Waste Heat Recovery for EAF

This technology aims at recovering the recover the waste heat  from EAF exhaust gases in the form of saturated steam or hot water. It is considered to hold a particularly high potential for EAF operations using primarily DRI. The steam recovered in this manner can be directly used or used according to the purposes such as power generation, sea water desalination, for freezers, air separation, for degasification systems, etc. It is also possible to superheat the steam to enhance the power generation efficiency.

Development Status Products
Research
steel

Waste Heat Recovery for EAFCosts & Benefits

Parent Process: Electric Arc Furnace
Energy Savings Potential

Approximately 130 kWh/t-s of energy can be recovered (efficiency 30%).
If recovered energy is used for power generation with saturated steam 2.8 MWh/y of electricity can be generated.
If the recovered energy is used for power generation with superheated steam,  15.1 MWh/y of energy can be generated.  (For an EAF melting 150 t/charge of DRI with tap-to-tap time of 49 mins, and power on time of 40 mins) (JASE-W, 2012)
CO2 Emission Reduction Potential

If recovered energy is used for power generation with saturated steam, corresponding CO2 emission reduction will be 12,600 t/y;
If recovered energy is used for power generation with superheated steam, corresponding CO2 emission reduction will be 73,400 t/y. (For an EAF melting 150 t/charge of DRI with tap-to-tap time of 49 mins, and power on time of 40 mins) (JASE-W, 2012)
Costs

Waste Heat Recovery for EAFSchematic

Waste Heat Recovery for EAF Presentations

Waste Heat Recovery for EAF

Date: 

2012

Format: 

PDF

Type: 

Presentations

This document from the the Japanese Business Alliance for Smart Energy Worldwide provides details of an emerging technology that allows waste heat recovery from electric arc furnaces in steel milss. 

http://www.jase-w.eccj.or.jp/technologies/pdf/iron_steel/S-05.pdf