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Jiang S.L.,China University of Geosciences | Jiang S.L.,China Huadian Engineering Co. | Zeng C.L.,Chongqing Institute of Geology and Mineral Resources | Wang S.X.,Chongqing Institute of Geology and Mineral Resources | Li M.,Shandong Shengli Vocational College
Advanced Materials Research

In order to carry out a more comprehensive discussion on shale gas accumulation conditions of Lower Cambrian Shuijingtuo Formation and Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation, the distribution, source rock conditions and reservoir conditions of these two shales are comprehensively analyzed, these two shales are both have the characteristics of high organic carbon content, high maturity, appropriate thickness and mainly type I kerogen as source rocks, and interbedded with siltstone and/or fine sandstone, rich in quartz and other detrital components, easy to break and form the cracks, micro cracks as reservoirs, these characteristics provide a favorable material basis and reservoir space for shale gas accumulating. On this basis, the effective distribution areas of these two shales are further determined and shale gas resources are preliminary evaluated, eventually come to the results of shale gas resources of Lower Cambrian Shuijingtuo Formation and Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation respectively are 0.409×1012m3 and 0.389×1012m3. © (2014) Trans Tech Publications, Switzerland. Source

Chen G.Q.,Peking University | Yang Q.,Peking University | Zhao Y.H.,China Huadian Engineering Co. | Wang Z.F.,CAS Institute of Electrical Engineering
Renewable and Sustainable Energy Reviews

It is commonly assumed that renewable energy based systems have the potential to mitigate greenhouse gas emissions and save fossil energy from the grid. Nevertheless, any energy conversion systems need extra energy to deliver energy into society. It is necessary to estimate the total direct and indirect fossil energy cost and associated greenhouse gas emissions by any system over its entire life cycle. For the first MW class solar tower power plant in China, nonrenewable energy cost and greenhouse gas emissions are accounted respectively as 0.95 MJ/MJ and 0.04 kg CO2-eq/MJ during its expected 20 years of operating life, corresponding to a net nonrenewable energy saving of 3.92E+08 GJ and greenhouse gas emission mitigation of 4.17E+04 tonne CO2-eq compared to conventional thermal power systems in China. © 2010 Elsevier Ltd. All rights reserved. Source

Chen G.Q.,Peking University | Yang Q.,Peking University | Zhao Y.H.,China Huadian Engineering Co.
Renewable and Sustainable Energy Reviews

The high degree of renewability of wind power in China is illustrated by a case study of nonrenewable energy cost and greenhouse gas emission to a typical wind farm in Guangxi. The account for the life cycle of components manufacturing and transportation, installation, operation, maintenance, disassembly and disposal is based on the embodiment intensities of nonrenewable energy use and greenhouse gas emission by an environmental extended input-output analysis for typical commodities in the Chinese economy. The nonrenewable energy cost and greenhouse gas emissions are estimated, respectively, as 0.047 MJ and 0.002 kg CO2-eq for 1 MJ of electricity by the wind farm plant, respectively 56 and 108 times less than those of the average coal plant in China. Considering the dominance of coal power, the nonrenewable energy saving is estimated at 1.22E+10 MJ during its 20 years operating period, while the reduced greenhouse gas emissions are 1.03E+09 kg CO2-eq by the wind farm studied. Compared with the study of the wind farms worldwide, the nonrenewable energy cost intensity of Chinese 1.25 MW wind turbines is in the median range, and the GHG emission intensity is at the lower end of the scale. The concrete results have essential policy making implications supportive to a further spread of wind power technology in China. © 2011 Elsevier Ltd. All rights reserved. Source

Li Z.-F.,China Huadian Engineering Co. | Li Z.-F.,China University of Geosciences | Li Z.-P.,China University of Geosciences | Miao L.-L.,China University of Geosciences | And 3 more authors.
Natural Gas Geoscience

Shale gas reservoir pore is very small. Pore radius of domestic and foreign shale mainly concentrates from several nm to twenty nm, and a part of domestic shale pore radius is less than 10nm. There are two main gas sources which are free gas in nano-pore and dissolved gas in kerogen, yielding four mechanisms during production. By researching the four mechanisms which are Knudsen diffusion, gas slippage, Darcy Law and dissolved gas diffusion in kerogen, a cylindrical tube and unidirectional steady seepage flow mathematical model is built to study shale gas permeability and pore pressure. The results show that apparent permeability is much larger than Darcy permeability. The smaller pore diameter is, the larger ratio of the two permeability will be. The ratio will increase by 1 to 2 orders of magnitude while the pore diameter varies from twenty nm to several nm. The smaller the pressure is, the larger the ratio will be. The apparent permeability is also one to two orders greater than Darcy permeability while the pressure lies below 5 MPa. The transient pressure is nonlinear distribution from supply edge to the discharge in nano-pore mainly because Knudsen diffusion in nano-pore gets stronger and depletes more pressure under lower pressure. Diffusion in kerogen has a weak effect on pressure depletion because of such low diffusion flux. Source

Liu Q.,CAS Institute of Engineering Thermophysics | Wang Y.,CAS Institute of Engineering Thermophysics | Wang Y.,University of Chinese Academy of Sciences | Gao Z.,CAS Institute of Engineering Thermophysics | And 4 more authors.
Science China Technological Sciences

Developing solar thermal power technology in an effective manner is a great challenge in China. In this paper an experiment platform of a parabolic trough solar collector system (PTCS) was developed for thermal power generation, and the performance of the PTCS was experimentally investigated with synthetic oil as the circulate heat transfer fluid (HTF). The solar collector's efficiency with the variation of the solar flux and the flow rate of the HTF was identified. The collector efficiency of the PTCS can be in the range of 40%-60%. It was also found that there existed a specified delay for the temperature of the HTF to response to the solar flux, which played a significant role in designing the PTCS. The heat loss effect on collector efficiency was also studied, which was about 220 W/m for the receiver with a 180°C temperature difference between the collector temperature and the ambient temperature, amounting to about 10% of the total solar energy incident on the collector. The encouraging results can provide fundamental data for developing the parabolic trough solar thermal power plant in China. © 2010 Science in China Press and Springer Berlin Heidelberg. Source

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