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1.4 Heat integration analysis Boliden Harjavalta, Finland Boliden Harjavalta recovers 20 MW (68.2 MMBtu/h) of heat in its sulphuric acid plant. Half of this energy is used in Boliden’s copper and nickel plants in the area, and the other half is sold to the local district heating network. Recovering heat is only valuable if the heat can be reused. The recovered heat must add to the bottom-line result in some way for an investment to be justifiable. Finding the best opportunities To find all the potential ways to create value from recovered heat, the whole energy system of the plant must be analyzed, as well as the processes, the cooling system and surrounding factors. Often the best way to profit on recovered heat is less obvious than just saving fuel. There are many parameters to take into account, some being: • How is process heat generated? • What is the optimum load on the boilers/burners? • How is electricity generated? Is there any spare capacity in the co-generation systems? • Are there constraints in the cooling systems? • Are there bottlenecks related to heating or cooling? • Are there neighbouring plants or residential areas? The flowchart on the next page shows the basic energy-related units found in most plants, and will be the starting point for the discussion in the next chapter on how to make money from waste heat. Photo: Liisa Valonen 10PDF Image | Waste heat recovery Optimizing
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