China Huadian Engineering Co.

Beijing, China

China Huadian Engineering Co.

Beijing, China
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Liu C.,Beijing University of Chemical Technology | Wang W.,Beijing University of Chemical Technology | Anwar N.,Beijing University of Chemical Technology | Ma Z.,China Huadian Engineering Company Ltd | And 2 more authors.
Energy and Fuels | Year: 2017

This study investigated the effect of organic loading rate (OLR) on anaerobic digestion (AD) of food waste under mesophilic and thermophilic conditions. Results showed that the performance of the AD system was distinctly influenced by temperature and OLR in terms of biogas production, intermediate metabolism, and degradation performance. The optimal OLR under thermophilic condition was 2.5 g of volatile solids (VS)/L/day with methane yield (MY) of 541 mL/g of VSadded. In addition, the optimal OLR under mesophilic condition was 1.5 g of VS/L/day with a MY of 371 mL/g of VSadded. At the same OLR, the MY under thermophilic condition was 33-49% higher than that under mesophilic condition. Under thermophilic condition, steady methane production and degradation efficiency were achieved with considerably high OLR of 7.5 g of VS/L/day. Under mesophilic condition, stability was obtained only when the OLR was controlled below 2.5 g of VS/L/day. Results also revealed that food waste is a highly desirable substrate with a high bearing OLR under the thermophilic condition of biogas production. © 2017 American Chemical Society.

Chen X.-M.,China Huadian Engineering Co. | Feng X.-Q.,China Huadian Engineering Co. | Hu X.-C.,China Huadian Engineering Co.
IOP Conference Series: Earth and Environmental Science | Year: 2017

The zero adverse pressure gradient plate is taken as the study object, in order to study the leading edge separation vortex characteristics due to the inlet velocity shape. With the CFD method, we classify the study cases into 6 groups (h/δ = 0.1,0.2,0.5,1.0,1.5,2.0(h for vortex generator(VG) height, δ of inlet boundary layer thickness)) to study the inflow boundary layer's influence law to the vortex generator characteristics. Calculation results show that, vortex generator leading separation vortex strength is proportional to fluid average kinetic energy within vortex generator height range. Vortex strength shows essentially inverse relationship with the flow boundary layer thickness, while the vortex generator shape resistance also shows the inverse proportion to the flow boundary layer thickness. Namely, heavier flaw boundary layer thickness leads to lower vortex strength and lower vortex generator shape resistance simultaneously. © Published under licence by IOP Publishing Ltd.

Chen G.Q.,Peking University | Yang Q.,Peking University | Zhao Y.H.,China Huadian Engineering Co.
Renewable and Sustainable Energy Reviews | Year: 2011

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.

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 | Year: 2011

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.

Bao T.,Hohai University | Qin D.,Hohai University | Zhou X.,Jiangsu Province Water Resources Engineering Consulted Co. | Wu G.,China Huadian Engineering Co.
Science China Technological Sciences | Year: 2011

The abnormality monitoring model (AMM) of cracks in concrete dams is established through integrating safety monitoring theories with abnormality diagnosis methods of cracks. In addition, emphasis is placed on the influence of crack depth on crack mouth opening displacement (CMOD). A linear hypothesis is proposed for the propagation process of cracks in concrete based on the fictitious crack model (FCM). Abnormality points are detected through testing methods of dynamical structure mutation and statistical model mutation. The solution of AMM is transformed into a global optimization problem, which is solved by the particle swarm optimization (PSO) method. Therefore, the AMM of cracks in concrete dams is established and solved completely. In the end of the paper, the proposed model is validated by a typical crack at the 105 m elevation of a concrete gravity arch dam. © 2011 Science China Press and Springer-Verlag Berlin Heidelberg.

Jiang S.L.,China University of Geosciences | Jiang S.L.,China HuaDian Engineering Company | 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 | Year: 2014

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.

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 | Year: 2013

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.

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 | Year: 2010

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.

Cheng H.Y.,China Huadian Engineering CO. | Zhang Y.L.,Beijing Institute of Technology | Zhang X.,Beijing Institute of Technology | Shi Y.,Military Representative Office of Peoples Liberation Army Stationed in 618 factory
Advanced Materials Research | Year: 2014

With the development of the social and economy, China faces the increasingly serious energy crisis and more and more depends on energy imports. In this paper, the energy demand crisis is analyzed, and the status of the energy research and project status quo policy was discussed. At last, this paper gives the ways and means of the resolution of the crisis of energy demand, puts forward the sustainable energy development strategy, and builds the energy system and the relevant policies to alleviate the crisis of energy demand in China to a certain extent. Harmonious coexistence between mankind and nature is an eternal theme of economic and social development. Mankind is mainstay of social and economic development, while nature is the foundation upon which human beings' survival relies, therefore achieving the benign interaction between mankind and nature and preserving a good natural environment in support of social and economic development is our shared responsibility. However, over the past 50 years, along with rapid development of Chinese industrial economy, the energy issues, such as energy scarcity, low energy efficiency, outdated technology and consequential environmental pollution, have become increasingly salient and a huge barrier to the socioeconomic development. How to overcome the energy bottleneck, achieve energy sustainability, reasonable utilization of conventional energy sources and new energy development at the same time for the dual purpose of energy utilization and environmental protection and constantly promote technology research and development has become a focal issue of general concern to China. © (2014) Trans Tech Publications, Switzerland.

Zhang M.X.,Beijing Jiandu Design and Research Institute Co. | Zhang D.L.,China Huadian Engineering Co.
Applied Mechanics and Materials | Year: 2013

A new comprehensive evaluation based on triangular fuzzy number method is put forward in this paper, according to the principle of fuzzy comprehensive evaluation and using trichotomy to determine membership function. And a calculation example is illustrated by using the method presented. The method is a reference to the bid evaluation in the future. © (2013) Trans Tech Publications, Switzerland.

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