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402 results on '"Savchenko, V. I."'

19. Quantum, Multi-Body Effects and Nuclear Reaction Rates in Plasmas

Author

Savchenko, V. I.

Subjects
Condensed Matter - Statistical Mechanics
Abstract

Detailed calculations of the contribution from off-shell effects to the quasiclassical tunneling of fusing particles are provided. It is shown that these effects change the Gamow rates of certain nuclear reactions in dense plasma by several orders of magnitude., Comment: 11 pages; change of content: added clarification of one of the important steps in the derivation

Published
2000
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20. Nuclear Reaction Rates in Dense Plasmas

Author

Savchenko, V. I.

Subjects
Astrophysics
Abstract

We solve the quasiclassical problem of tunneling through an external potential barrier in a dense plasma, where the tunneling particles undergo simultaneous collisions with other particles in thermodynamic equilibrium. Under such conditions the spectral density of states available to the particle has a Lorentz shape, rather than the delta function, which leads to a quantum tail in the particle momentum distribution function. We show that, this tail indeed significantly alters the average nuclear reaction rates, which supports earlier suggestions. This rate can be many orders of magnitude higher than would be normally calculated by averaging over the Maxwell distribution of energies.

Published
1999

21. Combined Production of Hydrogen and Methanol without CO2 Emission Based on Matrix Conversion of Natural Gas.

Author

Arutyunov, V. S., Nikitin, A. V., Savchenko, V. I., and Sedov, I. V.

Subjects
NATURAL gas, HYDROGEN production, METHANOL production, METHANOL as fuel, CARBON emissions, CARBON dioxide
Abstract

Reducing carbon dioxide emissions during production is one of the main trends in modern oil and gas chemistry. One of the most realistic possibilities for achieving this is to involve carbon dioxide generated in technological processes as a feedstock for producing gas chemical products. The maximum effect can be achieved in the production of large-scale chemicals, such as syngas, hydrogen, and methanol. We consider such possibilities and present a new combined autothermal process for the joint production of hydrogen and methanol based on non-catalytic matrix conversion of natural gas into syngas, which allows one to almost avoid CO2 emissions. [ABSTRACT FROM AUTHOR]

Published
2023
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22. Non-Catalytic Partial Oxidation of C2+ Hydrocarbon/H2 Mixtures.

Author

Savchenko, V. I., Ozerskii, A. V., Nikitin, A. V., Sedov, I. V., and Arutyunov, V. S.

Subjects
PARTIAL oxidation, MIXTURES, STEAM reforming, MATHEMATICAL optimization, TEMPERATURE distribution, SYNTHESIS gas
Abstract

The paper reports the results of a kinetic and thermodynamic analysis of non-catalytic partial oxidation of methane and C2–C4 hydrocarbon/hydrogen mixtures (C/H = 1 : 4) at 1400–1700 K. The hydrocarbon conversion sequence and the time periods of the major process stages were identified for isothermal conditions. The initial stage of the oxidative conversion of C2+ hydrocarbons consists of their pyrolysis, primarily into ethylene and propylene, followed by oxidation of the pyrolysis products. In this respect, the kinetics of C2+ hydrocarbon oxidative conversion are different from those of methane conversion, marked by the almost simultaneous and significantly slower occurrence of pyrolysis and oxidation. The subsequent stages involve steam and dry reforming of the oxidation products, namely acetylene and methane; these stages continue until the main products (H2, CO, CO2, and H2O) reach an equilibrium distribution for the given temperature. The study findings are important for the optimization of various techniques for high-temperature syngas production via partial oxidation of C2+ hydrocarbons, as well as Moderate or Intense Low-Oxygen Dilution (MILD) combustion processes. [ABSTRACT FROM AUTHOR]

Published
2023
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45. Noncatalytic Syngas Production Processes and Possibilities of Reducing the СО2 Emission into the Environment.

Author

Savchenko, V. I., Zimin, Ya. S., Nikitin, A. V., Sedov, I. V., and Arutyunov, V. S.

Subjects
*MANUFACTURING processes, *SYNTHESIS gas, *PARTIAL oxidation, *CARBON dioxide, *COMPUTER performance, *POSSIBILITY, *CHEMICAL processes
Abstract

The development of noncatalytic procedures for processing hydrocarbon gases is an important way to increase the efficiency of gas-chemical processes and decrease their power consumption. The paper deals with thermodynamic and kinetic modeling of noncatalytic processes of the partial oxidation and steam and carbon dioxide conversion of methane in the temperature interval 1400–1800 K and with analysis of the process for syngas production by matrix conversion of rich methane–oxygen mixtures. Comparison of the kinetic calculations with the experimental data demonstrated the possibility of applying published models to the description of the matrix conversion of methane. The possibility of developing a highly efficient technology based on noncatalytic partial oxidation of hydrocarbons for the syngas production without СО2 emission into the environment is discussed. [ABSTRACT FROM AUTHOR]

Published
2022
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