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Wang Y.,China University of Mining and Technology | Wang Q.,China HuaDian Electrical Research Institute | Fu X.,China University of Mining and Technology
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012

Two kinds of typical low-rank coal were burned in a drop tube furnace under different atmosphere. The produced particulate matters (PM) were collected by the cyclone and low pressure impactor (LPI). Transmission electron microscopy (TEM) and scanning electron microscope (SEM) were used to identify the morphology of the super-micron and submicron PM. SEM with an energy dispersive X-ray (SEM-EDX), TEM with an energy dispersive X-ray spectroscopy (TEM-EDS) and computer-controlled scanning electron microcopy (CCSEM) were applied to analyze the chemical composition in the ash. It has been confirmed that compared with air atmosphere, O2/CO2 atmosphere changes the generated fine ash particle size distribution and the concentration of the chemical composition, but the formation mechanisms are same for different atmosphere. For the case of the lignite with more amount of organic-associated minerals, O2/CO2 atmosphere increase the vaporization degree of Fe, Na/K sulfates, Al and Si, and thus increase the concentration of sub-micron particles. Also Fe is found to be a key element in the lignite. Oxy-fuel-combustion increases the attachment of vaporized Fe element to other particle. © 2012 China. Soc. for Elec. Eng.

Zhang N.-N.,China HuaDian Electrical Research Institute | Zhang N.-N.,Hohai University | Chen Z.-J.,Hohai University | Chen Y.-J.,Hohai University
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2012

Frequently monitoring data for the cable-tower anchorage zone of Sutong Bridge showed that in the various noises leading to data distortion, tall structures, such as, cable towers are obviously affected by temperature and backward-sunflower phenomena appear. In order to find the deformation of cable-tower caused by temperature and accurately evaluate the safety of cable-tower, combining the real-time meteorological date and the construction schedule, adopting the wavelet multi-scale denoising method at regular time intervals, the excursion of cable tower caused by temperature was extracted step by step. The deformation features of cable-tower anchorage zone brought by construction condition were extracted. Reliable calculation and analysis basis for mechanical behavior of anchorage zone and construction control were provided.

Wei Y.,Chubu University | Li H.,Anhui University of Science and Technology | Wang Q.,China HuaDian Electrical Research Institute | Honma K.,Taiheiyo Cement Corporation | And 2 more authors.
Fuel | Year: 2014

During coal gasification, the resulting slag varies in the mineral compositions and amount due to the ambient gas in gasifier. In this study, the microstructure and leaching behavior of typical slag were investigated under simulated mildly/strongly reducing gasification conditions with different H 2S concentration. XRF, XRD and SEM-EDX were used to study the properties of slag. And ICP-AES was used to determine the metallic ions in acid-digested slag samples. The results indicate that iron phase was separated from molten slag phase in melting process under a strongly reducing condition. In the strongly reducing condition with H2S, FeSx(x < 1) was formed below about 1200°C and it decomposed to iron liquid when the temperature is above about 1200°C while it takes a long time to reach equilibrium. In the strongly reducing condition, heavy metals, such as Cr, Cu, Ni, Co easily form an interstitial compound in iron phase. Adding of H 2S causes heavy metals enrichment in the iron phase, where it has a significant impact on Ni and Cu. On the other hand, addition of H2S has negligible effect on slag properties under mildly reducing condition. © 2013 Elsevier Ltd. All rights reserved.

Wang M.,Xian Jiaotong University | Wang J.,Xian Jiaotong University | Zhao Y.,China HuaDian Electrical Research Institute | Zhao P.,Xian Jiaotong University | Dai Y.,Xian Jiaotong University
Applied Thermal Engineering | Year: 2013

This paper presents a regenerative organic Rankine cycle (ORC) to utilize the solar energy over a low temperature range. Flat-plate solar collectors are used to collect the solar radiation for their low costs. A thermal storage system is employed to store the collected solar energy and provide continuous power output when solar radiation is insufficient. A daily average efficiency is defined to evaluate the system performance exactly instead of instantaneous efficiency. By establishing mathematical models to simulate the system under steady-state conditions, parametric analysis is conducted to examine the effects of some thermodynamic parameters on the system performance using different working fluids. The system is also optimized with the daily average efficiency as its objective function by means of genetic algorithm under the given conditions. The results indicate that under the actual constraints, increasing turbine inlet pressure and temperature or lowering the turbine back pressure could improve the system performance. The parametric optimization also implies that a higher turbine inlet temperature with saturated vapor state could obtain the better system performance. Compared with other working fluids, R245fa and R123 are the most suitable working fluids for the system due to their high system performance and low operation pressure. © 2012 Elsevier Ltd. All rights reserved.

Zhang D.,China Huadian Corporation | Wang J.,China HuaDian Electrical Research Institute | Fan W.,China HuaDian Electrical Research Institute | Wang L.,China HuaDian Electrical Research Institute
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2012

A midterm maximum peak load regulation model of hydropower stations is proposed from the perspective of coordinative operation of thermal and hydraulic power generation. The exponential penalty function is used to convert the minimax problem into the unconstrained programming problem to be solved directly, and the parallel computing advantage of multi-population genetic algorithm is integrated in the coarse-grained parallel genetic algorithm to increase the calculation efficiency and accuracy. The computative results for 8 hydropower stations in Wujiang river basin show that the proposed model mitigates the effect of system load change on the start-up and shut-down of thermal power plants while ensures the peak load regulation of hydropower stations. The coarse-grained parallel genetic algorithm improves the calculation efficiency significantly.

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