Scientists from Tomsk Polytechnic University have found a way to accelerate the pyrolysis of low-grade coal by adding waste engine oil and sawdust to the raw material. As reported by TASS in the Russian Ministry of Education and Science, this approach increases the integral fuel efficiency by 4–10% compared to pure coal and reduces the thermal decomposition time several times over.
The best result was shown by a mixture of 50% brown coal, 40% water, and 10% waste oil — a 10% increase in efficiency. The addition of 10% sawdust resulted in a 4% increase. The additives initiate pyrolysis at a lower temperature — the start of the process is reduced by up to 26%, and the decomposition rate increases by 7%. Large coal particles react more easily than small ones due to better heat transfer, which contradicts intuitive expectations.
Empirical formulas obtained during experiments predict the thermal decomposition process with an error of no more than 30%. For 40% of the world's solid fuel reserves, which consist of low-grade coals with poor calorific value, this turns waste raw materials into technological fuel.
Empirical formulas obtained during experiments predict the thermal decomposition process with an error of no more than 30%. For 40% of the world's solid fuel reserves, which consist of low-grade coals with poor calorific value, this turns waste raw materials into technological fuel.
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