Papers by Rubens Gedraite
Determinação De Condições Operacionais Ótimas No Processo De Deságue Em Peneiras Vibratórias
Anais do Congresso Brasileiro de Sistemas Particulados
Caracterização Do Movimento De Peneira Vibratória Industrial
Anais do Congresso Brasileiro de Sistemas Particulados
Proposta De Uma Malha De Controle De Umidade Do Sólido Retido Em Peneira Vibratória Industrial
Anais do Congresso Brasileiro de Sistemas Particulados
A recuperacao do fluido de perfuracao e importante na operacao de pocos de petroleo sob a otica a... more A recuperacao do fluido de perfuracao e importante na operacao de pocos de petroleo sob a otica ambiental e economica. A remocao dos fragmentos e detritos gerados durante a perfuracao e essencial para permitir o reaproveitamento do fluido, garantir uma melhor eficiencia na sua utilizacao durante o processo de perfuracao bem como evitar o descarte do produto, o qual contem produtos quimicos nocivos para o meio ambiente. Os equipamentos utilizados para a separacao solido-liquido incluem tres grupos sequenciais: peneiras vibratorias, bateria de hidrociclones e centrifuga decantadora. Um dos maiores desafios e caracterizar o tamanho das particulas e material solido nas correntes de entrada e saida das peneiras utilizadas no processo de separacao, contribuindo para a melhoria operacional e aumento da vida util das telas utilizadas e com isso para a melhor qualidade do sistema de tratamento do fluido de perfuracao. Nesse sentido, este trabalho apresenta uma abordagem utilizando algoritmo ...
Clean in Place (Cip) Hygienization of Different Stainless Steel Geometries in Pipelines Contaminated with Pseudomonas Fluorescens
Segurança alimentar e assistência alimentar: Teoria, prática e pesquisa, 2021
Pulsed flow in clean‐in‐place sanitization to improve hygiene and energy savings in dairy industry
Journal of Food Process Engineering, 2020
Evaluation of the residual moisture content in pilot scale vibrating screening operating with pressure reduction in the screen drying region
Powder Technology, 2020
Abstract To study the aspects of solid-liquid separation in vibrating screening operations, exper... more Abstract To study the aspects of solid-liquid separation in vibrating screening operations, experiments were carried out with a 3k experimental design, analyzing the following independent variables: g-force, angle of inclination of the screen, and volumetric concentration of solids in the feed. The influence of a reduction of the pressure on the dewatering process was also taken into account. The results obtained for the screening operation without pressure reduction indicate that the minimum residual moisture content was reached with a g-force of 3.0, screen inclination of 1.5°, and volumetric concentration of 6.0%. Additionally, the use of pressure reduction with a sieve allows for the lowest residual moisture content with a g-force of 3.0, 3.0° screen inclination, and 6.0% volumetric concentration. The major influence of pressure reduction in the residual moisture content was observed for the experiments with 2.0% of volumetric concentration, the lowest level adopted for this variable in the experimental design.
Blucher Chemical Engineering Proceedings, 2019
RESUMO-Este trabalho teve como objetivo realizar um estudo de caso para possibilitar uma melhoria... more RESUMO-Este trabalho teve como objetivo realizar um estudo de caso para possibilitar uma melhoria no sistema de limpeza denominado Clean in Place (CIP) de uma fábrica de sucos em Minas Gerais. O foco do trabalho foi verificar se as concentrações de hidróxido de sódio das soluções de limpeza utilizadas pela empresa estavam dentro dos valores usuais da literatura e, caso negativo, propor novas faixas de concentrações, de forma a garantir a qualidade de limpeza e evitar desperdícios de recursos.
Blucher Chemical Engineering Proceedings, 2019
RESUMO-Neste trabalho foi estudado o comportamento do nível de água controlado automaticamente so... more RESUMO-Neste trabalho foi estudado o comportamento do nível de água controlado automaticamente sobre o leito de areia existente acima de tela de separação tipicamente usada em peneiras industriais. Foi construído um protótipo simples e de baixo custo para permitir avaliar experimentalmente o comportamento do sistema. Os resultados obtidos se mostraram adequados e coerentes com o esperado, tendo o sistema de controle de nível funcionado de forma satisfatória.
Blucher Chemical Engineering Proceedings, 2018
Blucher Chemical Engineering Proceedings, 2018
Lab Scale Vibrating Screen Study on Operational Variables that Affect the Separation Efficiency
Materials Science Forum, 2017
Vibrating screening is an equipment of simple design and execution, but its full description may ... more Vibrating screening is an equipment of simple design and execution, but its full description may be difficult to predict, considering that several variables can influence it. This work evaluates the effects of the independent variables: proportion of particles larger than the screen aperture size, average feed rate and g-force on the separation efficiency of coarse particles in a lab scale vibrating screening, where the material to be screened was phosphate rock, with density of 3.25 g/cm3 and particle size range of 0.6–600 μm. For this, a central composite design (CCD) was applied to quantify the main effects of the variables. As a result, the average feed rate was not relevant and the proportion of coarse particles and the g-force contributed positively to the increase of the efficiency. The point where the variables have their highest values, the maximum experimental efficiency was observed (94.93%).
Blucher Chemical Engineering Proceedings, 2017
Minerals Engineering, 2020
Particulate suspensions systems are present in various industrial sectors, vibrating screens bein... more Particulate suspensions systems are present in various industrial sectors, vibrating screens being some of the most versatile pieces of equipment for the separation of these two phases. This paper presents a study of the dynamics of the mixture on the screen during solid-liquid separation using vibration screening. The independent variables studied were g-force, volumetric concentration of solids in the feed, feed flow rate and inclination of the screen. The equipment used was a vibrating screen of 175 mesh with 95 μm aperture size. The evaluated response variables were the residual moisture content of the retained solids, the screen area occupied by the liquid, the transport velocity of the retained solids and the screen area occupied by the retained solids. The solid material used was sand with a density of 2.67 g/cm 3 and a Sauter mean diameter of 373 μm, and the liquid phase was composed of water containing 0.1% xanthan gum. A central composite design was applied to the experiments and the results for each response were analyzed statistically. It was possible to verify that the increase in the g-force and screen inclination variables increased the operational capacity, since the areas occupied by the liquid and the retained solids were reduced. It was also found that higher volumetric concentrations of solids in the feed favored a reduction in the moisture content of the retained solids and their transport on the screen, since larger particulate material conglomerates were formed, which had a more uniform displacement path.
Rinse model implementation of alkaline detergent in clean‐in‐place process with gradual flow reduction for economy of water and effluent reduction
Journal of Food Process Engineering
Ciências Rurais em Foco – Volume 6, 2022
Modo de acesso: World Wide Web Inclui bibliografia 1. Agricultura 2. Meio Ambiente 3. Zootecnia 4... more Modo de acesso: World Wide Web Inclui bibliografia 1. Agricultura 2. Meio Ambiente 3. Zootecnia 4. Ciências Agrárias I. REDIN, Ezequiel II. Título. CDD-630 Sônia Márcia Soares de Moura-CRB 6/1896 O conteúdo deste livro está licenciado sob a Licença de Atribuição Creative Commons 4.0. Com ela é permitido compartilhar o livro, devendo ser dado o devido crédito, não podendo ser utilizado para fins comerciais e nem ser alterada. O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos seus respectivos autores www.poisson.com.br
Development of a Computational Algorithm Applied to Calculate the Thermal Diffusivity in Conductive Canned Food
This paper presents a contribution to the study of food thermal processing that is heated by cond... more This paper presents a contribution to the study of food thermal processing that is heated by conduction mechanism. It is presented the development of a computational algorithm, to be executed in a personal computer, which takes into account the operating conditions of a stationary autoclave, in order to calculate the thermal diffusivity. A mathematical model was used to predict the temporal evolution of temperature inside the food. The computational performance of algorithm proposed is evaluated by comparing their results with those obtained experimentally. Based on the temperature profile simulated was possible to estimate the average overall thermal diffusivity. The algorithm proposed was tested on basis of commercial applications (AUTOMATE®, EXCEL®, EES®) and showed consistent performance, allowing its use as a tool to support the process development in the area of food engineering
Research, Society and Development, 2020
The presence of biofilms on food processing surfaces is a constant concern and can cause economic... more The presence of biofilms on food processing surfaces is a constant concern and can cause economic damage and impacts on public health. The aim of this work was to evaluate the development of P. fluorescens on the stainless steel surface, to analyze the CIP (clean in place) hygiene considering different geometries, to investigate the flow fluid dynamics and to determine the consumption of the inputs in this process. A circulation line with the characteristics of a dairy was used. The surface sampling was done using the swab technique and the performance of the process was evaluated based on decimal reductions considering the initial population adhered. The fluid dynamics study was carried out with FLUENT software and the consumption was determined by means of flow and electric current sensors. The results showed that P. fluorescens adhered to the surface reaching an average of 4.31 ± 0.26 log CFU∙cm-2, with the production of exopolysaccharides during usual time of industry operation....
CONNEXIO, 2017
O processo tipico de producao de resina acrilica consiste em carregar previamente o reator com so... more O processo tipico de producao de resina acrilica consiste em carregar previamente o reator com solvente orgânico, aquecer ate a temperatura de reacao, por volta de150 °C,e entao iniciar a transferencia simultânea de monomero e iniciador com vazao controlada. Normalmente, alguns minutos apos iniciada a transferencia, tem inicio a reacao exotermica. O aquecimento e resfriamento do reator na maioria das aplicacoes sao feitos atraves da circulacao de fluido termico quente (300 °C) e/ou frio (60 °C) na serpentina do reator. O controle da temperatura do reator e feito modulando a vazao do fluido de aquecimento. As temperaturas da massa reacional e do fluido termico apresentam significativa oscilacao durante a etapa inicial de aquecimento, podendo provocar trincas no material de construcao da jaqueta de aquecimento. O conhecimento do valor efetivo do valor do coeficiente global de transporte de calor e muito importante para permitir o adequado e eficiente controle do processo. O problema e...
This paper describes the applications of hybrid advanced control systems for the optimization of ... more This paper describes the applications of hybrid advanced control systems for the optimization of typical pulp industry processes. Using empirical models obtained from the response to the tests applied to the analyzed processes, the predictive controller adequately made up for the delays and strong existing interactions, reducing the most significant variations for the processes considered. The multivariable predictive controller employed made use of quadratic and/or linear programming to optimize the “cost” functions of causticizing and lime kiln processes. The advanced control system used the association of rule based structures (Fuzzy Logic) for the causticizing and lime kiln processes. The real-time inference of the quality parameter “causticizing efficiency” was made by using the Neural Network. From comparing the results thus obtained to the previously practiced mode of operation it was found out that the implementation of the advanced control system suggested in this paper led...
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Papers by Rubens Gedraite