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

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.

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.

The Selective Non-Catalytic Removal (SNCR) of Nitric Oxides From Engine Exhaust Streams: Comparison of Three Processes

2004 ◽  
Vol 126 (2) ◽  
pp. 234-240 ◽  
Author(s):  
Jerald A. Caton ◽  
Zhiyong Xia
Keyword(s):  
Nitric Oxide ◽  
Oxygen Concentration ◽  
Cyanuric Acid ◽  
Operating Conditions ◽  
High Oxygen ◽  
Chemical Agent ◽  
Nitric Oxides ◽  
Engine Exhaust ◽  
Exhaust Gases ◽  
Catalytic Removal

Three processes for the selective non-catalytic removal (SNCR) of nitric oxides from engine exhaust gases are compared. The three processes are similar but each uses a different chemical agent: ammonia, urea, or cyanuric acid. A number of operating conditions have been studied. In particular, results for the removal of nitric oxide are significantly different for the three processes as the oxygen concentration varies. Ammonia, urea, and cyanuric acid were found to be most effective at low, intermediate, and high oxygen concentrations, respectively. The implications of these results for a range of engines and engine applications are discussed.

Kinetic study of Huadian oil shale combustion using a multi-stage parallel reaction model

Energy ◽  
2015 ◽  
Vol 82 ◽  
pp. 705-713 ◽  
Author(s):  
Youhong Sun ◽  
Fengtian Bai ◽  
Xiaoshu Lü ◽  
Chunxia Jia ◽  
Qing Wang ◽  
...  
Keyword(s):  
Kinetic Study ◽  
Oil Shale ◽  
Reaction Model ◽  
Parallel Reaction ◽  
Multi Stage

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.

CFD simulation of exhaust gases jet from aircraft engine

Energy ◽  
2020 ◽  
Vol 213 ◽  
pp. 118610 ◽  
Author(s):  
Kateryna Synylo ◽  
Andrii Krupko ◽  
Oleksandr Zaporozhets ◽  
Ruslan Makarenko
Keyword(s):  
Cfd Simulation ◽  
Aircraft Engine ◽  
Exhaust Gases

scholarly journals Features of drying of mull sewerage deposits with the help of environmental energy

2020 ◽  
pp. 59-70
Author(s):  
V. Kremnyov ◽  
◽  
N. Korbut ◽  
K. Pianyh ◽  
О. Shelimanova ◽  
...  
Keyword(s):  
Cooling System ◽  
Combustion Engine ◽  
Raw Material ◽  
Electric Heater ◽  
Exhaust Gases ◽  
Circulating Water ◽  
Multi Stage ◽  
Gas Generators ◽  
Technical Solutions ◽  
Specific Amount

Analysis of sludge deposits formed during wastewater treatment gives grounds to evaluate them as a valuable raw material for obtaining biomineral fertilizers. Researcher’s efforts are focused on finding new innovative technical solutions and environmentally friendly approaches in order to make these technologies economically viable. The purpose of this study is to obtain reliable experimental data that will form the basis for a multi-stage technology for the disposal of sludge deposits. A method of combined drying is proposed, in which both the energy of the environment (solar energy) and the energy of secondary energy resources: the heat removed by the cooler from the gasification chambers and the enthalpy of the exhaust gases of gas piston engines - are simultaneously used. The real installation is equipped with a "warm floor" of pipes, in the inner space of which heated circulating water circulates from the cooling system of gas generators. In the experimental setup, the "warm floor" is modeled using a special flat, controlled electric heater. Experiments carried out with a round-the-clock supply of heat from circulating water at a temperature of 40 °C indicate that the use of a "warm floor" can increase the specific amount of moisture removed from the material during the day, almost twice. When constructing a pilot industrial dryer, it is advisable to equip it with a "warm floor" with an additional source of thermal energy, which can be used as the heat of the ground, as well as the heat of high-temperature exhaust gases of an internal combustion engine.

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