Study On Heat Transfer Enhancement About The Regenerator Of Regenerative Heat Exchanger

Energy shortage is greatly concerned by the whole world.Recovery of waste heat is animportant way of energy saving. As an important form，the regenerative heat exchanger iswidely used in industries for its little volume，low cost and high efficiency. The thermalcharacteristics of the regenerator were studied from the point of view of theoretical analysisand numerical simulation. The most energy would be saved by setting different parameters ofstructure and operation.A new type of honeycomb ceramic regenerator with converging-diverging channel waspresented. The correlative information both domestic and abroad was comprehensivelyanalyzed in this paper and research methods about thermal characteristics of the regeneratorwere explored. Flow and heat transfer processes inside regenerators were numerically studiedusing FLUENT. The effect of all parameters on thermal characteristics of the regenerator isresearched synthetically by analyzing distribution of temperature and pressure. The optimumparameters of structure and operation were determined using orthogonal test. Mainconclusions are as follows：1)Typical research methods about thermal characteristics of the regenerator werediscussed and their own application range and features were analyzed. At last， the method ofnumerical simulation was determined. Flow and heat transfer processes inside regeneratorswere studied from the point of view of theoretical analysis and numerical simulation.2)The new type of honeycomb ceramic regenerator with converging-diverging channelwas simulated and was compared with the traditional regenerator. With the same volume， thepressure loss of the new regenerator is higher than the traditional regenerator， but the heattransfer rate can be increased by more than10%and the new regenerator has a20%higherconvective heat transfer coefficient.3)In the paper， treat pressure loss， heat transfer rate and convective heat transfercoefficient as performance indicators of regenerative chamber. The effect of structuralparameters (scaling， datum diameter and height) and operation parameters (water equivalentand the swap time) on performance indicators were discussed， and influence curves wereobtained.4)The values of scaling， datum diameter， entrance velocity and swap time affectingperformance indicators were analyzed. Finally， the optimal scheme with30mm in datum diameter，8m/s in entrance velocity，0.6in scaling and60s in swap time was found.This study provided a new idea for heat transfer enhancement about the regenerator ofegenerative heat exchanger and theory evidences for further studies.