7TH EUROPEAN COKE AND IRONMAKING CONGRESS - ECIC 2016

Nowadays the sinter cooler often becomes the limiting factorof the sinter production. Outdated technologyleads tolow productivity and high operation and maintenance cost. This is countered by the two types of coolers developed and offered by Paul Wurth, the annular cooler and the shaft cooler. The classic design of the annular cooler was completely revised and is now essentially composed of a rigid ringframe construction. As opposed to thetraditional design with individual sintering cars, the segments are connected and form a stable ringin which lowerable grids are installed, avoiding the typical problems of centering. Additional features are the low leakage rate and the increased effective cooling surface due to the removal of dead areas. This leads, in addition to the lower weight, to low operating costs and a smaller space requirement. The shaft cooler stands out by an even smaller space requirement and lowersinter outlet temperaturesthrougha longer residence time. Here again the modular design, the standard actuators on the driving ring and the standard conveyor rollers lead to advantages during acquisition, operation and maintenance. The new conical shaft cooler is a development of the shaft cooler towards a pure counter flow cooler aiming at maximizing the energy efficiency. It is designed as a system with a very low demand for cooling air, high air discharge temperatures and highlyreduced dust emissions. All Paul Wurth sinter coolers are perfectly suited for any type of heat recovery, which can be designed tailor-made to fit each customer’s needs. Ease of maintenance and longer intervals between major maintenance interventions are further design criteria.