Exergy and exergoeconomic analysis of a steam boiler
Relying on coal as primary fuel in thermal power plants represents an unsustainable concept due to limited coal reserves and a negative environmental impact. Efficient utilization of coal reserves and a request for minimization of irreversibilities are imperative for thermal power plants...
Main Authors: | , , , , |
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Format: | Article |
Language: | English |
Published: |
VINCA Institute of Nuclear Sciences
2018-01-01
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Series: | Thermal Science |
Subjects: | |
Online Access: | http://www.doiserbia.nb.rs/img/doi/0354-9836/2018/0354-983618601M .pdf |
Summary: | Relying on coal as primary fuel in thermal power plants represents an
unsustainable concept due to limited coal reserves and a negative
environmental impact. Efficient utilization of coal reserves and a request
for minimization of irreversibilities are imperative for thermal power
plants operation. Numerous studies have shown that a steam boiler is a
thermal power plant component with the highest irreversibility. The idea of
this paper is to quantify the amounts and sources of irreversibilities
within a steam boiler and its components, serving a 348.5MWe thermal power
plant. Having this in mind, exergy and exergoeconomic analysis of a steam
boiler is presented in this paper. Exergy destruction and exergy efficiency
of all boiler components and of the boiler as a whole were calculated.
Based on exergy flows and economic parameters (cost of the boiler, annual
operation hours of the unit, maintenance factor, interest rate, operating
period of the boiler), exergy analysis resulted in the cost of produced
steam. The obtained results show that the boiler exergy efficiency is at
47.4%, with the largest exergy destruction occurring in the combustion
chamber with a value of 288.07 MW (60.04%), and the smallest in the air
heater with a value of 4.57 MW (0.95%). The cost of produced steam is
calculated at 49,356.7 $/h by applying exergoeconomic analysis. |
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ISSN: | 0354-9836 2334-7163 |