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VERSION:2.0
METHOD:PUBLISH
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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 5
SUMMARY:Results of two years’ operating experience of an ORC plant capturing waste heat in a steel mill
DESCRIPTION:Gas prices in Europe will remain on a high level. Therefore, any gas fired process should be examined in regard to energy efficiency measures. Gas fired ovens are widely used in the steel industry. Very often the temperature of the exhaust gas at the stack is still in the range of 300 °C to 600 °C. The so called high-temperature ORC technology is an ideal tool to make use of that waste heat.
Taking the example of an innovative ORC system installed at the site of a German steel mill, the lecture will present the achievements and challenges of two years of operation. In this project, the residual heat of the exhaust gases of a walking beam furnace is transferred in one-step to the ORC working media by using direct evaporation technology. As a consequence of capturing the thermal energy at high temperature levels of around 450 °C, the water-cooled condenser of the ORC system can be operated at an elevated temperature of up to 90 °C. The ORC system provides a two-fold benefit to the Customer. The turbogenerator feeds up to 500 kW electric power to the factory and, thus, reduces the expenses for purchasing power from the grid. Moreover, the ORC system transfers around 2.3 MW of heat to a district heating network. 
After commissioning in July 2020, the plant has been running several thousand operating hours. The presentation analyzes operating data and compares it to the project targets. Further explanations are given how the ORC system is integrated into the operational regime of the gas-fired walking-beam furnace. Finally, an exemplary economic calculation provides insights to the business case and highlights the benefits of an investment into a high-temperature ORC system as an energy efficiency measure: CO2 reduction, income from electricity produced, income from secondary thermal energy provided.
 
CLASS:PUBLIC
DTSTART:20230615T090000
DTEND:20230615T092000
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