Sectional Gas Recirculation

The concept of selective recycling technique is based on a local suction of the sinter waste gas under the strand and its local recycling above the bed. This selective suction and recycling points is the main differecen between this and emissions optimized sintering. Advantages of this system over conventional gas recycling includes: Effective utilization of unused oxygen in the waste gas,  and; separate treatment of the waste gas from different sections according to the composition of gas.
 

Development Status Products
Commercial
sinter

Sectional Gas RecirculationCosts & Benefits

Parent Process: Sinter Plant
Energy Savings Potential

A 92 MJ/t-sinter energy saving was achieved - as compared to a system with desulphurization plant), corresponding to 6% reduction in coke consumption. Electricity consumption increases due to additional fans.
CO2 Emission Reduction Potential

A slight decrease in NOx emissions of about 3% is reported.
Costs

European investment costs for the gas recycling system were quoted at €8-10 million in 1997, excluding deNOx, deSOx and other abatement equipment (IPPC, 2012. p. 180)

Sectional Gas RecirculationSchematic

Sectional Gas Recirculation Reference Documents

Best Available Techniques Reference Document for Iron and Steel Industry

Date: 

2012

Format: 

PDF

Type: 

Reference Documents

This reference document is published by the European IPPC Bureau, and provides detailed information on best available tecnologies applicable to iron and steel plants. 

http://eippcb.jrc.es/reference/BREF/IS_Adopted_03_2012.pdf

Page Number: 

180