Experimental and numerical investigations on heterogeneous condensation of insoluble particles in the fluid catalytic cracking unit

Wang, Jiarui; Wang, Simin; Duan, Xudong; Wen, Jian; Tu, Jiyuan

doi:10.1016/j.powtec.2020.11.031

Cited by 8 publications

(6 citation statements)

References 39 publications

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“…The experiments have been carried out in our previous studies. [ 44,48 ] As shown in Figure 3A, when the desiccative particle is smaller than 2.5 μm, the removal efficiency of the cyclone is less than 50%. In Figure 3B, when the particle size increases from 2.79 to 4.74 μm by the heterogeneous condensation process, the removal efficiency increases from 80.67% to 95.12% as the gas flow rate increases from 100 to 169 Nm 3 h −1 .…”

Section: Methodsmentioning

confidence: 99%

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Multi‐object optimization study on the performance of gas cyclones based on heterogeneous condensation and turbulent agglomeration

et al. 2023

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Improving the separation efficiency of fine particles becomes more and more critical as environmental pollution aggravates. This study aims to investigate the effects of four key parameters on the performance of gas cyclones, including cyclone body height, particle concentration, initial supersaturation degree, and inlet temperature. Then, the two‐way coupling numerical model, in which is the process of heterogeneous condensation and agglomeration for insoluble fine particles, was achieved by user defined function. On this basis, the response surface analysis method and multi‐objective genetic algorithm were adopted to optimize the cyclone. The results show that when the particle concentration is less than 1000 mg/m3, the separation efficiency can reach above 95%. The initial supersaturation degree has the greatest effect on the separation efficiency and vapour consumption rate, while the cyclone body height is the most critical factor on the pressure drop. As the particle concentration increases, the separation efficiency decreases at first and then keeps almost stable. With the increase of inlet temperature, the separation efficiency is enhanced, and the pressure drop reduces. These research results can provide important guidance for the optimization and engineering application of this technology.

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Section: Methodsmentioning

confidence: 99%

“…In order to reduces the computational cost, the splash phenomenon on the walls is ignored. [44] T A B L E 1 The range of input parameters. F I G U R E 1 Conventional configuration of a tangential gas cyclone.…”

Section: The Agglomeration Processmentioning

confidence: 99%

Multi‐object optimization study on the performance of gas cyclones based on heterogeneous condensation and turbulent agglomeration

et al. 2023

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“…A large number of fine particles in gas provide cores that benefit vapor to condensate. When the ratio between the experimental vapor concentration and the saturated vapor concentration at the current temperature is larger than the critical value S cr , the embryo on the particle will form as shown in Figure . , …”

Section: Methodsmentioning

confidence: 99%

“…When the ratio between the experimental vapor concentration and the saturated vapor concentration at the current temperature is larger than the critical value S cr , the embryo on the particle will form as shown in Figure 5. 28,51 The free energy of the formation of an embryo can be obtained by following equations:…”

Section: Particle Growth Modelmentioning

confidence: 99%

“…Recently, in terms of the heterogeneous condensation mechanism, Xu et al used an environmental scanning electron microscopy system to directly visualize the heterogeneous condensation process on insoluble particle surfaces and found that the Fletcher theoretical critical supersaturation was higher than that experimentally measured. − Xiong et al proposed a heterogeneous nucleation model based on the Fletcher classical nucleation theory and molecular kinematics theory, considering the effect of surface diffusion mechanism of water vapor molecules, line tension, and roughness . Yin et al, Yu et al, Natale et al, Tammaro et al, and Wang et al conducted several experiments on the heterogeneous condensation of different particles in a growth tube and analyzed the effect of gas or vapor temperature, particle concentration, gas composition, wetting agent, and magnetic field. − Zhang et al discussed the influence of the particle size, chemical composition, and mass fraction of components on the heterogeneous nucleation critical condition based on the classical Köhler theory …”

Section: Introductionmentioning

confidence: 99%

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Pilot-Scale Investigation on a Spraying Pretreatment Process Integrated with an Axial Flow Cyclone to Separate Fine Particles with Low Energy Consumption

Wang,

Song,

Liu

et al. 2023

Ind. Eng. Chem. Res.

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This study was designed to explore the synergistic enhancement of the spraying pretreatment section and axial flow cyclone on the separation of particles from gases. First, in the spraying pretreatment section, the effects of the gas flow rate, droplet flow rate, droplet diameter, and gas or droplet temperature on the collection efficiency of the particles and the supersaturation degree were analyzed. Then, the nucleation and growth process of fine insoluble particles were discussed. At last, combined with an axial flow cyclone, the influences of operating parameters on the separation efficiency and energy consumption were presented. Our results show that the spraying pretreatment can capture 80% of particles larger than 5 μm and can maintain a supersaturated environment. Fine particles (PM1.0) will be aggregated to above 6 μm quickly and removed in the axial flow cyclone with a separation efficiency of above 98%. In addition, the energy consumption of the integrated purification process in this study is reduced by 20.65%, on average, compared to that of an electrostatic precipitator. These findings provide new insights into the separation of fine particles in industrial applications.

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Numerical simulation and structure optimization of spiral wound heat exchanger with novel spacing bars

Duan,

Zhou,

Xiao

et al. 2023

Can J Chem Eng

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Spiral wound heat exchangers are widely used in industrial production for their advantages, such as large heat transfer areas and compact structures. However, their compact design also poses significant difficulties for numerical simulation and experimental research. The spacing bar between tube bundles has an essential impact on the performance of wound tube heat exchangers. This paper presents a new type of spacing bar vertically installed on the core barrel of the spiral wound heat exchanger to enhance the comprehensive heat transfer performance. A numerical model of a new type of wrapped tube heat exchanger has been constructed, which agrees with experimental results. Under the same working conditions, the comprehensive heat transfer performance on the shell side of the spiral wound heat exchanger with new spacing bars is increased by 7.4%–10.5% compared with the traditional structure. On this basis, the influence of the new spacing bar's structural parameters on the heat exchanger's performance was studied, and the empirical correlation between the structural parameters and operating conditions of the new spacing bar and the performance of the heat exchanger was fitted. The research results have guiding significance for the design of spiral wound heat exchangers.

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Experimental and numerical investigations on heterogeneous condensation of insoluble particles in the fluid catalytic cracking unit

Cited by 8 publications

References 39 publications

Multi‐object optimization study on the performance of gas cyclones based on heterogeneous condensation and turbulent agglomeration

Multi‐object optimization study on the performance of gas cyclones based on heterogeneous condensation and turbulent agglomeration

Pilot-Scale Investigation on a Spraying Pretreatment Process Integrated with an Axial Flow Cyclone to Separate Fine Particles with Low Energy Consumption

Numerical simulation and structure optimization of spiral wound heat exchanger with novel spacing bars

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