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On the influence of heating rate on the process of oxidative pyrolysis of municipal solid waste

O.B. Kolibaba, R.N. Gabitov, D.A. Dolinin, N.S. Molkov

Vestnik IGEU, 2026 issue 2, pp. 5—12

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Abstract in English: 

Background.  Converting municipal solid waste (MSW) into energy ranks as one of the priority areas of Russia energy politics. Utilizing thermal processing techniques to recycle MSW, such as dry and oxidative pyrolysis is a cost-effective, environmentally friendly and technically feasible approach. The essential parameters of the pyrolysis process that determine the ratio of the obtained products include the morphological characteristics and heating rate of the feedstock, the concentration of oxygen in the reactor active zone (in case of oxidative pyrolysis), and the operational temperature. Experimental research methods allow us to assess the impact of these factors on the process. Despite its versatility due to its ability to process waste of various fractional compositions and aggregation states, oxidative pyrolysis has not gained widespread acceptance due to the lack of process parameters in installations. Therefore, the study of the oxidative pyrolysis of MSW using modern experimental research tools is relevant.

Materials and methods. The study of the decomposition process of MSW has been carried out using a complex thermal method including thermogravimetry, differential scanning calorimetry and mass spectrometric analysis of gaseous products.

Results. It has been found that increasing the heating rate from 5 to 15°C/min reduces the heat treatment time by a factor of three, but is accompanied by a decrease in the energy efficiency of the process. At a heating rate of 5°C/min, the maximum thermal effect (4250 J/g) and the heat of combustion of pyrolysis gas (11,07 MJ/kg) have been recorded, along with the minimum yield of solid residue (5,86 %). Increasing the heating rate leads to a shift of decomposition temperatures to the high-temperature region and a decrease of the yield of energy-valuable gas components.

Conclusions During the studies, optimal temperature parameters have been determined for a heating rate of 5°C/min to maintain the process of oxidative pyrolysis of waste in thermal reactors with the highest energy yield.

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Key words in Russian: 
твердые коммунальные отходы, окислительный пиролиз, синхронный термический анализ, масс-спектрометрия, термогравиметрический анализ, дифференциально-сканирующая калориметрия
Key words in English: 
municipal solid waste, oxidative pyrolysis, synchronous thermal analysis, mass spectrometry, thermogravi-metric analysis, differential scanning calorimetry
The DOI index: 
10.17588/2072-2672.2026.2.005-012
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