Improved atmosphere circulation in pit furnaces
Pit-type furnaces often use lid mounted fans to circulate the atmosphere gases. At best they are inefficient and need an inner liner which takes up valuable space. Gas velocities can be low leading to poor carburising uniformity. At worst they are prone to frequent failure and are expensive to maintain. CARBOJET is a CFD optimised system which uses the free energy available from vaporising liquid nitrogen to carry out the task of circulating the atmosphere. The high nitrogen pressure available is utilised to drive a special designed injector inside the furnace. The increase in circulation achieved by this injection can results in improved uniformity and/or time saving in surface reactions like carburising. In this paper the effectiveness of the system is illustrated with particular reference to a pit furnace used to carburise loads of 80 6.5m long x 50mm diameter tubes at 925°C. Both CFD and practical trial results are presented showing that significant savings can be made while improving quality.
atmospheres circulation CFD atmosphere uniformity
Edward Feng Pierre Foret Akin Malas Christoph Laumen Paul Stratton
Linde Gas, Shanghai, China Linde Gas, Unterschleifiheim, Germany Matscribe UK, Bingley, UK
国际会议
北京
英文
85-87
2012-10-23（万方平台首次上网日期，不代表论文的发表时间）