process and their Utilization for Bioceramic Applications." Thesis, 2014. http://etd.iisc.ac.in/handle/2005/3015.

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Solution combustion synthesis (SCS) with its origin at IPC department of IISc has been widely practiced for synthesis of oxide materials. It is simple and low cost process, with energy and time savings that can be used to produce homogeneous, high purity, uniformly doped, nano crystalline ceramic powders. The powders characteristics such as crystallite size and surface area are primarily governed by enthalpy, flame temperature of combustion, fuel and fuel to oxidizer ratio ( F/O). In the present work an attempt has been made to investigate the process in order to exercise a control over the p

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Sherikar, Baburao Neelkantappa. "Investigations of Solution Combustion Process and their Utilization for Bioceramic Applications." Thesis, 2014. http://hdl.handle.net/2005/3015.

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Solution combustion synthesis (SCS) with its origin at IPC department of IISc has been widely practiced for synthesis of oxide materials. It is simple and low cost process, with energy and time savings that can be used to produce homogeneous, high purity, uniformly doped, nano crystalline ceramic powders. The powders characteristics such as crystallite size and surface area are primarily governed by enthalpy, flame temperature of combustion, fuel and fuel to oxidizer ratio ( F/O). In the present work an attempt has been made to investigate the process in order to exercise a control over the p

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34

Ferreira, Pedro Tiago Figueiredo Azevedo. "Combustion of alternative biomass fuels in a domestic boiler and in a large-scale furnace." Doctoral thesis, 2016. http://hdl.handle.net/1822/41585.

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Programa Doutoral em Engenharia Mecânica.<br>Biomass is a renewable source of energy, used in combustion on both domestic and industrial applications. Biomass combustion has a high impact in the environment due to the released products, which must be measured and analyzed. The main goal of this work was to study the viability of alternative biomass fuels, both for the economic valorization of these alternative materials and to ease the pressure on the demand of pine sawdust. This viability will depend on the characteristics of the combustion release products and the effects on the combustion e

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35

Matias, Valentim Campos. "Projeto de um queimador de biomassa automático." Master's thesis, 2016. http://hdl.handle.net/10400.26/28898.

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Devido à grande necessidade de energia no mundo, é necessário desenvolver novas tecnologias de geração energia/calor de forma económica, sustentável e ecologicamente assertivas. Um dos combustíveis para aquecimento de ambientes, que mais cresce nos países desenvolvidos é os pellets (granulados de madeira prensada), que são obtidos a partir dos resíduos das serrações, limpezas, a serradura. Para que haja crescimento na utilização dos pellets, é necessário desenvolver tecnologias para a utilização dos mesmos. Existem vários tipos de queimadores a pellets no mercado, sendo a maioria deles i

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