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Scientists of the Yenisei Siberia Research Center have improved the technology for producing hydrogen fuel

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The technology for the production of hydrogen and hydrogen-containing mixtures from organic waste in a tubular pyrolysis reactor has been improved by SibFU scientists as part of an international research team. The research was carried out in the laboratory of biofuel compositions of the Siberian Federal University on the state assignment of the Ministry of Science and Higher Education of Russia. The laboratory was created as part of the activities of the scientific and educational center "Yenisei Siberia".


25.09.2023

Due to global warming and the depletion of non-renewable natural resources, the task of developing technologies for the capture, processing and disposal of industrial waste is becoming increasingly important for the sustainable development of energy and environmental safety, the authors of the work say.


One of the ways to recycle waste is the decomposition of organic and many inorganic compounds into molecules of simpler substances under the influence of high temperature — pyrolysis. Pyrolysis, for example, can produce hydrogen from hydrocarbons.


Scientists of the Siberian Federal University, together with Russian and German colleagues, have modeled and experimentally proved that the efficiency of production of hydrogen and hydrogen—containing mixtures in a pyrolysis reactor can be increased by increasing the area of contact of the coolant with raw materials - organic industrial waste. The area was increased by applying hemispherical projections to the inner surface of the channel through which the coolant passes.


"A similar effect in everyday life can be observed when tea is cooled. When we pour tea from a cup into a saucer, the contact area increases and there is a more intense heat exchange," said Oleg Kolenchukov, one of the lead authors of the study, a junior researcher at the Laboratory of Biofuel Compositions at SibFU.


According to him, the use of projections increases heat transfer by up to 11.5% and increases heat transfer by an average of 2.23 times. In addition, the protrusions create vortex formations inside the channel, which further enhances the heat exchange between the coolant and the raw material. By comparing the indicators of heat transfer and hydraulic resistance, the scientists determined the optimal combination of flow velocity and height of the protrusions.


Increasing the efficiency of heat transfer has a positive effect on the quality of hydrogen-containing mixtures and the volume of hydrogen produced, helps reduce the size of reactors, and minimizes secondary decomposition reactions, thereby reducing the amount of pollutants formed during pyrolysis, scientists say.


Recall that the activities of the Yenisei Siberia REC are aimed at improving the environmental situation in Russia and decarbonizing industry. The REC consists of 9 universities, 5 research institutes and 14 industrial enterprises.