Effect of the Heat Transfer Surface on Prevention of Spontaneous Combustion of Coal

Wicaksono, Ricky Putro Satrio; Fathia, Sofi Hesti; Kolang, Inkasandra Faranisa; Riadi, Achmad; Nirbito, Wahyu; Muharam, Yuswan; Nugroho, Yulianto Sulistyo

doi:10.14716/ijtech.v10i6.3620

Cited by 4 publications

(3 citation statements)

References 1 publication

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“…Briefly, the theory's central idea is the study of systems from a sequence of pairwise comparisons. It allows you to generate weights for each evaluation criterion based on paired comparisons provided by the experts/judges of these criteria (Kadoi, Re-ep, and Divjak, 2017;Thomas and Vargas, 2006). In its initial formulation, AHP assumes four hypotheses (reciprocity, homogeneity, hierarchies and systems with dependencies, and expectations) and uses a hierarchy as a structure to model the problem, in which the elements of a level did not depend on the descendants or the criteria of the same level.…”

Section: Methodology Applying the Ahp Multicriteria Methodsmentioning

confidence: 99%

Thermal and Hydrodynamic Performance Analysis of a Shell and Tube Heat Exchanger Using the AHP Multicriteria Method

Ravelo-Mendivelso,

Villate-Fonseca,

Hernández-Vásquez

et al. 2023

IJTech

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The goal of this work is to identify the best alternatives that allow for improving the thermal efficiency of a shell and tube heat exchanger in real operating conditions. The main motivation for carrying out the research is based on the need identified, together with the oil, natural gas, and alternative energy industry, to analyze and learn about the main criteria that directly impact the thermal efficiency of a heat exchanger. The applied methodology was based on the AHP (Analytic Hierarchy Process) multicriteria method. Three relevant criteria were identified: Thermodynamic, Hydrodynamic, and Economic. Additionally, a complete analysis of 9 sub-criteria (i.e. energy and exergetic analysis of the process, analysis of the thermodynamic properties of the fluids; pressure drop, volumetric flow of hot and cold fluids; energy costs, maintenance, operation and geometry of the heat exchanger) allowed us to conclude that the best strategy to increase the thermal efficiency of a heat exchanger in real operating conditions consists of using innovative online cleaning prototypes that use abrasive spheres. This will allow the heat exchanger to be cleaned simultaneously with its operation, reducing downtime and maintenance times/costs.

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Section: Methodology Applying the Ahp Multicriteria Methodsmentioning

confidence: 99%

Thermal and Hydrodynamic Performance Analysis of a Shell and Tube Heat Exchanger Using the AHP Multicriteria Method

Ravelo-Mendivelso,

Villate-Fonseca,

Hernández-Vásquez

et al. 2023

IJTech

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“…In addition to the value of h observation, Table (2) also shows that the temperature of the material in the reboiler during the distillation process with each experimental variation varied. In all the concentrations, the temperature of the material increased with an increasing tube reboiler diameter; according to (Wicaksono et al, 2019) the temperature inside the heat exchanger increased with increasing heat exchanger surface area. However, the temperature difference in this study was not significant because the distillation equipment was set up at the same temperature.…”

mentioning

confidence: 90%

Heat Transfer Characteristics in Vertical Tubular Baffle Internal Reboiler through Dimensional Analysis

Susmiati¹,

Purwantana²,

Bintoro³

et al. 2022

IJTech

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Heat transfer in shell and tube heat exchangers is in general described in terms of the relationships of Nuselt, Prandtl, and Reynold dimensionless numbers. One of the parameters of heat exchanger performance is convective heat transfer coefficient (h), and mathematical model can predict it. This study aimed to find out the relationship of the parameters that affected the performance of vertical tubular baffle internal reboiler during ethanol distillation. The mathematical model was developed by a dimensional analysis with the π-Buckingham method. Several influencing parameters during the distillation process were identified to develop a mathematical model. The study was carried out on the distillation process of low-concentration ethanol, i.e., 10%, 20%, 30% using internal reboilers with different tube sizes, i.e., diameters of 1.27 cm, 2.54 cm, 3.81 cm and height of 4 cm, 6 cm, 8 cm, to obtain the value of h observation. Based on the results of the study, a heat transfer model was obtained, i.e., 𝑵𝒖 = 𝟏𝟒𝟓𝟐. 𝟐𝟗 𝑹𝒆 𝟎.𝟑𝟓𝟕 ( 𝑫 𝑳

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“…One method currently being developed to control the coal temperature is by immersing the heat exchanger in a coal pile [7][8][9]. Another study also found that the immersed heat exchanger will not disrupt the pile's loading capacity both in storage and trans-shipping processes [10].…”

Section: Introductionmentioning

confidence: 99%

Modeling on the Effect of Heat Exchanger Submersion on Controlling Spontaneous Combustion in A Coal Pile

Thabari

Supit

Nirbito

et al. 2021

ARFMTS

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Spontaneous combustion of coal has been well-known as a problem faced by coal industries, especially in storing and trans-shipping processes. The negative impacts of this phenomenon have led to several hazardous incidents and degrading product quality. Several methods have been researched to minimize the impacts; one of the proposed ways is immersing heat exchangers inside the coal stockpile. An experiment was conducted to analyze the cooling effect of an immersed simple heat exchanger made of a copper coil. By varying the number of windings, the experiment showed a significant decrease in pile temperature due to the immersed heat exchanger. This work continues exploring the possibility of applying the method by observing and analyzing the simulation model. COMSOL Multiphysics was used to model the physics phenomena that occur within the coal reactor. The effect of the heat exchanger surface area was studied from the model to observe the heat propagation within the coal reactor. The vast reach of heat propagation from the heat exchanger through the coal pile on the simulation was promisingly showing that this method was useful to limit the occurrence of spontaneous fire in coal piles.

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Effect of the Heat Transfer Surface on Prevention of Spontaneous Combustion of Coal

Cited by 4 publications

References 1 publication

Thermal and Hydrodynamic Performance Analysis of a Shell and Tube Heat Exchanger Using the AHP Multicriteria Method

Thermal and Hydrodynamic Performance Analysis of a Shell and Tube Heat Exchanger Using the AHP Multicriteria Method

Heat Transfer Characteristics in Vertical Tubular Baffle Internal Reboiler through Dimensional Analysis

Modeling on the Effect of Heat Exchanger Submersion on Controlling Spontaneous Combustion in A Coal Pile

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