Valmet Corp. will supply a heat recovery steam generator to LKAB''s Svappavaara mining area in northern Sweden. The heat recovery steam generator will be used to cool the process gases from Svappavaara's iron ore pelletizing plant so the flue gas cleaning equipment downstream will operate correctly. The recovered heat will be used for space heating via a local district heating network.
The value of the order is approximately $13.7 million. Valmet will engineer, construct and deliver a complete heat recovery system, including equipment such as water treatment, feedwater system, heat exchangers, pumps and instruments, as well as installation and commissioning. The equipment will be delivered in September 2014, and the mechanical installation will be ready in March 2015.
The heat recovery steam generator will cool the pelletizing plant's gases, which exit the process at ~600 to 750ºF (320 to 400ºC), down to 284ºF (140ºC), the temperature needed at the flue gas cleaning plant downstream. The boiler will generate 28 MW of steam at two pressure levels, approximately at 2.5 and 15 bar. The steam is condensed in a hot water condenser, and the heat is utilized in district heating. Alternatively the heat can be used in the industrial water network. All critical systems are redundant to ensure high availability.