Injection of Coke Oven Gas

Coke oven gas (COG) can also be as a reductant in blast furnace. While also reducing the consumption of coke or other reductants, the technology can cut down absolute CO2 emissions from the blast furnace. Using COG in BF, rather than other purposes may also reduce the SO2 emissions. The maximum level for COG injection at the tuyère level is thought to be 0.1 t/t-HM hot metal, and injection rates of 47 kg/t-HM have already been practiced. Use of COG in BF requires extra oxygen to be supplied and when COG is used in BF, a need to find substitutes for its conventional use areas - e.g. reheat furnaces -  arises. The use of COG requires a compressor unit, increasing the power consumption.  Analysis indicated that Pulverized Coal Injection leads to higher energy effectiveness than that of coke oven gas.

Development Status Products
Commercial
iron

Injection of Coke Oven GasCosts & Benefits

Parent Process: Blast Furnace System
Energy Savings Potential

The replacement rate of COG is about 1.0 ton of gas for 0.98 ton of coke.

EU Flag Since 2002, a plan in Austria has operated their small blast furnaces with a simultaneous injection of reduction gas and heavy fuel oil as standard operational procedure with a replacement of 70 % of the heavy fuel oil by COG. In 2004, these furnaces averaged an oil injection rate of 45.5 kg/t-HM and a COG rate of 46.9 kg/t-hot metal with a total equivalent coke rate of 477.8 kg/t hot metal.
CO2 Emission Reduction Potential

EU Flag Emission reductions due to replaced coke (0.98t-coke/t-COG) and reduced flaring of COG will arise.
Costs

EU Flag The investment at the Austrian plant for the gas injection plant was about €10 million for a production of about 5000 t-HM/day. The total specific operational costs are: €1.3/t-HM or €12/1000 m3 COG (€2 400 000/year and 200 million m3 COG/year).
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Injection of Coke Oven GasSchematic

Injection of Coke Oven Gas Reference Documents

Best Available Technique (BAT) Reference Document for Iron and Steel Production

Date: 

Mar
2013

Source: 

Integrated Pollution Prevention and Control Directive

Format: 

PDF

Type: 

Reference Documents

Published by the Joint Research Center of Institute for Prospective Technological Studies (IPTS), that is part of European Commision, this reference document provides detailed information on the Best Available Technologies (BAT) applicable to the iron and steel manufacturing.

http://eippcb.jrc.ec.europa.eu/reference/BREF/IS_Adopted_03_2012.pdf

Page Number: 

343-344

Injection of Coke Oven Gas Resources

Comparison between Gas and Oil Injection into the Blast Furnace: a Detailed Theoretical Study

Date: 

May
2012

Format: 

PDF
http://www.processeng.biz/docs/gas_oil_AIST2004_Presentation.pdf

Page Number: 

4