Research on Modeling and Variable Operating Condition Characteristics of Entrained Flow Coal Gasifier Based on Aspen Plus

ObjectivesThis research aims to investigate the operational mechanism of a coal gasifier within an integrated gasification combined cycle (IGCC) power plant, with a focus on analyzing and optimizing key operational parameters.MethodsA steady-state thermodynamic model of the gasifier was developed using Aspen Plus. The model’s accuracy was validated by comparing its simulation results with published data. A sensitivity analysis was then conducted to assess the impact of key gasifier parameters.ResultsThe thermodynamic model demonstrates the suitability for simulating steady-state coal gasification processes. The model exhibits high accuracy, simplified structure, and efficient computational performance.ConclusionsThe sensitivity analysis reveals that the oxygen-to-coal ratio holds the most significant influence on the coal gasification process. Both insufficient and excessive oxygen levels result in a reduction of syngas active ingredient production. The optimal oxygen-to-coal ratio for the Shell gasifier model is determined to be approximately 0.85. Water-to-coal ratio also plays a critical role in the gasification process. When sufficient energy is present within the gasifier, increasing the water input leads to higher water content in the syngas, potentially increasing hydrogen concentration. However, excessive water input under energy-constrained conditions can decrease the effective composition of the syngas.