This article sets out the recent technologies for off-gas cooling with waste heat recovery systemsrnor waste heat boilers downstream pyrometallurgical processes for lead and zinc on the basis of conductedrnindustrial applications. One objective is a modified furnace designed as an integrated part of the waste heatrnboiler system. Different heating surface designs that are adapted to the process conditions are described.rnThe cleaning system to control the fouling on the heating surfaces and to adjust the cooling efficiency isrnintroduced. Another objective is the thermal expansion of waste heat boilers. Furthermore, possiblerndevelopments and improvements for waste heat boiler systems are shown.
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