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Go ES, Kim BS, Ling JLJ, Oh SS, Park HJ, Lee SH. In-situ desulfurization using porous Ca-based materials for the oxy-CFB process: A computational study. ENVIRONMENTAL RESEARCH 2023; 225:115582. [PMID: 36858302 DOI: 10.1016/j.envres.2023.115582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Revised: 02/18/2023] [Accepted: 02/25/2023] [Indexed: 06/18/2023]
Abstract
Within circulating fluidized bed (CFB) processes, gas and solid behaviors are mutually affected by operating conditions. Therefore, understanding the behaviors of gas and solid materials inside CFB processes is required for designing and operating those processes. In addition, in order to minimize the environmental impact, modeling to reduce pollutants such as SOx emitted from those processes is essential, and simulation reproduction is necessary for optimization, but little is known. In this study, the gas and solid behaviors in a pilot-scale circulating fluidized bed combustor were investigated by using computational particle fluid dynamics (CPFD) numerical simulation based on the multiphase particle-in-cell (MP-PIC) method under oxy-fuel combustion conditions. In particular, the combustion and in-situ desulfurization reactions simultaneously were considered in this CPFD model. Effect of fluidization number (ULS/Umf) was investigated through the comparison of particle circulation rates with regards to the loop seal flux plane and bed height in the standpipe. In addition, the effects of parameters (temperature, Ca/S molar ratio, and particle size distribution), sensitive indicators for the desulfurization efficiency of limestone, were confirmed. Based on the cycle of the thermodynamic equilibrium curve of limestone, it is suggested that direct and indirect desulfurization occur simultaneously under different operating conditions in CFB, creating an environment in which various reactions other than desulfurization can occur. Addition of the reaction equations (i.e., porosity, diffusion) to the established simple model minimizes uncertainty in the results. Furthermore, the model can be utilized to optimize in-situ desulfurization under oxy-CFB operating conditions.
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Affiliation(s)
- Eun Sol Go
- Department of Environment and Energy, Jeonbuk National University, 567, Baekje-daero, Jeonju-si, jeollabuk-do, 54896, Republic of Korea
| | - Beom-Sik Kim
- Hydrogen Research Center, Research Institute of Industrial Science and Technology, 67, Cheongam-ro, Nam-gu, Pohang-si, Gyeongsangbuk-do, 37673, Republic of Korea
| | - Jester Lih Jie Ling
- Department of Environment and Energy, Jeonbuk National University, 567, Baekje-daero, Jeonju-si, jeollabuk-do, 54896, Republic of Korea
| | - Seung Seok Oh
- Department of Environment and Energy, Jeonbuk National University, 567, Baekje-daero, Jeonju-si, jeollabuk-do, 54896, Republic of Korea
| | - Hyun Jun Park
- Department of Environment and Energy, Jeonbuk National University, 567, Baekje-daero, Jeonju-si, jeollabuk-do, 54896, Republic of Korea
| | - See Hoon Lee
- Department of Environment and Energy, Jeonbuk National University, 567, Baekje-daero, Jeonju-si, jeollabuk-do, 54896, Republic of Korea; Department of Mineral Resources Energy Engineering, Jeonbuk National University, 567, Baekje-daero, Jeonju-si, jeollabuk-do, 54896, Republic of Korea.
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Scale-up prediction of supercritical CO2 circulating fluidized bed boiler based on adaptive PSO-SVM. POWDER TECHNOL 2023. [DOI: 10.1016/j.powtec.2023.118328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
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Numerical Simulation of the Operating Conditions for the Reduction of Iron Ore Powder in a Fluidized Bed Based on the CPFD Method. Processes (Basel) 2022. [DOI: 10.3390/pr10091870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
In this work, the computational particle fluid dynamics (CPFD) method is used to simulate the high-pressure visual fluidized bed experimental equipment independently designed and developed by the experimentation of the fluidized reduction process of iron ore powder. A numerical model for reducing iron ore fines in a three-dimensional fluidized bed is established, and the model is verified by combining numerical simulation and experimental testing. Moreover, the influences of different reducing factors on the reduction effect in the process of the fluidized reduction of iron ore fines are simulated in detail. Via the CPFD simulation of the fluidized reduction of iron ore fines, the optimal reduction pressure is found to be 0.2 MPa, and the optimal reducing gas is found to be H2. Moreover, the optimal gas velocity is 0.6 m/s, and the optimal reduction temperature is 923 K. This conclusion is consistent with the experimental measurements, so the simulation results can be used to verify the reliability of the optimal operating conditions.
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Bandara JC, Moldestad BM, Eikeland MS. Circulating fluidized bed reactors – Experimental optimization of loopseal aeration and parametric study using CPFD simulations. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2022.117495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Liu Y, Xu Z, Tang M, Zhang Y, Zhang S. Experimental study on particle circulation characteristics of external circulating fluidized bed evaporator. KOREAN J CHEM ENG 2022. [DOI: 10.1007/s11814-021-0951-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Cui Y, Zhong W, Liu X, Xiang J. Study on scale-up characteristics in supercritical CO2 circulating fluidized bed boiler by 3D CFD simulation. POWDER TECHNOL 2021. [DOI: 10.1016/j.powtec.2021.08.028] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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