Secagem do resíduo industrial da acerola em leito de jorro: estudos fluidodinâmicos e análise do desempenho do secador
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFRN |
Texto Completo: | https://repositorio.ufrn.br/jspui/handle/123456789/15831 |
Resumo: | In this research, the drying process of acerola waste was investigated by using a spouted bed drier. The process was conducted using high density polyethylene inert particles with the objective of producing an ascorbic acid-rich final product. The fruit waste was ground and used to prepare different water-maltodextrin suspensions. Initially, fluidynamical experiments were conducted in order to evaluate the feeding effect on the spouted bed drier fluidynamics behavior. The experimental planning 23 + 3 was used to investigate the effect of the following variables: solids concentration, drying air temperature, intermittence time, production efficiency, solids retention and product losses by elutriation of fine particles on drier walls. The effect of selected independent variables on the drier stability was also evaluated based on a parameter defined as the ratio between the feed suspension volume and the total inert particles volume. Finally, the powder quality was verified in experiments with fixed feed flow and varying air drying temperature, drying air velocity and intermittence time. It was observed that the suspension interferes in the spouted bed drier fluidynamics behavior, and higher air flow is necessary to stabilize the drier. The suspension also promotes the expansion of the spouted bed diameter, decreases the solid circulation and favors the air distribution at the flush area. All variables interfere in the spouted bed performance, and the solids concentration has a major effect on the material retention and losses. The intermittence time also has great effect on the stability and material retention. When it comes to production efficiency, the main effect observed was the drying air temperature. First order models were well adjusted to retention and losses data. The acerola powder presented ascorbic acid levels around 600 to 700 mg/100g. Similar moisture and ascorbic acid levels were obtained for powders obtained by spouted bed and spray drier. However, the powder production efficiency of the spray drier was lower when compared to spouted bed drier. When it comes to energetic analysis, the spray drier process was superior. The results obtained for spouted bed drier are promising and highly dependent on the operational parameters chosen, but in general, it is inferred that this drying process is adequate for paste and suspension drying |
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Souza Júnior, Francisco Escolástico dehttp://lattes.cnpq.br/9384942998866102http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4788622A0Correia, Roberta Targino Pintohttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798196E6Matsui, Kátia Nicolauhttp://lattes.cnpq.br/3253316004789881Jerônimo, Carlos Enrique de Medeiroshttp://lattes.cnpq.br/9996525070555805Alsina, Odelsia Leonor Sanchez dehttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783955Z6Medeiros, Maria de Fátima Dantas de2014-12-17T15:01:30Z2013-04-182014-12-17T15:01:30Z2012-08-06SOUZA JÚNIOR, Francisco Escolástico de. Drying of process acerola waste in spouted bed: Study of fluid dynamics and analyze of performance of the dryer. 2012. 126 f. Dissertação (Mestrado em Pesquisa e Desenvolvimento de Tecnologias Regionais) - Universidade Federal do Rio Grande do Norte, Natal, 2012.https://repositorio.ufrn.br/jspui/handle/123456789/15831In this research, the drying process of acerola waste was investigated by using a spouted bed drier. The process was conducted using high density polyethylene inert particles with the objective of producing an ascorbic acid-rich final product. The fruit waste was ground and used to prepare different water-maltodextrin suspensions. Initially, fluidynamical experiments were conducted in order to evaluate the feeding effect on the spouted bed drier fluidynamics behavior. The experimental planning 23 + 3 was used to investigate the effect of the following variables: solids concentration, drying air temperature, intermittence time, production efficiency, solids retention and product losses by elutriation of fine particles on drier walls. The effect of selected independent variables on the drier stability was also evaluated based on a parameter defined as the ratio between the feed suspension volume and the total inert particles volume. Finally, the powder quality was verified in experiments with fixed feed flow and varying air drying temperature, drying air velocity and intermittence time. It was observed that the suspension interferes in the spouted bed drier fluidynamics behavior, and higher air flow is necessary to stabilize the drier. The suspension also promotes the expansion of the spouted bed diameter, decreases the solid circulation and favors the air distribution at the flush area. All variables interfere in the spouted bed performance, and the solids concentration has a major effect on the material retention and losses. The intermittence time also has great effect on the stability and material retention. When it comes to production efficiency, the main effect observed was the drying air temperature. First order models were well adjusted to retention and losses data. The acerola powder presented ascorbic acid levels around 600 to 700 mg/100g. Similar moisture and ascorbic acid levels were obtained for powders obtained by spouted bed and spray drier. However, the powder production efficiency of the spray drier was lower when compared to spouted bed drier. When it comes to energetic analysis, the spray drier process was superior. The results obtained for spouted bed drier are promising and highly dependent on the operational parameters chosen, but in general, it is inferred that this drying process is adequate for paste and suspension dryingNo presente trabalho estudou-se a secagem do resíduo industrial da acerola em secador de leito de jorro com partículas inertes de polietileno de alta densidade, visando a obtenção de um produto seco com elevado valor agregado, principalmente no que concerne ao teor de ácido ascórbico. O resíduo foi triturado, preparando-se uma suspensão com adição de água e de maltodextrina em diferentes proporções. Realizou-se inicialmente uma série de experimentos fluidodinâmicos para avaliar o efeito da alimentação da suspensão sobre o comportamento fluidodinâmico do leito de jorro. Realizaram-se experimentos de secagem com base em um planejamento experimental 23 com 3 réplicas no ponto central, onde foram avaliados os efeitos das variáveis, teor de sólidos, temperatura do ar de secagem e tempo de intermitência sobre a umidade, eficiência de produção, retenção de material no leito e perdas do produto em pó por elutriação de finos e aderido às paredes do equipamento. Analisaram-se também os efeitos das variáveis independentes sobre a estabilidade do secador representada a partir de um parâmetro definido pela razão entre o volume de suspensão alimentado ao leito e o volume total das partículas inertes. Finalmente, com o objetivo de se verificar o desempenho do processo no que se refere à qualidade do pó, realizaram-se na concentração de sólidos mais favorável a obtenção do pó, experimentos de secagem fixando-se a vazão de alimentação e variando-se a temperatura e velocidade do ar de secagem e o tempo de intermitência. De acordo com os resultados obtidos, a suspensão interfere de forma importante no comportamento fluidodinâmico do leito, necessitando de maior vazão de ar para manter as condições de jorro. A suspensão promove expansão no diâmetro do jorro, diminui a taxa de circulação de sólidos além de favorecer a distribuição do ar na região do jorro. Com respeito aos experimentos realizados conforme o planejamento experimental, todas as variáveis interferiram no desempenho do secador, destacando-se o importante efeito do teor de sólidos sobre a retenção de material no leito e perdas, bem como o efeito da intermitência sobre a estabilidade e retenção de material no leito. Na eficiência de produção o efeito principal foi atribuído à temperatura do ar de secagem. Foram obtidos modelos de primeira ordem que se ajustaram bem aos dados de retenção e perdas. Em relação aos experimentos finais, foram obtidos pós com teor de ácido ascórbico na faixa de 600 a 700 mg/100g. Os resultados desses experimentos foram comparados com os resultados obtidos na secagem da mesma suspensão, em spray dryer. A secagem no spray dryer forneceu um produto com teores de umidade e de ácido ascórbico compatíveis com o produzido no jorro, todavia na condição de operação testada a eficiência de produção de pó no spray foi inferior a do jorro. A comparação dos dois processos mediante análise dos recursos energéticos favorece a operação de secagem no spray dryer. Todavia, os resultados obtidos no secador de leito de jorro são promissores, demonstrando que dependendo do ajuste das condições operacionais este secador se adéqua bem a secagem de pastas e suspensõesConselho Nacional de Desenvolvimento Científico e Tecnológicoapplication/pdfporUniversidade Federal do Rio Grande do NortePrograma de Pós-Graduação em Engenharia QuímicaUFRNBRPesquisa e Desenvolvimento de Tecnologias RegionaisLeito de jorro. Secagem. Fluidodinâmica. Resíduo. AcerolaSpouted bed drier. Drying. Fluidynamics. Waste. AcerolaCNPQ::ENGENHARIAS::ENGENHARIA QUIMICASecagem do resíduo industrial da acerola em leito de jorro: estudos fluidodinâmicos e análise do desempenho do secadorDrying of process acerola waste in spouted bed: Study of fluid dynamics and analyze of performance of the dryerinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRNinstname:Universidade Federal do Rio Grande do Norte (UFRN)instacron:UFRNORIGINALFranciscoESJ_DISSERT.pdfapplication/pdf2170552https://repositorio.ufrn.br/bitstream/123456789/15831/1/FranciscoESJ_DISSERT.pdf7eb8333582d6093d8dba28f6fb660743MD51TEXTFranciscoESJ_DISSERT.pdf.txtFranciscoESJ_DISSERT.pdf.txtExtracted texttext/plain223494https://repositorio.ufrn.br/bitstream/123456789/15831/6/FranciscoESJ_DISSERT.pdf.txtb2affa5bb5f611b1257e1f0e4b447c8bMD56THUMBNAILFranciscoESJ_DISSERT.pdf.jpgFranciscoESJ_DISSERT.pdf.jpgIM Thumbnailimage/jpeg4590https://repositorio.ufrn.br/bitstream/123456789/15831/7/FranciscoESJ_DISSERT.pdf.jpge88c243a9cf9cd57cca3de20e0090308MD57123456789/158312017-11-02 04:10:55.926oai:https://repositorio.ufrn.br:123456789/15831Repositório de PublicaçõesPUBhttp://repositorio.ufrn.br/oai/opendoar:2017-11-02T07:10:55Repositório Institucional da UFRN - Universidade Federal do Rio Grande do Norte (UFRN)false |
dc.title.por.fl_str_mv |
Secagem do resíduo industrial da acerola em leito de jorro: estudos fluidodinâmicos e análise do desempenho do secador |
dc.title.alternative.eng.fl_str_mv |
Drying of process acerola waste in spouted bed: Study of fluid dynamics and analyze of performance of the dryer |
title |
Secagem do resíduo industrial da acerola em leito de jorro: estudos fluidodinâmicos e análise do desempenho do secador |
spellingShingle |
Secagem do resíduo industrial da acerola em leito de jorro: estudos fluidodinâmicos e análise do desempenho do secador Souza Júnior, Francisco Escolástico de Leito de jorro. Secagem. Fluidodinâmica. Resíduo. Acerola Spouted bed drier. Drying. Fluidynamics. Waste. Acerola CNPQ::ENGENHARIAS::ENGENHARIA QUIMICA |
title_short |
Secagem do resíduo industrial da acerola em leito de jorro: estudos fluidodinâmicos e análise do desempenho do secador |
title_full |
Secagem do resíduo industrial da acerola em leito de jorro: estudos fluidodinâmicos e análise do desempenho do secador |
title_fullStr |
Secagem do resíduo industrial da acerola em leito de jorro: estudos fluidodinâmicos e análise do desempenho do secador |
title_full_unstemmed |
Secagem do resíduo industrial da acerola em leito de jorro: estudos fluidodinâmicos e análise do desempenho do secador |
title_sort |
Secagem do resíduo industrial da acerola em leito de jorro: estudos fluidodinâmicos e análise do desempenho do secador |
author |
Souza Júnior, Francisco Escolástico de |
author_facet |
Souza Júnior, Francisco Escolástico de |
author_role |
author |
dc.contributor.authorID.por.fl_str_mv |
|
dc.contributor.authorLattes.por.fl_str_mv |
http://lattes.cnpq.br/9384942998866102 |
dc.contributor.advisorID.por.fl_str_mv |
|
dc.contributor.advisorLattes.por.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4788622A0 |
dc.contributor.referees1.pt_BR.fl_str_mv |
Correia, Roberta Targino Pinto |
dc.contributor.referees1ID.por.fl_str_mv |
|
dc.contributor.referees1Lattes.por.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798196E6 |
dc.contributor.referees2.pt_BR.fl_str_mv |
Matsui, Kátia Nicolau |
dc.contributor.referees2ID.por.fl_str_mv |
|
dc.contributor.referees2Lattes.por.fl_str_mv |
http://lattes.cnpq.br/3253316004789881 |
dc.contributor.referees3.pt_BR.fl_str_mv |
Jerônimo, Carlos Enrique de Medeiros |
dc.contributor.referees3ID.por.fl_str_mv |
|
dc.contributor.referees3Lattes.por.fl_str_mv |
http://lattes.cnpq.br/9996525070555805 |
dc.contributor.referees4.pt_BR.fl_str_mv |
Alsina, Odelsia Leonor Sanchez de |
dc.contributor.referees4ID.por.fl_str_mv |
|
dc.contributor.referees4Lattes.por.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783955Z6 |
dc.contributor.author.fl_str_mv |
Souza Júnior, Francisco Escolástico de |
dc.contributor.advisor1.fl_str_mv |
Medeiros, Maria de Fátima Dantas de |
contributor_str_mv |
Medeiros, Maria de Fátima Dantas de |
dc.subject.por.fl_str_mv |
Leito de jorro. Secagem. Fluidodinâmica. Resíduo. Acerola |
topic |
Leito de jorro. Secagem. Fluidodinâmica. Resíduo. Acerola Spouted bed drier. Drying. Fluidynamics. Waste. Acerola CNPQ::ENGENHARIAS::ENGENHARIA QUIMICA |
dc.subject.eng.fl_str_mv |
Spouted bed drier. Drying. Fluidynamics. Waste. Acerola |
dc.subject.cnpq.fl_str_mv |
CNPQ::ENGENHARIAS::ENGENHARIA QUIMICA |
description |
In this research, the drying process of acerola waste was investigated by using a spouted bed drier. The process was conducted using high density polyethylene inert particles with the objective of producing an ascorbic acid-rich final product. The fruit waste was ground and used to prepare different water-maltodextrin suspensions. Initially, fluidynamical experiments were conducted in order to evaluate the feeding effect on the spouted bed drier fluidynamics behavior. The experimental planning 23 + 3 was used to investigate the effect of the following variables: solids concentration, drying air temperature, intermittence time, production efficiency, solids retention and product losses by elutriation of fine particles on drier walls. The effect of selected independent variables on the drier stability was also evaluated based on a parameter defined as the ratio between the feed suspension volume and the total inert particles volume. Finally, the powder quality was verified in experiments with fixed feed flow and varying air drying temperature, drying air velocity and intermittence time. It was observed that the suspension interferes in the spouted bed drier fluidynamics behavior, and higher air flow is necessary to stabilize the drier. The suspension also promotes the expansion of the spouted bed diameter, decreases the solid circulation and favors the air distribution at the flush area. All variables interfere in the spouted bed performance, and the solids concentration has a major effect on the material retention and losses. The intermittence time also has great effect on the stability and material retention. When it comes to production efficiency, the main effect observed was the drying air temperature. First order models were well adjusted to retention and losses data. The acerola powder presented ascorbic acid levels around 600 to 700 mg/100g. Similar moisture and ascorbic acid levels were obtained for powders obtained by spouted bed and spray drier. However, the powder production efficiency of the spray drier was lower when compared to spouted bed drier. When it comes to energetic analysis, the spray drier process was superior. The results obtained for spouted bed drier are promising and highly dependent on the operational parameters chosen, but in general, it is inferred that this drying process is adequate for paste and suspension drying |
publishDate |
2012 |
dc.date.issued.fl_str_mv |
2012-08-06 |
dc.date.available.fl_str_mv |
2013-04-18 2014-12-17T15:01:30Z |
dc.date.accessioned.fl_str_mv |
2014-12-17T15:01:30Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
SOUZA JÚNIOR, Francisco Escolástico de. Drying of process acerola waste in spouted bed: Study of fluid dynamics and analyze of performance of the dryer. 2012. 126 f. Dissertação (Mestrado em Pesquisa e Desenvolvimento de Tecnologias Regionais) - Universidade Federal do Rio Grande do Norte, Natal, 2012. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufrn.br/jspui/handle/123456789/15831 |
identifier_str_mv |
SOUZA JÚNIOR, Francisco Escolástico de. Drying of process acerola waste in spouted bed: Study of fluid dynamics and analyze of performance of the dryer. 2012. 126 f. Dissertação (Mestrado em Pesquisa e Desenvolvimento de Tecnologias Regionais) - Universidade Federal do Rio Grande do Norte, Natal, 2012. |
url |
https://repositorio.ufrn.br/jspui/handle/123456789/15831 |
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por |
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por |
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info:eu-repo/semantics/openAccess |
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openAccess |
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Universidade Federal do Rio Grande do Norte |
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Programa de Pós-Graduação em Engenharia Química |
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UFRN |
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BR |
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Pesquisa e Desenvolvimento de Tecnologias Regionais |
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Universidade Federal do Rio Grande do Norte |
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