ArcelorMittal Ostrava Completes Desulfurization of Coke Plant
A hydrogen sulfide scrubber and a mechanical cooling system at the total cost of CZK 226 million were put into operation at its coke plant. The state-of-the-art equipment has just gone through two weeks’ guarantee test. The test has shown a reduction of sulfane contents in the treated coke oven gas to a level below the range of the future European limit of 300 to 1,000 mg/m3. Thanks to the cleaner gas, which is used as a fuel for the plant, the company will reduce its yearly SO2 emissions by more than 200 tonnes.
The construction took two years without ArcelorMittal Ostrava limiting coke production or increasing its environmental impact. The project was divided into two stages in order to maintain the production volume. At first the cooling capacity of coke oven gas treatment was increased and subsequently, the hydrogen sulfide scrubber was replaced by a more powerful and efficient one. This was followed by the installation of a mechanical cleaning. The second stage was completed as fast as within seven months.
The project was completed in August and was followed by trial operation including the final guarantee test, which has confirmed the high efficiency of the coke oven gas cleaning and cooling. “The test was conducted by an authorized agency at the supervision of our experts. It confirmed the expected performance and efficiency of the new coke oven gas desulphurization system,” says Václav Habura, ArcelorMittal Ostrava coke oven plant director.
“The measured sulfane content values are below 300 mg/m3, which is the lower limit of the range based on the best available techniques to be introduced in the EU in 2016,” added Petr Baranek, chief green officer of ArcelorMittal Ostrava, explaining the positive effect on environment. The project will reduce the sulfur dioxide emissions generated by coke oven gas combustion.
Coke oven gas is used by the company as a fuel for most of its plants. It is used, for example, for coke oven battery heating, heating of air flow on blast furnaces, in boilers of the power plant or at the rolling mills. All of these processes include combustion of the cleaned coke oven gas, the reduced sulfur content of which will result in considerably lower sulfur dioxide emissions into the atmosphere. The average yearly SO2 emissions from coke oven gas combustion will drop by 200 tonnes, i.e. 40 %.
ArcelorMittal Ostrava operates two types of coke oven batteries: two stamp-charged batteries and one large-capacity top-charged battery. The plant´s annual coke output is about 1.2 million tonnes making ArcelorMittal Ostrava the biggest coke producer in the Czech Republic.
ArcelorMittal Ostrava a.s. is the largest steelmaker in the Czech Republic and part of the world's largest steel and mining group ArcelorMittal. It has an annual production capacity of 3 million tonnes of steel. Besides the Czech market, the company sells its products to more than 40 countries around the world. ArcelorMittal Ostrava and its subsidiaries employ more than 7500 people. Average income of its employees amounted to 34,213 CZK in 2012. ArcelorMittal Ostrava produces iron and steel in compliance with all environmental legislation. It already conforms to the EU best available techniques (BAT) emission limits that will come into force in 2016. The sole shareholder is ArcelorMittal Holdings A.G.