Agency: European Commission | Branch: FP7 | Program: CP | Phase: ENERGY.2010.5&6.2-1 | Award Amount: 2.45M | Year: 2011
Coal mining and utilisation results in release of significant amounts methane and represent an important threat to the fight against climate change. Coal Mine Methane drainage processes can be set up to recover methane from the emissions during coal production. Methane can also be extracted from virgin coal seams trough primary and enhanced coalbed methane recovery. The main objective of the proposed research project is to contribute to the global GHG emissions reduction objective by addressing the key challenges facing the industry and emerging economies which also are major coal mining counties worlwide. This objective canbe expanded upon as follows: - to achieve significant improvements in methane drainage efficiency and purity in coal mines in the emerging economies of China and India, where methane drainage is employed with relatively low yields of gas and purity. - to develop a novel and effective gas drainage techniques for the ultra-thick seam and gassy mining operations in Europe - to investigate the benefits of implementing horizontal wells for coalbed methane (CBM) and coupling horizontal wells with the injection of CO2 and/or CO2 enriched flue gas to enhance methane recovery and CO2 storage - to disseminate the know-how developed across the coal sector internationally
Agency: European Commission | Branch: FP7 | Program: CP | Phase: ENERGY.2013.6.1.1 | Award Amount: 4.10M | Year: 2013
The main objective of the proposed project is to develop a generic UCG-CCS site characterisation workflow, and the accompanying technologies, which would address the dilemma faced by the proponents of reactor zone CO2 storage, and offer technological solutions to source sink mismatch issues that are likely to be faced in many coalfields. This objective will be achieved through integrated research into the field based technology knowledge gaps, such as cavity progression and geomechanics, potential groundwater contamination and subsidence impacts, together with research into process engineering solutions in order to assess the role/impact of site specific factors (coal type, depth/pressure, thickness, roof and floor rock strata, hydrology) and selected reagents on the operability of a given CO2 emission mitigation option in a coalfield. CO2 storage capacity on site for European and international UCG resources will be assessed and CO2 mitigation technologies based on end use of produced synthetic gas will be evaluated. The technology options identified will be evaluated with respect to local and full chain Life Cycle environmental impacts and costs. The project takes a radical and holistic approach to coupled UCG-CCS, and thus the site selection criteria for the coupled process, considering different end-uses of the produced synthetic gas, covering other options beyond power generation, and will evaluate novel approaches to UCG reagent use in order to optimise the whole process. This approach aims at minimising the need for on-site CO2 storage capacity as well as maximising the economic yield of UCG through value added end products, as well as power generation, depending on the local coalfield and geological conditions.
Li Z.,Henan Polytechnic University |
Thomas C.,University of Birmingham
Trends in Food Science and Technology | Year: 2014
Fresh fruits are very susceptible to mechanical damage during harvesting, packaging and transport, which can result in a substantial reduction in quality. Ideally, such damage would be minimized through improved understanding of the mechanisms. If damage occurs, economic losses might be minimized by grading affected fruits, based on the severity of damage, into those that need more than minimal further processing and those that do not. In either case, an objective and quantitative evaluation of the degree of mechanical damage is required. However, this is still far from being realized and remains an important challenge of past and proposed research in food safety.This review concerns the quantitative evaluation of mechanical damage to fresh fruits. Firstly, the sources of damage to fresh fruits during mechanical handling are summarized. The mechanisms are described in detail. Existing quantitative assessments characterizing surface and internal mechanical damage and its prediction are then reviewed. Finally, future research directions are discussed. The main challenge in evaluating mechanical damage to fresh fruit objectively is to develop a method to assess accurately the extent of internal damage to fruits caused by excessive external forces. © 2013 Elsevier Ltd.
You M.,Henan Polytechnic University
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2010
Six conventional triaxial strength criteria are studied based on test data of six rocks cited from public literatures. The least square method used to determine parameters in criteria may result in the deviation of fitting solution from main regular data for a few abnormal data; and the linear regression of equations transferred from criteria, such as Hoek-Brown criterion and Fairhurst criterion, may bring totally untrue outcome. The parameters should be searched directly according to the least absolute deviation. The Mohr criterion with the form of normal-shear stress does not describe the real physical phenomenon, in which the parameters are also difficult to be determined mathematically. The explicit criterion of principal stresses is the best choice for rock. The parabolic criterion with a single parameter, uniaxial compression strength, may fit test data of many rocks better than Coulomb criterion and Hoek-Brown criterion with two parameters. The exponential strength criterion with three parameters, which are determined on the least absolute deviation, will approximate to a great number of normal test data, and open out the abnormal data points. It can describe the relationship between strength and confining pressure in the entire experimental range better than that from the generalized Hoek-Brown criterion and quadratic polynomial criterion.
Jiangong Y.,Henan Polytechnic University
International Journal of Solids and Structures | Year: 2011
In this paper, viscoelastic shear horizontal (SH) wave propagation in functionally graded material (FGM) plates and laminated plates are investigated. The controlling differential equation in terms of displacements is deduced based on the Kelvin-Voigt viscoelastic theory. The SH wave characteristics is controlled by two elastic constants and their corresponding viscous coefficients. By the Legendre polynomial series method, the asymptotic solutions are obtained. In order to verify the validity of the method, a homogeneous plate is calculated to make a comparison with available data. Through three different graded plates, the influences of gradient shapes on dispersion and attenuation are discussed. The viscous effects on the displacement and stress shapes are illustrated. The different boundary conditions are analyzed. The influential factors of the viscous effect are analyzed. Finally, two multilayered (two layer and five layer) viscoelastic plates that are composed of the same material volume fraction are calculated to show their differences from the graded plate. © 2011 Elsevier Ltd. All rights reserved.
You M.,Henan Polytechnic University
International Journal of Rock Mechanics and Mining Sciences | Year: 2010
The minor principal stress is the key factor influencing the mechanical property of rock, and the strength criterion of conventional triaxial stresses is the basis of any true triaxial criterion. This paper examines the Coulomb criterion, Hoek-Brown criterion, the generalized Hoek-Brown criterion, and the exponential criterion proposed by the author. The procedure to determine the parameters in criteria is studied. Parameters in the generalized Hoek-Brown criterion are sensitive to the power n, thus Coulomb criterion with n=1.0 and the original form of Hoek-Brown criterion with n=0.5, especially that determined by linear regression, are not the best choice for the fitting solution of test data. The exponential criterion determined on the least absolute deviation will approximate a great number of normal test data, and expose the oddity data. It can describe the relation between strength and confining pressure in the entire stress range, with low misfit. The uniaxial compressive strengths predicted by the exponential criterion are nearly the same as the real magnitudes for all rocks. The deviator of strengths under conventional triaxial extension and compression is larger than half of the maximum strength increase from the intermediate principal stress. Therefore, the parameters in the exponential criterion may be completely determined from the strengths under conventional triaxial compression and extension. © 2009 Elsevier Ltd. All rights reserved.
Meng X.,Henan Polytechnic University |
Yang W.,Henan Polytechnic University
Astrophysical Journal | Year: 2010
Although the nature of the progenitor of Type Ia supernovae (SNe Ia) is still unclear, the single-degenerate (SD) channel for the progenitor is currently accepted, in which a carbon-oxygen white dwarf (CO WD) accretes hydrogen-rich material from its companion, increases its mass to the Chandrasekhar mass limit, and then explodes as an SNIa. The companion may be a main sequence or a slightly evolved star (WD + MS), or a red giant star (WD + RG). Incorporating the effect of mass stripping and accretion-disk instability on the evolution of the WD binary, we carried out binary stellar evolution calculations for more than 1600 close WD binaries. As a result, the initial parameter spaces for SNe Ia are presented in an orbital period-secondary mass (log P i, M i 2) plane. We confirmed that in a WD + MS system, the initial companion leading to SNe Ia may have mass from 1 M to 5 M. The initial WD mass for SNe Ia from WD + MS channel is as low as 0.565 M ⊙, while the lowest WD mass from the WD + RG channel is 1.0 M ⊙. Adopting the above results, we studied the birth rate of SNe Ia via a binary population synthesis approach. We found that the Galactic SNe Ia birth rate from SD model is (2.55-2.9) × 10-3 yr-1 (including WD + He star channel), which is slightly smaller than that from observation. If a single starburst is assumed, the distribution of the delay time of SNe Ia from the SD model may be a weak bimodality, where WD + He channel contributes to SNe Ia with delay time shorter than 108 yr and WD + RG channel to those with age longer than 6Gyr. © 2010 The American Astronomical Society.
Hu Y.,Henan Polytechnic University
Information Sciences | Year: 2014
In this article, we first introduce a class of binary operation called g-seminorm, which generalizes the concept of t-seminorm. Then we use the g-seminorm to define a class of Sugeno-like integral. Finally, we establish some new Chebyshev type inequalities for this kind of integral. © 2014 Elsevier Inc. All rights reserved.
Li D.,Henan Polytechnic University
Natural Hazards | Year: 2014
In response to the severe situation of coal mine gas disaster in China, a new method of reducing the danger of coal and gas outbursts and improving gas drainage and utilization in coal mines was introduced in this paper. The main idea of this method is to mining thin sub-layer as self-protective coal seam to eliminate or reduce the danger of coal and gas outburst. This method can be implemented by drills along seam and hydraulic jet when the mined seam with a relatively weak risk of coal and gas outbursts is soft or has a soft layer. This method was first applied in the Yian mine to verify its effectiveness. The results of application showed that mining thin sub-layer as self-protective coal seam can effectively eliminate the danger of coal and gas outburst and improve gas drainage and utilization. As this method needs less time and lower cost than conventional protective layer mining, it is of great significance for mining coal seam with the danger of coal and gas outburst. © 2013 Springer Science+Business Media Dordrecht.
Yang L.,Xi'an University of Architecture and Technology |
Yan H.,Xi'an University of Architecture and Technology |
Yan H.,Henan Polytechnic University |
Lam J.C.,City University of Hong Kong
Applied Energy | Year: 2014
Buildings account for about 40% of the global energy consumption and contribute over 30% of the CO2 emissions. A large proportion of this energy is used for thermal comfort in buildings. This paper reviews thermal comfort research work and discusses the implications for building energy efficiency. Predicted mean vote works well in air-conditioned spaces but not naturally ventilated buildings, whereas adaptive models tend to have a broader comfort temperature ranges. Higher indoor temperatures in summertime conditions would lead to less prevalence of cooling systems as well as less cooling requirements. Raising summer set point temperature has good energy saving potential, in that it can be applied to both new and existing buildings. Further research and development work conducive to a better understanding of thermal comfort and energy conservation in buildings have been identified and discussed. These include (i) social-economic and cultural studies in general and post-occupancy evaluation of the built environment and the corresponding energy use in particular, and (ii) consideration of future climate scenarios in the analysis of co- and tri-generation schemes for HVAC applications, fuel mix and the associated energy planning/distribution systems in response to the expected changes in heating and cooling requirements due to climate change. © 2013 Elsevier Ltd.