By using heat exchangers it is possible to reuse waste heat which is discarted by industrial plants into the environment. The heat lost represents an enormous economic and ecological damage. The heat losses suffered from the leakage of warmed fluids into the environment can be minimized with the use of heat exchangers. Heat exchangers need to be properly selected and sized in order for the investment to be financially viable.
In the steel company SIJ Acroni d. o. o., Slovenia's largest steelmaker, uses the furnace RUST to preheat slabs before rolling. The oven, which operates continuously, virtually 365 days a year, 24 hours a day, is the largest gas consumer in the company. The heat lost by the furnace through the flue gas is recovered by the KEU GmbH tube recuperator. The last reconstruction of the furnace in 2006 and 2007 did not improve the performance of the recuperator, despite the improvement of the furnace characteristics. Therefore, the aim of the thesis was to make a control calculation for KEU GbmH recuperator using literature data. The recuperator was calculated for two cases, namely, the minimum and maximum measured temperatures of the flue gases entering the recuperator. The difference between higher and lower temperatures in the flue gas recuperator did not cause significant differences in dimensional requirements.
The thesis presents the use of heat exchangers and the division of heat exchangers into useful cathegories. What follows is the presentation of the RUST furnace and the KEU GbmH recuperator.
|
