Thermodynamic assessment of conversion modes of acid gases/methane mixture for syngas production

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Resumo

A thermodynamic assessment of the modes of non-catalytic conversion of acid gases and methane to produce syngas was carried out. The air and steam-air conversion modes of a mixture of hydrogen sulfide, carbon dioxide and methane were studied. Model compositions of gases with different contents of hydrogen sulfide (10, 20 and 30 vol.%) and methane (depending on the stoichiometric fuel excess coefficient) were considered. It has been shown that high temperature leads up the conversion of reagents and the syngas formation. With an increase in the amount of methane, the yield of hydrogen increased over the entire temperature range under consideration (1273–1873 K), but conversion rate of hydrogen sulfide decreased significantly. Increasing the amount of hydrogen sulfide in the initial mixture reduces the yield of synthesis gas. Adding water vapor in amounts up to 5 vol.% leads to an increase in the syngas yield and the [H2]/[CO] ratio. The maximum ratio H2/CO = 2.1 was achieved during air conversion of a mixture with 10 vol.% hydrogen sulfide with the same amount of CO2 with a stoichiometric fuel excess ratio of 10 and T = 1873 K.

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Sobre autores

M. Tsvetkov

Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences

Autor responsável pela correspondência
Email: tsvetkov@icp.ac.ru
Rússia, Chernogolovka

A. Zaichenko

Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences

Email: tsvetkov@icp.ac.ru
Rússia, Chernogolovka

D. Podlesniy

Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences

Email: tsvetkov@icp.ac.ru
Rússia, Chernogolovka

Yu. Tsvetkova

Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences

Email: tsvetkov@icp.ac.ru
Rússia, Chernogolovka

M. Salganskaya

Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences

Email: tsvetkov@icp.ac.ru
Rússia, Chernogolovka

V. Kislov

Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences

Email: tsvetkov@icp.ac.ru
Rússia, Chernogolovka

E. Salgansky

Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences

Email: tsvetkov@icp.ac.ru
Rússia, Chernogolovka

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2. Fig. 1. Dependences of the gas content (C) on the stoichiometric coefficient of excess fuel (φ) for air conversion of the composition xCH4+10 vol.% CO2+ +20 vol.% H2S, reduced to the mass of the obtained products at T=1273 K (a), 1573 K (b), and 1873 K (c).

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3. Fig. 2. Dependences of the degree of hydrogen sulfide conversion ХH2S on the stoichiometric coefficient of excess fuel  for the steam-air conversion of the composition xCH4 +10 vol.% CO2 + 10 vol.% H2S + 5 vol.% H2O at the following temperatures: 1 – 1273 K, 2 – 1573 K, 3 – 1873 K

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