Chen C.,Guizhou Normal University |
Tang C.,Guizhou Wujiang Hydropower Development Ltd. |
Zhao Z.,Guizhou Normal University
Advanced Materials Research | Year: 2011
In order to find out the long-term deformation behavior of MgO concrete, the nearly 10 years prototype observation data of Dongfeng arch dam foundation is analyzed. The results show that the MgO concrete has excellent delayed micro-expansion character, and its long-term expansive deformation always tends to stable level without any trend to contraction or infinite expansion, and by adding appropriate MgO expanding agent which was calcined at some high temperature into concrete, the cracking resistance of the concrete is improved. It is an effective way to construct dams excellently, efficiently and economically by using MgO concrete technology.
Li L.,Hohai University |
Chen S.,Hohai University |
Dai J.,Guizhou Wujiang Hydropower Development Co. |
Zhu J.,Guizhou Wujiang Hydropower Development Co.
Shuili Fadian Xuebao/Journal of Hydroelectric Engineering | Year: 2013
Reservoir over-storage at the late stage of flood season is an effective approach to utilization of flood resources, and an analysis on the pattern of maximal flood occurring at this stage could give a theoretical support to the over-storage decision. For an event of a certain peak flood occurring with a given time period, we calculated its joint probability and the risk by using a Gumbel Archimedean Copula function for the joint distribution and assuming a Von Mises distribution for occurring time and a Pearson-III distribution for peak magnitude. We also calculated the shortest discharging time required to lower the level of over-storage back to the limited water level, and compared it with the flood-forecast lead time. Thus, the level of over-storage can be decided. An example is also presented to show the application of this method and its practical significance. © right.
Han H.-Y.,Huadian Electrical Power Research Institute |
Liu P.-Y.,Huadian Electrical Power Research Institute |
Li T.-C.,Guizhou Wujiang Hydropower Development Co. |
Ren X.-H.,Harbin Institute of Technology
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2014
The W-shaped flame boiler technology developed by Doosan Babcock Co. Ltd. makes it impossible to set up a separate regulation device to regulate the swirling intensity at the OFA spout forming an once-through flow inside and swirling flow outside due to the restriction of such factors as the structure of the boilers and the location of the air box and in such a case, a higher requirement is set for the design of the structure of the OFA spout. By utilizing the cold-state modeling test and the CFD numerical simulation software, the authors obtained the resistance and flow characteristics of the OFA spout, making the OFA to match with the thermal process of the boilers and realize the aim of enclosing the mainstream flue gases and securing the combustion efficiency. The application results show that when the inclusive angle of the blades and the axial line is 25° to 30°, the rotating momentum torque of the jet flow at the outlet of the OFA spout will attenuate relatively slow and the rotating kinetic energy can be effectively transferred to the furnace center, thus making the combustible substances and air thereto sufficiently mixed and ensuring a burn-out degree.
Sui X.,China Institute of Water Resources and Hydropower Research |
Wu S.-N.,China Institute of Water Resources and Hydropower Research |
Liao W.-G.,China Institute of Water Resources and Hydropower Research |
Jia L.,Guizhou Wujiang Hydropower Development Co. |
And 2 more authors.
Water Science and Engineering | Year: 2013
The effects of optimized operation principles implemented at reservoirs on the Wujiang River in southwest China between September 2009 and April 2010 under drought conditions were analyzed based on operational data collected from the Guizhou Wujiang Hydropower Development Co., Ltd. A set of linear regression equations was developed to identify the key factors impacting the electric power generation at reservoirs. A 59% reduction in the inflow discharge at the Hongjiadu Reservoir led to a decrease of only 38% in the total electric power generation at the Hongjiadu, Dongfeng, Suofengying, and Wujiangdu reservoirs on the Wujiang River, indicating that optimized operation can play an important role in drought management. The water level and the amount of other water inputs at the Hongjiadu Reservoir and the outflow discharge at all of the reservoirs except the Wujiangdu Reservoir were key factors affecting the total electric power generation at reservoirs on the Wujiang River under optimized operation. Copyright © 2013 Editorial Office of Water Science and Engineering.
Li Z.H.,Guizhou wujiang hydropower development Co.
Advanced Materials Research | Year: 2013
Considerable water saving and electricity can be attained by optimal regulation of cascade hydropower plants, equivalent to building large and medium-sized hydropower stations without increase in investment and immigration. Thus, the optimal regulation of cascade hydropower plants has great significance on increasing the consumption ratio of fossil energyand reducing atmospheric pollutants discharge. Taking Wujiang river basin as an example, mathematic models and rules of optimal regulation have been obtained in the research, Automation systems have been developed, forming an integrated work platform. Combining optimal regulation and generator control together, the platform helps to put scientific method into practice. Electricity 585 million kWh has been obtained through optimal regulation of Wujiang cascade hydropower stations per year on average, 162200 tons of coal can be saved annually,reduce coal burned by thermal power plants.about 474900 tons of Carbon dioxide, 3185 tons of Sulfur dioxide,3012 tons of nitrogen oxides can be reduced every year. © (2013) Trans Tech Publications, Switzerland.