The Efficiency of Hydrogen Combustion with Excess Oxidizer in a Closed Hydrogen Cycle at NPP

The article discusses the issues of technical and economic efficiency of combustion hydrogen with excess oxidizer when combining NPPs with a hydrogen energy complex based on a closed hydrogen cycle. Combustion hydrogen fuel with an excess of oxidizer allows minimizing the underburning of hydrogen fuel and increasing the efficiency of the hydrogen cycle. Using this approach, a safe and effective increase in the efficiency and power of NPPs is ensured by increasing the temperature of the steam in the cycle of the steam turbine unit by combustion hydrogen fuel in oxygen. Increasing the efficiency of hydrogen cycles at NPPs ensures the further development of environmentally friendly energy based on nuclear-hydrogen technologies and the possibility of efficient loading of NPPs in condition of an uneven schedule of power consumption in the country's energy systems. The authors of the article have conducted a study of the technical and economic efficiency of combustion hydrogen with an excess of oxidizer based on a closed hydrogen cycle.

The effectiveness of the scheme for combining NPPs with a hydrogen cycle using a closed system for combustion hydrogen with an excess of oxidizer has been evaluated. This approach allows the safe use of the heat of hydrogen fuel to increase the parameters of fresh steam of steam turbine unit. It is shown that the implementation of the scheme with an excess of oxidizer makes it possible to exclude the preliminary cooling system of the comb ustion products, which makes it possible to more efficiently use the heat of hydrogen fuel due to a more significant increase in the temperature of fresh steam and the corresponding increase in the power of steam turbine unit.

We have obtained the main indicators of comparative technical and economic efficiency of the proposed scheme for combining NPPs with a hydrogen energy complex based on a closed cycle of hydrogen combustion with an excess of oxidizer. It is shown that the cost of production of additional electricity is competitive in comparison with the scheme of pre-cooling of combustion products. At the same time, the calculation of the accumulated net present value shows the effectiveness of the proposed scheme for hydrogen overheating of steam at NP Ps, taking into account the possible savings of natural gas in the power system. The results can be used in the development of systems for increasing the maneuverability of NPPs.

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