II. INDUSTRIAL WASTE HEAT | APPLICATION EXAMPLES | STEEL INDUSTRY
Steel production is highly energy intensive and accordingly generates large amounts of heat which is typically wasted in the environment. Several different processes can support a waste heat recovery unit based on a Turboden ORC. Recovering heat for electricity generation with Turboden ORC units can increase process efficiency, lower energy costs, and reduce the carbon footprint in a steel plant.
| Exhaust gas streams |
| Rolling | Forging |
› Relatively clean exhaust gas at moderate temperature
|
| Strip processing |
| Heat treatment |
Cost effective for ORC ≥ 600/800 kWe; |
| BOF |
› High flows, temperatures and dust content
› Large variations in operating cycle
|
| Blast furnaces |
| Sinter |
Interface between process and energy recovery unit is critical |
| Electric Arc Furnace |
ORCs proposed where heat recovery exchangers are available |
Electric Arc Furnace
› 25 - 30% of the energy input in the furnace is lost in the exhaust
› 70% of the lost power could be recovered
› Target output: 3 - 5% of the EAF installed power
| Steel plants | Turboden References |
| Description |
Steel Rolling Mill |
Electric Arc Furnace |
| Location |
Singapore |
Riesa | Germany |
| Customer |
Natsteel | Tata Group |
ESF Elbe Stahlwerke Feralpi GmbH |
| Heat source |
Exhaust gas @ 400°C |
Exhaust gas from EAF |
| ORC electric power |
ca. 0.7MWe |
2680 kW |
For more details and project photos click here 