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Mao Y, Zhang W, Li H, Chen Q, Kasomo RM, Luo H, Song S. Utilization of Fenton oxidation approach in wet phosphoric acid process for mitigating foam generation. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Ochi Y, Takenaka K, Komoda Y, Ohmura N. Friction Factor Distribution at the Side Wall of a Turbulent Agitated Vessel with Baffles Using a MAXBLEND Impeller. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.1c04229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yusuke Ochi
- Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe-shi, Hyogo 657-8501, Japan
| | - Katsuhide Takenaka
- Sumitomo Heavy Industries Process Equipment Co., Ltd, 1501 Imazaike, Saijo, Ehime 799-1362, Japan
| | - Yoshiyuki Komoda
- Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe-shi, Hyogo 657-8501, Japan
| | - Naoto Ohmura
- Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe-shi, Hyogo 657-8501, Japan
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Sato E, Ochi Y, Horiguchi H, Takenaka K, Wu J, Parthasarathy R, Komoda Y, Ohmura N. Effect of Baffle Clearance on Scale Deposition in an Agitated Vessel. ACS OMEGA 2021; 6:24070-24074. [PMID: 34568685 PMCID: PMC8459426 DOI: 10.1021/acsomega.1c03503] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/04/2021] [Indexed: 06/13/2023]
Abstract
The material deposition in a mixing tank agitated by the MAXBLEND impeller in a turbulent state was quantified and compared between cases with and without baffle clearance. Magnesium hydroxide formed from the chemical reaction between calcium hydroxide and magnesium chloride was used as a model of scale formation. Flow velocity in the tank was investigated by employing computational fluid dynamics simulation and experimentally validated by an ultrasonic velocity profiler method. Results showed that the amount of scale decreased with the increase in the rotational speed of the impeller due to the erosion effect on the tank wall. In the case without baffle clearance, the smaller weight of the scale was deposited on the front of the baffle plate due to the flow impingement, which enhanced the removal of the scale deposition. However, the lower-velocity magnitude behind the baffles resulted in an enhancement in the formation of scale. Installation of baffle clearance caused a contraction flow in between the tank wall and baffles, and consequently, the higher flow velocity reduced the amount and thickness of the scale. Measurement of the torque showed that the baffle clearance did not affect the power consumption, so the installation of baffle clearance can be a promising approach to reduce scale deposition in terms of saving operational costs and increasing process efficiency and safety.
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Affiliation(s)
- Eri Sato
- Department
of Chemical Science and Engineering, Kobe
University, 1-1 Rokkodai-cho, Nada-ku, Kobe-shi 657-8501, Hyogo, Japan
| | - Yusuke Ochi
- Department
of Chemical Science and Engineering, Kobe
University, 1-1 Rokkodai-cho, Nada-ku, Kobe-shi 657-8501, Hyogo, Japan
| | - Hiroo Horiguchi
- Sumitomo
Heavy Industries Process Equipment Co., Ltd, 1501 Imazaike, Saijo 799-1362, Ehime, Japan
| | - Katsuhide Takenaka
- Sumitomo
Heavy Industries Process Equipment Co., Ltd, 1501 Imazaike, Saijo 799-1362, Ehime, Japan
| | - Jie Wu
- CSIRO
Mineral Resources, Bayview
Avenue, Clayton 3168, Australia
| | | | - Yoshiyuki Komoda
- Department
of Chemical Science and Engineering, Kobe
University, 1-1 Rokkodai-cho, Nada-ku, Kobe-shi 657-8501, Hyogo, Japan
| | - Naoto Ohmura
- Department
of Chemical Science and Engineering, Kobe
University, 1-1 Rokkodai-cho, Nada-ku, Kobe-shi 657-8501, Hyogo, Japan
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CFD simulations of early- to fully-turbulent conditions in unbaffled and baffled vessels stirred by a Rushton turbine. Chem Eng Res Des 2021. [DOI: 10.1016/j.cherd.2021.04.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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