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Chen Z.,Hydrochina Guiyang Engineering Corporation
Shuili Fadian Xuebao/Journal of Hydroelectric Engineering | Year: 2011

In this paper a mathematical analysis method is adopted to develop relationships between head, flow and output of turbine, and a function of turbine output is derived for the capacity expansion of Honglin hydropower on Maotiao river. Preliminary schemes were determined by the principle of output maximization, and then a comprehensive study on these schemes was conducted through an analysis of operation stability and an economic comparison. This work provides a reference for optimization design of capacity expansion and hydropower renovation. © Copyright. Source


Fu W.,University of Sichuan | Zheng X.,Hydrochina Guiyang Engineering Corporation | Lei X.,University of Sichuan | Deng J.,University of Sichuan
Particuology | Year: 2015

This work used a modified direct shear apparatus, created newly by the authors, to explore effects of the gap between shear box halves and specimen size on the shear resistance of coarse-grained soil. The shear boxes of this apparatus were assembled from a series of steel structures capable of superimposition and nesting. Such characteristics facilitated variation of specimen size in both diameter and height. The new device can also maintain a constant gap during shearing. We performed a series of gap-effect and size-effect tests for two uniformly graded, coarse-grained soil samples. The test results showed that both the gap space and specimen size had significant influences on shear resistance of the coarse-grained soil. Further, analysis of variations in shear strength indices led to a reasonable gap dimension and specimen size of the two soil samples. © 2015 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Source


Fu X.,Chinese Academy of science | Fu X.,University Paul Sabatier | Feng X.,Chinese Academy of science | Guo Y.,Hydrochina Guiyang Engineering Corporation | And 3 more authors.
Journal of Geophysical Research: Atmospheres | Year: 2013

Transformation and distribution of mercury (Hg) species play an important role in the biogeochemical cycling of mercury in aquatic systems. Measurements of water/air exchange fluxes of Hg, reactive mercury (RHg), and dissolved gaseous mercury (DGM) concentrations were conducted at 14 sites in five reservoirs on the Wujiang River, Guizhou, Southwest China. Clear spatial and temporal variations in Hg fluxes, RHg, and DGM concentrations were observed in the study area. Hg fluxes and RHg concentrations exhibited a consistent diurnal variation in the study area, with maximum fluxes and concentrations during daytime. A typical diurnal trend of DGM with elevated concentration at night was observed in a eutrophic reservoir with elevated bacteria abundance, suggesting a bacteria-induced production of DGM in this reservoir. For other reservoirs, a combination of sunlight-stimulated production and loss via photo-induced oxidation and evaporation regulated the diurnal trends of DGM. Seasonal variations with elevated Hg fluxes and RHg concentrations in warm season were noticeable in the study area, which highlighted the combined effect of interrelationships between Hg species in water and environmental parameters. Hg fluxes exhibited much more significant correlations with RHg and THg concentrations and air temperature compared to DGM concentrations and solar radiation. The measured fluxes were significantly higher than those simulated using the water/air thin film Hg0 gradient model. Aside from the potential limitations of dynamic flux chamber method, this may also suggest the thin film gas exchange model is not capable of predicting water/air Hg flux under low wind speed conditions. Additionally, it is speculated that DGM concentrations might vary significantly in surface waters with depth, and measurements of DGM at a depth of 2-4 cm below the water surface probably underestimated the DGM concentration that should be taken into account in simulations of water/air flux using the thin film gas exchange model. An empirical model of water/air Hg flux was developed, and the simulated fluxes were compared well with measurements. The model yields a mean annual Hg emission of 3.21.0 kg in the study area. © 2013. American Geophysical Union. All Rights Reserved. Source


Tang Q.,Leshan Normal University | Tang Q.,Nanyang Technological University | Lin S.,Hydrochina Guiyang Engineering Corporation | Cheng Y.,Leshan Normal University | And 2 more authors.
Biochemical Engineering Journal | Year: 2013

This work investigated the effect of ultrasound on the biodesulfurization of bunker oil by the native microbial cells in oil/water biphasic system. The operational parameters for the desulfurization procedure such as ultrasonic irradiation time, ultrasonic wave amplitude, biocatalyst initial concentration and ratio of oil phases to aqueous phases were studied. An obviously positive effect was observed after introduction of ultrasound into the BDS system. The sulfur content of bunker oil did not decrease in absence of ultrasound pre-treatment. After ultrasonic pre-treatment, about 10-20% of sulfur was removed for the samples without any additive and was dependent on ultrasonic irradiation time, ultrasonic wave amplitude, biocatalyst initial concentration and ratio of oil phases to aqueous phases. During the desulfurization, even though an easily available carbon source, glycerol, was supplied, some low molecular weight hydrocarbons can be consumed by cells as carbon source, resulting in a loss in the fuel value or energy loss. © 2013 Elsevier B.V. Source


Tang Q.,Leshan Normal University | Tang Q.,Nanyang Technological University | Lin S.,Nanyang Technological University | Lin S.,Hydrochina Guiyang Engineering Corporation | And 3 more authors.
Ultrasonics Sonochemistry | Year: 2013

This work investigated the ultrasonic assisted oxidative desulfurization of bunker-C oil with TBHP/MoO3 system. The operational parameters for the desulfurization procedure such as ultrasonic irradiation time, ultrasonic wave amplitude, catalyst initial concentration and oxidation agent initial concentration were studied. The experimental results show that the present oxidation system was very efficient for the desulfurization of bunker-C oil and ∼35% sulfur was removed which was dependent on operational parameters. The application of ultrasonic irradiation allowed sulfur removal in a shorter time. The stronger the solvent polarity is, the higher the sulfur removal rate, but the recovery rate of oil is lower. The sulfur compounds in bunker-C oil reacted with TBHP to produce corresponding sulfoxide, and further oxidation produced the corresponding sulfone. © 2013 Elsevier B.V. All rights reserved. Source

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