Liu P.S.,Beijing Normal University |
Du H.Y.,Beijing Normal University |
Du H.Y.,Jilin Electric Power Research Institute
Materials and Design | Year: 2011
Three dimensional reticulated porous metal foams are widely used engineering materials. A failure model with the simplified structure of these porous materials has been established, and the failure modes have been analyzed for the corresponding porous components under several typical loads, which include torsion, shearing and bending. The failure modes cover the tensile fracture, the shearing and the buckling of the strut, which may lead to the final destruction of the whole porous structure. The mathematical relationships, which characterize different failure modes, have been derived for the strut failure resulting from loading for these porous components under the above loading conditions. The results also show that the failure mode is related with the material species for these materials under the above loads. The tensile fracture of the strut will occur for the porous body with metallic materials in most cases, and the shearing fracture of the strut may occur for that in a relatively little cases. Moreover, the elastic buckling, the elastic-plastic buckling and the edge yielding may also occur on the strut of porous bodies when certain conditions are met. © 2011.
Liu P.S.,Beijing Normal University |
Du H.Y.,Beijing Normal University |
Du H.Y.,Jilin Electric Power Research Institute |
Xia F.J.,Beijing Normal University
Materials and Design | Year: 2013
A porous anatase TiO2 (titanium dioxide) film with sub-micropores, which displays a good photocatalysis, was successfully fabricated using a multiple technique of sol-gel and ion bombarding, and the formation mechanism is analyzed for these pores. Firstly a clean substrate was coated with a sol of the precursor of titanium dioxide and subsequently sintered to yield a dense TiO2 film, then bombarded by the metal ion to form a porous film with a number of sub-micropores. These pores effectively expand the available active room of the film for liquid mediums and the results are of considerable significance to potential applications of the titanium dioxide film for catalysis. The experimental results of the photocatalytic decomposition of a methyl orange solution show that the photocatalytic effect of this dense film under ultraviolet light is distinctly better than that of the dense TiO2 film prepared by the conventional sol-gel method. Linearly fitting the curves of relation between the absorbance of methyl orange solution and the time of photocatalysis indicates that the catalytic reaction velocity constants are closely 4.8×10-3min-1 for the porous film and 1.2×10-3min-1 for the dense film under ultraviolet light, respectively. © 2013.
Lin H.,Jilin Electric Power Research Institute |
Sun W.,Jilin University |
Zhao C.,Jilin University |
Na H.,Jilin University
Journal of Polymer Research | Year: 2013
Membranes of sulfonated poly (arylene ether ketone) containing carboxyl groups (SPAEK-C) are modified by alternating deposition of oppositely charged polyelectrolytes [carboxyl-functionalized multiwalled carbon nanotubes (C-MWCNTs) and chitosan (CS)] in order to reduce methanol crossover and maintain high proton conductivity in a direct methanol fuel cell (DMFC). Fourier transform infrared spectroscopy confirms that C-MWCNTs and CS are assembled in the multilayers. The morphology of membranes is studied by scanning electron microscopy. The results confirm the presence of thin C-MWCNTs/CS multilayers coated on the SPAEK-C membrane. The SPAEK-C-(C-MWCNTs/CS)n membranes maintain high proton conductivity values up to 0.058 Scm-1 at 25 °C and 0.24 Scm-1 at 80 °C, which are superior to previous layer-by-layer assembled polyelectrolyte systems. Meanwhile, the methanol permeability of these modified membranes is effectively reduced. The selectivity of SPAEK-C-(C-MWCNTs/CS)n is two orders of magnitude greater than that of Nafion® 117, making these modified membranes a good alternative to be used in DMFCs. The thermal stability, water uptake, swelling ratio and proton conductivity of SPAEK-C and SPAEK-C-(C-MWCNTs/CS)n membranes are also investigated. © Springer Science+Business Media 2013.
Xu X.,Jilin Electric Power Research Institute |
Chen H.-L.,Wenzhou University
Soft Computing | Year: 2014
Bacterial foraging optimization (BFO) is predominately used to find solutions for real-world problems. One of the major characteristics of BFO is the chemotactic movement of a virtual bacterium that models a trial solution of the problems. It is pointed out that the chemotaxis employed by classical BFO usually results in sustained oscillation, especially on rough fitness landscapes, when a bacterium cell is close to the optima. In this paper we propose a novel adaptive computational chemotaxis based on the concept of field, in order to accelerate the convergence speed of the group of bacteria near the tolerance. Firstly, a simple scheme is designed for adapting the chemotactic step size of each field. Then, the scheme chooses the fields which perform better to boost further the convergence speed. Empirical simulations over several numerical benchmarks demonstrate that BFO with adaptive chemotactic operators based on field has better convergence behavior, as compared against other meta-heuristic algorithms. © 2013 Springer-Verlag Berlin Heidelberg.
Jilin Electric Power Research Institute and State Grid Corporation of China | Date: 2013-08-02
0.2Ss class special-type high-voltage measuring current transformer belongs to a field of current transformer. An iron core includes two kinds of L-shaped sheets with the same size, wherein a ratio of a long side to a short side of each L-shaped sheet is 3:2; a first kind of the L-shaped sheets are permalloy sheets (1) and a second kind of the L-shaped sheets are cold rolled silicon steel sheets (2); and required windings are wound on each side of the iron core. Sheets of the iron core of the current transformer include the permalloy sheets and the cold rolled silicon steel sheets, which improves performance of the iron core. Utilizing structural characteristics of the iron core of different materials, a fractional turn compensation of coils is formed, which realizes a precise measurement.
Lu Q.,Dalian University of Technology |
Wang W.,Jilin Electric Power Research Institute |
Han S.,Northeast China Bureau of Electricity Regulatory Commission of China |
Yuan S.,Northeast China Bureau of Electricity Regulatory Commission of China |
And 2 more authors.
Dianwang Jishu/Power System Technology | Year: 2013
With the increase of wind power curtailment more and more, how to effectively evaluate the wind power curtailment in future power grid becomes an important problem, which both macroscopic decision-making departments and wind power generation enterprises pay special attention to. A new evaluation method for wind power curtailment is proposed, and its principle is as following: for a certain level year, firstly based on typical daily load curve of each month the load curves of all days in the month are simulated, and then by means of analyzing peak load regulation ability of power sources the power grid's space of accommodating wind power is attained; secondly the historical p.u. curve of wind power multiplied by the planned installed capacity of wind power generators is taken as the possible wind power output curve; thirdly through the comparison of power grid's space to accommodate wind power with the possible wind power output curve the time-sequence curve of curtailed wind power of each day can be obtained. Using this curve various kind of data, such as annual wind power curtailment ratio, annual utilization hours, duration curve of annual curtailed wind power, monthly distribution of annual wind power curtailment and peak-valley distribution of annual wind power curtailment can be achieved by statistics thus the situation of wind power curtailment in the level year can be fully reflected. Using the proposed method, the situation of wind power curtailment within Northeast power grid in 2015 is evaluated.
Zhang R.,Jilin Electric Power Research Institute |
Wu C.,Northeast Dianli University
Lecture Notes in Electrical Engineering | Year: 2016
A vast number of cracks have appeared at the exit of the boiler vertical water wall, which causes the boiler outage during the 350 MW supercritical unit. To solve this problem, we analyze the characteristics of cracks and boiler-related operating curve is in operation. The study found that the main factor leading to the cracks at the exit of the boiler vertical water wall is thermal stress resulted from large-scale temperature deviations between pipes and rapid changes in pipe temperature. The thermal stress generally emerged under the low-load condition after the boiler turns to dry state. In addition, there is a correspondence between vertical water wall tube temperature fluctuations and changes in boiler feed water. We made the three following recommendations for the causes and characteristics of cracks at the exit of boiler vertical water wall. First, it is to minimize this type of boiler long-term low-load operation in the dry state. Second, the operating personnel shall monitor the vertical water wall outlet temperature under the low-load after the boiler turns to dry state. Finally, we increase the adjustment ability of automatic water supply and automatic coal supply to coal–water ratio. © Springer-Verlag Berlin Heidelberg 2016.
Chen T.,Jilin Electric Power Research Institute
Chinese Journal of Endemiology | Year: 2014
Objective To compare the effectiveness of two kinds of defluorinating agents (bone char and modified clay) for removal of fluoride in drinking water, and to analyze their application feasibility in small towns. Methods Influencing factors on defluorinating efficiencies of the two kinds of defluorinating agents under the same conditions were studied, namely the effects of adsorption time, temperature, pH, common anions and cations, and solid-liquid ratio on defluorinating efficiencies were studied. The defluorinating efficiencies of the two kinds of defluorinating agents were validated by original groundwater in Jilin Province. The homemade bone char defluorinating agent and modified clay defluorinating agent were regenerated by NaOH and Al2(SO 4)3, respectively, and their regeneration abilities were investigated. Results The adsorption data of the two kinds of defluorinating agents were fitted Langmuir model well, and the maximum adsorption capacities were 10.225 g/kg(bone char) and 0.587 g/kg (modified clay). The effect of temperature on defluorinating efficiencies was limited, with increasing temperature( 10 - 35 °C ), the adsorption capacity of bone char and modified clay for fluoride ranged from 1.568 g/kg to 1.598 g/kg and 0.423 g/kg to 0.470 g/kg, respectively. Fluoride could be easily removed under low pH conditions, with increasing of pH(4 - 10), the adsorption capacity of bone char and modified clay for fluoride decreased from 1.598 g/kg to 1.523 g/kg and 0.724 g/kg to 0.320 g/kg, respectively. The defluorinating efficiencies were improved by common cations(Ca2+) in groundwater, and the adsorption capacity of bone char and modified clay for fluoride increased to 1.713 g/kg and 0.485 g/kg, respectively. Whereas, the defluorinating efficiencies were inhibited by common anions(HCO3 -, SO4 2-) at a certain degree, and the adsorption capacities of bone char and modified clay for fluoride were decreased to 1.158 g/kg(HCO3 -) and 0.237 g/kg(SO4 2-), respectively. Defluoridation bone char could be regenerated by soaking in NaOH, and modified clay by immersion in Al 2(SO4)3. The adsorption capacities of the two defluorinating agents that had been regenerated for three times still reached 94.6% and 97.3% of their original capacities. Conclusions Both of the homemade bone char defluorinating agent and modified clay defluorinating agent have good defluorinating efficiencies and can be regenerated for many times, which are perfectly suitable for application in small towns since they are simple and can be easily applied. The homemade bone char defluorinating agent is suitable for family drinking water and the homemade modified clay defluorinating agent would be more suitable for centralized drinking water.
Bi Z.,Jilin Electric Power Research Institute |
Gao C.,Jilin Electric Power Research Institute
Proceedings of the 5th IEEE International Conference on Electric Utility Deregulation, Restructuring and Power Technologies, DRPT 2015 | Year: 2015
The large-scale integration of wind power plays an increasingly important role in power systems. Accurate and effective modeling and simulation methods of wind power are urgently demanded. This paper studies the actual wind power generation over time, and proposes an electromagnetic transient model of wind power generation. Also, the hybrid transient (electromagnetic transient and electromechanical transient) programs are implemented with the consideration of the electromagnetic networks of wind-farm sides and electromechanical networks of Jilin-Grid sides, respectively. The proposed wind power generation model is verified through real measurement data. The proposed work is promising for the electromagnetic transient wind power integration research. © 2015 IEEE.
Chen T.,Jilin Electric Power Research Institute |
Sun C.,Jilin Electric Power Research Institute
Chemical Research in Chinese Universities | Year: 2016
On the basis of comparing the adsorption loss of different surfactants[single nonionic surfactant sorbitanmonooleatepolyoxyethylene ether(Tween 80), anionic surfactant sodium dodecyl benzene sulfonate(SDBS), and mixed surfactants Tween 80/SDBS(3:2), Tween 80/SDBS(4:1)] and their performance in the enhancement of polychlorinated biphenyls(PCBs) desorption from soil, the impact of electric field intensity on the desorption of PCBs and the transport of surfactants in washing resulted solution were investigated in this study. With regard to the remediation cost, 1000 mg/L mixed Tween 80/SDBS(3:2) was recognized as an optimum concentration in the remediation of PCBs-contaminated soil, because Tween 80/SDBS(3:2) had the highest washing capacity and relatively low adsorption loss onto soil. Electrokinetics can enhance the washing efficiency of PCBs-contaminated soil by Tween 80/SDBS(3:2) effectively and safely at an electric field intensity of 1.5 V/cm for 10 d, for the desorption of PCBs was 1.57 times more than that without electrokinetics, and the most of organic residue in washing resulted solution was removed in an electrical field to avoid the possible secondary contamination risk. © 2016, Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH.