Especialización Gerencia de la Cadena de Valor y Productividad
URI permanente para esta colecciónhttp://hdl.handle.net/11634/71932
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Tipo de ítem: Ítem , Análisis de las Variables que Influyen en la Calidad de Coque Metalurgico(Universidad Santo Tomás, 2026-04-09) Gil Buitrago, Deycy Milena; Quintero Navarro, Geider; Universidad Santo Tomás; https://scienti.minciencias.gov.co/cvlac/visualizador/generarCurriculoCv.do?cod_rh=0001662439; https://orcid.org/0000-0002-8278-4501This paper analyzes the main variables involved in the blending of coking coals for metallurgical coke production. The primary objective is to establish the necessary parameters for obtaining high-quality metallurgical coke that meets international standards and ensures optimal performance in blast furnaces during steel production. The Deming Cycle (PDCA) is incorporated as a continuous improvement strategy to generate value for the customer and create a competitive advantage in the international market. The variables analyzed include coal particle size distribution, reflectance, flowability, free swelling index, coal ash content, time, temperature, and charge density. Laboratory analyses were conducted to observe the behavior of each variable and its influence on the blends. Additionally, coke production results were evaluated, primarily considering cold mechanical strength, ash content, volatile matter content, CSR (Coke Strength after Reaction), and CRI (Coke Reactivity Index).The study was complemented by a literature review of previous research by various authors, and by the author's professional experience in quality control of minerals used in the steelmaking process.Tipo de ítem: Ítem , Influencia de la Humedad Relativa en la Tasa de Secado del Arroz Paddy, con Enfoque en la Productividad Agroindustrial(Universidad Santo Tomás, 2026-03-26) Alarcón Salgado, Diego Fabian; Trujillo Manrique, Jaime; Universidad Santo Tomás; https://scienti.minciencias.gov.co/cvlac/visualizador/generarCurriculoCv.do?cod_rh=0001685185; https://orcid.org/0000-0001-7437-0299Paddy rice drying represents a critical stage within the agro - industrial value chain due to its direct influence on grain quality, energy efficiency, and overall process productivity. Among the environmental factors affecting the drying process, air moisture content plays a key role by modifying the partial vapor pressure, equilibrium moisture content, and the rate of mass transfer between the grain and the surrounding environment. The purpose of this study is to analyze the influence of relative humidity on the drying rate of paddy rice and its implications for the operational efficiency of drying systems used in the rice agro-industry. This research article was developed using a mixed methodological approach. First, a systematic review of scientific literature was conducted using indexed databases such as Scopus, ScienceDirect, Springer, Wiley, SciELO, Google Scholar, and Redalyc. Search equations based on Boolean operators and predefined inclusion criteria were applied. From an initial pool of 220 documents, 40 relevant studies related to paddy rice drying kinetics and the influence of environmental variables were selected. Second, operational data from the drying system of Federal S.A.S., a rice milling company located in the Tolima department (Colombia), were analyzed. The evaluated variables included ambient relative humidity, initial and final grain moisture content, drying time, and moisture removal rate. The results indicate that increases in relative humidity significantly reduce the drying constant in commonly used models such as Newton, Page, and Henderson–Pabis, leading to longer drying times and reduced system efficiency. Consistently, the operational data analyzed show that under high relative humidity conditions (≥85%), the drying rate can decrease to approximately 0.40%/h, confirming the critical influence of this variable on the performance of the drying process.