Mostrando ítems 4-9 de 9

Fluid-dynamic study of the behavior of the air inside a textile Stenter

Parra, J W; Quadri, M B; Rodríguez, D C (Journal of Physics: Conference Series, 2021-09-03)

In the textile industry, drying is one of the most important processes. This process requires large investments and high energy consumption, which generates high costs for companies in this sector. In this work, a modeling ...
Mathematical model for production sequencing in a manufacturing company

Parra LLanos, John Wilmer; Caicedo-Rolón, Alvaro Jr; Rivera Cadavid, Leonardo (Journal of Physics: Conference SeriesLondres, Reino Unido, 2019-11-19)

The objective of the research was to determine the optimal sequence of production of n jobs in m operations, in a small footwear manufacturing company with characteristics of a flow shop machine environment, which minimizes ...
OBTENCIÓN DE PASTA CELULÓSICA A PARTIR DE LA PODA GENERADA DE LOS CULTIVOS DE PALMA DE ACEITE (Elaeis guineensis) DE LA REGIÓN DEL CATATUMBO.

RodrÍguez Ordoñez, Dora Cecilia; Parra LLanos, John Wilmer; López Domínguez, Manuel José (Universidad Francisco de Paula SantanderCúcuta, Norte de Santander, 2020-02-02)

El papel, al igual que otros derivados de la pasta de celulosa, como el cartón, son materiales con una infinidad de usos. Con el desarrollo de la tecnología y el uso de los computadores se pensaba que el papel desaparecería, ...
Phenomenological modeling and simulation of a textile stenter

Parra LLanos, John Wilmer; Santos, Rossane; Bastos Quadri, Marintho; Martins, Ianto Oliveira (Textile Research JournalWashintong D.C , Estados Unidos, 2020-04-28)

Mathematical modeling and simulation of cotton fabric drying in a stenter machine was performed using a finite element method. A standard κ-ɛ turbulence model was coupled with heat/mass transfer in porous media models. A ...
Production of bioethanol from rice husk pretreated with alkalis and hydrolyzed with acid cellulase at pilot scale

Cacua Silva, Alejandra; Rodriguez Ordonez, Dora Cecilia; Parra LLanos, John Wilmer (Journal of Physics: Conference Series, 2018-12-07)

Rice husk (RH) is the main biomass byproduct of the rice industry, so much that it corresponds to 20% of the total cereal production and is generally considered a waste. Due to its content of cellulose and hemicellulose, ...
Production sequencing in a flow shop system using optimization and heuristic algorithms

Caicedo-Rolón, Alvaro Jr; Parra LLanos, John Wilmer (Gestao e ProducaoBrasilia,Brasil, 2021-03-31)

The purpose of the research was to determine the sequencing of the production of n jobs in m operations in a small footwear company in an environment of flow shop machine characteristics, which optimizes the total time ...

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Fluid-dynamic study of the behavior of the air inside a textile Stenter
...
Parra, J W | 2021-09-03

In the textile industry, drying is one of the most important processes. This process requires large investments and high energy consumption, which generates high costs for companies in this sector. In this work, a modeling of the behavior of the air was carried out in a textile Stenter, under real operating conditions through the development of fluid-dynamic simulations. For the computational modeling of the problem, a 3D geometry was constructed based on measurements taken from an injector of a textile Stenter. The standard k-ε turbulence model was used in the turbulent flow solution. The equations of the model were solved numerically using the finite element method. The standard k-epsilon turbulence model proved to be a model capable of reproducing the behavior of the air in the injectors of the textile Stenter.

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Mathematical model for production sequencing in a manufacturing company
...
Parra LLanos, John Wilmer | 2019-11-19

The objective of the research was to determine the optimal sequence of production of n jobs in m operations, in a small footwear manufacturing company with characteristics of a flow shop machine environment, which minimizes the total time of completion of jobs in the production system, makespan. A mathematical model of integer linear programming was designed, coded and solved by means of the JuliaPro software. It shows the production sequence that does not consider permutation, and minimizes makespan with 3807 minutes. The mathematical model of optimization is presented as a flexible and valuable tool for operational decision making, which could be replicated in other manufacturing companies, impacting on the improvement of costs and delivery times.

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OBTENCIÓN DE PASTA CELULÓSICA A PARTIR DE LA PODA GENERADA DE LOS CULTIVOS DE PALMA DE ACEITE (Elaeis guineensis) DE LA REGIÓN DEL CATATUMBO.
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RodrÍguez Ordoñez, Dora Cecilia | 2020-02-02

El papel, al igual que otros derivados de la pasta de celulosa, como el cartón, son materiales con una infinidad de usos. Con el desarrollo de la tecnología y el uso de los computadores se pensaba que el papel desaparecería, sin embargo, hoy en día, la fabricación papel y las bobinas de celulosa para otras aplicaciones, se ha mantenido, incluso ha aumentado, siendo un material raramente sustituible por otro. La pasta de celulosa proviene principalmente del tronco de los árboles, lo que tiene una trascendencia fundamental en la sociedad, ya que son millones de árboles los necesarios día a día para la obtención de papel y otros productos relacionados. El uso de materiales lignocelulósicos de desecho, entre ellos, las hojas de palma de aceite (HPA), para la obtención de pasta de celulosa, se presenta como una buena alternativa para sustituir las materias primas convencionales, siendo una opción amigable con el ambiente (Vargas et al., 2013; Ferrer, 2013). Según los datos del Censo Nacional de plantaciones en Colombia, existen más de 140.000 hectáreas cultivadas de palma africana, con la poda que se les realiza a estas palmas, se estima que se obtienen 924.000 toneladas de hojas al año, que en su mayoría se convierten en material de desecho, que pueden llegar a ser la materia prima suficiente para obtener 140.000 toneladas por año de pasta de celulosa para producir papel (Angarita et al., 2009). El cultivo de la palma de aceite y el procesamiento de su fruto es de gran importancia para el departamento Norte de Santander, pues es una de las industrias de la región que más ha generado transformación y desarrollo durante los últimos años en el sector agrícola. Con el desarrollo de este proyecto, se plantea una posible solución a los palmicultores del Catatumbo, al disponer y usar las grandes cantidades de HPA generadas por esta agroindustria como materia prima para obtener pasta de celulosa, dando un valor agregado a este residuo. Por otra parte, también se propone la HPA como una fuente de obtención de celulosa diferente a las materias primas convencionales (los árboles), que ocasiona la deforestación de los bosques, cuando su uso no se hace de manera controlada. Inicialmente se hará una caracterización de la hoja obtenida en la poda y mediante un estudio de las variables de operación del método Kraft, se determinarán las condiciones con las cuales se podrá obtener un mayor rendimiento de pasta de celulosa cruda a partir de las HPA. Obtenida la pasta cruda se hará una caracterización de ésta, para proponer posibles aplicaciones. Con la ejecución de este proyecto se fortalecerán las líneas de investigación “Aprovechamiento industrial de la biomasa vegetal o subproductos de la industria” y “Tecnologías ambientalmente sostenibles” del Grupo de Investigación en Química Básica Aplicada (GIQUIBA).

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Phenomenological modeling and simulation of a textile stenter
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Parra LLanos, John Wilmer | 2020-04-28

Mathematical modeling and simulation of cotton fabric drying in a stenter machine was performed using a finite element method. A standard κ-ɛ turbulence model was coupled with heat/mass transfer in porous media models. A novel approach to simulate all injectors enabled a new perspective of the process and the calculation of local convective coefficients. Three simulations were run: Simulation I reproduced real operational conditions; Simulations II and III estimated the effects of increasing drying air inlet velocity and decreasing translational velocity of the fabric, respectively. The highest drying air velocities occurred at the nozzles on the edges of the injectors, leading to high convective heat and mass transfer coefficients. Results indicated the drying process was not uniform along the fabric’s width. The models were acceptable in realistically predicting the drying of a cotton fabric in a stenter machine and could be useful in optimizing the stenter design considering the final product’s quality and energy consumption.

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Production of bioethanol from rice husk pretreated with alkalis and hydrolyzed with acid cellulase at pilot scale
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Cacua Silva, Alejandra | 2018-12-07

Rice husk (RH) is the main biomass byproduct of the rice industry, so much that it corresponds to 20% of the total cereal production and is generally considered a waste. Due to its content of cellulose and hemicellulose, the RH has a great potential for its alternative use in the production of bioethanol, since it has a great advantage with respect to the conventional raw materials used (sugar cane, corn, beet and sweet sorghum, among others), given that this lignocellulosic material is abundant and does not compete with the food industry. The objective of this work was to obtain bioethanol from rice husk at a pilot scale, taking advantage of its cellulose and hemicellulose content. For this, a sample of 450g of RH was taken, which was pretreated with a 2.00% w/v NaOH solution and subsequently hydrolyzed with acid cellulase (CFB3S). The alcoholic fermentation of total reducing sugars (TRS) obtained in the enzymatic hydrolysis was carried out with Saccharomyces cerevisiae, finally, the fractional distillation of the must was carried out, by means of which four bioethanol samples were obtained with concentrations of 71.3% v/v, 30.0% v/v, 10.3% v/v, and 5.3% v/v of alcohol, which when mixed produced a sample of 95mL of solution with a concentration of 27% v/v alcohol (4.70g/100g of RH).

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Production sequencing in a flow shop system using optimization and heuristic algorithms
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Caicedo-Rolón, Alvaro Jr | 2021-03-31

The purpose of the research was to determine the sequencing of the production of n jobs in m operations in a small footwear company in an environment of flow shop machine characteristics, which optimizes the total time of completion of the job in the production system (Makespan). We used heuristic algorithms that were applied through Lekin and WinQSB softwares, and for the optimization algorithm we designed a mathematical model that was solved by Juliabox software. Results show that the integer linear programming and local search minimize the makespan with 3807 minutes, and different production sequences for each algorithm, which consider permutation, which improves the traditional way of programming the production in 97 minutes, however, the optimization presents better results in the performance measures of average waiting time, average time of flow, and average job in process. Application of heuristic algorithms proves to be simple and fast, but the mathematical model of optimization designed and encoded in the software is a flexible and valuable tool for decision making in production programming, which could be applied in other footwear companies, and in other productive sectors whose companies have the same characteristics of the case study, reducing costs and improving delivery times.

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Repositorio Digital

Listar Química Básica Aplicada – GIQUIBA por título

Fluid-dynamic study of the behavior of the air inside a textile Stenter

Mathematical model for production sequencing in a manufacturing company

OBTENCIÓN DE PASTA CELULÓSICA A PARTIR DE LA PODA GENERADA DE LOS CULTIVOS DE PALMA DE ACEITE (Elaeis guineensis) DE LA REGIÓN DEL CATATUMBO.

Phenomenological modeling and simulation of a textile stenter

Production of bioethanol from rice husk pretreated with alkalis and hydrolyzed with acid cellulase at pilot scale

Production sequencing in a flow shop system using optimization and heuristic algorithms

Envíos recientes

Fluid-dynamic study of the behavior of the air inside a textile Stenter

Mathematical model for production sequencing in a manufacturing company

OBTENCIÓN DE PASTA CELULÓSICA A PARTIR DE LA PODA GENERADA DE LOS CULTIVOS DE PALMA DE ACEITE (Elaeis guineensis) DE LA REGIÓN DEL CATATUMBO.

Phenomenological modeling and simulation of a textile stenter

Production of bioethanol from rice husk pretreated with alkalis and hydrolyzed with acid cellulase at pilot scale

Production sequencing in a flow shop system using optimization and heuristic algorithms

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Listar Química Básica Aplicada – GIQUIBA por título

Fluid-dynamic study of the behavior of the air inside a textile Stenter ﻿

Mathematical model for production sequencing in a manufacturing company ﻿

OBTENCIÓN DE PASTA CELULÓSICA A PARTIR DE LA PODA GENERADA DE LOS CULTIVOS DE PALMA DE ACEITE (Elaeis guineensis) DE LA REGIÓN DEL CATATUMBO. ﻿

Phenomenological modeling and simulation of a textile stenter ﻿

Production of bioethanol from rice husk pretreated with alkalis and hydrolyzed with acid cellulase at pilot scale ﻿

Production sequencing in a flow shop system using optimization and heuristic algorithms ﻿

Envíos recientes

Fluid-dynamic study of the behavior of the air inside a textile Stenter

Mathematical model for production sequencing in a manufacturing company

OBTENCIÓN DE PASTA CELULÓSICA A PARTIR DE LA PODA GENERADA DE LOS CULTIVOS DE PALMA DE ACEITE (Elaeis guineensis) DE LA REGIÓN DEL CATATUMBO.

Phenomenological modeling and simulation of a textile stenter

Production of bioethanol from rice husk pretreated with alkalis and hydrolyzed with acid cellulase at pilot scale

Production sequencing in a flow shop system using optimization and heuristic algorithms

Portales Institucionales

Fluid-dynamic study of the behavior of the air inside a textile Stenter

Mathematical model for production sequencing in a manufacturing company

OBTENCIÓN DE PASTA CELULÓSICA A PARTIR DE LA PODA GENERADA DE LOS CULTIVOS DE PALMA DE ACEITE (Elaeis guineensis) DE LA REGIÓN DEL CATATUMBO.

Phenomenological modeling and simulation of a textile stenter

Production of bioethanol from rice husk pretreated with alkalis and hydrolyzed with acid cellulase at pilot scale

Production sequencing in a flow shop system using optimization and heuristic algorithms