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Su J.,Tsinghua University | Li H.,Shandong University | Shi Q.,State Intellectual Property Office of P.R. China | Sha H.,Tianjin EMAGING Technology Co. | Yu S.,Tsinghua University
International Conference on Nuclear Engineering, Proceedings, ICONE | Year: 2015

The helium circulator is the key equipment to drive the helium gas flowing in the primary loop for energy exchange in HTGR. Active magnetic bearings (AMB) have been considered as an alternative to replace traditional mechanical bearings in the helium circulator. Such contactless bearings do not have frictional wear and can be used to suppress vibration in rotor-dynamic applications. It is necessary to study the vibration characteristics of the maglev helium circulator to guarantee the reactor safety. Therefore, a maglev circulator test rig was built. The power of the circulator is 180 kW and the maximum speed is 17000 rpm. For the time being, the test atmosphere is air. In this paper the test rig was introduced. Vibration test work of the maglev circulator was also carried out. The measuring points were arranged at the seat because the seat vibration level is important to evaluate the machine noise. The measuring points were also arranged at the base of the circulator housing to better study the vibration characteristics. The vibrations were measured by the LC-8024 multichannel machinery diagnoses system. At each measuring point the vibrations were detected in three directions(X, Y and Z) with the vibration acceleration sensors. The test speeds varied from 1000 rpm to 17000 rpm with an increase of 1000 rpm each time. The vibration values of the seat are from 89.5 dB at 1000 rpm to 113.3 dB at 17000 rpm. The test results showed that the maglev circulator exhibits good vibration properties. This work will offer important theoretical base and engineering experience to explore the high-speed helium circulator in HTGR. Copyright © 2015 by JSME.


Zhao G.,Tsinghua University | Wang J.,Tsinghua University | Shi Q.,State intellectual Property Office of P.R. China
International Conference on Nuclear Engineering, Proceedings, ICONE | Year: 2012

Most of lower grade heat is directly rejected to the environment by Chinese steel, cement, and chemical industry in recent years. Lower grade heat is commonly considered as waste heat in Chinese industry. With the increased demand for energy in China and under great pressure of environment emission, low grade energy should be reasonably used in Chinese industry. Organic Rankine cycle is a good way to use the huge amount of lower grade thermal energy in China. Several organic Rankine cycles is designed for different energy source in this paper. The lower grade heat in the process industry is divided into three type of energy source according its temperature. The temperature of waste heat is below to 300°C, such as residual heat from the cement industry. This kind of heat can be used both in Organic Rankine cycle and steam Rankine cycle. Calculation is done for those cycle parameters. The analysis shows that those cycles has similar performance. But for organic working fluid the exhausted gas is dry and it is very helpful for turbine designing. So the degree of super heat can be low to sufficiency use low grade thermal energy. The temperature of waste heat is below to 200°C, the organic Rankine cycle show the advantage from the analysis of thermodynamics property. The temperature of heat source is about to 100°C, the organic Rankine cycle is only available way to generate electricity, especially for geothermal, solar, and biomass sector. The performance for the cycle with regenerator and without regenerator is carried out in this research. Several working fluid is selected for the research, such as isopentane. From the research, some conclusion can be seen that organic Rankine cycle has high performance to use low grade residual energy in Chinese industry. From the thermodynamic point of view, isopentane can be a right working fluid in such cycle. The performance of organic cycle with regenerator is greater than without cycle. The potential available for using low grade thermal energy with organic Rankine cycle in big scale in China show its good future. Copyright © 2012 by ASME.


Shi J.,Shandong University | Shi J.,Beijing City University | Chen C.,Shandong University | Dang X.,State Intellectual Property Office Of P.R. China
Advanced Materials Research | Year: 2012

Shape memory alloys (SMAs) thin films have attracted much attention in recent years as intelligent and functional materials because of their unique properties. Ferromagnetic shape memory alloys (FSMAs) show large straining output, high impetus and short response time induced by the magnetic field, compared with traditional shape memory alloys. In this paper, Ni-Mn-Ga ferromagnetic shape memory alloys flims prepared by magnetron sputtering are introduced, and the research direction of Ni-Mn-Ga films is presented. © (2012) Trans Tech Publications, Switzerland.


Shi J.Z.,Beijing City University | Dang X.,State Intellectual Property Office Of P.R. China
Advanced Materials Research | Year: 2014

Concrete is the most commonly used construction material in the world over the past decades. But the increase in concrete production leads to an increase in greenhouse gases emission and environmental damage. With the current focus on sustainability, it is necessary to evaluate concrete's environmental impact and develop new materials for 'green' concrete. Green recycled aggregates and mineral admixtures are important component materials for 'green' concrete. In this paper, the development of 'green' concrete industry is introduced, and the application of materials for 'green' concrete such as green recycled aggregates and mineral admixtures are discussed. © (2014) Trans Tech Publications, Switzerland.


Shi J.,Shandong University | Shi J.,Beijing City University | Chen C.,Shandong University | Dang X.,State Intellectual Property Office of P.R. China
Applied Mechanics and Materials | Year: 2011

Shape memory alloys (SMAs) thin films have attracted much attention in recent years as intelligent and functional materials because of their unique characteristics. The sputtering thin films have been attracted great interest as powerful actuators in microelectromechanical systems (MEMS) such as microvalves, microfluid pumps, and microgrippers. Amongst SMAs, the equiatomic TiNi compound is the most widely used. In this paper, TiNi films prepared by magnetron sputtering are reviewed. The influence of parameters including thickness, target, substrate temperature and work pressure on the microstructure and properties of TiNi films are analysised. In additionally, several TiNi based ternary alloys films such as TiNiCu films, TiNiPd films and TiNiPt films are introduced. At last, the research direction of SMAs thin films is presented. © (2011) Trans Tech Publications, Switzerland.

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