Microwave destruction of high moor peat: modeling and experimental studies in a quartz reactor

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Resumo

The article presents the results of theoretical and experimental studies comparing the thermal degradation of high moor sphagnum peat in the process of pyrolysis (thermolysis) initiated by convenient thermal and microwave exposure. Based on modeling using the commercial software package CST Studio Suite, reactor designs have been developed that allow for a correct comparison of these processes under identical conditions. Comparative experiments conducted on the basis of reactors with various thermal sources have demonstrated the advantages of microwave pyrolysis, which allows for “instantaneous” and volumetric heating of the product and its deeper processing with high energy efficiency. The results of peat processing under different thermal effects and the yield of pyrolysis reaction products are discussed.

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Sobre autores

S. Ananicheva

Federal Research Center Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS); National Research Lobachevsky State University of Nizhny Novgorod

Autor responsável pela correspondência
Email: bulanova@ipfran.ru
Rússia, 603950 Nizhny Novgorod; 603022 Nizhny Novgorod

T. Krapivnitckaia

Federal Research Center Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS)

Email: kto@ipfran.ru
Rússia, 603950 Nizhny Novgorod

A. Alyeva

Federal Research Center Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS)

Email: a.alyeva@ipfran.ru
Rússia, 603950 Nizhny Novgorod

A. Vikharev

Federal Research Center Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS)

Email: alvikharev@ipfran.ru
Rússia, 603950 Nizhny Novgorod

M. Glyavin

Federal Research Center Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS)

Email: glyavin@ipfran.ru
Rússia, 603950 Nizhny Novgorod

A. Denisenko

Federal Research Center Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS)

Email: androu@ipfran.ru
Rússia, 603950 Nizhny Novgorod

N. Peskov

Federal Research Center Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS); National Research Lobachevsky State University of Nizhny Novgorod

Email: peskov@ipfran.ru
Rússia, 603950 Nizhny Novgorod; 603022 Nizhny Novgorod

S. Zelentsov

Federal Research Center Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS); National Research Lobachevsky State University of Nizhny Novgorod

Email: zelentsov@chem.unn.ru
Rússia, 603950 Nizhny Novgorod; 603022 Nizhny Novgorod

A. Sachkova

Federal Research Center Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS); National Research Lobachevsky State University of Nizhny Novgorod

Email: a.sachkova@ipfran.ru
Rússia, 603950 Nizhny Novgorod; 603022 Nizhny Novgorod

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2. Fig. 1. Results of three-dimensional modeling of heat propagation processes in a pyrolysis reactor with heat transfer from the wall (a) and microwave exposure (b). Instantaneous temperature distribution in the cross section of the reactor (Wurtz reaction flask) after 15 min of irradiation is shown (the used logarithmic temperature scale is shown on the right).

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3. Fig. 2. Flow chart of thermal and microwave pyrolysis units: 1 — heat source (1.1 — heating element, 1.2 — magnetron); 2 — microwave radiation shielding chamber; 3 — quartz reaction vessel; 4 — peat sample; 5 — liquid settler; 6 — gas meter, 7 — Richter absorber; 8 — gas sampler; 9 — pressure gauge; 10 — pump; 11 — oscilloscope; 12 — high-voltage power source; 13 — computer control system.

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4. Fig. 3. Heat maps taken with a thermal imager in experiments on peat destruction in a reaction vessel with thermal (a) and microwave (b) heating under reduced pressure.

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