Study of the Hazard of Endogenous Fires in Coal Mines—A Chemometric Approach

Wojtacha‐Rychter, Karolina; Smoliński, Adam

doi:10.3390/en11113047

Cited by 10 publications

(3 citation statements)

References 23 publications

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“…Energies 2024, 17, x FOR PEER REVIEW 13 of 20 Further improvement of the aerodynamic characteristics of the two-flow air diffuser and the properties of air flow (velocity and temperature fields, velocity and temperature attenuation coefficients, and the influence of the angles of inclination of the twist blades) in terms of aerodynamic resistance and acoustic characteristics of aerodynamic noise, can be achieved as proposed in publication [65]. In order to confirm the effectiveness of the devices implemented to reduce energy consumption, it would be necessary to conduct additional experimental studies applying mathematical models [68][69][70][71] and numerical modelling methods as described in [72][73][74].…”

Section: Modernization Of Building Installationmentioning

confidence: 99%

A New Approach to the Economic Evaluation of Thermomodernization: Annual Assessment Based on the Example of Production Space

Voznyak,

Dudkiewicz,

Laska

et al. 2024

Energies

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Energy and economic assessments are of great relevance in the context of decision processes for the most optimal solutions for building renovations. Following the method recommended by UNIDO, economic analyses of thermal modernization options are carried out based on the Simple Payback Time (SPBT), Net Present Value Ratio (NPVR) and Internal Rate of Return (IRR) indices. Incorporating these indicators and a new approach that involves aggregating thermomodernization activities not only in the cold and warm seasons separately, but throughout the whole year, an economic evaluation of the thermomodernization of a production space was carried out. In this case study, the renovation options included wall insulation, window replacement, the installation of infrared heater, a two-flow air diffuser (TFAD) and variable air volume. The economic effect indicated by the highest NPVR over a normative period of 15 years was obtained for the installation of an infrared heater and a TFAD with a variable mode ventilation system. The SPBT for this case was also the lowest.

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Section: Modernization Of Building Installationmentioning

confidence: 99%

A New Approach to the Economic Evaluation of Thermomodernization: Annual Assessment Based on the Example of Production Space

Voznyak,

Dudkiewicz,

Laska

et al. 2024

Energies

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“…The use of non-fl ammable, safe electric infrared heaters in the ground structures of mines and on work areas will minimize the risks associated with increased fi re hazard of the coal industry [11,12].…”

Section: Introductionmentioning

confidence: 99%

Optimization of heating efficiency of buildings above underground coal mines by infrared heaters

Spodyniuk¹,

Voznyak²,

Savchenko³

et al. 2022

Nauk. visn. nat. hirn. univ.

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Purpose. To optimize the energy and economic efficiency of heating system of ground structures of coal mines with infrared heaters due to the rational choice of technical parameters of heating devices and their operating conditions, namely, the irradiation intensity of the floor q, thermal power of the heater Q, blackness degree of the floor surface and the height of installation H of infrared heaters. To achieve this goal, the task was to conduct theoretical and experimental studies on infrared heaters NL-12R of heating system of a building above underground coal mines during its thermal modernization. Methodology. At applying radiant heating systems, infrared heaters provide local heating of the working area of the buildings above underground coal mines. As a result, the necessary temperature conditions are maintained in the buildings above underground coal mines and there is a possibility of creating a local microclimate. A multifactorial experiment was performed taking into account the interaction of factors. The results of the study are presented in graphical and analytical forms. In addition, an analytical method was used to optimize parameters and operating conditions of the radiant heating system with infrared heaters NL-12R, and their number in the system of combined heating of buildings above underground coal mines is optimized. Findings. According to the experimental results, dependence of the relative floor temperature on the intensity of floor irradiation q, thermal power of the heater Q, blackness degree of the floor surface floor and the height H of infrared heaters location was determined. The results are presented in the form of graphs and nomograms, as well as approximated by their analytical equations. The annual economic effect of the optimal variant of combined heating system due to use the maximum number of infrared heaters NL-12R is 39.4 Euro/year provided that the installation of infrared heaters NL-12R with a power of Q = 1200 W in the number of 5 pcs. Originality. Optimization of energy and economic efficiency of heating system of buildings above underground coal mines by infrared heaters NL-12R, due to the rational choice of technical parameters of heating devices and conditions of their operation, was carried out by the analytical method. Practical value. Results of optimization of thermal and economic parameters of operation of the combined heating system of buildings above underground coal mines with installation of infrared heaters NL-12R with power Q = 1200 W proved the efficiency of combined heating of above-ground structures and the achievement of the annual economic effect of 39.4 Euro/year.

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“…Due to the complexity of coal pyrolysis products, thousands of compounds could be observed by GC×GC-TOFMS. Chemometrics, including hierarchical cluster analysis (HCA) and principal component analysis (PCA), , have been employed to determine the relationship between different coals and other various conditions based on the coal properties, proximate and ultimate analyses, trace elements based on ash composition, kinetics of coal pyrolysis, CO, , benzene, cresols, and long-chain aliphatic compounds. − Li et al and Yu et al , identified the molecular composition of coal extraction products with FT-ICR MS and Orbitrap MS and obtained in-depth statistical results for seven classes (CH, O, N, S, ON, OS, and NS) by HCA and PCA. However, correlations among the molecular composition of coal pyrolysis products, coal characteristics, and reaction conditions of coal hydropyrolysis have seldom been examined.…”

Section: Introductionmentioning

confidence: 99%

Application of Chemometrics for Coal Pyrolysis Products by Online py-GC×GC–MS

Yin

Liu

et al. 2021

ACS Omega

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Investigations on the molecular composition of coal pyrolysis products can help us to improve nonfuel utilization of coal. Meanwhile, the molecular composition of coal pyrolysis products is also influenced by the characteristics and depositional environment of coal. However, due to the extremely complex nature of coal, direct investigation of the molecular composition of coal pyrolysis products is still a challenge. In the present work, the data of the molecular composition of bituminous coal pyrolysis products are obtained by online pyrolysis coupled to comprehensive two-dimensional gas chromatography and mass spectrometry (online py-GC×GC−MS) and are divided into nine molecular groups depending on the aromaticity of the pyrolysis products and separating power of the GC×GC−MS. Chemometric tools, hierarchical cluster analysis, and principal component analysis are employed to reveal the correlations among the molecular composition of coal pyrolysis products and coal characteristics. The results show that the nine molecular groups of bituminous coal pyrolysis products can be divided into two clusters, the "aromatic group" and the "aliphatic group", and that the eight coals are divided into three clusters, all of which can be interpreted by the depositional environments and δ 13 C VPDB values of coals. Moreover, a simple and empirical equation for estimation of coal tar from hydropyrolysis can be obtained depending on the chemometric results of the molecular composition of the coal pyrolysis products. By application of chemometrics, the molecular composition of coal pyrolysis products can provide preference to industrial utilization of coal.

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Study of the Hazard of Endogenous Fires in Coal Mines—A Chemometric Approach

Cited by 10 publications

References 23 publications

A New Approach to the Economic Evaluation of Thermomodernization: Annual Assessment Based on the Example of Production Space

A New Approach to the Economic Evaluation of Thermomodernization: Annual Assessment Based on the Example of Production Space

Optimization of heating efficiency of buildings above underground coal mines by infrared heaters

Application of Chemometrics for Coal Pyrolysis Products by Online py-GC×GC–MS

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