Simulação do processo de secagem de sementes de milho em camada fixa

Souza, Cristiano Márcio Alves de; Queiroz, Daniel Marçal de; Filho, Adílio Flauzino de Lacerda

doi:10.1590/s0103-90162002000400005

Cited by 10 publications

(5 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Ressalta-se que o modelo da Aproximação por Difusão foi recomendado para representação da cinética de secagem de alguns produtos, como café (Resende et al, 2009), feijão e fibra do abacaxi (Waughon & Pena, 2008), dentre outros. Já o modelo de Thompson foi recomendado para representação da cinética de secagem de produtos como: milho (Souza et al, 2002), farelo de mamona (Sousa et al, 2006), dentre outros.…”

Section: Methodsunclassified

Cinética de secagem de sementes de crambe

Faria¹,

Teixeira²,

Devilla

et al. 2012

Rev. bras. eng. agríc. ambient.

View full text Add to dashboard Cite

R ESU M OO estudo da cinética de secagem é de fundamental importância para a modelagem matemática, a qual tem sido muito usada no projeto e em análise dos processos de transferência de calor e de massa, durante a secagem. Buscou-se, então, avaliar a capacidade de ajuste de nove modelos matemáticos comumente utilizados para descrever o processo de secagem em sementes de crambe (Crambe abyssinica Horts), através de um delineamento inteiramente casualizado com três repetições, em que os tratamentos são constituídos de cinco teores de água (0,11; 0,13; 0,17; 0,25 e 0,28 decimal b.s) e cinco temperaturas do ar de secagem (30; 40; 50; 60 e 70 ºC). Para verificação do ajuste dos modelos estudados fez-se análise de regressão não-linear, pelo método Quasi-Newton. De acordo com os dados obtidos concluise que: o modelo da Aproximação por Difusão é o que melhor se ajusta aos dados de secagem obtidos; o aumento da temperatura de secagem promove maior taxa de remoção da água do produto; o coeficiente de difusão apresenta valores da ordem de 0,18 × 10 -10 e 3,92 × 10 -10 m 2 s -1 e a energia de ativação para a difusão líquida foi da ordem de 4,97 kJ mol Drying kinetics of crambe seedsA B ST R A C T Drying kinetics is fundamental for mathematical and modeling widely used in the project and in the analysis of heat and mass transfer during drying. In this study it was sought to assess the capability of adjustment of nine mathematical models commonly used to describe the seed drying process of Crambe abyssinica Horts. The experimental design was completely randomized, with three replications. The treatments were five water contents (0.11; 0.13; 0.17; 0.25 and 0.28 decimal dry weight) and five drying temperatures (30; 40; 50; 60 and 70 ºC). To determine the adjustment of the studied models a non linear regression analyses was performed according to Quasi-Newton method. According to the data obtained it was concluded that: the diffusion approximation method was the model that best adjusted to the drying data obtained; increases in drying temperature promoted higher rate of moisture removal from the seeds; the diffusion coefficient showed values of 0.19 × 10 -10 and 3.9 × 10 -10 m 2 s -1; the activation energy for liquid diffusion during drying of Crambe abyssinica Horts was about 4.97 kJ mol -1 .

show abstract

Section: Methodsunclassified

Cinética de secagem de sementes de crambe

Faria¹,

Teixeira²,

Devilla

et al. 2012

Rev. bras. eng. agríc. ambient.

View full text Add to dashboard Cite

show abstract

“…The variations in the conditions of air and grain in each layer were calculated based on small increments of time. All steps and equations are presented by Souza, Queiroz and Lacerda Filho (2002) and Dalpasquale and Sperandio (2010).…”

Section: Methodsmentioning

confidence: 99%

“…This model is based on energy and mass transfer laws and an empirical equation of thin-layer drying of grain (DALPASQUALE; SPERANDIO, 2010). It was formulated considering the thin layer concept, with a simultaneous change of moisture content, air and grain temperature, and relative humidity (SOUZA; QUEIROZ; LACERDA FILHO, 2002). ) and product flow (kg s ) and height of grain column (m).…”

Section: Introductionmentioning

confidence: 99%

LINSEC: the software for modeling and simulation of grain drying systems

Valente¹,

Queiroz²,

Silva³

et al. 2012

Rev. Ciênc. Agron.

Self Cite

View full text Add to dashboard Cite

-Considering the importance of mathematical models in the development and analysis of grain drying systems, and understanding the need to develop interfaces that will improve the accessibility of these models, this work aimed to: a) implement the Thompson model to simulate grain drying at high temperatures; b) develop an appropriate language to generate drying models; and c) develop a graphical interface with the goal of facilitating user understanding. Thus the computational program LINSEC that was created using the programming language Visual Basic 6.0. LINSEC was highly effective for the modeling and simulation of drying systems and in providing simulated values close to reality. LINSEC is highly flexible and user-friendly during the modeling of several types of dryers.Key words: Grain dryer. Mathematical models. Thompson's model. RESUMO -Tendo em vista a importância dos modelos matemáticos no desenvolvimento e análise de sistemas de secagem, além do conhecimento e necessidade de desenvolver interfaces de modo a aprimorar a acessibilidade e uso destes modelos, este trabalho visou: a) implementar o modelo de Thompson de modo a simular a secagem de grãos a altas temperaturas; b) desenvolver uma linguagem apropriada para gerar sistemas de secagem; e c) desenvolver uma interface gráfica com o objetivo de facilitar o entendimento do usuário, utilizando-se a linguagem Visual Basic 6.0. O programa computacional LINSEC, demonstrou uma alta efetividade na simulação de secagem, fornecendo valores próximos à realidade. É flexível e de fácil utilização pelo usuário durante a simulação para diferentes tipos de secadores. It has been proved that mathematical modeling and simulation are important tools in the development, design and analysis of grain drying systems. These activities normally require programming language skills. Therefore, this scenario indicates the need to develop graphical interfaces that can aid modeling and simulation of drying systems. Therefore, this work presents a computational toolset that provides modeling and simulation drying systems with a graphical interface. Palavras MATERIAL AND METHODSA computational program known as LINSEC was implemented through the use of the program Visual Basic, version 6.0. It is a graphically oriented simulation toolset that allows the assemblage of computational models of grain dryers and simulation of the drying process according to Thompson's model. The organized block structure of the model permits the modeling and simulation of several types of grain drying systems.The blocks are related to air, products and dryers. Each block represents an integral specific part of the drying system. LINSEC disposes of fifteen blocks. In order to model a dryer system, users need to select blocks according to dryer configuration.LINSEC works in the following way: (a) the blocks that represent the drying system parts are inserted in the workspace; (b) the blocks are connected accordingly to the logic that governs the drying systems, leading to the flow sheet of air and p...

show abstract

“…The dryers on the market have a high level of technology, such as: automatic control of the air mixing system, moisture meters of the product flowing in the dryer and control panels that allow control of the entire drying process (Souza et al, 2002). Temperature and drying time are the main variables that affect the quality of the process and the product, it is essential that the temperature of the grain mass is kept within safe limits recommended by CONAB (Villela et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of polycyclic aromatic hydrocarbons (PAHs) in the corn drying process

Mafra

Santos

Merlet

et al. 2021

RSD

View full text Add to dashboard Cite

The pre-processing of agricultural products has great importance in the quality of the product, the most critical process, is the drying of grains, in which thermal energy is demanded. Since biomass burning produces polycyclic aromatic hydrocarbons (PAHs), which can be associated with carcinogenesis The objective of this study was to perform an assessment of the presence of PAHs derived from the maize drying process using Cavaco burning as a fuel source. The experiment was conducted in the municipality of Cascavel-Paraná, in a storage unit located in Colônia Melissa, using a Kepler Weber column dryer model ADS 150, with a capacity of 150 t/h, with an IMTAB chip burner, with capacity of 8,000,000 kcal/h. To assess the presence of PAHs, corn samples were collected at the entry of the product into the storage unit (control) and samples were collected after the drying process with two passes in the dryer, for five days, every hour during eight hours a day, in the period of harvest/2020. All results obtained were below the detectable limit of 0.6 µg/kg. It is concluded with this study that the drying process of corn using chips in burners does not significantly produce PAHs, thus not harming the quality of the grain.

show abstract

Simulação do processo de secagem de sementes de milho em camada fixa

Cited by 10 publications

References 3 publications

Cinética de secagem de sementes de crambe

Cinética de secagem de sementes de crambe

LINSEC: the software for modeling and simulation of grain drying systems

Evaluation of polycyclic aromatic hydrocarbons (PAHs) in the corn drying process

Contact Info

Product

Resources

About