Method of reducing the emission of nitrogen oxides from coke ovens

Jan KAPAŁA – Institute of Environmental Protection and Engineering, University of Bielsko-Biala, Bielsko Biała, Poland; Krzysztof KLEJNOWSKI – Institute of Environmental Engineering, Polish Academy of Sciences, Zabrze, Poland; Krzysztof KOWOLIK – ArcelorMittal Poland S.A., Branch in Zdzieszowice, Poland; Czesław OLCZAK* – Environmental Engineering CARBOCHEM Opole, Poland
Please cite as: CHEMIK 2016, 70, 10, 597–604

The production of coke in coke oven batteries is related to the emission of substances into the air, including the emission of nitrogen oxides [1]. Nitrogen oxides may constitute 16 to 41% of the total emission of substances from coke oven batteries [2].

The combustion of coke gas in the battery heating system called the coke-oven battery firing is the main source of the emission of nitrogen oxides NOx from the coke-oven battery [1].

Carbonization of hard coal consists in its degassing by preventing the air flow into the coke ovens at a temperature of ca. K. The coke oven consists of a horizontal coking chamber, indirectly heated by combusting coke oven gas in the heating walls. A set of alternately situated coking chambers and heating walls forming a compact unit of ovens is called the coke oven battery [6].

In Poland 25 coke oven batteries are operated with a production capacity of 11 million tonnes of coke per year. In the years 1998–2012 the coke oven batteries were technologically modernized in order to reduce emissions [4]. Ten new coke oven batteries were built by using modern carbonization techniques and environmental protection. The remaining 15 coke oven batteries are successively modernized and equipped with devices for air tight sealing or restricting emissions to the air [5].

Environmental requirements for the years 2012–2020 for coking installations were defined in the Directive 2010/75/EU of the European Parliament and of the Council of 24th November 2010 on industrial emissions and in the Commission Implementing Decision of 28th February 2012 establishing BAT conclusions for the iron and steel production [7, 8].

The object of work is the analysis of the effectiveness and availability of methods of reducing the emission of nitrogen oxides from coke oven batteries and, in particular, from the process of combusting coke oven gas in the battery heating system.

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