Analysis of the influence of moisture in steelmaking gases on the lower heating value and thermal performance
Eder Quental de Araújo; José Geraldo da Silva Moreira; Dimas Pereira Coura; Adler Mendonça Fonseca
Abstract
Steelmaking gases are key energy sources in integrated coke-based steel plants, but their high moisture content— introduced during wet gas cleaning—can significantly reduce combustion efficiency. This study quantifies the impact of residual moisture on the lower heating value (LHV) of blast furnace gas (BFG) and its effect on boiler thermal performance. A thermodynamic model was developed to calculate dry, wet, and useful LHV, incorporating psychrometric principles and process conditions. Results show that moisture can reduce the effective LHV by up to 12%, leading to higher specific fuel consumption and financial losses, especially on hot days when condensation is limited. The findings emphasize the need to adjust control systems and performance indicators to account for moisture, ensuring accurate energy management and improved operational efficiency.
Keywords
Referências
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Submetido em:
22/10/2025
Aceito em:
19/03/2026
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