Papers by Keyword: Reactor

Abstract: With the development of high voltage long distance transmission and the expansion of the capacity of power grid, it is becoming more and more important to develop new device to realize reactive power compensation. A hybrid controllable rector is developed in this paper. The principle is introduced in detail and a 220V single phase prototype is made. Relevant experiments have been done to test its adjustment performance. Results show that there is no harmonic exist. Hybrid controllable reactor can realize many adjustment levels between 0 to 100%. Also, the shortage is given in the paper which is needed to research in the future work.

Abstract: The purpose of this research is to design and to modify a monomer reactor tank in order to achieve higher output production of bio-monomer. The main aspect of this design is based on producing good quality and higher yielding of monomer. The design was started on lab scale process of 2L beaker into a 5L reactor. The most important point of the design is to produce larger amount of monomer as compared to lab scale equipment. Selecting material is vital on the process and cost for fabricating the reactor. It is to prevent chemical corrosion on the reactor and to produce higher yield of monomer with cost effective way. The optimization and analysis of the design and materials of a reactor were based on influence of heat and chemical resistance on the reactor. The design and analysis process were done using Solidworks and chemical resistance were based on the standard chemical chart for common materials used for a reactor. The best material for the reactor is Stainless Steel 316 based on chemical chart, heat resistance and cost effective. The yielding of monomer is more than 100% by lab scale method with predetermined controlled parameters of stirring speed and temperature. There were small differences between every samples. At 80°C, the yielding of monomer is the highest while the by product (water) is the lowest. Meanwhile, at 60°C the monomer yielding is the lowest with highest by-product.

Abstract: With the development of power electronics technology, PWM devices have been widely used. Non-sinusoidal power brings us serious vibration problem. In this paper, vibration acceleration measuring system is applied for detecting the vibration of reactor under SPWM modulated wave.

Abstract: After analytical studies of the characteristics of various slurry and supported photocatalytic reactors, a photocatalytic reactor with photocatalyst film loaded on substrate is designed in this paper. This reactor is characterized by the easy attachment and convenient installation & replacement of photocatalyst, higher light utilization, and complete photocatalytic reaction.

Abstract: With the development of high voltage long distance transmission and expansion of the grid, continuous reactive power compensation devices become more and more important. This paper aims to analyze a novel hybrid adjustable reactor. Based on analysis of structure and theory, simulation model and prototype are done to verify the characteristics of this reactor. Results of simulation and test confirm that the variation range of reactive power capacity is 3.5%~84.0%, and work voltage and current are approximately sinusoidal, the harmonic content is quite little. In a word, this novel hybrid adjustable reactor will play an important role in reactive power compensation.

Abstract: A new reactor was designed. It based on magnetic field and photocatalytic technology which have the ability to improve the swage treatment effect. It was improved and optimized according to combining photocatalysis with the magnetic field that could strengthen photocatalysis process. The modified k-ε equation model was used to simulate the wastewater velocity in the reactor. Results show that in the reaction zone,the fluid appeared circulation and the turbulence intensity was strong,which had advantage of increasing the contact of photocatalytic materials and organic molecules for improving the magnetic field and photocatalysis coupling reactive efficiency.

Abstract: The author researches the conversion of N_xO_y and C_xH_y through a numerical simulation of the NTP and catalytic reactor, which contains the following factors: for instance the effect of flow, electrode diameter, reaction temperature, reaction time, voltage, frequency and electrode spacing, etc. The simulation results of NTP and catalytic reactor on the organic waste gas (N_xO_y and C_xH_y) reaches its optimum purification effect when the parameters are fixed as below: the flow is 5 l/s, the electrode diameter is 0.3 mm, the reaction temperature is 350 K, the reaction time (radial velocity) is 0.4 m/s,the voltage is 40 Kv, the frequency is 80 Hz.

Abstract: The palm fruit biomass is introduced into the pyrolysis reactor bed and the transport equations for heat, mass and momentum transfer are solved using computational fluid dynamics (CFD) technique. The Eulerian-Eulerian approach is employed to model fluidizing behavior of the sand for an externally heated reactor prior to the introduction of the biomass. The particle motion in the reactor is computed using the drag laws which depend on the local volume fraction of each phase. Heat transfer from the fluidized bed to the biomass particles together with the pyrolysis reactions were simulated by Fluent CFD code through user-defined function (UDF). Spontaneous production of pyrolysis oil, char and non-condensable gases (NCG) confirm the observation widely reported in literature. The computer model can potentially be used to assess other candidate biomass sources also to assist design of optimized pyrolysis reactors.

Abstract: Some simulation and experimental researches on magnetic-valve controlled reactor (MCR) have been done in this paper. Firstly, the equivalent circuit of MCR is derived according to the operational principle. Secondly, based on MATLAB/Simulink, the simulation model is established, in addition, the simulation researches are carried out. Thirdly, a MCR, with rated voltage 220V and rated capacity 600VA, is designed and tested. Comparing the experimental results with simulation results prove the validity of simulation model.

Abstract: The study of heat transfer phenomenon in porous media by fluids percolated in the axial direction has been of interest to many researchers in various branches of science and technology. Applications are directed to different process such as filtration, distillation, absorption and adsorption in columns, drying and catalytic reactions in fixed beds. The literature has presented several solutions of the heat diffusion / convection equation in fixed bed reactors, but these studies are limited to a cylindrical geometry. In this sense, this work aim to present a pseudo-homogeneous three-dimensional model to describe the steady-state heat transfer within a fixed bed reactor with elliptic cylindrical geometry by considering variable porosity. The energy equation written in elliptical cylindrical coordinates and applied to the porous medium (particulate system) is discretized numerically using the finite volume method. Results of the temperature distribution within the bed are presented analyzed. It was verified that with increased porosity heat transfer inside the reactor tends to be more intense and thus, lower temperature gradients are found in all cross section of the reactor.