Numerical simulation of preparation of ultrafine cerium oxides using jet-flow pyrolysis

Lv, Chao; Zhang, Dou; Zhao, Qiuyue

doi:10.1007/s12598-019-01337-9

Cited by 8 publications

(5 citation statements)

References 25 publications

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“…According to the relationship between the amount of replenished material and the additional pressure and gas phase inlet flow, P = 1.62V 2 − 1.55V -0.97, the P and V factors should be combined [23]. In order to increase the reactor input by a factor of 1000, the required amount of CeCl3 was 42.96 kg/h, and the material intake was 826.1538 kg/h.…”

Section: Reactor Ampificationmentioning

confidence: 99%

“…This paper focuses on the effects of various related factors on the amount of material entering in the reactor. In order to find a suitable design method to amplify the reactor, the same materials (fixed physical property parameter (p)) were selected according to above-mentioned Equation (13); the jet pyrolysis reactor was amplified with the same geometrical ratio with a fixed n = 10/5, µ = 0.0000172 Pa·s, and the following can be obtained: (14) According to the relationship between the amount of replenished material and the additional pressure and gas phase inlet flow, P = 1.62V 2 − 1.55V − 0.97, the P and V factors should be combined [23]. In order to increase the reactor input by a factor of 1000, the required amount of CeCl 3 was 42.96 kg/h, and the material intake was 826.1538 kg/h.…”

Section: Reactor Ampificationmentioning

confidence: 99%

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Simulation of the Scale-up Process of a Venturi Jet Pyrolysis Reactor

Lv¹,

Zhang²,

Hao³

2019

Metals

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Micro- and nano-sized cerium oxide particles can be prepared through pyrolyzing cerium chloride solution directly in the venturi jet pyrolysis reactor. Micro- and nano-sized cerium oxide particles have better performance and higher application value. To increase the production of micro-and nano-sized cerium oxide, it is necessary to scale up the venturi jet pyrolysis reactor. According to the geometric similarity principle, the scale-up of the venturi jet pyrolysis reactors utilize dimensional analysis methods, with FLUENT13.0 and user-defined functions, following the mathematical simulation of the resulting enlarged reactors. After the dimensional analysis, the empirical formula obtained between the reactants and all the parameters is Q = 2.240727 × 10−4P0.004568ρ0.26223d−0.24801V1.25714n0.076479μ−0.26628, and the geometrical scale-up of the reactors needs to follow V = 0.0209d0.196. The results in this study can provide data support for the future optimization and amplification of reactors.

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Section: Reactor Ampificationmentioning

confidence: 99%

Section: Reactor Ampificationmentioning

confidence: 99%

Simulation of the Scale-up Process of a Venturi Jet Pyrolysis Reactor

Lv¹,

Zhang²,

Hao³

2019

Metals

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“…Lv et al [12][13][14] proposed a new process for the preparation of metal oxides by direct pyrolysis of a solution containing a rare earth chloride, magnesium chloride, and pickling waste hydrochloric acid, which incorporated a Venturi Reactor that atomized the solution using the heat generated by the combustion of methane to provide energy for the phase change of the solution and the pyrolysis of the metal chloride solution to obtain high-quality metal oxides. The structure of Venturi reactor contributes to a sharp increase of gas velocity at the throat.…”

Section: Introductionmentioning

confidence: 99%

Simulation study of citric acid effects on pyrolysis of hydrochloric acid pickling waste liquor

Yin

Sun

et al. 2023

CI&CEQ

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During pyrolysis of hydrochloric acid pickling waste liquid in a Venturi Reactor from iron and steel enterprises, the reaction products agglomera ted and hindered product recovery. Addition of citric acid to materials at the inlet improved product distribution. In this paper, a numerical simulation of the combustion, phase change, and gas-solid chemistry involved in a citric acid-added pickling waste liquid was conducted. These results showed that citric acid added to the inlet resulted in a peak concentration of carbon dioxide (CO2) in the back half of the venturi throat, and some ferric oxide (Fe2O3) underwent a secondary reaction to afford ferroferric oxide (Fe3O4). As the addition of citric acid increased, the flow of Fe2O3 at the outlet first increased and then decreased, while the flow rate of Fe3O4 first decreased and then increased. When the ratio of citric acid was 7%, the flow rate of Fe2O3 was the smallest and the flow rate of Fe3O4 was the largest.

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“…In addition, this method ensures the independent growth of particles among atomized droplets and allows a narrow particle size distribution. In comparison with previous research which has indicated that spray pyrolysis cannot sufficiently control the morphology and structure of CeO 2 , this method can be used to quickly and efficiently prepare CeO 2 [ 18 , 19 ]. The size of the prepared CeO 2 particles can reach the micro-nano scale, but the occurrence of serious agglomeration reduces the specific surface area.…”

Section: Introductionmentioning

confidence: 99%

Green and Short Preparation of CeO2 Nanoparticles with Large Specific Surface Area by Spray Pyrolysis

Bian

et al. 2021

Materials

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Green and short preparation of CeO2 nanoparticles with large specific surface area from rare earth extraction (CeCl3) was successfully achieved by spray pyrolysis (SP). In this method, a precursor solution is first prepared by mixing CeCl3, C6H8O, and H2O in the requisite quantities. Subsequently, the precursor consisting of a mixture of CeO2 and C was obtained by SP method by using the precursor solution. Finally, the calcination at 500 °C~800 °C in air for two hours to transform the precursor to CeO2 nanoparticles. Thermodynamic analysis and experimental studies were performed to determine the optimal SP temperature and citric acid amount. The results indicated that the maximum specific surface area (59.72 m2/g) of CeO2 nanoparticles were obtained when the SP temperature was 650 °C and the molar ratio of citric acid to CeCl3 was 1.5.

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Numerical simulation of preparation of ultrafine cerium oxides using jet-flow pyrolysis

Cited by 8 publications

References 25 publications

Simulation of the Scale-up Process of a Venturi Jet Pyrolysis Reactor

Simulation of the Scale-up Process of a Venturi Jet Pyrolysis Reactor

Simulation study of citric acid effects on pyrolysis of hydrochloric acid pickling waste liquor

Green and Short Preparation of CeO2 Nanoparticles with Large Specific Surface Area by Spray Pyrolysis

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