Design And Optimization Of Heat Pipe Heat Exchanger For Waste Heat Utilization Of Flue Gas

As the electrolytic aluminum technology is limited, plenty of smoke or gas will be exhausted continuously in the process of electrolysis craft in the electrolytic aluminium plant. Currently in most of the electrolytic aluminium plants, these energy of high quality in low temperature and in quantity are discharged in to the air directly, which not only causes waste of energy, but increases the contaminating to the surrounding environment. It is urgent to recycle this potential energy via suitable heat exchange equipment and systems, which not just responds the policy of energy saving and emission reduction in our country, and furthermore reduces the production cost of electrolytic aluminium enterprise.This paper first studies the current situation on emissions and recycling of aluminum electrolysis gas in the electrolytic aluminium plant in our country on-the-spot based on the practical engineering. The current situation of waste heat recovery in the electrolytic aluminium plant in our country has been analyzed emphatically. The state of research and development on heat recovery of the electrolytic aluminium in domestic and overseas has been referred and then we discussed the pros and cons of waste heat recovery in different scheme and on this basis an original solution of heat pipe exchanger was drawn up for the heat recovery. According to the system scheme, a test-bed of gravitative heat pipe was built up for performance test. Experiments with different working medium(methanol, acetone and normal hexane) under conditions of different filling ratio(20%,30%,35%,42%,50%,60%,70%) are conducted and tested. It can be concluded that gravitative heat pipe filled with acetone is best on the aspect of isothermal characteristic and the optimal liquid filling ratio is 35%. The result of our study is useful to provide reliable test parameters for practical engineering project using gravitative heat pipes.