Abstract
In this paper, a comparison of two different methods for a steam turbine energy analysis is presented. A high-pressure steam turbine from a supercritical thermal power plant (HPT) was analysed at three different turbine loads using the energy flow stream (EFS) method and isentropic (IS) method. The EFS method is based on steam turbine input and output energy flow streams and on the real steam turbine produced power. The method is highly dependable on the steam mass flow rate lost through the turbine gland seals. The IS method is based on a comparison of turbine steam expansion processes. Observed energy analysis methods cannot be directly compared because they are based on different sources of steam turbine energy losses, so, an overall steam turbine energy analysis is presented. Unlike most steam turbines from the literature, the analysed HPT did not have the highest overall energy efficiency at a full load due to exceeding the water/steam critical pressure at the turbine inlet during such operation.
Highlights
The scientific and professional literature offers many different energy and numerical analysis of entire steam power plants as presented by Erdem et al [1], Mitrović et al [2], Kumar et al [3], Noroozian et al [4], Ahmadi and Toghraie [5] and Uysal et al [6]
A change in the steam mass flow rate, which expands through the high pressure steam turbine (HPT), has a negligible influence on the turbine energy efficiency while using the isentropic energy analysis method, at any observed turbine load
It can be concluded that the change in the steam mass flow rate, which expands through the HPT, at any load is not the dominant element, which defines the turbine energy losses and energy efficiencies in the isentropic energy analysis method
Summary
The scientific and professional literature offers many different energy and numerical analysis of entire steam power plants as presented by Erdem et al [1], Mitrović et al [2], Kumar et al [3], Noroozian et al [4], Ahmadi and Toghraie [5] and Uysal et al [6]. In order to calculate the steam turbine energy power loss and energy efficiency by using the energy flow stream method, the authors presented data of steam mass flow rates lost through each turbine gland seal As the authors of this paper, so far, did not found a comparison of the energy flow stream and isentropic method for the energy analysis of any steam turbine in any literature, in this paper, there is an energy analysis of a high pressure steam turbine (HPT) from a supercritical thermal power plant [52] with both energy analysis methods presented. The main conclusion obtained from the performed analysis is that the results of the energy flow stream method and isentropic method cannot be directly compared because each method presents a different cause of steam turbine energy losses (and different energy efficiencies). An overall energy analysis of any steam turbine ( of the researched HPT) completely defines the steam turbine energy power losses and energy efficiencies
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