CAJ | 학술논문

为研究列管式固定床反应器壳程内换热介质的流动与传热特性,采用数值模拟的方法求解得到壳程流体速度与温度分布场.模拟结果受湍流模型影响,将壳程传热膜系数和压降的CFD模拟结果与经验方法结果进行比较后选择偏差最小的realizable k-ε湍流模型.模拟结果显示换热介质在反应器壳程内的流动与传热分布不均匀,折流板前背部存在漩涡和传热死区,错流区和折流板缺口区的传热效果较好.为验证CFD模拟结果的可靠性,将不同传热量和进口流量条件下的模拟结果与经验方法结果进行比较,偏差在可接受范围内.
위연구렬관식고정상반응기각정내환열개질적류동여전열특성,채용수치모의적방법구해득도각정류체속도여온도분포장.모의결과수단류모형영향,장각정전열막계수화압강적CFD모의결과여경험방법결과진행비교후선택편차최소적realizable k-ε단류모형.모의결과현시환열개질재반응기각정내적류동여전열분포불균균,절류판전배부존재선와화전열사구,착류구화절류판결구구적전열효과교호.위험증CFD모의결과적가고성,장불동전열량화진구류량조건하적모의결과여경험방법결과진행비교,편차재가접수범위내.
The numerical simulation method (commercial CFD code) was used to investigate the fluid flow and heat transfer inside the shell side of multitubular fixed bed reactor. It was found that the simulation results are sensitive to the turbulence model selection, and realizable k-εmodel was considered as the best turbulence model by comparing the CFD results of heat transfer coefficient and pressure drop with empirical method results. The simulation results show that the velocity and temperature distribution vary along axial and radial direction, and there are stagnation regions before and behind the baffles, in which the heat transfer coefficient is low;but high heat transfer was observed in cross flow zones and baffle cut zones. Finally, the validity of the CFD results was confirmed by comparing its results of outlet temperature, total pressure drop and average heat transfer coefficient with empirical method results under different heat flux and inlet velocity conditions. The calculating results have a good agreement with the results of empirical methods.