Abstract
In this paper, energy and exergy analysis has been conducted on a subcritical coal fired power plant of Wisconsin Power and Light Company, USA to investigate the steam cycle energy and exergy efficiency. The cycle is analyzed by developing a mathematical model using its operating and design parameters. The analysis is performed using EES (Engineering Equation Solver). The energy analysis shows that major share of energy loss occurs in condenser i.e. 72% of total cycle energy loss, whereas, exergy analysis shows that 83.09% total exergy destruction of cycle occurs in boiler.Furthermore, the simulation results are compared with actual with an absolute error of 3.1%. Additionally, the parametric study is performed to examine the effects of various operating parameters such as main steam pressure and temperature, condenser pressure, terminal and drain cooler temperature difference on net power output, energy andexergy efficiency of cycle. The parametric study shows that the plant has maximum energy and exergy efficiencies at steam pressure of 2500psi, condenser pressure of 1.0psi and main steam temperature of 1100oF. Furthermore, these parameters do not seem to change energy and exergy efficiencies significantly.
Highlights
The energy demand is escalating throughout the globe due to rapid development in technology and evaluation in human lifestyle [1,2]
The net power output and energy efficiency of the selected power plant is obtained from relevant article [29,30] are considered as an actual results, whereas simulation results are obtained by performing simulation of developed mathematical model onEES using preliminary data regarding design and operating parameters given in Table 1 and 3
The results show that the difference in the actual and model values for the total power output and thermal efficiency was only 3.07 and 1.3% respectively
Summary
The energy demand is escalating throughout the globe due to rapid development in technology and evaluation in human lifestyle [1,2]. In the past decade Regulagadda et al [17], Memon et al [18], Rajpar et al [19] and Erdem et al [20] all have performed the energetic and exergetic analysis of different regenerative Rankine cycle power plants According to their energetic results it was found that the maximum energy loss occurred in condenser followed by the boiler and turbine. Exergy analysis for the CCPP’s (Combined Cycle Power Plants) They all have the same kind of results and concluded that the maximum share of exergy destruction was in the combustion chamber followed by the HRSG (Heat Recovery Steam Generator) and in the gas turbine contributing about 85% of the total exergy loss. The energetic and exergetic analysis of Wisconsin Power and Light Company Columbia Energy Centre’s 512MW subcritical coal-fired unit is carried out.The effect of various operating parameters i.e. inlet pressure, main steam temperature and condenser pressure on the cycle performance is determined
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