Increasing the efficiency of waste disposal
DOI:
https://doi.org/10.33271/crpnmu/83.220Keywords:
gasification, coal beneficiation waste, syngas, oxidizerAbstract
Purpose. To determine the gasification parameters for coal beneficiation waste, with consideration of the influence of oxidant composition and flow rate on the resulting syngas characteristics. The methods. The gasification process was studied using a multifunctional software package for thermochemical process modeling. This modeling tool enabled calculation of gas-phase composition and evaluation of main thermal and chemical parameters of the system. It also allowed to assess how changes in oxidant composition and flow rate affect syngas quality and overall gasification efficiency. Findings. The results showed that gasification performance is highly sensitive to oxidizer parameters. The maximum CO concentration was achieved at an oxidizer flow coefficient between 0.27 and 0.30. Increasing the oxidizer flow reduced the proportion of reducing components and increased the oxidizing species. In particular, H2 concentration decreased while H2O content increased with higher oxidizer flow rates. The study also found that maintaining a gasification temperature of 1873-1973 K requires oxygen enrichment of the air to at least 35%. This ensures syngas composition with approximately 80% reducing and 14% oxidizing components. The originality. The study established the influence of oxidizer composition and flow rate on the efficiency of gasifying coal beneficiation waste, including both middling and slurry. It identified optimal temperature conditions for maximizing the reducing component content in the syngas. It was found that increasing the oxygen concentration in the oxidizer significantly enhances the share of reducing gases, while keeping oxidizing components within controlled limits. These findings provide a scientifically grounded basis for optimizing high-temperature gasification technologies for coal beneficiation waste. Practical implementation. The derived gasification characteristics can be used in the design and modernization of energy systems intended for the utilization of coal-based waste at coal beneficiation facilities. The identified oxidizer parameters make it possible to maintain a stable thermal regime and generate syngas with predictable composition. This is essential for the development of autonomous power supply systems. Applying these results can improve energy efficiency, reduce dependence on external energy sources, and minimize environmental impact at industrial sites.References
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