Experimental Research On Heat Pipe Heat Exchanger For Waste Heat Recovery In Iron And Steel Industry

In China,industrial waste heat resources are very rich.If they can be fully recovered and utilized,they can effectively alleviate the current shortage of resources,improve the efficiency of secondary energy utilization,and contribute to the development of energy conservation and emission reduction.Compared with various types of heat exchange equipment,heat pipe heat exchangers are very efficient in heat transfer,simple in structure and safe in operation,so they are widely used in heat recovery.In this paper,a liquid-liquid heat pipe heat exchanger is designed,which can be applied to the blast furnace slag water heat recovery of the iron and steel industry.The heat exchanger has low cost,can adapt to many water qualities,and does not affect industrial manufacturing.On the basis of the research in this paper,companies will spend less cost to effectively extract the waste heat of the cooling water in the steel industry that is currently unrecoverable or difficult to recover,providing conditions for the utilization of waste heat such as heating.This article mainly introduces the design and manufacture of heat pipe heat exchangers for waste heat recovery in the iron and steel industry,builds an experimental platform for the performance test of heat pipe heat exchangers for waste heat recovery in the steel industry,and the performance of the heat pipe heat exchanger An experimental study was carried out.The experiment used a data acquisition system to record the temperature changes of the heat pipe heat exchanger during operation in real time,and the frequency controller was used to control the changes in the flow of cold and hot water.Finally,through data processing,using various evaluation indicators,such as heat exchange amount,efficiency and heat transfer coefficient,etc.,the parameters that can make the operation effect of this heat exchanger best are obtained.Through the research on the performance experiment and evaluation of the heat pipe heat exchanger,the following conclusions are drawn:Under the condition that the flow rate of the cold water on the condensation side of the heat pipe heat exchanger is kept constant,the heat exchange amount,heat transfer coefficient,exergy efficiency and fire accumulation efficiency in each evaluation index increase with the increase of the flow of hot water on the evaporation side Increased,but at the same time,the efficiency decreased as the hot water flow on the evaporation side increased.Conversely,when the optimal solution of the hot water flow on the evaporation side remains unchanged,the efficiency increases with the increase of the cold water flow on the condensation side,and the exergy efficiency decreases first and then increases.The fire efficiency increases first and then decreases.This paper uses the intersection point of the curves of efficiency,exergy efficiency and fire accumulation efficiency to determine the optimal operating flow of the heat pipe heat exchanger designed in this paper.The final result shows that the optimal hot water flow is 1.2m~3/h and the optimal cold water flow is 3.7m~3/h.Through the physical quantity in exergy analysis-the exergy enhancement potential,the theoretical optimization analysis of the heat pipe heat exchanger in this experiment was carried out.The data results show that with the continuous increase of the cold water flow on the condensation side,the exergy enhancement potential continues to increase,It proved that the heat exchanger also has a high optimization space.