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Dissertations / Theses on the topic 'Kraft recovery boiler'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Edberg, Alexandra. "Monitoring Kraft Recovery Boiler Fouling by Multivariate Data Analysis." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-230906.

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This work deals with fouling in the recovery boiler at Montes del Plata, Uruguay. Multivariate data analysis has been used to analyze the large amount of data that was available in order to investigate how different parameters affect the fouling problems. Principal Component Analysis (PCA) and Partial Least Square Projection (PLS) have in this work been used. PCA has been used to compare average values between time periods with high and low fouling problems while PLS has been used to study the correlation structures between the variables and consequently give an indication of which parameters

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2

Tan, Geng. "Cooling characteristics and thermal properties of kraft recovery boiler smelt." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0027/MQ50374.pdf.

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3

Kermani, Kayhan. "Numerical modeling of sootblower jet flow between superheater platens in a kraft recovery boiler." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ58744.pdf.

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4

Pathania, Nanan. "A study of composition of kraft recovery boiler carryover particles using an Entrained Flow Reactor." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ62920.pdf.

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5

Estes, Matthew J. "Corrosion of composite tube air-ports in kraft recovery boiler: Cr₂O₃, Fe₂O₃, NiO solubility in molten hydroxide." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/7027.

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6

Kulas, Gregory S. "An investigation of some factors affecting the corrosion of carbon steel boiler tube material exposed to simulated kraft smelt." Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/5494.

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7

Ferreira, Daniel José de Oliveira. "Modelagem de caldeira de recuperação química Kraft." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-26072013-122445/.

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O avanço da capacidade do processamento dos computadores e do desenvolvimento de métodos numéricos tem proporcionado ferramentas de modelagem, projeto e otimização cada vez mais eficientes para a constante melhoria de caldeiras de recuperação química Kraft. Dentre as técnicas utilizadas, os modelos CFD abrangentes tem sido empregados nos últimos anos para representar a operação da caldeira de recuperação considerando o maior número possível processos vinculados ao escoamento dos gases de combustão. O presente trabalho busca desenvolver um modelo CFD abrangente considerando o escoamento turbule

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8

Magnusson, Hans. "From recovery boiler to integration of a textile fiber plant : Combination of mass balance analysis and chemical engineering." Licentiate thesis, Karlstads universitet, Institutionen för ingenjörs- och kemivetenskaper, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-37266.

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Modern chemical technology is an efficient tool for solving problems, particularly within the complex environment of the pulp and paper industry, and the combination of experimental studies, mill data and mass balance calculations are of fundamental importance to the development of the industry. In this study various examples are presented, whereby chemical technology is of fundamental importance. It is well documented that under normal conditions the molten salt mixture from the kraft recovery boiler flows down into the dissolving tank without problems. However, in the case of alternatives t

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9

Mikkanen, Pirita. "Fly ash particle formation in kraft recovery boilers /." Espoo [Finland] : Technical Research Centre of Finland, 2000. http://www.vtt.fi/inf/pdf/publications/2000/P421.pdf.

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10

Jones, Andrew K. "A Model of the kraft recovery furnace." Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/5754.

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11

Nwabueze, Obiefuna. "Effect of SO¦2 on dust sintering in kraft recovery boilers." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ58747.pdf.

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12

Vafa, Shermineh. "A transient numerical algorithm to predict temperature and liquid content of carryover in kraft recovery boilers." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ62927.pdf.

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13

Walsh, Allan R. "A computer model for in-flight black liquor combustion in a kraft recovery furnace." Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/7060.

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14

Mao, Tie. "Impact of liquid droplets on solid surfaces and its applications to carryover deposition in kraft recovery boilers." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ28008.pdf.

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15

Ebrahimi-Sabet, Seyed Abdolreza. "A laboratory study of deposit removal by debonding and its application to fireside deposits in kraft recovery boilers." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ58923.pdf.

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16

Chandra, Yusup. "Alkaline pulping deadload reduction studies in chemical recovery system /." Thesis, Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-11162004-132752/unrestricted/Chandra%5FYusup%5F200412%5Fmast.pdf.

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Thesis (M.S.)--Chemical Engineering, Georgia Institute of Technology, 2005.<br>Empie, Jeff, Committee Chair ; Banerjee, Sujit, Committee Member ; Deng, Yulin, Committee Member. Includes bibliographical references.

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17

Sosa, Ivan Raul Herrera. "Sistemas multiagentes para controle inteligente da caldeira de recuperação." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-08012008-110219/.

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Engenheiros têm introduzido um melhor suporte para procedimentos de monitoramento de condições complexas através da aplicação de sistemas descentralizados inteligentes usando uma variedade de técnicas de inteligência artificial. Agora é largamente reconhecido que estes problemas decorrentes da complexidade funcional do monitoramento de condições podem ser resolvidos com arquiteturas que contenham muitos módulos distribuídos e inteligentes, que interajam dinamicamente, os quais são chamados de agentes inteligentes. A tecnologia baseada em agentes tem gerado muita agitação nos últimos anos por c

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18

Almeida, Gustavo Matheus de. "Detecção de situações anormais em caldeiras de recuperação química." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-01122006-155750/.

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O desafio para a área de monitoramento de processos, em indústrias químicas, ainda é a etapa de detecção, com a necessidade de desenvolvimento de sistemas confiáveis. Pode-se resumir que um sistema é confiável, ao ser capaz de detectar as situações anormais, de modo precoce, e, ao mesmo tempo, de minimizar a geração de alarmes falsos. Ao se ter um sistema confiável, pode-se empregá-lo para auxiliar o operador, de fábricas, no processo de tomada de decisões. O objetivo deste estudo é apresentar uma metodologia, baseada na técnica, modelo oculto de Markov (HMM, acrônimo de ?Hidden Markov Model?)

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19

Emami, Babak. "Numerical Simulation of Kraft Recovery Boiler Sootblower Jets." Thesis, 2009. http://hdl.handle.net/1807/19028.

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The fouling of heat transfer surfaces in kraft recovery boilers is a significant concern for the pulp and paper industry. The usual approach to controlling fouling is the use of so-called ``sootblowers,'' that utilize boiler steam to generate supersonic steam jets that are literally used to knock deposits off of the boiler tubes. About 3 to 10\% of the total steam produced in a recovery boiler is used for sootblowing. This high energy cost demands that they be operated as efficiently as possible. It is thus essential to devise improved strategies for maximizing sootblower efficiency and minimi

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20

Saturnino, Daniel Moreira. "The solubility of kraft recovery boiler precipitator ash." 2006. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=450312&T=F.

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21

Ketler, Stephen Paul. "Physical flow modelling of a kraft recovery boiler." Thesis, 1993. http://hdl.handle.net/2429/4889.

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Measurements of the vertical, and one horizontal, components of velocity have been made in an isothermal scale model of a kraft black liquor recovery boiler. The model used water as the working fluid, and was a 1:28 scale representation of an operating recovery boiler in Plymouth, North Carolina. All of the air ports were represented in the model; however, the char bed shape, mass flow from the bed, and liquor flow were not. Laser-Doppler velocimetry was used to measure velocities and power spectral densities in the model on a 6x6 grid of points on three horizontal planes. Quantitative f

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22

Taranenko, Anton. "Shattering Kraft Recovery Boiler Smelt by a Steam Jet." Thesis, 2013. http://hdl.handle.net/1807/35142.

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Kraft recovery boiler smelt is shattered into small droplets by an impinging steam jet to prevent smelt-water explosions in the dissolving tank. Inadequate shattering increases the likelihood of dissolving tank explosions. While industry has not dedicated much effort to smelt shattering, the safety implications require smelt shattering to be studied in detail. An experimental set-up was constructed to simulate the shattering operation using a water-glycerine solution and air instead of smelt and steam respectively. The objective was to examine how physical properties and flow characteristics a

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23

Boonsongsup, Lerssak. "SO�� capture and HCl release at Kraft recovery boiler conditions." Thesis, 1993. http://hdl.handle.net/1957/35778.

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24

Sretenovic, Ivan. "Factors Affecting the Resistivity of Recovery Boiler Precipitator Ash." Thesis, 2012. http://hdl.handle.net/1807/32628.

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Electrostatic precipitators (ESPs) are commonly used to control particulate emissions from recovery boilers in the kraft pulping process. The electrical resistivity of entrained particulates is known to affect the performance of ESPs. There are many factors which influence resistivity of particulate matter, such as field strength, time of exposure, particle size, particle composition, temperature, and flue gas composition. The objective of this study was to identify the ideal operating conditions and dust particle characteristics which lead to an optimum dust resistivity and maximized ESP effi

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25

Khalaj-Zadeh, Asghar. "A Study of the Composition of Carryover Particles in Kraft Recovery Boilers." Thesis, 2008. http://hdl.handle.net/1807/16723.

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Carryover particles are partially/completely burned black liquor particles entrained in the flue gas in kraft recovery boilers. Understanding how carryover particles form and deposit on heat transfer tube surfaces is critically important in the design and operation of a recovery boiler. The tendency for a carryover particle to deposit on a tube surface depends on the particle temperature and composition at the moment of impact. This study was the first to examine systematically how carryover particle composition changes with the black liquor chemistry and burning conditions. The effect of bl

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26

Chan, Sidney. "Investigation into the effects of swirl on mixing within a Kraft recovery boiler." Thesis, 1996. http://hdl.handle.net/2429/5716.

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Experiments were performed to evaluate the effects of swirl on mixing in a Kraft recovery boiler. A 1/28 geometrical scale physical model with water as the working fluid was studied by means of laser Doppler velocimetry, L D V , and particle tracking. Flow field and mixing characteristics were measured in the boiler model for three alternative conditions: i) the "balanced" case where all the primary and secondary, ports were open, ii) a slight swirl case in which 2 secondary corner ports, out of 18, were closed, and iii) a "strong swirl" case in which 4 secondary corner ports were closed

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27

Aghdasi, Fariba F. "Effects of buoyacy on jets in crossflow: application to the kraft recovery boiler." Thesis, 1994. http://hdl.handle.net/2429/6981.

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This thesis investigates the effect of buoyancy forces on jets in a crossflow, with specific application to kraft recovery furnaces. Both experimental and numerical studies are presented. Experiments were conducted to investigate the concentration profiles of variable density slot jets issuing into a confined crossflow. A recently-developed multigrid computational fluid dynamics code is used to find the flow pattern of variable density jets in a crossflow. The governing equations of motion for non-isothermal flow, i.e. mass continuity, Navier-Stokes equations, and energy equation, are discret

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28

Jordão, Nuno Alexandre Carracho. "Influência das características de combustão no desempenho energético e ambiental da caldeira de recuperação." Master's thesis, 2014. http://hdl.handle.net/10316/38929.

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Dissertação de Mestrado Integrado em Engenharia Mecânica apresentada à Faculdade de Ciências e Tecnologia da Universidade de Coimbra<br>Este trabalho resultou da colaboração entre o DEM-FCTUC e a CELBI, do grupo Altri. O conteúdo diz respeito à análise dos fluxos de massa e energia na caldeira de recuperação para o objetivo de avaliar o rendimento global e parcial de alguns equipamentos da sua instalação. A CELBI é uma unidade de produção de pasta de eucalipto branqueada, segundo o processo kraft. A caldeira de recuperação usa como combustível principal o licor negro, extraído do digestor e co

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29

Techakijkajorn, Udom. "Sintering of fume deposits in kraft recovery boilers." Thesis, 1995. http://hdl.handle.net/1957/34899.

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Fume, sub-micron aerosal particles in the combustion gases, have been identified as a cause of extensive plugging and fouling in the heat transfer section of a kraft recovery boiler in kraft pulp mills. After the deposition on the heat transfer surface, fume deposits will undergo the sintering process which causes densification and hardening, making them hard to remove. There has been relatively little information available on the kinetics of the sintering of fume particles, and no information on the modeling of the sintering process of this particular material. No conclusion about the effect

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30

Versteeg, Peter Lars. "A multivariate analysis of fouling in kraft recovery boilers." 2007. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=788890&T=F.

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31

Pophali, Ameya. "Interaction between a Supersonic Jet and Tubes in Kraft Recovery Boilers." Thesis, 2011. http://hdl.handle.net/1807/31903.

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Sootblowing is a process in which supersonic steam jets are used to periodically blast deposits off heat transfer tubes in kraft recovery boilers. However, sootblowing significantly consumes the valuable high pressure steam generated by the boiler, hence it should be optimized. A recovery boiler consists of three convective sections - superheater, generating bank and economizer. The tube arrangement in these sections, particularly the tube spacing is different from each other. Moreover, tubes in an economizer are finned. A sootblower jet will interact differently with these tube arrangements,

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32

Samretvanich, Artit. "Determination of the optical constants of ash samples from kraft recovery boilers." Thesis, 1997. http://hdl.handle.net/1957/34382.

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33

Zhao, Liming. "The Effectiveness of Magnesium Oxide-based Additives in Mitigating Fouling Problems in Kraft Recovery Boilers." Thesis, 2011. http://hdl.handle.net/1807/31663.

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Magnesium oxide-based additives have been used in kraft recovery boilers to minimize deposit accumulation on superheater and generating bank tubes. Due to inconclusive results observed in boilers and claims made for additive effectiveness backed by little scientific evidence, only a few mills still use the additives for fouling control. A systematic study was performed to examine the effect of MgO-based additives on deposit accumulation and removal under controlled laboratory conditions, and to evaluate the additive effect in a kraft recovery boiler. The results show that while the additive co

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