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In-situ desulfurization using porous Ca-based materials for the oxy-CFB process: A computational study.
Eun Sol Go1, Beom-Sik Kim2, Jester Lih Jie Ling1
1Department of Environment and Energy, Jeonbuk National University, 567, Baekje-daero, Jeonju-si, jeollabuk-do, 54896, Republic of Korea.
Environmental Research
|March 1, 2023
Summary
This study simulates in-situ desulfurization in oxy-fuel circulating fluidized beds (CFBs) using computational particle fluid dynamics (CPFD). The model optimizes desulfurization efficiency by considering combustion and limestone reactions under various operating conditions.
Area of Science:
- Chemical Engineering
- Environmental Science
- Combustion Science
Background:
- Understanding gas-solid behavior in circulating fluidized beds (CFBs) is crucial for process design and operation.
- Minimizing environmental impact, particularly SOx emissions, necessitates advanced modeling and simulation for optimization.
- Current knowledge on simultaneous combustion and in-situ desulfurization modeling in CFBs under oxy-fuel conditions is limited.
Purpose of the Study:
- To investigate gas and solid behaviors in a pilot-scale CFB combustor under oxy-fuel conditions using CPFD.
- To model simultaneous combustion and in-situ desulfurization reactions within the CFB.
- To analyze the effects of operating parameters on desulfurization efficiency and optimize the process.
Main Methods:
- Utilized computational particle fluid dynamics (CPFD) numerical simulation based on the multiphase particle-in-cell (MP-PIC) method.
- Incorporated combustion and in-situ desulfurization reactions, including porosity and diffusion effects, into the CPFD model.
- Investigated the impact of fluidization number (U_LS/U_mf) on particle circulation and analyzed key parameters affecting desulfurization efficiency (temperature, Ca/S ratio, particle size distribution).
Main Results:
- The study confirmed that both direct and indirect desulfurization occur simultaneously in CFBs, influenced by thermodynamic equilibrium.
- Particle circulation rates and bed height in the standpipe were correlated with the fluidization number.
- Identified temperature, Ca/S molar ratio, and particle size distribution as sensitive indicators for limestone desulfurization efficiency.
Conclusions:
- The developed CPFD model accurately simulates gas-solid dynamics and simultaneous desulfurization in oxy-fuel CFBs.
- The model provides insights into optimizing in-situ desulfurization by understanding the interplay of various reactions.
- This research offers a valuable tool for enhancing the environmental performance of CFB processes through optimized desulfurization.
