Experimental Evaluation of the Composition of the Steam Generated during Hydrogen Combustion in Oxygen
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AND MASS TRANSFER AND PHYSICAL GASDYNAMICS
Experimental Evaluation of the Composition of the Steam Generated during Hydrogen Combustion in Oxygen R. Z. Aminova, *, A. I. Schastlivtsevb, **, and A. N. Bayramova a bJoint
Saratov Scientific Center, Russian Academy of Sciences, Saratov, 410028 Russia Institute for High Temperatures, Russian Academy of Sciences, Moscow, 125412 Russia *e-mail: [email protected] **e-mail: [email protected] Received July 18, 2019; revised December 24, 2019; accepted March 10, 2020
Abstract—The existing experiments on hydrogen combustion with a mixture of the resulting steam and a cooling component (steam or water) are analyzed. The results of an experimental test on a hydrogen–oxygen combustion chamber without mixing of the resulting water vapor and a cooling component are presented. The methodology and results of the determination of the degree of hydrogen underburning in the composition of the resulting steam are presented. Tests were carried out for stoichiometric combustion conditions and with an excess of oxidizing agent. It is shown that the hydrogen underburn is 0.32 vol % during stoichiometric combustion and at an oxygen excess of 1.4 the hydrogen underburn is 0.27 vol %. DOI: 10.1134/S0018151X20030013
INTRODUCTION The use of hydrogen as an energy carrier in the energy sector is primarily associated with the possibility of significant overheating of the operating fluid of power plants with high-temperature steam, which results from hydrogen oxidation by oxygen. This leads to an increase in their power and efficiency. In this regard, there have been some developments of various burner devices for hydrogen oxidation by oxygen. Theoretical studies of the completeness of hydrogen oxidation in oxygen must be confirmed by experimental studies due to the complexity of the process. Analysis of the studies in this area [1–12] makes it possible to single out a number of the most important factors affecting the completeness of hydrogen oxidation: — the cooling rate of high-temperature steam and mixing rate of high-temperature steam with a cooling body (the so-called quenching effect); — the type of mixing element and associated mixing intensity; — the pressure in the combustion chamber. It should be noted that no research papers were found on the experimental study of hydrogen combustion in oxygen at a stoichiometric ratio of the components without the addition of cooling water. The dilution of the obtained high-temperature steam with cooling water or steam is considered. The cooling rate of high-temperature steam depends on the cooling agent (water or water vapor) and the manner in which it is mixed with combustion products.
The first results of such studies with the dilution of high-temperature steam with water were obtained in Germany [1–4]. The combustion chamber of a hydrogen–oxygen steam generator has several special inserts in the form of rings with nozzles for water injection. In Russia, there have been a number of studies [10–16] on hydrogen combustion with oxygen. Various devices of h
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