Abstract
In pilot-scale tests of a waste heat recovery system designed for Kroll process, energy and exergy efficiency were only 30% and 10%, and there is no judgement about this system. In present work, the exergy destruction analysis is used to investigate heat transfer and effectiveness of the system. The water with the flow rate of 0.12 kg/s, 0.14 kg/s and 0.16 kg/s is forced across a shell-tube heat exchanger, while the air flow rate is 22 m3/min with a temperature range of 350∼380°C. The results show that higher air inlet temperature is good for all indicators, while greater water mass flow rate is only good for heat transfer rate, irreversible heat transfer rate and water side irreversibility ratio. The energy and exergy effectiveness have a similar trend. From the viewpoint of energy quality and quantity, the tested shell-and-tube heat exchanger system can still be used to recover waste heat in Kroll process.
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