http://kims-imio.com/index.php/main/issue/feedKompleksnoe Ispolzovanie Mineralnogo Syra = Complex use of mineral resources2026-09-09T09:28:18+00:00Gulzhaina Kassymovajournal.kims.2025@gmail.comOpen Journal Systemshttp://kims-imio.com/index.php/main/article/view/833The environmental efficiency of the combined combustion of low grade Ekibastuz coal and plant biomass2026-08-24T04:41:03+00:00S.K. Myrzaliyevasaulekerchaiz@mail.ruSh.K. Akilbekovash_akylbekova74@mail.ruH. Retnawatiheri_retnawati@uny.ac.idS.V. Yermishinesv-ret@mail.ru <p>This article presents the results of a study on the layered combustion of low-grade Ekibastuz coal blended with biomass additives aimed at improving the energy efficiency and environmental sustainability of small- and medium-scale energy systems. Corn waste, which is a by‑product of agro‑industrial production, was used as a bio‑additive. Comprehensive physico-chemical analysis of the original components was carried out, including determination of their calorific value. Based on the obtained data, fuel mixtures with different biomass contents were prepared, which allowed an in-depth analysis of co-combustion processes and the relationship between the proportion of biomass, the calorific value of the mixture, the combustion efficiency, and the level of pollutant emissions to be determined. The results showed that the most optimal composition is a fuel mixture with a biomass content in the range of 20-30% and coal in the range of 70-80%, providing the best combination of energy and environmental performance. Calculations and experimental studies of layered combustion parameters in installations with a fixed layer have been performed. It was demonstrated that the addition of 20–30% biomass intensifies the combustion process, increases the overall calorific value of the fuel blend, and reduces the concentration of harmful substances in flue gases compared to the combustion of pure coal. Rational process conditions have been defined, including the optimal height of the fuel layer, temperature regimes, and combustion duration. The results confirm the high prospects of using fuel mixtures based on low-grade coal and biomass as a cleaner and more sustainable solution for heat supply of small and medium-sized energy systems in Kazakhstan.</p>2026-09-09T00:00:00+00:00Copyright (c) 2026 S.K. Myrzaliyeva, Sh.K. Akilbekova, H. Retnawati, S.V. Yermishin