A Study on the Expansion of the Effective Treating Zone in a Fluidized Bed Furnace

• Main Authors: Lin,Yu Chau, 林于超
• Other Authors: Chen, Fan Shiong
• Format: Others
• Language: en_US
• Published: 1993
• Online Access: http://ndltd.ncl.edu.tw/handle/64092360594465517370

碩士 === 大同工學院 === 材料科學(工程)研究所 === 81 === It is a trend that the fluidized bed technique has been recently applied in heat treatment industry,however, the appli- cation of fluidized bed furnace in Taiwan is not popular as in some foreign countries,it may due to the reasons as follows: firstly, the gas consumption is far beyond the treating cost in domestic market,and secondly,the unstable atmosphere composition between the lower and upper positions of the fluidized bed on account of direct boosting of the fuel gas and air/nitrogen from bottom of the bed,in consequence narrowing the effective treating zone of the bed,and because of the fluctuation of the atmosphere composition,the carbon potential of the carburizing atmosphere is very difficult to control. This project is aimed to improve the stability of the carbu- rizing atmosphere by adopting the following methods: 1.Reduce the carbon potential gradient of the bed by applying a back pressure in virtue of adjusting the opening of the exhaust stack,so as to reduce the trapped air. 2.Equalize the carbon potential of the bed by feeding the enrich gas into the venting end. 3.By using the methods above accompanied with the gas recircula- tion system control the carbon potential of the atmosphere.