Browsing by Author "Chang Liu, Mingtsu Leonardo"

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    Evaluación técnico-económica de la implementación de grúas estacionarias en el sistema de alimentación de Aserradero El Colorado – Arauco.
    (Universidad de Concepción, 2024) Chang Liu, Mingtsu Leonardo; Jiménez del Río, Jorge Rodrigo
    The forestry sector is a significant economic activity in the Biobío region and presents an opportunity for growth. This project aims to assess the technical and economic feasibility of replacing the use of a mobile crane at Aserradero El Colorado in Arauco. The issue arises from the need to optimize operational costs and considers the availability of stationary cranes after the closure of the Horcones II plant. The methodology involved several stages: first, a study of the current operations was conducted, focusing on analyzing failures in the feeding area. This analysis identified critical functions and existing solutions. Next, each process interruption was recorded in the field with precise timing, and the critical intervention zones within the sawmill were identified. Based on this information, a design was proposed that includes the installation of two stationary cranes in strategic locations, considering a technical analysis covering operational compatibility, crane reach, and space constraints. Additionally, a simulation model was developed in Flexsim to analyze production impacts under different operating scenarios, incorporating key variables such as the adjustment of feeder speed and the probability distribution of interruptions. The technical study results indicate that implementing stationary cranes is feasible, provided the feeder speed is adjusted to 21 logs per minute. The simulation showed that without this adjustment, production could decrease by up to 16%, leading to monthly losses of up to $300 million in scenarios with log diameters ranging from 14 to 20 cm. In contrast, optimizing the feeding speed maintains the same production level as the mobile crane, ensuring operational efficiency. From an economic perspective, the cost-benefit analysis revealed that the implementation of stationary cranes offers a Net Present Value (NPV) of $327,647,825, an Internal Rate of Return (IRR) of 108%, and a payback period of 11 months. In comparison, the present cost of maintaining the mobile crane over 25 years is significantly higher, reaching $1.011 billion, while the stationary crane option is estimated at $169 million in present value. This results in an 84% reduction in the Equivalent Annual Cost (EAC). Sensitivity analysis using Monte Carlo simulation confirms the project’s robustness, with an average NPV of $332 million and an average IRR of 110% under conservative scenarios. In conclusion, replacing the mobile crane with stationary cranes at El Colorado is not only technically and economically feasible but also a highly profitable solution that ensures long-term operational sustainability.
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