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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 16a
SUMMARY:Effect of PC residues on BF liquid products and dripping behaviour
DESCRIPTION:It is almost impossible for the injected pulverised coal (PC) to be completely converted in the raceway at very high PC injection rates (≥ 200 kg/tHM). Therefore, it is crucial to understand whether the unburnt coal particles (Char) can be converted outside the raceway and, if so, to what extent. The incomplete coal combustion in the raceway leads to a decrease in the blast furnace (BF) productivity and operation efficiency and increases the specific coke rate. RWTH Aachen University intensively studies the properties, the behaviour, and the interaction of char with coke, iron burden, liquids, and gases outside the raceway. This contribution focuses on the fluid dynamics of gas-liquid flow in the dripping zone as well as the char effect on liquid products (hot metal and slag). To investigate these effects, an experimental BF dripping zone setup with ignited coke was developed. Several experiments including a reference test without injection were conducted with variable parameters such as the injected material (char, PC, coke fines), the injection rate, the hot metal temperature, the coke size, and the coke bed height. Thus, it was possible to evaluate the effect of these parameters on char behaviour as well as on static and dynamic holdups. 
In addition, the char effect of slag properties such as viscosity, basicity and melting range was examined using the simulation software FactSage™ and was afterwards compared with experimental measurements.
These experiments and simulations are helpful for BF process monitoring and control as well as further prediction of char behaviour in the BF.


CLASS:PUBLIC
DTSTART:20230615T123000
DTEND:20230615T125000
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