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The computation of circulating currents between parallel conductors is a difficult problem in reactor and transformer design. A direct field-circuit coupling FEM model has been established to analyze the magnetic field of air core power reactor. And the circulating current losses has been calculated based on the magnetic field distribution.
This paper presents a dual-buck full-bridge inverter (DBFBI) with different inductor structures. All power devices operate at each half line cycle, and the freewheeling current flows through the independent diodes instead of the body diodes of the switches. Shoot-through problem does not exist. However, the DBFBI has four inductors, so the weight and volume of the inverter may be large. In order to...
Supercritical water-cooling reactor is one of the advanced nuclear power plants as the fourth generation reactor of internationally recognized. The plant system design is once-through cycle, feed-water flow rate are provided from pressure head by pump through the reactor core became steam, and directly into the turbine. There is not a recirculation loop in this cycle, this is the the biggest difference...
Numerical simulation of unsteady three-dimensional turbulent flow in a mixed flow reactor coolant pump was achieved by using a phased-lagged method. Based on Reynolds averaged Navier-Stokes equations with S-A turbulence models in commercial software Numeca, pressure distribution in impeller, diffuser and volute was obtained, and focused on pressure fluctuations caused by impeller-diffuser interaction...
With fatty acid as raw material, using the two-step method, first, we use concentrated H2SO4 as a catalyst for esterification of fatty acid and methanol to reduce AV (acid value), and then we added methanol into the peristaltic pump to make its AV drop to below 1 mg KOH /g oil. The best condition of first stage: the temperature is 65±2°C, the catalyst dosage is 1%, the methanol to fatty acid ratio...
Denitrification (De-NOx) agents using activated carbon (AC) as the support have a large specific surface area, good pore structure, low reaction temperature and low price, amongst others. In this work, CuO/AC catalysts with coconut AC supported copper were prepared. De-NOx experiments were conducted in a fixed-bed reactor using a simulated flue gas stream to investigate the effects of calcination...
The performance of an indirect Non-thermal plasma (INTP) system used to decompose harmful exhaust emission from diesel engine was experimentally studied, using a self-designed dielectric barrier discharge (DBD) NTP reactor with coaxial cylinder structure. The impact of peak to peak value (Vp-p) and frequency of voltage-supplied, flow rate of air and the temperature of discharge zone on the concentration...
Using biomass for energy generation is getting increasing attention. At present, gasification of biomass is taken as a popular technical route to produce synthesized gas for application in boiler, engine, gas turbine or fuel cell. In this study, a new approach of steam reforming of biomass and glycerol for synthesized gas production has been primarily investigated in a fixed-bed reactor. The effects...
Several typical solutions for point-reactor neutron dynamic equation were introduced, which includes Gear method, Decoupling method, Taylor polynomials method, Prompt jump approximate, as well as some improved methods, such as SCM method, Taylor polynomial integral method etc. The calculation ideas and equations or iterative formula of these solutions were analyzed in the paper, then the comparison...
This paper presents a novel digital control algorithm to enhance the dynamic performance of a dc-dc converter for non-high-frequency arc (NHFA) plasma cutting power supply. Using the principle of capacitor charge balance, the proposed algorithm predicts the optimal transient for a dc-dc converter during a load change. A 16kW experimental prototype of the NHFA plasma cutting power supply is designed...
Present single-phase reclosure in ultra-high-voltage (UHV) and extra-high-voltage (EHV) transmission lines normally using a dead reclosing time may aggravate severe damage to the system and equipments, for unsuccessful reclosure in permanent fault or insufficient transient fault. Thus, it is important to study on the single-phase permanent detection technique aiming to lower unsuccessful reclosing...
In order to study the removal effect of non-thermal plasma (NTP) after-treatment system on diesel engine harmful emissions, a dielectric barrier discharge (DBD) plasma reactor is designed, and the NOx removal effect is studied. The results show that reduce the initial concentration of NO, increase the residual time and decrease the gas flow rate would get a high NO removal efficiency. NO reduction...
In order to meet the challenges of increasing energy demand, renewable energy plays a significant role in energy strategy nowadays in China. Bioenergy as carbon free energy, is considered one of the most promising renewable energy sources that can supply heat and electricity. The paper introduces characteristics of biomass and related equipment expounds on the direction of research of biomass gasification,...
In this paper an overview of the coupling methodologies between reactor physics (Neutronics) and thermal hydraulic have been studied by taken into account the previous and ongoing research. The current study includes the neutronics and thermal hydraulic model and the coupling methodology between the two phenomenons which is inter related with computational approach. Since the coupling involves some...
A reliability predication method based on GO methodology for fuel cycling system (FCS) in pebble bed reactor is introduced. Regarding to the specific structure and function of the FCS, the probability of FCS was defined. By using decomposition and reconstruction the probability of complex bridging system was calculated directly, some new operators and corresponding algorithm were derived. The comparison...
The performances of three anaerobic filters (AF) with different types of supporting media (soft and hard packing double-media (SHM), hard packing media (HM) , and soft packing media(SM)) were evaluated through their ability to remove organic compounds in winery wastewater and biogas energy recovery. When hydraulic retention time (HRT) is 10 days and volume organic loading rate (OLR) is 9.02kgCOD/m...
This article uses the BEM electromagnetic field calculation way to simulate the internal electric field distribution of shunt reactor, and discusses the internal electric field impact of reactor about shunt reactor sealed surface insulation cracking and the installation position of multi-tap arc-suppression coil. Simulation results show that sealed surface crack is not only easy to cause the sealed...
The calculation model was built under cold condition, based on real geometric structure, 1:1 size experimental device of main reactor of TiO2 in Jinzhou Titanium Industry. And numerical simulation was carried out by commercial CFD software, aiming to analyze internal flow and mixture of multi inlet vertical jet and main-stream. By comparing the numerical simulation results with the experimental data,...
AC gliding arc reactor producing syngas (H2+CO) for partial oxidation of methane in an atmospheric gliding arc discharge has been designed and constructed. In this case, no catalysts are used to assist reforming; the plasmas play a role as catalyst and provide the energy for such reactions. The oxygen in the air is used for the partial oxidation of methane. The methane conversion and the energy efficiency...
This paper discusses theory of secondary arc current on UHV double-circuit lines and introduces 2 compensation schemes: the neutral reactors of shunt reactor compensation and high-speed grounding switches. Using a practical UHV double-circuit line as an example, the mathematical model based on the practical parameters has been built using PSCAD/EMTDC. When the model utilizes 2 compensation schemes...
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