Mining engineering最新文献_第3页

Electromagnetic interference from personal dust monitors and other electronic devices with proximity detection systems. 来自个人灰尘监测器和其他带有接近探测系统的电子设备的电磁干扰。

Mining engineering Pub Date : 2018-05-01 DOI: 10.19150/me.8237

J Noll, R J Matetic, J Li, C Zhou, J DuCarme, M Reyes, J Srednicki

{"title":"Electromagnetic interference from personal dust monitors and other electronic devices with proximity detection systems.","authors":"J Noll, R J Matetic, J Li, C Zhou, J DuCarme, M Reyes, J Srednicki","doi":"10.19150/me.8237","DOIUrl":"10.19150/me.8237","url":null,"abstract":"In April 2016, the U.S. Mine Safety and Health Administration (MSHA) began requiring the use of continuous personal dust monitors to monitor and measure respirable mine dust exposures to underground coal miners. Mines are currently using the PDM3700 personal dust monitor to comply with this regulation. After the PDM3700's implementation, mine operators discovered that it interfered with proximity detection systems, thus exposing miners to potential striking and pinning hazards from continuous mining machines. Besides the PDM3700, other electronic devices were also previously reported to interfere with proximity detection systems. MSHA sought the aid of the U.S. National Institute for Occupational Safety and Health (NIOSH) and mining industry stakeholders to determine how the PDM3700 and some other electronic devices and proximity detection systems interact with each other. Accordingly, NIOSH investigated existing standards, developed test protocols, designed experiments and conducted laboratory evaluations. Some interferences were observed to be caused by electromagnetic interference from some electronic devices, including the PDM3700. Results showed that there was no significant interference when the PDM3700, as well as other electronic devices, and the miner-wearable component of the proximity detection system were separated by distances of 15 cm (6 in.) or greater. In the present study, it was found that the PDM3700 and the personal alarm device needed to be at least 15 cm (6 in.) apart in order for them to be used simultaneously and reduce potential interference.","PeriodicalId":91142,"journal":{"name":"Mining engineering","volume":"70 5","pages":"61-68"},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6108086/pdf/nihms-983795.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"36431143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Use of subsidence to estimate secondary extraction of trona 利用沉降估算天然气的二次提取

Mining engineering Pub Date : 2018-04-01 DOI: 10.19150/ME.8194

N. West, P. Conrad, R. Kramer, C. Todd

引用次数: 0

Text mining analysis of U.S. Department of Labor’s MSHA fatal accident reports for coal mining 美国劳工部MSHA煤矿致命事故报告的文本挖掘分析

Mining engineering Pub Date : 2018-04-01 DOI: 10.19150/me.8195

E. Tarshizi, M. Buche, B. Inti, R. Chappidi

引用次数: 1

Three-dimensional slope stability analysis of block sliding slope failure at the Pikeview Quarry, El Paso County, Colorado 科罗拉多州埃尔帕索县Pikeview采石场块体滑坡破坏的三维边坡稳定性分析

Mining engineering Pub Date : 2018-03-01 DOI: 10.19150/me.8135

J. Varnier, J. Cremeens, D. D. Overton

引用次数: 1

Refuge alternatives relief valve testing and design with updated test stand. 避难所替代安全阀测试和设计，具有更新的测试台。

Mining engineering Pub Date : 2018-03-01 DOI: 10.19150/me.8136

T J Lutz, P T Bissert, G T Homce, J A Yonkey

{"title":"Refuge alternatives relief valve testing and design with updated test stand.","authors":"T J Lutz, P T Bissert, G T Homce, J A Yonkey","doi":"10.19150/me.8136","DOIUrl":"10.19150/me.8136","url":null,"abstract":"Underground refuge alternatives require an air source to supply breathable air to the occupants. This requires pressure relief valves to prevent unsafe pressures from building up within the refuge alternative. The U.S. Mine Safety and Health Administration (MSHA) mandates that pressure relief valves prevent pressure from exceeding 1.25 kPa (0.18 psi), or as specified by the manufacturer, above mine atmospheric pressure when a fan or compressor is used for the air supply. The U.S. National Institute for Occupational Safety and Health (NIOSH) tested a variety of pressure relief valves using an instrumented test fixture consisting of data acquisition equipment, a centrifugal blower, ductwork and various sensors to determine if the subject pressure relief valves meet the MSHA requirement. Relief pressures and flow characteristics, including opening pressure and flow rate, were measured for five different pressure relief valves under a variety of conditions. The subject pressure relief valves included two off-the-shelf modified check valves, two check valves used in MSHA-approved built-in-place refuge alternatives, and a commercially available valve that was designed for a steel refuge alternative and is currently being used in some built-in-place refuge alternatives. The test results showed relief pressures ranging from 0.20 to 1.53 kPa (0.03 to 0.22 psi) and flow rates up to 19.3 m3/min (683 scfm). As tested, some of the pressure relief valves did not meet the 1.25 kPa (0.18 psi) relief specification.","PeriodicalId":91142,"journal":{"name":"Mining engineering","volume":"70 3","pages":"46-50"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5858559/pdf/nihms948925.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35934578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mineworker fatigue: A review of what we know and future decisions. 矿工疲劳：回顾我们所知道的和未来的决定。

Mining engineering Pub Date : 2018-03-01

Tim Bauerle, Zoë Dugdale, Gerald Poplin

引用次数: 0

Development, testing and proposed application of multiple passive source tracers for underground mine ventilation systems 用于井下通风系统的多无源源示踪剂的开发、测试和拟议应用

Mining engineering Pub Date : 2018-02-01 DOI: 10.19150/ME.8059

E. Watkins, K. Luxbacher, E. Jong

引用次数: 1

A survey of atmospheric monitoring systems in U.S. underground coal mines. 美国地下煤矿大气监测系统调查。

Mining engineering Pub Date : 2018-02-01 DOI: 10.19150/me.8058

J H Rowland, S P Harteis, L Yuan

引用次数: 0

Open-air sprays for capturing and controlling airborne float coal dust on longwall faces. 用于捕获和控制长壁工作面悬浮煤尘的露天喷雾器。

Mining engineering Pub Date : 2018-01-01 DOI: 10.19150/me.7978

T W Beck, C E Seaman, M R Shahan, S E Mischler

{"title":"Open-air sprays for capturing and controlling airborne float coal dust on longwall faces.","authors":"T W Beck, C E Seaman, M R Shahan, S E Mischler","doi":"10.19150/me.7978","DOIUrl":"10.19150/me.7978","url":null,"abstract":"Float dust deposits in coal mine return airways pose a risk in the event of a methane ignition. Controlling airborne dust prior to deposition in the return would make current rock dusting practices more effective and reduce the risk of coal-dust-fueled explosions. The goal of this U.S. National Institute for Occupational Safety and Health study is to determine the potential of open-air water sprays to reduce concentrations of airborne float coal dust, smaller than 75 µm in diameter, in longwall face airstreams. This study evaluated unconfined water sprays in a featureless tunnel ventilated at a typical longwall face velocity of 3.6 m/s (700 fpm). Experiments were conducted for two nozzle orientations and two water pressures for hollow cone, full cone, flat fan, air atomizing and hydraulic atomizing spray nozzles. Gravimetric samples show that airborne float dust removal efficiencies averaged 19.6 percent for all sprays under all conditions. The results indicate that the preferred spray nozzle should be operated at high fluid pressures to produce smaller droplets and move more air. These findings agree with past respirable dust control research, providing guidance on spray selection and spray array design in ongoing efforts to control airborne float dust over the entire longwall ventilated opening.","PeriodicalId":91142,"journal":{"name":"Mining engineering","volume":"70 1","pages":"42-48"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5769954/pdf/nihms932616.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35749468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Foam property tests to evaluate the potential for longwall shield dust control. 泡沫性能试验评价长壁屏蔽防尘的潜力。

Mining engineering Pub Date : 2018-01-01 DOI: 10.19150/me.7977

W R Reed, T W Beck, Y Zheng, S Klima, J Driscoll

{"title":"Foam property tests to evaluate the potential for longwall shield dust control.","authors":"W R Reed, T W Beck, Y Zheng, S Klima, J Driscoll","doi":"10.19150/me.7977","DOIUrl":"10.19150/me.7977","url":null,"abstract":"Tests were conducted to determine properties of four foam agents for their potential use in longwall mining dust control. Foam has been tried in underground mining in the past for dust control and is currently being reconsidered for use in underground coal longwall operations in order to help those operations comply with the Mine Safety and Health Administration's lower coal mine respirable dust standard of 1.5 mg/m3. Foams were generated using two different methods. One method used compressed air and water pressure to generate foam, while the other method used low-pressure air generated by a blower and water pressure using a foam generator developed by the U.S. National Institute for Occupational Safety and Health. Foam property tests, consisting of a foam expansion ratio test and a water drainage test, were conducted to classify foams. Compressed-air-generated foams tended to have low expansion ratios, from 10 to 19, with high water drainage. Blower-air-generated foams had higher foam expansion ratios, from 30 to 60, with lower water drainage. Foams produced within these ranges of expansion ratios are stable and potentially suitable for dust control. The test results eliminated two foam agents for future testing because they had poor expansion ratios. The remaining two foam agents seem to have properties adequate for dust control. These material property tests can be used to classify foams for their potential use in longwall mining dust control.","PeriodicalId":91142,"journal":{"name":"Mining engineering","volume":"70 1","pages":"35-41"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5798484/pdf/nihms932627.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35807708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0