Catalytic Kinetics and CFD Simulation of Multi-Stage Combined Removal of Acrylonitrile Tail Gas

2021 ◽  
Author(s):  
Zhao Du ◽  
Qian Liu ◽  
Yuxuan Yang
Keyword(s):  
Cfd Simulation ◽  
Multi Stage ◽  
Catalytic Kinetics

The catalytic kinetics and cfd simulation of multi-stage combined removal of acrylonitrile tail gas

2021 ◽  
pp. 115-125
Author(s):  
Zhao Du ◽  
◽  
Qian Liu ◽  
Yuxuan Yang ◽  
◽  
...  
Keyword(s):  
Mathematical Model ◽  
Kinetic Model ◽  
Catalytic Reaction ◽  
Cfd Simulation ◽  
Reaction Network ◽  
External Diffusion ◽  
Quantitative Calculation ◽  
Dynamic Factors ◽  
Multi Stage ◽  
Catalytic Kinetics

There is no kinetic data and rate equation that can be used directly for catalytic combustion of acrylonitrile tail gas, which leads to the multi-stage combined catalytic kinetic model of acrylonitrile tail gas collaborative removal. In the actual application process, affected by the internal and external diffusion, this paper proposes the multi-stage combined catalytic kinetic research and CFD simulation analysis of acrylonitrile tail gas collaborative removal. Based on the judgment of multi-stage combined catalytic reaction rules of acrylonitrile tail gas collaborative removal, the multi-stage combined catalytic reaction network of acrylonitrile tail gas collaborative removal is solved by matrix transformation. The possible reaction path in the multi-stage combined catalytic reaction network of acrylonitrile tail gas collaborative removal is solved. For quantitative calculation of product distribution, each step of reaction parameters and dynamic factors are required. According to the mechanism of positive carbon ion reaction, materials were used Studio software and genetic algorithm are used to calculate the dynamic factors and determine the dynamic parameters; the grid automatic generator AutoGrid5 embedded in the Fine/TurboTM software package is used to generate the CFD simulation network, and the iterative algorithm is used to calculate the limit value of the CFD simulation; the S-A model in the CFD simulation platform is used to get the modified value of the dynamic mathematical model, and the dynamic factors and parameters are brought into it to establish the CA mathematical model of multi-stage combined catalytic kinetics for the CO removal of olefine and nitrile tail gas. The experimental results show that, under the same experimental device and parameters, the internal and external diffusion effects of the multi-stage combined catalytic kinetic model of acrylonitrile tail gas collaborative removal are detected. The multi-stage combined catalytic kinetic model of acrylonitrile tail gas collaborative removal in this study uses 10-20 mesh catalyst, and the retention time of acrylonitrile tail gas is less than 4.62 s, the internal and external diffusion will not affect the acrylonitrile tail gas collaborative removal The practical application of the kinetic model for the removal of multi-stage combined catalysis.

Flow Passage Modification and Experimental Verification of a Multi-Stage Centrifugal Pump

2013 ◽  
Vol 753-755 ◽  
pp. 2766-2769
Author(s):  
Quan Zhang ◽  
Zhi Jun Shuai ◽  
Pan Zhou ◽  
Wan You Li
Keyword(s):  
Centrifugal Pump ◽  
Cfd Simulation ◽  
Acceleration Response ◽  
Vibration Acceleration ◽  
Flow Passage ◽  
Fluid Field ◽  
Multi Stage ◽  
Through Flow ◽  
Seat Vibration ◽  
Velocity Pressure

In this paper the seat vibration acceleration response was reduced through flow passage modification of the centrifugal pump which could decrease the fluid excitation of the pump. CFD simulation technology was applied to optimize the fluid field of the multi-stage centrifugal pump, and then the velocity, pressure fluctuation and fluid excitation were concerned to investigate the effect of optimization. Finally, the influence of fluid field modification on the seat vibration response was verified experimentally.

CFD Simulation of PANDA and MISTRA Cooler Tests of ERCOSAM-SAMARA Project

2014 ◽  
Author(s):  
A. S. Filippov ◽  
S. Y. Grigoryev ◽  
O. V. Tarasov ◽  
T. A. Iudina
Keyword(s):  
Cfd Simulation ◽  
Molar Fraction ◽  
Transient Behavior ◽  
Severe Accident ◽  
Steam Condensation ◽  
Multi Stage ◽  
Accident Management ◽  
Accident Conditions ◽  
Good Agreement ◽  
Three Phases

The ERCOSAM and SAMARA projects (EURATOM (EU) and ROSATOM (Russia)) include a set of multi-stage experiments carried out at different thermal-hydraulics facilities (TOSQAN, MISTRA, PANDA, SPOT). The tests sequences are aimed at investigating hydrogen concentration build-up and stratification during a postulated severe accident and the effect of the activation of Severe Accident Management systems (SAMs), e.g. sprays, coolers and passive auto-catalytic recombiners. Each test includes four phases, of which the first three phases simulate the establishment of severe accident conditions in NPP containment (injection of steam and helium (simulator of hydrogen), stratification of the gas mixture). During the fourth phase of the experiment one of the SAMs simulators is activated. All experiments were simulated at Nuclear Safety Institute of the Russian Academy of Science (IBRAE RAN) with FLUENT and, partially, OpenFOAM codes. In this paper the tests with coolers carried out on PANDA and MISTRA facilities are considered. Their simulations required development of a set of models of volumetric and near-wall condensation phenomena. The models were validated vs. already known tests and vs. integrated experiments of ERCOSAM-SAMARA projects. A brief description of the models and the used CFD methods is provided. Then the results of simulations of the four phases of the tests are presented. Some peculiarities of gas motion and helium distribution obtained in the experiments as well as in their simulations are analyzed. These phenomena concern steam condensation and helium redistribution by convective flows due to the cooler activation in the installation. Local ‘pockets’ of helium are formed with a molar fraction larger than the maximum achieved at the first three phases of the experiments. The accounting of initial and boundary conditions along with calibration of the models provided as a whole a good agreement between calculations and experimental data on transient behavior of gas composition in the facility at the first three phases and at the final fourth phase.

Kinetic study and CFD simulation on multi-stage catalytic removal of the exhaust gases from acrylonitrile plant

2019 ◽  
Vol 49 (8) ◽  
pp. 1125-1134
Author(s):  
Runduo Zhang ◽  
Ying Wei ◽  
Zichun Wang ◽  
Xiangshu Chen
Keyword(s):  
Kinetic Study ◽  
Cfd Simulation ◽  
Exhaust Gases ◽  
Multi Stage ◽  
Catalytic Removal

scholarly journals CFD analysis of fluid flow in an axial multi-stage partial-admission ORC turbine

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Jan Surwilo ◽  
Piotr Lampart ◽  
Mariusz Szymaniak
Keyword(s):  
Working Conditions ◽  
Cfd Simulation ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Subsequent Stage ◽  
Cfd Analysis ◽  
3D Cad ◽  
Multi Stage ◽  
Partial Admission ◽  
Flow Domain

AbstractBasic operational advantages of the Organic Rankine Cycle (ORC) systems and specific issues of turbines working in these systems are discussed. The strategy for CFD simulation of the considered ORC turbine and the main issues of the numerical model are presented. The method of constructing the 3D CAD geometry as well as discretisation of the flow domain are also shown. Main features of partial admission flow in the multi-stage axial turbine are discussed. The influence of partial admission on the working conditions of the subsequent stage supplied at the full circumference is also described.

scholarly journals Numerical investigation of the effect of triangle strut in vertical axis wind turbine (VAWT)

2020 ◽  
Vol 11 (2) ◽  
pp. 95
Author(s):  
Tri Admono ◽  
Yoyon Ahmudiarto ◽  
Amma Muliya Romadoni ◽  
Iman Abdurahman ◽  
Agus Salim ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Wind Turbine ◽  
Cfd Simulation ◽  
Vertical Axis ◽  
Simulation Method ◽  
Wind Flow ◽  
Vertical Axis Wind Turbine ◽  
Pressure Losses ◽  
Multi Stage ◽  
Computational Fluid Dynamics Cfd

Strut is used in vertical axis wind turbine (VAWT) to restraint the framework. In this study, struts are analyzed to show the pressure losses in VAWT. ANSYS computational fluid dynamics (CFD) software is used to investigate triangle strut in VAWT. This study aims to show a CFD simulation of struts, which affects the aerodynamic of VAWT. In CFD software, the aerodynamic of VAWT can be analyzed in terms of pressure losses in the struts. The simulation method starts by making a struts model, then meshing and setting up ANSYS's boundary conditions. The last iteration runs in ANSYS until convergence. Our results show the percentage of pressure losses with the variation of the angle of wind 0°, 20°, 40°, and 60° are 0.67 %, 0.52 %, 0.48 %, and 0.52 %. The effect of triangle strut in VAWT did not affect the wind flow to the VAWT blade. The results also indicated that the triangle strut could be applied in the multi-stage of VAWT system.

Parameters measurement of hydrodynamics and CFD simulation in multi-stage bubble columns

2014 ◽  
Vol 92 (8) ◽  
pp. 1444-1454 ◽  
Author(s):  
Haibo Jin ◽  
Yichen Lian ◽  
Ling Qin ◽  
Suohe Yang ◽  
Guangxiang He ◽  
...  
Keyword(s):  
Cfd Simulation ◽  
Bubble Columns ◽  
Multi Stage ◽  
Parameters Measurement

CFD Simulation of a Multi-Stage Centrifugal Pump

2017 ◽  
Author(s):  
H. Ding ◽  
W. Gao ◽  
H. Gao
Keyword(s):  
Centrifugal Pump ◽  
Performance Prediction ◽  
Cfd Simulation ◽  
Main Flow ◽  
Cfd Model ◽  
Experiment Data ◽  
Flow Channels ◽  
Multi Stage ◽  
Simulation Results ◽  
Multistage Pump

In this paper, a CFD software package is applied to the performance prediction of a 14-stage centrifugal pump with opposed impeller configuration. In this study, the fluid volumes of the complete multistage pump are simulated together. The CFD model includes not only all the main flow channels from inlet to discharge, but also all the secondary flow passages such as wearing ring leakage and seal flush. The CFD model and the simulation results will be presented and discussed in detail. The CFD prediction will be compared with available experiment data.

scholarly journals Implementation of P-Controller in Computational Fluid Dynamics (CFD) Simulation of a Pilot Scale Outlet Temperature Controlled Spray Dryer

2018 ◽  
Author(s):  
Sepideh Afshar ◽  
Hasan Jubaer ◽  
Lloyd Metzger ◽  
Hasmukh Patel ◽  
Cordelia Selomulya ◽  
...  
Keyword(s):  
Spray Drying ◽  
Cfd Simulation ◽  
Pilot Scale ◽  
Inlet Temperature ◽  
Outlet Temperature ◽  
State University ◽  
Air Inlet ◽  
Multi Stage ◽  
Dairy Plant ◽  
Temperature Controlled

Most of the CFD simulations of spray dryers reported in the literature utilizes a fixed air inlet temperature numerical framework.  In this paper, a numerical framework was introduced to model spray drying as an outlet air temperature controlled process.  A P-controller numerical framework was introduced which allows the inlet temperature to be automatically adjusted based on the required outlet temperature set point.  This numerical framework was evaluated with a simulation of a two-stage pilot scale spray drying system at the Davis Dairy Plant (South Dakota State University) which is used for commercial contract spray drying operation. Keywords: CFD simulation; Multi-Stage Spray Drying; P-Controller 

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