Abstract
The reconstruction of ageing thermal power plants with the possibility of their increased efficiency, prolonged service and decreased environmental impact is an intensely debated and researched topic nowadays. Among various concepts, the replacement of the steam cycle by a supercritical CO2 cycle is proposed with the prospect of reaching higher efficiencies at the same working fluid inlet parameters as the ultra-supercritical steam cycles. A paper published previously by Rogalev et al. (2021) analyzed the variants of supercritical coal power plant reconstruction to a supercritical CO2 cycle and ranked them according to the cycle efficiency. This contribution comments on the scope and applied method in that paper aiming to provide additional input relevant to the decision-making process on thermal power plant reconstruction to such a cycle.
Highlights
Parametric Optimization of supercritical CO2 cycles (S-CO2)The issue of ageing conventional thermal power plants and the optimal solution of this problem are both intensely researched topics
In order to contribute to the scientific debate and to strengthen the basis for the decision-making process regarding the reconstruction of thermal power plants, a few remarks pertaining to the scope of the presented analysis and the underlying calculations are presented here
It is the best practice to preheat combustion air in a separate heater to 50 to 100 ◦ C. Before sending it to the air heater heated by flue gas [38]. This contribution analyzed the previous paper by Rogalev et al (2021) [21] considering the applied method of evaluating individual layouts of coal power plant reconstruction alternatives
Summary
The issue of ageing conventional thermal power plants and the optimal solution of this problem are both intensely researched topics. These power plants have served for decades as traditional and reliable power sources with sufficient flexibility to balance the power transmission system [1,2]. Their research, relevant to this comment paper, is devoted to the inclusion of S-CO2 cycle to both nuclear [19] and thermal power plants [20] Their present paper [21] published in Energies provides and analyzes alternatives increasing the thermal efficiency of conventional coal-fired power. In order to contribute to the scientific debate and to strengthen the basis for the decision-making process regarding the reconstruction of thermal power plants, a few remarks pertaining to the scope of the presented analysis and the underlying calculations are presented here
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