Division 49

BAT for the coke oven underfiring is to reduce the emissions by using the following techniques:

1. I..

   preventing leakage between the oven chamber and the heating chamber by means of regular coke oven operation

2. II..

   repairing leakage between the oven chamber and the heating chamber (only applicable to existing plants)

3. III..

   incorporating low-nitrogen oxides (NO_X) techniques in the construction of new batteries, such as staged combustion and the use of thinner bricks and refractory with a better thermal conductivity (only applicable to new plants)

4. IV..

   using desulphurised coke oven gas (COG) process gases.

The BAT-associated emission levels, determined as daily mean values and relating to an oxygen content of 5 % are:

• sulphur oxides (SO_X), expressed as sulphur dioxide (SO₂) < 200 – 500 mg/Nm³

• dust < 1 – 20 mg/Nm^{3 f1}

• nitrogen oxides (NO_X), expressed as nitrogen dioxide (NO₂) < 350 – 500 mg/Nm³ for new or substantially revamped plants (less than 10 years old) and 500 – 650 mg/Nm³ for older plants with well maintained batteries and incorporated low- nitrogen oxides (NO_X) techniques.