Simulation and Investigation on Exergy Destruction Distribution in Single-Phase Heated Surfaces of Boiler under Transient Conditions

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Abstract:

The aim is to describe the irreversibility of energy system under transient conditions more scientifically and to lay foundation for further energy saving under transient conditions. On the basis of the existing research, a model for exergy destruction in single-phase heated surfaces of boiler under transient conditions was established. Taking a 1913t/h-boiler as an example, exergy destructions in single-phase heated surfaces of the boiler and their distributions among processes were calculated respectively. The results were compared with those calculated by models under steady conditions. The analysis shows that exergy destruction in each heated surface under transient condition is still mainly related to the difference of temperature and transferred heat. Some error occurs when models for steady conditions are used for simulation of transient conditions. The main reason is that the heat stored in metal as well as the time rate of exergy is ignored.

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Periodical:

Advanced Materials Research (Volumes 516-517)

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438-443

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May 2012

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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