Mining Revue最新文献_第6页

Eco-Energetic Efficiency – Comparative Analysis of Steam Power Plants Versus Micro Hydropower Plants 生态能源效率——蒸汽发电厂与微型水力发电厂的比较分析

Mining Revue Pub Date : 2022-09-01 DOI: 10.2478/minrv-2022-0024

M. Delayat, M. Lazar, Sabin-Ioan Irimie, S. Irimie

{"title":"Eco-Energetic Efficiency – Comparative Analysis of Steam Power Plants Versus Micro Hydropower Plants","authors":"M. Delayat, M. Lazar, Sabin-Ioan Irimie, S. Irimie","doi":"10.2478/minrv-2022-0024","DOIUrl":"https://doi.org/10.2478/minrv-2022-0024","url":null,"abstract":"Abstract Global warming and climate changes, as well as the contribution of fossil fuel to the accentuation of these phenomena are realities almost unanimously accepted. Therefore, the reduction of the coal ratio in the energy mix and its replacement with forms of energy without emissions is being discussed more and more frequently. Nevertheless, it is important that the impact generated in the environment by the alternative energy sources related to energy production does not exceed the shortcomings created by the steam power plants, as it seems to be the case of micro hydropower plants (MHC) located on the superior flow of mountain rivers. As it is difficult to compare the impact on the environment generated by two completely different energy sources, two indictors were defined and used in this sense that consider their ecological, economic and social performance. As a result of the evaluation of the impact and of the comparison criteria, the two indicators were used in the two chosen case studies, resulting that a steam power plant that operates in cogeneration has a superior eco-energy efficiency to a micro hydropower plant. Thus, following the carried-out studies, we believe that MHC can be recommended only under special circumstances such as providing electric power to areas difficult to reach without them injecting the produced energy into the National Energy System (SEN).","PeriodicalId":18788,"journal":{"name":"Mining Revue","volume":"4 1","pages":"83 - 92"},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82035735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Geophysical Analyses on the Geomechanical Characteristics of the Soil for Choices of the Drilling Rig, in the Area of Târgu Ocna, Bacău County, Romania 罗马尼亚bacucu县t<s:1> rgu Ocna地区土壤地质力学特征的地球物理分析及钻机选型

Mining Revue Pub Date : 2022-09-01 DOI: 10.2478/minrv-2022-0020

Laurențiu-Ștefan Popescu, Adrian Ceptureanu

引用次数: 0

The Throttle Effect – Blower Fan Versus Exhaust Fan 节气门效应-鼓风机与排气扇

Mining Revue Pub Date : 2022-09-01 DOI: 10.2478/minrv-2022-0016

R. Hansen

{"title":"The Throttle Effect – Blower Fan Versus Exhaust Fan","authors":"R. Hansen","doi":"10.2478/minrv-2022-0016","DOIUrl":"https://doi.org/10.2478/minrv-2022-0016","url":null,"abstract":"Abstract One of the risks connected to fires underground is the throttle effect which may cause unforeseen smoke spread. This paper investigates the throttle effect for a blower fan and an exhaust fan case in a mine drift. The aim of the paper is to perform a parametric study on the throttle effect, varying influencing parameters such as the heat release rate and fan flow velocity. Data from fire experiments in a model-scale mine drift and results from CFD simulations were used during the study. It was found that the differences between the two fan cases were significant both in magnitude and occasionally in direction. For the base cases the throttle effect as well as the backlayering were more severe in the exhaust fan case. When increasing the heat release rate to 116 kW an increasing backlayering resulted, but the throttle effect was found to increase for the exhaust fan case and decrease for the blower fan case. The throttle effect decreased in the blower fan case as the gas density decrease levelled off, but the flow velocity increased even further, causing an increase in the downstream mass flow rate. This finding was confirmed by similar experimental results in model-scale mine drifts. The resulting mass flow rate induced by the fire plume changes was found to be higher than the externally imposed increase of the fan flow velocity. When increasing the distance between the fire and the exhaust fan, the backlayering increased and the throttle effect decreased.","PeriodicalId":18788,"journal":{"name":"Mining Revue","volume":"74 1","pages":"1 - 20"},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90601153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Determinations and Interpretations of the Contents of Heavy Metals from Food and Water Test Samples from Locations Near the Mining Perimeters of Baia Mare and Băiuț Area 巴亚马雷和布里尤普地区采矿周边地区食物和水样品重金属含量的测定和解释

Mining Revue Pub Date : 2022-06-01 DOI: 10.2478/minrv-2022-0009

A. Bud

引用次数: 0

New Challenges to the Deep Development of the Bulqiza Chrome Mines 布尔奇扎铬矿深度开发面临的新挑战

Mining Revue Pub Date : 2022-06-01 DOI: 10.2478/minrv-2022-0011

Edmond Goskolli

引用次数: 0

Finite Element Method for Designing Large Section Underground Works by Sequential Excavation Method. Study Case: Lugoj-Deva Road Tunnel 大断面地下工程序挖法设计的有限元法。研究案例:Lugoj-Deva公路隧道

Mining Revue Pub Date : 2022-06-01 DOI: 10.2478/minrv-2022-0008

M. Toderaș