| Summary: | In order to increase the efficiency of a preheating system as temperatures increase, without using seawater as a coolant, an additional heat exchanger is required to be installed into the system. The purpose of the study is therefore to investigate how the temperatures of fuel oils can be increased while minimising the loss of energy and costs. The study was conducted in Karlshamn Power Station's (kvt) preheating system on Block 3. The study was conducted via Design for six sigma (DFSS) according to the primary design concept SG2 to guarantee the study's understanding of empirical data, and the development of solutions. The study resulted in two variants of heat exchangers where one is an identical Shell and Tube heat exchanger from Siljan Allards AB and the other one is a Supermax Shell and Plate heat exchanger from Tranter International.
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