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Authors
Abstract(s)
A indĆŗstria de produĆ§Ć£o de resinas ureicas desempenha um papel fundamental na produĆ§Ć£o de aglomerados de madeira e contraplacados. Por este motivo, Ć© uma Ć”rea de elevado interesse no ponto de vista de melhoria contĆnua e otimizaĆ§Ć£o processual. O presente trabalho foi realizado em ambiente industrial, atravĆ©s de uma parceria entre o Instituto Superior de Engenharia de Lisboa e a Bresfor, S.A., produtora de resinas ureicas. O intuito desta dissertaĆ§Ć£o foca-se na caracterizaĆ§Ć£o do funcionamento de um reator batch, utilizado na produĆ§Ć£o de resinas ureicas (Reator R5). A caracterizaĆ§Ć£o deste reator Ć© de extrema importĆ¢ncia, uma vez que apresenta a maior capacidade na fĆ”brica de resinas, sendo o que contempla tambĆ©m o maior nĆŗmero de ciclos de produĆ§Ć£o. Inicialmente foram realizados estudos Ć duraĆ§Ć£o de cada batch e das respetivas etapas do processo de produĆ§Ć£o. AtravĆ©s desta anĆ”lise foi possĆvel quantificar o tempo despendido em etapas de aquecimento e arrefecimento do reator, permitindo a realizaĆ§Ć£o de balanƧos entĆ”lpicos ao sistema. Dos balanƧos entĆ”lpicos resultou uma anĆ”lise Ć dissipaĆ§Ć£o de calor do reator, possibilidade de investimento em isolamento e de que forma este traria vantagens energĆ©ticas e econĆ³micas ao processo de produĆ§Ć£o. Por fim, foi caracterizada ainda a operaĆ§Ć£o de agitaĆ§Ć£o dentro do reator R5, com auxĆlio de software de DinĆ¢mica de Fluidos Computacional (CFD), de modo a avaliar a distribuiĆ§Ć£o de velocidades do fluido no interior do reator R5. Foram consideradas diferentes condiƧƵes processuais para a realizaĆ§Ć£o deste estudo, como diferentes posiƧƵes das pĆ”s de agitaĆ§Ć£o, viscosidades do fluido e velocidades de agitaĆ§Ć£o.
The industry of urea resin production plays a fundamental role in the production of wood particleboards and plywood. For this reason, it is an area of great interest from the perspective of continuous improvement and process optimization. This dissertation was conducted in na industrial setting through a partnership between Instituto Superior de Engenharia de Lisboa and Bresfor, S.A., a producer of urea resins. The aim of this dissertation is to focus on the characterization of the operation of a batch reactor used in the production of urea resins (Reactor R5). Characterizing this reactor is of utmost importance as it has the highest capacity in the resin factory and involves the highest number of production cycles. Initially, studies were carried out on the duration of each batch and the respective stages of the production process. Through this analysis, it was possible to quantify the time spent on heating and cooling stages of the reactor, allowing for enthalpy balances to be performed on the system. The enthalpy balances resulted in an analysis of the reactor's heat dissipation, the possibility of investing in insulation, and how this would bring energy and economic advantages to the production process. Finally, the mixing operation inside the R5 reactor was also characterized using Computational Fluid Dynamics (CFD) software to evaluate the distribution of the fluid velocity inside the reactor R5 . Different process conditions were considered for this study, such as different agitation positions, fluid viscosities, and agitation speeds.
The industry of urea resin production plays a fundamental role in the production of wood particleboards and plywood. For this reason, it is an area of great interest from the perspective of continuous improvement and process optimization. This dissertation was conducted in na industrial setting through a partnership between Instituto Superior de Engenharia de Lisboa and Bresfor, S.A., a producer of urea resins. The aim of this dissertation is to focus on the characterization of the operation of a batch reactor used in the production of urea resins (Reactor R5). Characterizing this reactor is of utmost importance as it has the highest capacity in the resin factory and involves the highest number of production cycles. Initially, studies were carried out on the duration of each batch and the respective stages of the production process. Through this analysis, it was possible to quantify the time spent on heating and cooling stages of the reactor, allowing for enthalpy balances to be performed on the system. The enthalpy balances resulted in an analysis of the reactor's heat dissipation, the possibility of investing in insulation, and how this would bring energy and economic advantages to the production process. Finally, the mixing operation inside the R5 reactor was also characterized using Computational Fluid Dynamics (CFD) software to evaluate the distribution of the fluid velocity inside the reactor R5 . Different process conditions were considered for this study, such as different agitation positions, fluid viscosities, and agitation speeds.
Description
Trabalho final de Mestrado para obtenĆ§Ć£o do grau de Mestre em Engenharia QuĆmica e BiolĆ³gica āProcessos QuĆmicos
Keywords
Resinas ureicas Reator batch Energia tƩrmica CFD Homogeneidade Urea resins Batch reactor Thermal energy CFD
Citation
Almeida, Joao Jorge Paulino de - CaracterizaĆ§Ć£o do funcionamento de um reator industrial do tipo batch. Lisboa: Instituto Superior de Engenharia de Lisboa, 2023. DissertaĆ§Ć£o de Mestrado