Optimization On Temperature Uniformity In A Baking Finish Furnace Of The Enameled Wire

The design and operation of the baking finish furnace of enameled wire rely mostly on experience because of the lack of theory guidance in domestic at present. There’re some problems in production, such as unreasonable heat distribution and uneven distribution of temperature in the baking finish furnace, which results in the high energy consumption and instable quality. A RXHW3600baking finish furnace with catalytic combustion and circulating flow was studied in this dissertation. The problems of the temperature uniformity were systematically researched and the structures of the air uniform device and baffles were optimized numerically. The main contents and conclusions are as follows:(1) The heat balance of the RXHW3600oven was calculated and analyzed. The results show that the heat released by catalytic combustion can fully meet the production of enameled wire. Most heat is released from the oven system through the flue and the thermal efficiency is only20.3%. Some measures to raise the thermal efficiency were proposed. The effective way is to optimize the volume of fresh to reduce the heat loss released through the flue. In addition, some heat released by catalytic combustion can be derived to preheat the mixed gas before the electric heating chamber, which can substitute for some or a part of electric heat.(2) Mathematical model was established by using standard κ-ε turbulence model and P-1radiation model. The mathematical model was verified on the situation of cold state. The results indicate that the average error is4.1%and3.0%when the circulating flow is1782m3/h and1540m3/h respectively, which proves that the model is reliable.(3) Flow and heat transfer mathematical model was conducted to analyze the temperature uniformity of the RXHW3600baking finish furnace. It was found that the temperature varies greatly along the width direction in the baking finish furnace, and the maximum temperature difference is15.2K. Usually, the temperature difference has to be kept within5K along the width direction in production process of enameled wire, so the structure of air duct must be optimized. (4) The influence of the baffle structure of the air uniform device, the baffle structure of the branch channel, the clapboard in the oven and the guide baffle before the branch channel on temperature uniformity along the width direction in the baking finish furnace was simulated and analyzed, and the structures were optimized. Reasonable structures were produced.The reasonable width and height of the baffle of the air uniform device is1520mm and420mm respectively. The baffle structure of the branch channel is of benefit to temperature uniformity, but the clapboard in the oven is bad for the temperature uniformity. The maximum temperature difference along the width direction is4.3K when the structrue of guide baffle before the branch channel is optimal, which satisfies the production requirement of the enameled wire.The maximum temperature difference along the width direction is reduced by10.9K compared with the original model. Optimization results can provide guidance for design and operation of the baking finish furnace of enameled wire.50figures,23tables,64references.