SRPN: Coal (Topic)最新文献

{"title":"Evaluation of Gas Evolution Outside the Extraction Section at the Activation of Coal-Bearing Stratum Displacement","authors":"E. Filatieva, A. Oleinichenko, M. Filatiev","doi":"10.15587/2312-8372.2020.200219","DOIUrl":"https://doi.org/10.15587/2312-8372.2020.200219","url":null,"abstract":"The object of research is the processes of gas evolution from undermined sources within the exploited extraction section and beyond its boundaries under the influence of activation of rock displacement. To date, no quantitative dependencies have been established for gas evolution from the worked out (treatment workings) of the carbonaceous stratum when its movement is activated. Difficulties in studying gas evolution in the case under consideration lie in the need to carry out the necessary measurements of methane consumption in the workings and degassing wells of the mine field section and wing over the entire period of time working out the extraction column. The purity of the experiment is ensured by the operation of only one lava in the wing of the mine field. The ventilation scheme of the extraction section and the location of the measurement points in the mine workings make it possible to establish methane emission zones in the worked out space of the exploited and stopped lavas. The paper presents an analysis of the change, currently little studied, of gas evolution outside the exploited extraction section into the worked out space of stopped lavas. The main factors affecting the change in the level of gas evolution are determined, both within the extraction section and beyond its borders.The methodology of the experiments is assumed that the level of gas evolution from the undermined coal-bearing stratum is determined by coal mining and the degree of development of treatment works in the extraction section. On the basis of experimental data, the dependences of gas evolution on coal production and the degree of development of treatment works within the extraction section are established. Out of the extraction section, gas evolution from the worked out space of stopped lavas occurs when the development of the minefield wing is sufficiently developed and is determined by the intensity of coal mining in the exploited section. When the Earth's surface and the coal-bearing stratum are fully developed, the gas evolution from the mined-out space of the stopped lavas during the initial period of operation of the next lava can be several times higher than the methane emission within the existing extraction section.Studies have shown that the mechanism of the process of gas evolution within the extraction section and beyond its boundaries proceeds under the influence of various influencing factors.","PeriodicalId":216868,"journal":{"name":"SRPN: Coal (Topic)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124317598","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}

{"title":"Stranded Asset Risk and Political Uncertainty: The Impact of the Coal Phase-out on the German Coal Industry","authors":"Miriam Breitenstein, Carl-Philipp Anke, D. K. Nguyen, T. Walther","doi":"10.2139/ssrn.3604984","DOIUrl":"https://doi.org/10.2139/ssrn.3604984","url":null,"abstract":"We assess the value of stranded coal-fired power plants in Germany due to the critical phase- out by 2038. Within a Monte Carlo simulation, the scenarios under consideration (a slow decommissioning at the end of the technical lifetime in 2061, the highly probable phase-out by 2038, and an accelerated phase-out by 2030) are additionally assigned distributions to display the uncertainty of future developments. The results show an overall stranded asset value of €0.4 billion given the phase-out by 2038 and additional €14.3 billion if the phase-out is brought forward by eight years. This study also depicts the impacts of carbon pricing and the feed-in from renewable energy sources on the merit order and eventually the deterioration in economic conditions for hard coal and lignite power plants. Lastly, we illustrate immediate concerns for share prices of affected companies and contributes to closing the research gap between stranded physical and financial assets.","PeriodicalId":216868,"journal":{"name":"SRPN: Coal (Topic)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115339336","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}

{"title":"Predictive Maintenance Using Modified FMECA Method","authors":"N. Srivastava, S. Mondal","doi":"10.1504/ijpqm.2015.071521","DOIUrl":"https://doi.org/10.1504/ijpqm.2015.071521","url":null,"abstract":"This paper proposes a predictive maintenance policy using modified failure mode effect and criticality analysis (Mod-FMECA) technique. FMECA is used to identify failure modes, reasons, effects and criticality of the system (machine/plant) but in Mod-FMECA in addition to the analysis carried for FMECA, system performance in terms of output is measured and is used as an indicator to predict the failure mode of the system. The methodology so developed is validated using an example of coal pulverising mill. The proposed methodology helps in minimising the use of costly predictive maintenance equipments. However, further research on the proposed predictive maintenance policy may be carried out in order to extend its applicability to other industrial systems.","PeriodicalId":216868,"journal":{"name":"SRPN: Coal (Topic)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123545275","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}

{"title":"Request for the Formation of an Ad Hoc Committee on Coal and Oil Investments","authors":"Scott Bloomberg, A. Schaer","doi":"10.2139/ssrn.3647413","DOIUrl":"https://doi.org/10.2139/ssrn.3647413","url":null,"abstract":"This white paper argues that the University of Michigan's Board of Regents should form a committee to consider divesting the University’s endowment from coal and oil investments. The paper details the University's three-prong test – created by the school's prior divestments from companies doing business in apartheid South Africa and from tobacco companies – for determining whether to form a committee to consider divestment. The test requires: 1) a consensus on campus surrounding the issue; 2) that the activities of the particular industries must be antithetical to the University’s core values; and 3) that the subject industries must be uniquely responsible for the problem. <br><br>The white paper explains why coal and oil investments meet this standard. First, there is a consensus regarding climate change across all levels of campus. The Graham Sustainability Institute’s most recent survey found that around 89% of undergraduate students, 93% of graduate students, and 93% of faculty think that climate change is happening. The study found that a similar percentage believed humans are contributing to it, and that the issue is important to them personally. A consensus is further demonstrated by the educational and extra-curricular pursuits of students and the operational changes the University has made to reduce greenhouse gas emissions. Few significant issues, if any, enjoy this level of campus support.<br><br>Second, the activities of the coal and oil industries are antithetical to the University’s core values. In two ways this is true. These industries offend the University’s core values of sustainability and academic integrity. These were the crucial elements in the University’s choice to divest from tobacco companies in 2002.<br><br>And third, the coal and oil industries are uniquely responsible for climate change. The pollution from their industries is a chief driver of climate change, and their political and misinformation campaigns have undermined progress on this issue.","PeriodicalId":216868,"journal":{"name":"SRPN: Coal (Topic)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128387241","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}

{"title":"Directional Shadow Price Estimation of CO2, SO2 and NOx in the United States Coal Power Industry 1990–2010","authors":"Chia-Yen Lee","doi":"10.2139/ssrn.2250682","DOIUrl":"https://doi.org/10.2139/ssrn.2250682","url":null,"abstract":"Shadow prices, also termed marginal abatement costs, provide valuable guidelines to support environmental regulatory policies for CO2, SO2 and NOx, the key contributors to climate change. This paper complements the existing models and describes a directional marginal productivity (DMP) approach to estimate directional shadow prices (DSPs) which present substitutability among three emissions and are jointly estimated. We apply the method to a case study of CO2, SO2 and NOx produced by coal power plants operating between 1990 and 2010 in the United States. We find that DSP shows 1.1 times the maximal shadow prices estimated in the current literature. We conclude that estimating the shadow prices of each by-product separately may lead to an overestimation of the marginal productivity and an underestimation of the shadow prices.","PeriodicalId":216868,"journal":{"name":"SRPN: Coal (Topic)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122394255","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}