The Chinese Journal of Process Engineering >
Numerical simulation of hollow catalyst with pores in gas-solid reaction system
Received date: 2020-07-20
Revised date: 2020-08-07
Online published: 2021-07-27
In the gas-solid flow, fluid and particle usually aggregate to form dense-phase and dilute-phase respectively, resulting in unbalanced mass transfer and reaction rates between the dense- and dilute-phase. The unbalance of dilute- and dense-phase reduces the overall efficiency of the reactor. To solve this problem, a hollow catalyst particle with pores structure is designed. It is aimed to enhance the overall efficiency of fluidized reactors by improving the mass transfer rate between the dense- and dilute-phase. Dense- and dilute-phase are widely distributed during fluidization processes, which can be respectively described by the cluster system and single particle system. In these two phases, the flow, reaction process and mass transfer process of hollow porous particles are studied by numerical simulation, and compared with the solid spherical particle system at the same fluidization condition. Then, the frequency of particle clusters formation and breakage is studied under various fluidization conditions. The time scale is analyzed to measure the possibility of gas transport in the fluidization process. It is found that the time-scales of the mass transfer, the reaction, and the movements of particles between the dilute- and dense-phase could be at the same order for some fluidization conditions. Thus, hollow porous catalyst particle can store the reacting material in the dilute-phase efficiently. When moving to the dense phase, the particle would release the reacting material to provide additional material for the dense-phase reaction. When the reaction is faster than the mass transfer, the overall reaction rate of the hollow porous catalyst system is 26.92%~29.55% higher than that of the solid spherical catalyst system at the studied conditions. It could be predicted that this hollow porous catalyst would be capable to improve the overall reaction efficiency of large gas-solid fluidized bed reactors due to wider distributions of the dilute- and dense-phase.
Qiuying WU , Lingkai KONG , Ji XU , Wei GE , Shaojun YUAN . Numerical simulation of hollow catalyst with pores in gas-solid reaction system[J]. The Chinese Journal of Process Engineering, 2021 , 21(7) : 774 -785 . DOI: 10.12034/j.issn.1009-606X.220229
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