Sinter Production Technology Using Ignition Hearths of Advanced Construction

The technology allows to reduce gas mixture consumption in ignition hearths by up to 5 - 6,5 kg of equivalent fuel per one ton of sinter and to improve sinter quality.

At present ignition hearths with burners in the front end wall are mostly used in sinter production at metallurgical works.

The technology of sintering mixture heating and ignition is based on the theory of high concentration of heat supply per unit of the sintering mixture surface at the beginning of the hearth's working space and it is considered necessary to provide heating for no less than 50 c, i.e. if the rate of the pallet movement makes 2 m/min. the combustion zone length must make no less than 1,8 m.

The experience of RPC "Donix" experts in the area of retrofit and maintenance of ignition hearths with end burners (confirmed with corresponding thermotechnical calculations) proves that the duration of heating to provide the efficient ignition can be reduced to 15 - 30 c under condition of heat supply with a higher concentration.

The technology allows:

to increase the heat supply rate per unit of the sintering mixture surface up to 2,0 - 2,2 mln. kcal / (m3/h);
to increase the heat stress of the combustion zone volume, which allows to increase the combustion temperature and, as a result, to increase the temperature above the surface and the sintering mixture surface temperature in the torch stroke zone;
to intensify the sintering mixture heating by means of a more concentrated directed torch;
to reduce heat diffusion within the hearth working space and heat loss through the output window.

The system is implemented at the ore mining and processing enterprise of Integrated Metallurgical Works "Krivorozhstal" and is being implemented at the sintering plant of Dneprodzerzhinsk Integrated Metallurgical Works.