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Kotzebue Electric Association Waste Heat Recovery & Power Renewable Energy Fund Grant Stack heat recovery has not been met with much success in Alaska. To date there is only one system, Red Dog Mine, with uses stack heat successfully. Up until now there have been mechanical problems with the heat exchangers themselves which have caused damage to the power plant, such as corrosion. However, technological advances have addressed these problems effectively making stack heat recovery a viable option. Kotzebue Electric Association has been working with Cain Industries to install the appropriate units in the KEA power plant. Exhaust stack temperatures out the stack reach approximately 500-600F. This is lower than is typically expected due to the presence of EMD’s aftermarket after cooler which is required by the EPA for emission reduction. A minimum of 300F is needed to avoid the formation of sulfuric acid in the stacks. One independent horizontal heat recovery unit will be placed in each of the three EMD 710 stacks. This will give KEA a total of three units. The recovered heat will be transferred to the 50/50 glycol/water loop via heat exchanger. Cain’s HRSR units feature a full port exhaust gas bypass with blanket wrap insulation and stainless steel finned tubes which have an access door for each of inspection and cleaning. There is a Liquid Temperature Control Assembly which automates the temperature of the 50/50 glycol/water loop by modulating the exhaust bypass. The HRSR will take a liquid flow rate of 250 gpm which will be split off from the existing jacket water flow of at least 1100 gpm. Running the EMDs year round at 85% load will provide KEA with 12,649 MMBtus. This is equivalent to $543,907 savings per year (at $43/MMBtu2). November 10th 2008 4.3. Proposed System 4.3.1.System Design 2 Based on October 2008 prices of $6.00/gallon Page 28 of 48PDF Image | Alaska Energy Grant Renewable Energy
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