In Japanese plants 120 and 170 kg steam at 20 atm (equaling 0.34 GJ/t-sinter and 0.48 GJ/t-sinter) are recovered from sinter coolier and sinter machine proper, respectively. Electricity production from these units were 20kWh/t-sinter and 30 kWh/sinter, respectively (JASE-W, 2012)
Fuel savings up to 0.55 GJ/t-sinter, and increased electricity generation of 1.4 kWh/t-sinter are reported from a retrofitted plant in Netherlands (US EPA, 2010. p. 13)
http://www.epa.gov/nsr/ghgdocs/ironsteel.pdf
Waste Heat Recovery in Sinter Plant
In a sinter plant, sensible heat can be recovered both from the exhaust gases of the sinter machine and the off-air of the sinter cooler. Heat recovery can be in different forms:
- Hot air streams both from sinter machine and the sinter cooler can be used for the generation of steam with the installation of recovery boilers. This steam can be used to generate power or can be used as process steam. For inreased heat recovery efficiency, a high-temperature exhaust section should be separated from a low-temperature exhaust section and heat should be recovered only from high-temperature exhaust section.
- Sinter machine exhaust can be re-circulated to the sinter machine, either after going through a heat recovery boiler or without it.
- Heat recovered from the sinter cooler can be recirculated to the sinter machine or can be used for preheating the combustion air in the ignition hood, for pre-heating of the raw mix to sinter machine. It can also be used to produce hot water for district heating.
This technology is regarded to have high application potential for China, India, and the US.
| Development Status | Products |
|---|---|
|
Commercial
|
Waste Heat Recovery in Sinter PlantCosts & Benefits
| Parent Process: Sinter Plant | |
|---|---|
| Energy Savings Potential |
Steam generation of 0.25 GJ/t-sinter is reported in other Japanese plants (NEDO, 2008)
|
| CO2 Emission Reduction Potential |
CO2 reductions will result due to reduced fuel consumption in the sinter machine and/or for electricity production. |
| Costs |
Reported retrofit capital costs vary between $3/t-sinter (APP, 2010. p.17) to $4.7/t-sinter (US EPA, 2010. p.13). This technology is regarded to have payback times in the range of 3 to 5 years. |
Waste Heat Recovery in Sinter PlantSchematic
Waste Heat Recovery in Sinter Plant Publications
Available and Emerging Technologies for Reducing Greenhouse Gas Emissions from the Iron and Steel Industry
Page Number:
9, 13
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:
76
Waste Heat Recovery for Sinter Plants
Date:
2012
Format:
PDF
Type:
Publications
This information leaflet from Japanese Business Alliance for Smart Energy worldwide (JASE-W), provides information on the waste heat recovery systems applied to sinter plants in Iron making.
http://www.jase-w.eccj.or.jp/technologies/pdf/iron_steel/S-01.pdf
Global Warming Countermeasures: Japanese Technologies for Energy Savings / GHG Emissions Reduction
Date:
2008
Source:
Format:
PDF
Type:
Publications
This revised 2008 version of the publication from New Energy and Industrial Technology Development of Japan includes information on innovative Japanese technologies for energy efficiency and for the reduction of CO2 emissions.
Page Number:
65
The State–of-the-Art Clean Technologies (SOACT) for Steelmaking Handbook
Date:
Dec
2010
Source:
Format:
PDF
Type:
Publications
The State–of-the-Art Clean Technologies (SOACT) for Steelmaking Handbook is developed as part of the Asia-Pacific Partnership on Clean Development and Climate program and seeks to catalog the best available technologies and practices to save energy and reduce environmental impacts in the steel industry. Its purpose is to share information about commercialized or emerging technologies and practices that are currently available to increase energy efficiency and environmental performance.
http://asiapacificpartnership.org/pdf/Projects/Steel/SOACT-Handbook-2nd-Edition....
Page Number:
17