Reactor models were developed to describe the isomerization reaction process of C_(8) aromatics by applying a six-component sequential reaction network.Lab-scale experimental data were used in an axial bed reactor mod...Reactor models were developed to describe the isomerization reaction process of C_(8) aromatics by applying a six-component sequential reaction network.Lab-scale experimental data were used in an axial bed reactor model,and dynamic parameters were fitted by simulated annealing algorithm.In addition,industrial data and calculated dynamic parameters were used to determine the six-component concentration distributions using a radial reactor model.The influence of back-mixing on reaction performance was investigated.It was found that the model considering back-mixing was much closer to the real industrial reaction process.展开更多
The concept of travelling wave reactor(TWR)applies the mechanism of self-sustaining and propagating nuclear fission travelling waves in fertile media of 238U and 232Th to achieve very high fuel utilization.Based on th...The concept of travelling wave reactor(TWR)applies the mechanism of self-sustaining and propagating nuclear fission travelling waves in fertile media of 238U and 232Th to achieve very high fuel utilization.Based on this concept,a stepwise radial fuel shuffling strategy was proposed and applied to a sodium-cooled fast reactor(SFR)loading metallic 238U fuel.The multi-group deterministic neutronic code ERANOS with JEFF3.1 data library was used as a basic tool to perform the neutronics and burnup calculations.The inward fuel shuffling calculations were first performed in a 1-D cylindrical case for parametric understanding,and then extended to a 2-D R-Z case.The shuffling calculations for the 1-D and 2-D SFR model yielded some interesting results.The asymptotic keff varied parabolically with the characteristic fluence,while the burnup increased linearly.The highest burnup achieved in 2-D case was 38%.The power peak shifted from the fuel outlet side(core centre)to the fuel inlet side(core periphery)in both 1-D and 2-D cases and the corresponding peaking factor decreased dramatically along with the characteristic fluence.The present research demonstrated that the proposed stepwise radial fuel shuffling in the sodium fast reactor achieved the characteristics of the traveling wave reactor.展开更多
采用计算流体力学方法,从计算流体力学的基本方程出发,引入孔隙率和阻力系数,建立径向固定床反应器内流体流动的数学模型。在计算流体力学商业软件 FLUENT6.1上,对4种流动类型径向流固定床反应器内流场进行了数值模拟研究,得到了固定床...采用计算流体力学方法,从计算流体力学的基本方程出发,引入孔隙率和阻力系数,建立径向固定床反应器内流体流动的数学模型。在计算流体力学商业软件 FLUENT6.1上,对4种流动类型径向流固定床反应器内流场进行了数值模拟研究,得到了固定床反应器内详细的速度和压力分布情况。模拟结果表明,在径向流固定床反应器中,在床层阻力作用下,大部分气体沿径向方向流过床层,在床层中部速度分布比较均匀。4种流动类型反应器中,离心流动优于向心流动,离心Ⅱ型优于离心 Z 型;向心 Z 型反应器内流体流动的轴向分布最不均匀,其次为向心Ⅱ型、离心 Z 型和离心Ⅱ型,离心Ⅱ型反应器中流体流动分布最均匀。展开更多
文摘Reactor models were developed to describe the isomerization reaction process of C_(8) aromatics by applying a six-component sequential reaction network.Lab-scale experimental data were used in an axial bed reactor model,and dynamic parameters were fitted by simulated annealing algorithm.In addition,industrial data and calculated dynamic parameters were used to determine the six-component concentration distributions using a radial reactor model.The influence of back-mixing on reaction performance was investigated.It was found that the model considering back-mixing was much closer to the real industrial reaction process.
基金supported by the National Natural Science Foundation of China(Grant No.11105103)the Doctoral Fund of the Ministry of Education of China(Grant No.20110201120046)
文摘The concept of travelling wave reactor(TWR)applies the mechanism of self-sustaining and propagating nuclear fission travelling waves in fertile media of 238U and 232Th to achieve very high fuel utilization.Based on this concept,a stepwise radial fuel shuffling strategy was proposed and applied to a sodium-cooled fast reactor(SFR)loading metallic 238U fuel.The multi-group deterministic neutronic code ERANOS with JEFF3.1 data library was used as a basic tool to perform the neutronics and burnup calculations.The inward fuel shuffling calculations were first performed in a 1-D cylindrical case for parametric understanding,and then extended to a 2-D R-Z case.The shuffling calculations for the 1-D and 2-D SFR model yielded some interesting results.The asymptotic keff varied parabolically with the characteristic fluence,while the burnup increased linearly.The highest burnup achieved in 2-D case was 38%.The power peak shifted from the fuel outlet side(core centre)to the fuel inlet side(core periphery)in both 1-D and 2-D cases and the corresponding peaking factor decreased dramatically along with the characteristic fluence.The present research demonstrated that the proposed stepwise radial fuel shuffling in the sodium fast reactor achieved the characteristics of the traveling wave reactor.
文摘采用计算流体力学方法,从计算流体力学的基本方程出发,引入孔隙率和阻力系数,建立径向固定床反应器内流体流动的数学模型。在计算流体力学商业软件 FLUENT6.1上,对4种流动类型径向流固定床反应器内流场进行了数值模拟研究,得到了固定床反应器内详细的速度和压力分布情况。模拟结果表明,在径向流固定床反应器中,在床层阻力作用下,大部分气体沿径向方向流过床层,在床层中部速度分布比较均匀。4种流动类型反应器中,离心流动优于向心流动,离心Ⅱ型优于离心 Z 型;向心 Z 型反应器内流体流动的轴向分布最不均匀,其次为向心Ⅱ型、离心 Z 型和离心Ⅱ型,离心Ⅱ型反应器中流体流动分布最均匀。
