http://www.epa.gov/nsr/ghgdocs/ironsteel.pdf
Heat Recovery from Cooling Water
When ejected, the rolled steel is cooled by spraying water at a temperature of 80°C. Waste heat can be recovered from the cooling water of the hot strip mill. With the installation of an absorption heat pump low pressure steam (at 1.7-3.5 bar, 130°C) is produced in a site in Netherlands.
This technology is already used in some of the Chinese and Indian plants, but holds a high potential for further diffusion, particularly if the steam can be used on-site.
| Development Status | Products |
|---|---|
|
Commercial
|
Heat Recovery from Cooling WaterCosts & Benefits
| Parent Process: Rolling Mills | |
|---|---|
| Energy Savings Potential |
Energy savings of 0.0 GJ/t-rolled steel is estimated by the implementation of the technology, with an increase of 0.17 kWh/t in electricity consumption (Worrell et al., 2010. p. 104). |
| CO2 Emission Reduction Potential |
Emission reductions are estimated at 1.9 kg CO2/t-rolled steel (US EPA, 2010. p.10). |
| Costs |
Retrofit Capital Cost is $1.3/t-rolled steel. Operation and maintenance costs can increase by $0.11/t-product (US EPA, 2010. p. 29). |
Heat Recovery from Cooling Water Publications
Available and Emerging Technologies for Reducing Greenhouse Gas Emissions from the Iron and Steel Industry
Page Number:
10, 29
Energy Efficiency Improvement and Cost Saving Opportunities for the U.S. Iron and Steel Industry
The U.S. Environmental Protection Agency’s (EPA) energy guide, Energy Efficiency Improvement and Cost Saving Opportunities for the U.S. Iron and Steel Industry, discusses energy efficiency practices and technologies that can be implemented in iron and steel manufacturing plants. This guide provides current real world examples of iron and steel plants saving energy and reducing cost and carbon dioxide emissions.
http://www.energystar.gov/ia/business/industry/Iron_Steel_Guide.pdf?25eb-abc5
Page Number:
104