蓄热体余热回收换热器强化传热数值模拟

Numerical Simulation of Regenerator Heat Transfer of Waste Heat Recovery in Enhanced Heat Exchanger

利用高温空气燃烧技术的原理,建立了蜂窝陶瓷蓄热体的传热数学模型;通过数值模拟对蜂窝陶瓷蓄热体和蓄热室的结构和操作参数进行优化,提高蜂窝陶瓷蓄热体的余热回收效率。应用流体力学软件CFD模拟蜂窝陶瓷蓄热体在稳定工况下的传热特性及流动特性。研究表明:蜂窝陶瓷从300 K开始工作,到稳定工作状态要经历一个启动过程,冷态到热态时,预热空气温度和排烟温度不断升高直至达到稳定状态;蜂窝陶瓷温度分布的等温线为水平线分布,中间气体等温线为抛物线分布;蜂窝陶瓷处于静止状态,气体速度分布的等速线为抛物线分布;压力分布等压线呈水平线分布。

The principle of using high-temperature air combustion technology,a mathematical model of heat transfer honeycomb ceramic regenerator is established.Through numerical simulation and optimization of honeycomb ceramic regenerator structure and operating parameters,the paper improve the efficiency of waste heat recovery ceramic honeycomb regenerator.By applying CFD,cellular ceramic regenerator heat transfer characteristics in a stable condition and flow characteristics are simulated.In the process,the honeycomb ceramics starts from 300 K,to reach steady working state.It is a boot process that the experiment starts from cold to hot,air preheated temperature and exhaust gas temperature are maintained until it reaches steady state.The distribution of honeycomb ceramics temperature is a horizontal distribution,and the intermediate gas isotherm is paraboli.Ceramic honeycomb is in a quiescent state,the constant velocity of the gas velocity distribution line is also parabolic distribution.Pressure distribution isobars is horizontal distribution.