Dependence of the Pyrocarbon Structure on the Parameters of the Process of Pyrolysis of Hydrocarbon Gases in an Electrothermal Fluidized Bed

Semeiko, K. V.; Kustovskyi, S. S.; Kupriyanchuk, S. V.; Chumak, R. E.

doi:10.1007/s10891-020-02166-9

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…Moreover, because of previous research on coatings on the model of the pebble nuclear fuel (SiO 2 , Dy 2 O 3 , Gd 2 O 3 , Sm 2 O 3 ), batches of pyrocapsulated material with pyrocarbon content were developed in a wide range of 6-97% mass [29]. Due to the complexity of obtaining Dy 2 O 3 , Gd 2 O 3 , and Sm 2 O 3 , these models are highly expensive.…”

Section: Introductionmentioning

confidence: 99%

Pyrocarbon Coating on Granular Al2O3 for HTGR-Type Power Reactor

Sklabinskyi,

Pitel,

Skydanenko

et al. 2023

Coatings

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Fourth-generation nuclear power systems are based on high-temperature gas-cooled reactors, in which the pebble fuel is the primary energy carrier. In this regard, applying protective pyrocarbon coatings on granulated fuel is an essential problem in ensuring the reliability of nuclear power plants. The article’s main idea is to research rational technological parameters of forming a pyrocarbon protective coating on the granules of a nuclear fuel model. For this purpose, granulated Al2O3 with the protective pyrocarbone coating was applied as a fuel model. The article’s aim is to study the effect of thermophysical parameters on applying a protective pyrocarbon coating on granulated Al2O3. During the experimental studies, thermal imaging of the pyrolysis process was used. The scientific novelty of the work is the equilibrium curves for the systems Al2O3:CH4, Al2O3:CH4:N2, and Al2O3:CH4:Ar. Their analysis allowed for evaluating rational thermochemical parameters of the pyrolysis process. As a result, rational thermophysical parameters of coating granulated Al2O3 with a pyrocarbon layer were evaluated, and the practical possibility of applying the pyrocarbon coating to granulated Al2O3 in the electrothermal fluidized bed was experimentally proven. It was shown that nitrogen does not significantly affect the target reaction product under a temperature of less than 1500 K. Also, the rational conditions for the pyrocarbon coating at a pressure of 0.1 MPa were realized at a temperature of 900–1500 K and using argon. Moreover, pyrocarbon was precipitated from hydrocarbon at 1073–1273 K. Overall, the need to add an inert gas for reducing the carbon black formation was proven to prevent a reduction of natural gas efficiency.

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Section: Introductionmentioning

confidence: 99%

Pyrocarbon Coating on Granular Al2O3 for HTGR-Type Power Reactor

Sklabinskyi,

Pitel,

Skydanenko

et al. 2023

Coatings

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Effect of leakage of volatile synthesis products on silicon carbide yield in an electrothermal fluidized bed reactor

Kuzevanov,

Zakozhurnikov,

Zakozhurnikova

2024

Fine Chem. Technol.

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Objectives. To calculate the effect of leakage of volatile synthesis products on silicon carbide yield in an electrothermal fluidized bed reactor, as well as to develop a general model of the synthesis of finely divided silicon carbide. This will be achieved by particularizing a mathematical model of leakage of volatile products of chemical reactions from the reaction volume of the reactor with the fluidizing inert gas.Methods. As a method to produce silicon carbide, synthesis in an electrothermal fluidized bed was studied. The model of leakage of volatile products was validated by comparing the calculation results with existing experimental data on the SiC synthesis in a hightemperature fluidized bed reactor. The comparison parameters were: mass yield of silicon carbide, and the total synthesis time in a reactor with batch loading of silicon dioxide into the reaction volume.Results. The value of the parameter p in the general model of SiC synthesis in a fluidized bed was established. The parameter p is equal to the ratio of the number of carbon-containing particles involved in the formation of SiO, to the total number of silicon dioxide particles. It also characterizes the composition of stable complexes of particles of the charge at various operating temperatures of the fluidized bed. The discrepancy between the calculated and experimental values of the masses of the synthesized silicon carbide was shown not to exceed 15.5% at a high temperature of the fluidized bed (T = 1800°C) and decreases with a decrease in the operating temperature to 4.7% at T = 1450°C.Conclusions. The general computational model for silicon carbide synthesis with a built-in procedure for calculating the leakage of volatile products of chemical reactions enables the variants of SiC production in electrothermal fluidized bed reactors to be analyzed. In this case, it is important to establish an energy-efficient working cycle without preliminary expensive experimental studies.

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Investigation of the Process of Obtaining Pyrocarbon in an Electrothermal Fluidized Bed

Simeyko

Malinouski

Karsim

et al. 2021

Energ. Tech. & Res. Sav.

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Carbon materials with a wide range of performance properties are used in various science, technology, and industry fields. For example, Pyrocarbon has the prospect of being used in nuclear power engineering, special metallurgy, aerospace technologies, heat exchange equipment, medicine, mechanical engineering, reactor building and other industries. The research described in the article aims to study the process of obtaining pyrocarbon in an electrothermal fluidized bed. The research is based on experimental methods of studying the process of obtaining pyrolytic carbon. Pyrocarbon is precipitated during pyrolysis (thermal destruction) of hydrocarbons in an electrothermal fluidized bed reactor. Natural gas was used as a fluidizing agent, and crushed fine electrode graphite of the GE model was used as a fluidized bed. When producing batches of pyrocarbon material, taking into account that the particle size will increase, these particles were crushed and subsequently used as a fluidized bed, thereby replacing graphite with pyrocarbon. As a result of the experimental studies carried out in the reactor with the electrothermal fluidized bed reactor, the batches of pyrocarbon material that were produced based on artificial graphite were produced. Studies using electron microscopy showed a change in the color and structure of the pyrocarbon coating depending on the processing cycle in the electrothermal fluidized bed reactor at temperatures of 900–1200 °C. Diffractometric analysis showed that pyrocarbon was identified in the treated material. Therefore, the adequacy of the method for calculating the heat balance has been confirmed. Bibl. 36, Fig. 7, Table 1.

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Dependence of the Pyrocarbon Structure on the Parameters of the Process of Pyrolysis of Hydrocarbon Gases in an Electrothermal Fluidized Bed

Cited by 3 publications

References 9 publications

Pyrocarbon Coating on Granular Al2O3 for HTGR-Type Power Reactor

Pyrocarbon Coating on Granular Al2O3 for HTGR-Type Power Reactor

Effect of leakage of volatile synthesis products on silicon carbide yield in an electrothermal fluidized bed reactor

Investigation of the Process of Obtaining Pyrocarbon in an Electrothermal Fluidized Bed

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