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Li D.-Y.,Beijing University of Technology | Sun Y.-L.,Chinergy Company Ltd | Li Y.,Beijing University of Technology | Yan W.-M.,Beijing University of Technology
Gongcheng Lixue/Engineering Mechanics | Year: 2014

In order to study the load bearing and deformation capacity of a large-span half steel-plate-reinforced concrete (HSC) beam, a static test of a scaled down (1:3) simply supported specimen is conducted. The mechanical characteristics and damage process of the HSC specimen are investigated by analyzing the development of the deflection, strain and fracture during loading process. Good combination action is observed during the test in steel plates, reinforcing bars and concrete in HSC beam; and the specimen has good mechanical properties of high bearing capacity, large stiffness and high ductility. At last, the calculation formulae for the bending capacity and short-term stiffness of the composite beam in existing codes are examined via the experimental results and theoretical analysis, which provides a reference for engineering design.

Liu B.,CAS Wuhan Institute of Rock and Soil Mechanics | Gong L.,Chinergy Co. | Song Q.,CAS Wuhan Institute of Rock and Soil Mechanics
Applied Mechanics and Materials | Year: 2013

Combined with the dynamic compaction example of a nuclear power plant, a fully field tests was conducted to get the permeability and integrality of the impervious wall in real time. The dynamic compaction vibration impact on impervious wall was researched based on the test results. The relationships between damage characteristic and peak particle velocity of impervious wall are suggested also. The safety control standards which used vibration safety threshold to control the potential damage for impervious wall under long-term dynamic compaction were presented. When the PPV of impervious wall is not exceeding the safety threshold, the impervious wall will in its secured state. According to the damage detection method and the presented safety threshold of vibration velocity, the protected structure can be simply and protected during dynamic compaction. The research methods reflects the damage of protected structure directly, and more accurate and safety than traditional methods. © (2013) Trans Tech Publications, Switzerland.

Shen K.,Cooperation Technology | Su J.,Cooperation Technology | Zhou H.,Cooperation Technology | Zhou H.,Chinergy Co. | And 3 more authors.
Nuclear Engineering and Design | Year: 2015

A pebble-bed higherature gas-cooled reactor (pebble-bed HTR) uses a helium coolant, graphite core structure, and spherical fuel elements. The pebble-bed design enables on-line refueling, avoiding refueling shutdowns. During circulation process, the pebbles are lifted pneumatically via a stainless steel lifting pipe and reinserted into the reactor. Inevitably, the movement of the fuel elements as they recirculate in the reactor produces graphite dust. Mechanical wear is the primary source of graphite dust production. Specifically, the sources are mechanisms of pebble-pebble contact, pebble-wall (structural graphite) contact, and fuel handling (pebble-metal abrasion). The key contribution to graphite dust production is from the fuel handling system, particularly from the lifting pipe. During pneumatic lift, graphite pebbles undergo multiple collisions with the stainless steel lifting pipe, thereby causing abrasion of the graphite pebbles and producing graphite dust. The present work explored the abrasion behavior of graphite pebble in the lifting pipe by measuring the abrasion rate at different lifting velocities. The abrasion rate of the graphite pebble in helium was found much higher than those in air and nitrogen. This gas environment effect could be explained by either tribology behavior or dynamic behavior. Friction testing excluded the possibility of tribology reason. The dynamic behavior of the graphite pebble was captured by analysis of the audio waveforms during pneumatic lift. The analysis results revealed unique dynamic behavior of the graphite pebble in helium. Oscillation and consequently intensive collisions occur during pneumatic lift, causing significant abrasion of the graphite pebble. This study provides an excellent explanation for the abrasion behavior of graphite pebbles in the lifting pipe of the pebble-bed HTR. © 2015 Elsevier B.V. All rights reserved.

Yao Q.-X.,Chinergy Co. | He X.-D.,Tsinghua University
Hedongli Gongcheng/Nuclear Power Engineering | Year: 2011

The newly designed ball dropping valve for the reactor shutdown system is a nuclear safety class equipment, and its design needs to be verified through substantial experiments. The control system of the test platform for the ball dropping valve is built to control, survey and protect a testing prototype of the valve's driving component, and also to provide the methods of data collection and design scheme verification during the test. A control scheme which consists of PLC, stepping motor and position indicator is proposed, the model selection, control principle design and system integration and upgrading have been conducted, and some control circuit and components to be used are fully tested.

Huang X.,Harbin Institute of Technology | Gao D.,Harbin Institute of Technology | Cong Y.,Chinergy Co. | Wang X.,Harbin Institute of Technology
Shengwu Gongcheng Xuebao/Chinese Journal of Biotechnology | Year: 2014

An expanded-granular sludge bed (EGSB) reactor was set-up with artificial water by seeding a 60 d stored ANAMMOX sludge. The nitrogen removal efficiency of ANAMMOX enrichment culture in the reactor was determined. In addition, the main microbial populations and the relative abundance of ANAMMOX bacteria were investigated by molecular approaches. Results show that the maximum nitrogen removal rate was 3.0 kg-N·m-3·d-1 after 185 d, and the ammonium and nitrite removal efficiencies were all over 85%. Analysis of 16S rRNA gene-cloning indicates that the main microbial population in the ANAMMOX enrichment culture was changed from Candidatus Brocadia fulgid and Candidatus Brocadia brasiliensis (0 day) to Candidatus Jettenia asiatica (185 day). Fluorescence in situ hybridization analysis shows that the relative abundance of ANAMMOX bacteria was increased from (57.69±4.79)% to (83.32±4.40)%. The results of qPCR further indicate that the gene copies of ANAMMOX bacteria in the granules were increased from 1.14×1011 copies/g wet weight to 3.69×1011 copies/g wet weight. ©2014 Chin J Biotech, All rights reserved.

Zhao M.,Beijing University of Chemical Technology | Zhao M.,Chinergy Co. | Song H.,Beijing University of Chemical Technology
Materials Chemistry and Physics | Year: 2010

Carbon-encapsulated iron carbide/iron nanoparticles have been synthesized on a large scale by the heat treatment of thermal plastic phenolic-formaldehyde resin with the aid of ferric nitrate. The effects of heating temperature on the morphologies and structures of carbonized products were investigated using transmission electron microscope, high-resolution transmission electron microscope and X-ray diffraction measurements. The products with diameter distribution of 20-100 nm consisted mainly of spheroidal nanoparticles separated by hollow onion-like carbon nanoparticles. © 2010 Elsevier B.V. All rights reserved.

Zhao M.,Beijing University of Chemical Technology | Zhao M.,Chinergy Co. | Song H.,Beijing University of Chemical Technology
Journal of Materials Science and Technology | Year: 2011

The catalytic graphitization of thermal plastic phenolic-formaldehyde resin with the aid of ferric nitrate (FN) was studied in detail. The morphologies and structural features of the products including onion-like carbon nanoparticles and bamboo-shaped carbon nanotubes were investigated by transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction and Raman spectroscopy measurements. It was found that with the changes of loading content of FN and residence time at 1000°C, the products exhibited various morphologies. The TEM images showed that bamboo-shaped carbon nanotube consisted of tens of bamboo sticks and onion-like carbon nanoparticle was made up of quasi-spherically concentrically closed carbon nanocages. © 2011 The Chinese Society for Metals.

Wang Y.,Tianjin Key Laboratory of Advanced Joining Technology | Wang Y.,Tianjin University | Wang Y.,Chinergy. Co. | Hu S.,Tianjin Key Laboratory of Advanced Joining Technology | And 3 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

This study was based on the ferritic stainless steel SUS430. Under the parallel welding conditions, the critical penetration power values (CPPV) of 3mm steel plates with different surface-coating activating fluxes were tested. Results showed that, after coating with activating fluxes, such as ZrO2, CaCO3, CaF2 and CaO, the CPPV could reduce 100∼250 W, which indicating the increases of the weld penetrations (WP). Nevertheless, the variation range of WP with or without activating fluxes was less than 16.7%. Compared with single-component ones, a multi-component activating flux composed of 50% ZrO2, 12.09% CaCO3, 10.43% CaO, and 27.49% MgO was testified to be much more efficient, the WP of which was about 2.3-fold of that without any activating fluxes. Furthermore, a FeCl3 spot corrosion experiment was carried out with samples cut from weld zone to test the effects of different activating fluxes on the corrosion resistant (CR) property of the laser welded joints. It was found that all kinds of activating fluxes could improve the CR of the welded joints. And, it was interesting to find that the effect of the mixed activating fluxes was inferior to those single-component ones. Among all the activating fluxes, the single-component of CaCO3 seemed to be the best in resisting corrosion. By means of Energy Dispersive Spectrometer (EDS) testing, it was found that the use of activating fluxes could effectively restrain the loss of Cr element of weld zone in the process of laser welding, thus greatly improving the CR of welded joints. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Wang Y.,Tianjin Key Laboratory of Advanced Joining Technology | Wang Y.,Tianjin University | Wang Y.,Chinergy. Co. | Hu S.,Tianjin Key Laboratory of Advanced Joining Technology | And 3 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

The ferritic stainless steel SUS430 was used in this work. Based on a multi-component activating flux, composed of 50% ZrO2, 12.09 % CaCO3, 10.43 % CaO, and 27.49 % MgO, a series of modified activating fluxes with 0.5%, 1%, 2%, 5%, 10%, 15%, and 20% of rare earth (RE) element yttrium (Y) respectively were produced, and their effects on the weld penetration (WP) and corrosion resistant (CR) property were studied. Results showed that RE element Y hardly had any effects on increasing the WP. In the FeCl3 spot corrosion experiment, the corrosion rates of almost all the samples cut from welded joints turned out to be greater than the parent metal (23.51 g/m2 h). However, there was an exception that the corrosion rate of the sample with 5% Y was only 21.96 g/m2 h, which was even better than parent metal. The further Energy Dispersive Spectrometer (EDS) test showed the existence of elements Zr, Ca, O, and Y in the molten slag near the weld seam while none of them were found in the weld metal, indicating the direct transition of element from activating fluxes to the welding seam did not exist. It was known that certain composition of activating fluxes effectively restrain the loss of Cr element in the process of laser welding, and as a result, the CR of welded joints was improved. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Liu S.,North China Electrical Power University | Wang Z.,North China Electrical Power University | Sun C.,Chinergy Co.
Dianwang Jishu/Power System Technology | Year: 2011

The calculation results of three-dimensional electric field of valve tower in DC converter station plays important directive role in the design of shielding case for valve towers and the control of its surface field intensity. However, due to its enormous volume and complex structure, there are difficulties in the geometrical modeling and digital simulation of shielding case for valve tower. To save computing resource, firstly utilizing ANSYS parametric design language (APDL) an integral dissection model is built; then by use of Galerkin indirect boundary element the electric field intensity at the surface of shielding case is analyzed and the distribution of three-dimensional electric field at the surface of shielding case is calculated. Calculation results show that under current design scheme the maximum field intensity at the surface of shielding case is 20.2 kV/cm, so if the value of 30 kV/cm is taken as the criterion for corona onset field intensity, there is no corona on the shielding case. This criterion is available for reference in the design and planning of shielding case for valve tower in DC converter station.

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