Results 171 to 180 of about 3,077,132 (240)

Non-uniformity of coal damage caused by liquid nitrogen freeze-thaw

Journal of Natural Gas Science and Engineering, 2019
: Liquid nitrogen freeze-thaw has been used in oil, shale gas, and coalbed methane exploitation as an efficient fracturing technology. To further reveal coal damage and cracking characteristics due to liquid nitrogen freeze-thaw, coal samples with ...
Jianping Wei, Lulu Zhang, Bo Li, Z. Wen
semanticscholar   +1 more source

Damage and Permeability Development in Coal During Unloading

Rock Mechanics and Rock Engineering, 2013
One of the key issues in protective seam mining is the pressure relief and permeability improvement effect. In this paper, the results of X-ray CT scanning experiments and permeability experiments using reconstituted coal specimens subjected to the same stress path and the same effective confining pressure (confining pressure minus pore pressure) are ...
Hai-Dong Chen, Cheng Yuan-Ping, Hong-Xing Zhou, Wei Li   +3 more
openaire   +1 more source

Damage to Coal Permeability During Hydraulic Fracturing

Low Permeability Reservoirs Symposium, 1991
ABSTRACT Coalbed methane wells are routinely fracture stimulated using gelled fluids and proppants. Surprisingly, there is no published report on the compatibility of the coals with fracturing fluids containing polymers, surfactants, biocides, friction reducers, and other chemicals.
R. Puri, G.E. King, I.D. Palmer
openaire   +1 more source

Mechanical properties and damage constitutive model of coal specimen with different moisture under uniaxial loading

International journal of damage mechanics, 2023
The moisture content has an important influence on the strength and stability of coal pillar dams in underground reservoirs. In this paper, the uniaxial compression test was performed on coal samples with three different moisture contents, to study the ...
Q. Xu, Qiang-ling Yao, Liqiang Yu, Liu Zhu, Zhaohui Chong, Y. Li, Xuehua Li   +6 more
semanticscholar   +1 more source

Damage Analysis for Coal Lance in Blast Furnace

Advanced Materials Research, 2011
Pulverized Coal Injection (PCI) is a key technology in modern ironmaking by blast furnace and the life of injection lance has a great influence on PCI operation and on normal running of blast furnace. It is found that the main reasons for the failure of the lances are their outer surface oxidation and the inner surface erosion through monitoring some ...
Wei Xiong, Jia Chao Chen, He Ming Shang
openaire   +1 more source

Impact of Gas Adsorption Induced Coal Matrix Damage on the Evolution of Coal Permeability

Rock Mechanics and Rock Engineering, 2013
It has been widely reported that coal permeability can change from reduction to enhancement due to gas adsorption even under the constant effective stress condition, which is apparently inconsistent with the classic theoretical solutions. This study addresses this inconsistency through explicit simulations of the dynamic interactions between coal ...
W. C. Zhu, C. H. Wei, J. Liu, T. Xu, D. Elsworth   +4 more
openaire   +1 more source

Damage mechanism of coal samples under the coupling effect of sulfate erosion and wet-dry cycles: Experiments, constitutive models, and numerical simulations

The Physics of Fluids
The coal pillar is a critical structural component of underground reservoir dams in coal mines. Prolonged cyclic storage and drainage of sulfate mine water can cause significant damage and degradation to these pillars.
Leiming Zhang, Min Wang, Bin Zhang, Xun Xi, Ying Zhang, Meifeng Cai, Jiliang Pan   +6 more
semanticscholar   +1 more source

Damage cost of the Dan River coal ash spill

Environmental Pollution, 2015
The recent coal ash spill on the Dan River in North Carolina, USA has caused several negative effects on the environment and the public. In this analysis, I report a monetized value for these effects after the first 6 months following the spill. The combined cost of ecological damage, recreational impacts, effects on human health and consumptive use ...
openaire   +2 more sources

Coal Conversion Will Increase Acid Rain Damage

BioScience, 1980
The acid rain dilemma is reviewed with US EPA plans for studying sensitive environmental areas. Global economic woes from the malady are predicted with the problem expected to worsen before improvement.
openaire   +1 more source

Cytogenetic damage in workers from a coal-fired power plant

Mutation Research/Genetic Toxicology and Environmental Mutagenesis, 2007
The aim of this study was to investigate the genotoxic risk to workers occupationally exposed to coal combustion products in Afsin-Elbistan A power plant, located in south-eastern Turkey. We analysed chromosomal aberrations (CAs), polyploidy, sister-chromatid exchanges (SCEs), and micronuclei (MN) in 48 male workers without a history of smoking ...
Yuzbasioglu, DENİZ, ÜNAL, FATMA, Celik, Mustafa, Donbak, Lale, Aksoy, Huseyin, Yilmaz, Serkan   +5 more
openaire   +3 more sources