Fischer–Tropsch synthesis (FTS) is a classical topic of great significance because the approach post-petroleum times. For decades, people have attempted to develop iron-based FTS catalysts with high selectivity for lower olefins. By means anchoring effect and intrinsic basicity nitrogen-doped carbon nanotubes (NCNTs), iron nanoparticles were conveniently immobilized on NCNTs without surface premodification. The so-constructed Fe/NCNTs catalyst presents superb catalytic performance in olefins...

We develop an electric internal heating method based on a Ni-foam structured catalyst for CO₂ methanation, in which the Joule heat generated by current passing through drives reaction.

In this paper, the design, fabrication and tests of a I MJ HTS magnet for SMES was presented. The fabricated by BSSCO tapes, it consisted 44 pancakes, inner diameter winding is 400 mm, outer 568 mm height 648 inductance 6.38 H rated operation current 560 A at 4.2 K. show could be operated design parameters. will used 1 MJ/500 kVA unit which demonstrated 10 kV substation in Beijing.

The new energy revolution which will be dominated by renewable need to develop a corresponding power grid. Based on the characteristics of resources, and stability problem AC network, it was proposed that DC-based transmission grid should developed in future. high Tc Superconducting (HTS) cable competitive candidate for large-capacity energy. In this paper, progress development 360 m/10 kA HTS DC is presented, prospects discussed.

A 10-kA/360-m high-temperature superconducting (HTS) dc power cable has been developed and installed in 2012 central China. The is connecting a rectifier at substation to bus bar of an aluminum electrolysis plant. Before operating the grid, series testing on performance was conducted. results show that meets operational requirements critical current exceeds 12.5 kA. 10-kA HTS successfully energized Henan Zhongfu Industrial Company Ltd., Gongyi, China, September 26, 2012. Since then, stably...

A two-dimensional (2D) axisymmetric finite-element model was proposed to simulate the levitation characteristics of a radial-type high-temperature superconducting (HTS) bearing. The E-J power law together with an H-formulation used consider state. numerical successfully implemented using FORTRAN program. comparison experimental results simulation given validate model. It shows that they have good agreement. electromagnetic behavior inside HTS bulks also analyzed. presented in this paper can...

It is expected that superconducting technologies will play an important role in the future smart grid, because application of superconductor power grid can decrease losses, relieve overload, avoid higher levels transmission voltage, increase capacity, and improve quality stability. In recent years, high temperature (high-Tc) have achieved remarkable progress. High (HTS) equipment, such as HTS cables, transformers, high-Tc fault current limiters (SFCL), magnetic energy storage devices (SMES)...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> SMES is a potential solution for power quality issues. The development of 1 MJ/0.5 MVA now at its final stage and the device will be put into operation in live grid 10 kV late 2006 substation suburb Beijing, China. design analysis coil has been completed magnetic flux density distribution electromagnetic force on analysed by means FEM. cryogenic system adopts bath cooling method employs four...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> The design, fabrication and tests of three high temperature superconductor (HTS) coils for a rectifier-type model fault current limiter (FCL) were presented. field distributions in the coil numerically analysed by FEM. Based on strong anisotropic characteristics Bi2223/Ag tape, HTS designed fabricated. inner diameter height 80 mm 94 mm, respectively. Each consisted 8 double pancakes. Every...

High temperature superconducting (HTS) dc power cable shows a wide application prospect in the field of transmission for its nearly lossless and rather high capacity. IEE has installed 360-meter long at self-supply plant Zhongfu Industrial Company Ltd. Gongyi, Henan system operated two years. The connects 19.5 MVA/1.5 kA silicon-controlled rectifier, which with 110 kV/1 kV transformer, to bus bar an electrolytic aluminum cell. It is designed carry 10-kA current voltage 1300 V. HTS core...

Persistent current (PC) operating magnet with bore diameter of about 32 mm was design and developed based on multi- mono-filament MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> wires. The in a multi-solenoid structure. One pilot coil wound joints were fabricated at both ends, connecting it to superconducting switch for PC operation tests. demonstrate the high field temperature performance different temperatures. Numerical...

Quench protection is a key technology for the practical application of superconducting magnetic energy storage (SMES). In this paper, digital quench system has been developed kJ class SMES hybrid magnet fabricated by YBCO and BSCCO at China Electric Power Research Institute. The signal processing adopted to realize algorithm. It can trigger output that used activate circuit control ramp down in event quench. Also, human machine interface developed, which monitor operating states environment,...

High-temperature superconducting flywheel energy storage system has many advantages, including high specific power, low maintenance, and cycle life. However, its self-discharging rate is a little high. Although the bearing friction loss can be reduced by using magnetic levitation bearings windage placing in vacuum environment, of will still consumed itself. This mainly caused no-load losses generator/motor. In this article, coupler with clutch function designed to connect Torque transmission...

High-efficiency high-temperature superconducting (HTS) induction heating equipment has been regarded as a promising application for thermal processing of metal material, in which an HTS magnet generates high magnetic field to form the background iron core and rotating billet is heated by eddy current process temperature. Efficiency analysis traditional new structures are studied this paper. A type structure proposed. Through parallel connection multiple circuits, it can make more effective...

The damping and screening system (DSS) is a key structure of the hybrid high-temperature superconducting generator. In this paper, an analytical method was introduced to analyze performance DSS with different time constants on both d-axis q-axis First, distribution eddy currents in analyzed, calculation equivalent resistance, inductance, constant considered. Then, nonuniform (NDSS), splitting introduced. Using new method, parameters part, supplementing part NDSS were calculated,...

Because of the high torque and power density reliable structure, interior permanent magnet (IPM) motor is widely used in electric vehicles, becomes one most critical elements EMI propagation path. Different from induction motor, impedance curves IPM vary with rotor position, due to saliency effect. This paper analyzes mechanism this phenomenon, proposes a measurement based method model characteristic motor. The combined two sub-circuits, corresponds relative low frequency range, other range....

With the application of Silicon carbide (SiC) power MOSFETs in three phase inverters, higher level electromagnetic interference (EMI) produced. Thus, it is more urgent to predict EMI design phase. This paper describes a frequency-domain approach differential mode(DM) SiC inverters. Both noise path and DM source are modeled. The calculated result compared with experimental they agree well each other. It indicated that proposed method accurate modeling an effective for prediction system.

Insulated Gate Bipolar Transistors (IGBTs) have been widely used in power electronic systems, such as switched mode supplies, electric vehicles' motor drives and so on. However, the high switching speed of IGBT causes levels electromagnetic interference (EMI). This paper suggests a simple model with sufficient accuracy to predict electronics systems EMI levels. The predicted spectra both voltage current match measurement results. Using system time-domain simulation suggested model,...

Persistent current (PC) operation is important for certain scientific and application magnets, such as the magnet in a magnetic resonance imaging (MRI) system. To achieve PC mode, circuit resistance must be very low, thus, superconducting joints are required. In this report, of MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> wires tapes using Mg B powders flux fabricated tested. Close coil test designed to work both liquid He...

Superconducting bulk has great advantages in shielding magnetic fields owing to its high critical current density. Since the shielded area is usually larger than size of a single bulk, superconducting bulks need be stacked together form layer. However, can cause flux concentrate at gaps between bulks. In order increase effect, multiple layers are required. This increases cost. this article, structure that makes an angle gap and external field nonparallel explored. reluctance reduce leakage,...

Motor drive system in an electric vehicle (EV) connects both low voltage (LV) bus and high (HV) bus. Since the vehicle's communication, lighting, instrumentation control system, etc. are all powered by LV power supply, interference level at port of motor has a significant influence on operation EV. This paper studies coupling mechanism between HV circuit EV establishes equivalent to estimate common mode conduction supply port. research lays foundation attenuate emission conducted from