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Abstract
This paper investigates the problem of gas-liquid flow SO2 removal in nonquiescent flue gas. Using venturi scrubber as the prototype, the population balance model (PBM) combined with the CFD is implemented to characterize the droplets behaviors. Discrete methods as class model (CM) and various quadrature-based moment models (QBMMs) are applied to numerically solve the population balance equations (PBEs). Taking NaOH solution as the reaction kinetics, the sulfur removal efficiency simulation with CM and different QBMMs methods is validated through the operation measurements. The comparison results show that the CM can achieve better accuracy with more bins, which showed the minimal error 3.6%, consisting 30 bins. However, the computational time of the CM is approximately 19.3 times as long as QBMMS. Among the QBMMs, the ECQMOM approach enjoys the best balance between the simulation efficiency and accuracy, while EQMOM shows the least computational load and CQMOM wins the minimal calculation precision. This result will provide sufficient reference for engineers working in the field of the droplets distribution in the venturi scrubber design.
Highlights
As the main pollutant in the petroleum industry, exhaust gas from fuel contains a significant amount of SO2 owing to the sulfur contained in fossil fuels [1]. e emissions of SO2 severely cause atmosphere pollution and ecosystem damage, which significantly threatens the human life
Conclusion e Sauter Mean Diameter (SMD) of droplets plays a fundamental role in the CFD study of multiphase flow via venturi scrubber under industrial operating conditions
population balance model (PBM) is coupled with CFD simulations to account for dispersed phase behavior. e results of velocity, pressure, and volume faction can illustrate the accuracy of the simulation
Summary
As the main pollutant in the petroleum industry, exhaust gas from fuel contains a significant amount of SO2 owing to the sulfur contained in fossil fuels [1]. e emissions of SO2 severely cause atmosphere pollution and ecosystem damage, which significantly threatens the human life. E venturi that is investigated in this paper is a device used to absorb sulfur dioxide, which is installed at the end of production line as an equipment to clean the flue gas. This paper aims at finding the most suitable simulation method of the venturi. Most reactors use low-density medium as the discrete phase to study the dynamics characteristics of particles. The discrete phase of the venturi selected in this paper is liquid. In this case, the behavior of particles such as growth, breakup, and aggregation is more affected by its own stress, which is different from the situation of gas as the discrete phase. The paper studies the condition of the internal flow field and adaptability of different discrete methods to the venturi firstly. The paper studies the condition of the internal flow field and adaptability of different discrete methods to the venturi firstly. e condition of the flow can show the process of the mass and energy transfer, which could indicate the direction
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