热力发电2025，Vol.54Issue(3)：69-78,10.DOI:10.19666/j.rlfd.202407201
低压CO2/H2O管束外凝结换热数值模拟
Numerical simulation of condensation heat transfer outside low pressure CO2/H2O horizontal tube bundle
摘要
Abstract
Carbon capture and storage is an important way to achieve the"dual-carbon"goal.The exhaust gas of the supercritical water-coal to hydrogen coupled CO2/H2O mixed working medium thermal power generation system is low pressure and low-temperature CO2/H2O mixed gas.In order to achieve zero carbon emission and heat recovery,condensation separation of CO2/H2O is a necessary way.Fluent is used to simulate the condensing heat transfer characteristics of CO2/H2O mixture outside the horizontal bifurcation tube bundle.The volume of fluid(VOF)model,the component transport model,and the phase transition model written by the user-defined functions(UDF)are employed to load the mass,energy,and component source terms of the two-phase flow.The formation and development process of the liquid film on the wall surface,and the distribution of streamlines,velocity vectors,and liquid-phase volume fractions in the vicinity of droplets,as well as the effects of velocity,vapor superheat,and noncondensable gas content on the heat transfer coefficients and the thermal resistance of the diffusion layer,are investigated.The results show that,the simulation results are in agreement with the experimental data,and the liquid film thermal resistance hardly varies with the steam superheat but decreases with the increase of CO2 content,inlet flow rate and total pressure.The thermal resistance of the mixed gas diffusion layer increases with the CO2 content and steam superheat,and decreases with the increase of inlet flow rate.The total heat transfer coefficient increases with the steam superheat,inlet flow rate and pressure,and decreases with the CO2 content,and the local condensation heat transfer coefficient is negatively correlated with the liquid film thickness.A new dimensionless correlation formula for heat and mass transfer of condensation is proposed for low pressure CO2/H2O condensation process.关键词
数值模拟/CO2/H2O混合气/低压/叉排管束/凝结换热Key words
numerical simulation/CO2/H2O mixture gas/low pressure/forklift tube bundle/condensation heat transfer引用本文复制引用
曹凤岩,鲁军辉,陈红兵,王岩,王随林..低压CO2/H2O管束外凝结换热数值模拟[J].热力发电,2025,54(3):69-78,10.基金项目
国家自然科学基金项目(52406063) （52406063）
北京学者计划项目(2015022) （2015022）
北京市教育委员会科研计划项目(KM202310016006)National Natural Science Foundation of China(52406063) （KM202310016006）
Beijing Scholars Program(2015022) （2015022）
Beijing Municipal Education Commission(KM202310016006) （KM202310016006）
