Time filter

Source Type

Kuznetsov V.A.,Institute for Electrophysics and Electrical Power RAS
30th Annual International Pittsburgh Coal Conference 2013, PCC 2013 | Year: 2013

The description is presented for 1D kinetic model designed to estimate the reduction zone volume of a downdraft gasifier. The equilibrium approach in gas-phase is used to determine the maximum value of temperature in a gasifier and initial conditions for modeling. Two main heterogeneous reactions of H2O and CO2 with fixed carbon are considered. The diffusion mass transfer limits rate of these reactions and penetration of gaseous reactants trough pores. The model validation for low temperatures is performed using experimental data along with homogeneous and random pore models. The calculation results are also presented for gas composition, temperature, fixed carbon conversion in the reactor reduction zone for steam-plasma gasification of coal. Several calculations were conducted varying the following parameters: oxidant flow rate, energy content of plasma and size of coal particles. The gas-phase composition at the end of the reduction zone and equilibrium composition of gasification products were compared.


Borovskoy A.M.,Institute for Electrophysics and Electrical Power RAS | Popov S.D.,Institute for Electrophysics and Electrical Power RAS | Surov A.V.,Institute for Electrophysics and Electrical Power RAS
Journal of Physics: Conference Series | Year: 2013

The article is devoted to the calculation of gas dynamic parameters of gas flow in various areas of low-temperature plasma generator, therefore, target area's grid was built for the simulation of plasma gas flow in channels of studied high-voltage AC plasma torches and calculations of three-dimensional gas flow was made using GAMBIT and FLUENT soft-ware and Spalart-Allmares turbulence model, air flow was simulated in the tangential feed's areas, in the cylindrical channel, in the tapering nozzle chamber and in the mixing chamber of plasma torches and outside (in the environment); thus, 3D-modelling of the cold plasma-forming gas flow was performed in cylindrical channels of studied high-voltage AC plasma torches with rod electrodes for the first time. © Published under licence by IOP Publishing Ltd.


Rutberg P.G.,Institute for Electrophysics and Electrical Power RAS | Kuznetsov V.A.,Institute for Electrophysics and Electrical Power RAS | Serba E.O.,Institute for Electrophysics and Electrical Power RAS | Popov S.D.,Institute for Electrophysics and Electrical Power RAS | And 3 more authors.
Applied Energy | Year: 2013

Research results are presented for an AC electric arc that burns a mixture of steam and air in a three-phase high-voltage plasma torch and can be implemented to produce plasma for plastic waste gasification. The dependences of electric parameters on the ratio of the steam to air mass flows (H2O/air ~1-6) at an approximately constant total mass flow of the plasma-forming gas are obtained during several experiments. During the experiments, the arc parameters were as follows: voltage drop of 1.0-1.8kV, current of ~28.5A and power of ~52-86kW. The thermal efficiency of the plasma torch was ~94-95%. CCD cameras operating at 4000fps were used to determine the average discharge length of ~798mm. Photography with a high shutter speed (1/8000s) was used to determine the average arc diameter (~4.47mm). Arc temperatures were calculated (10,000-11,500K) using the thermodynamic equilibrium approach. Experimental results indicate that increases in the steam content of the steam-air plasma lead to a reduction of the arc's temperature and electrical conductivity. Using an equilibrium approach, the main parameters of plasma gasification were estimated: syngas yield (3.62-3.48m3/kg), composition (H2 - 55.5-62.5, CO - 32.8-34.1vol.%) and energy consumption (11.0-12.3MJ/kg). © 2013 Elsevier Ltd.


Shershunova E.,Institute for Electrophysics and Electrical Power RAS | Malashin M.,Institute for Electrophysics and Electrical Power RAS | Moshkunov S.,Institute for Electrophysics and Electrical Power RAS | Khomich V.,Institute for Electrophysics and Electrical Power RAS
Acta Polytechnica | Year: 2015

This paper presents the realization and a diagnosis of the volume diffuse dielectric barrier discharge in a 1-mm air gap when high voltage rectangular pulses are applied to the electrodes. A detailed study has been made of the effect of the applied pulse width on the discharge dissipated energy. It has been found experimentally that the energy remained constant when the pulse was elongated from 600 ns to 1 ms. © Czech Technical University in Prague, 2015.


Rebrov I.E.,Institute for Electrophysics and Electrical Power RAS | Khomich V.Y.,Institute for Electrophysics and Electrical Power RAS | Yamshchikov V.A.,Institute for Electrophysics and Electrical Power RAS
Journal of Physics: Conference Series | Year: 2015

This paper presents a numerical analysis of the intense EHD gas flow velocity distribution at atmospheric pressure. The system consists of a coaxial plasma emitter and a collector grid. The ion source is a dielectric barrier discharge distributed over the surface of the emitter. The computational results coincide with the experimental data which allow us to predict the maximum flow rate produced by the experimental setup. © Published under licence by IOP Publishing Ltd.


Yamshchikov V.A.,Institute for Electrophysics and Electrical Power RAS
Journal of Physics: Conference Series | Year: 2015

New approach for suppression of plasma inhomogeneities and instabilities in the volume self-sustained discharge is offered. The physical model is offered and conditions of obtaining extremely homogeneous self-sustained discharge are defined (with full suppression of plasma inhomogeneity and instability). Results of calculations agree with experiments. © Published under licence by IOP Publishing Ltd.


Bratsev A.N.,Institute for Electrophysics and Electrical Power RAS | Kumkova I.I.,Institute for Electrophysics and Electrical Power RAS | Kuznetsov V.A.,Institute for Electrophysics and Electrical Power RAS | Popov V.E.,Institute for Electrophysics and Electrical Power RAS | And 2 more authors.
IOP Conference Series: Materials Science and Engineering | Year: 2011

Waste disposal dumps are one of sources of carbonic gas penetration in the atmosphere. The waste is treated into RDF (refuse-derived fuel) and used in boilers for electric power or heat generation for decrease in carbonic gas emissions in the atmosphere. In industry power stations on the basis of the combined cycle have the highest efficiency of burning. The paper deals with the application of an air-plasma gasifier using the down draft scheme of RDF transformation into synthesis gas, which afterwards can be used in the combined cycle. Results of calculations of the process characteristics for various RDF compositions are presented. The advantage of the plasma method in comparison with autothermal one is shown. Experimental data are shown.


Rutberg Ph.G.,Institute for Electrophysics and Electrical Power RAS | Kuznetsov V.A.,Institute for Electrophysics and Electrical Power RAS | Bratsev A.N.,Institute for Electrophysics and Electrical Power RAS | Popov V.E.,Institute for Electrophysics and Electrical Power RAS | And 2 more authors.
IOP Conference Series: Materials Science and Engineering | Year: 2011

The modern electric power sector is based on burning of carbonaceous substances (coal, oil, natural gas, etc.). Large power stations are powerful local sources of carbon dioxide. Inconstancy of the electric power demand leads to increase in CO2 specific emissions, as the output power is basically higher than required one by the power network. One of promising ways of increase of operating efficiency of power stations is use of surpluses of the generated electric power in plasma technologies. The paper deals with the opportunity to use the plasma technologies in processes of methanol and methane production from carbon dioxide. Comparison of ranges of key parameters of plasma gasification of wood by air, carbon dioxide, and steam is presented. Also, use of CO2 for pure carbon production is examined.


Rutberg P.G.,Institute for Electrophysics and Electrical Power RAS | Kuznetsov V.A.,Institute for Electrophysics and Electrical Power RAS | Popov V.E.,Institute for Electrophysics and Electrical Power RAS | Popov S.D.,Institute for Electrophysics and Electrical Power RAS | And 3 more authors.
Applied Energy | Year: 2015

A promising method of methane conversion by thermal plasma is presented. It allows syngas production with a set H2/CO ratio of ~2.1 and with a ~95.2% H2+CO content. In comparison with other plasma methods, it differs in its high methane conversion level (91-98.3%), low energy consumption (31.8-35.9MJ/kg) of converted methane and high selectivity on H2 and CO. The influence of energy consumption and oxidizer excess on the key parameters of the process is studied. It is found that with a weak influence of heat losses and a volumetric flow of thermal energy (~1MW/m3), the optimum energy consumption is approximately 25.5-27.1MJ/kg of injected methane and the optimum excess of oxidizer is 0-10%. The principal cause of the differences in experimental and calculated values is the wall influence (heat losses). The economic efficiency by combining the method and Fischer-Tropsch synthesis is estimated for the USA, and the profits of end-product sales have exceeded the expenses by ~67%. © 2015 Elsevier Ltd.

Loading Institute for Electrophysics and Electrical Power RAS collaborators
Loading Institute for Electrophysics and Electrical Power RAS collaborators