Study of the influence of the completeness of combustion of the hydrogen-oxygen mixture on the technical and economic efficiency of the hydrogen energy complex at nuclear power plants

   An assessment was made of the influence of underburning of hydrogen in a hydrogen-oxygen steam generator on the technical and economic efficiency of installing a hydrogen energy complex at a nuclear power plant, which is a well-known approach to solving an urgent problem of modern energy systems - ensuring the further development of nuclear energy as an environmentally friendly source of electricity based on the accumulation of off-peak electricity. An approach is considered and a diagram is presented for increasing the reliability of using the hydrogen energy complex at nuclear power plants by reducing underburning and eliminating the entry of unburned hydrogen into the main steam power cycle of the power unit. Several options for the level of hydrogen underburning and a range of system operating conditions for the hydrogen energy complex are considered. A comprehensive calculation of the technical and economic indicators of the hydrogen energy complex at nuclear power plants was carried out, and the conditions for its effectiveness were determined. As calculations have shown, underburning of hydrogen leads to a noticeable decrease in annual income and average annual profit from the sale of peak electricity. The achieved reduction is 11,67 and 35,01 million rubles/year at 5 and 15 % underburning of hydrogen, respectively. At the minimum tariff for off-peak electricity, the reduction in accumulated net present value is 96,6, 192,8 and 289,4 with an increase in hydrogen underburning to 5, 10 and 15 %, respectively. The dependence of the maximum level of hydrogen underburning on the tariff for off-peak electricity, which ensures the efficiency of implementation of the considered hydrogen energy complex at nuclear power plants, is constructed. As calculations have shown, efficient operation of the hydrogen energy complex is achieved with a tariff for off-peak energy efficiency in the range from 0 to 0,45; 0,38; 0,3 and 0,24 rubles/kWh for hydrogen underburning of 0,5, 10 and 15 %, respectively.

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