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. 

Chinese flag Indian flag 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

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.

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104