Fouling characteristics of 90° elbow in high salinity wastewater from coal chemical industry

doi:10.1016/j.cjche.2020.09.034

Chinese Journal of Chemical Engineering ›› 2021, Vol. 35 ›› Issue (7): 143-151.DOI: 10.1016/j.cjche.2020.09.034

• Fluid Dynamics and Transport Phenomena • Previous Articles Next Articles

Fouling characteristics of 90° elbow in high salinity wastewater from coal chemical industry

Yang Lü, Kai Lu, Youxiang Bai, Yulong Ma, Yongsheng Ren

State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Department of Chemistry & Chemical Engineering, National Demonstration Center for Experimental Chemistry Education, Ningxia University, Yinchuan 750021, China

Received:2020-06-16 Revised:2020-08-23 Online:2021-09-30 Published:2021-07-28
Contact: Yongsheng Ren
Supported by:
This work was financially supported by the Natural Science Foundation of Ningxia Hui Autonomous Region (2020AAC03025), Undergraduate Training Programs for Innovation (2019107490001), East-West Cooperation Project of Ningxia Key R & D Plan(2017BY064) and National First-rate Discipline Construction Project of Ningxia (NXYLXK2017A04).

Fouling characteristics of 90° elbow in high salinity wastewater from coal chemical industry

Yang Lü, Kai Lu, Youxiang Bai, Yulong Ma, Yongsheng Ren

State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Department of Chemistry & Chemical Engineering, National Demonstration Center for Experimental Chemistry Education, Ningxia University, Yinchuan 750021, China

通讯作者: Yongsheng Ren
基金资助:
This work was financially supported by the Natural Science Foundation of Ningxia Hui Autonomous Region (2020AAC03025), Undergraduate Training Programs for Innovation (2019107490001), East-West Cooperation Project of Ningxia Key R & D Plan(2017BY064) and National First-rate Discipline Construction Project of Ningxia (NXYLXK2017A04).

Abstract

Abstract: Due to the high salt content of coal chemical wastewater, pipeline fouling often occurs during wastewater treatment. Fouling will cause the diameter of the pipe to shrink or even block, which is not conducive to the safe and stable operation of the wastewater treatment process. In this paper, the experimental device was designed by using FLUENT software and the fouling deposition mechanisms at different flow velocities and different positions in a 90 deg bend were studied. The experimental results show that when the flow velocity is between 0.2 m·s^-1 and 0.3 m·s^-1, the thickness of fouling layer was positively correlated with the flow velocity; when the flow velocity is equal to 0.4 m·s^-1, the formation of fouling is the most serious; when the flow velocity is between 0.4 m·s^-1 and 0.7 m·s^-1, the thickness of fouling layer was negative correlation with the flow velocity; with the increase of inlet velocity, the time for sediment point to develop into sediment surface is shortened. The fouling layer is easy to fall off because of the large shear force on the wall surface of the inner bend of the 90° elbow, so the density of sediment at this position is high.

Key words: Fouling, Waste water, CFD, Inlet velocity

摘要： Due to the high salt content of coal chemical wastewater, pipeline fouling often occurs during wastewater treatment. Fouling will cause the diameter of the pipe to shrink or even block, which is not conducive to the safe and stable operation of the wastewater treatment process. In this paper, the experimental device was designed by using FLUENT software and the fouling deposition mechanisms at different flow velocities and different positions in a 90 deg bend were studied. The experimental results show that when the flow velocity is between 0.2 m·s^-1 and 0.3 m·s^-1, the thickness of fouling layer was positively correlated with the flow velocity; when the flow velocity is equal to 0.4 m·s^-1, the formation of fouling is the most serious; when the flow velocity is between 0.4 m·s^-1 and 0.7 m·s^-1, the thickness of fouling layer was negative correlation with the flow velocity; with the increase of inlet velocity, the time for sediment point to develop into sediment surface is shortened. The fouling layer is easy to fall off because of the large shear force on the wall surface of the inner bend of the 90° elbow, so the density of sediment at this position is high.

关键词: Fouling, Waste water, CFD, Inlet velocity

Yang Lü, Kai Lu, Youxiang Bai, Yulong Ma, Yongsheng Ren. Fouling characteristics of 90° elbow in high salinity wastewater from coal chemical industry[J]. Chinese Journal of Chemical Engineering, 2021, 35(7): 143-151.

Yang Lü, Kai Lu, Youxiang Bai, Yulong Ma, Yongsheng Ren. Fouling characteristics of 90° elbow in high salinity wastewater from coal chemical industry[J]. 中国化学工程学报, 2021, 35(7): 143-151.

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Fouling characteristics of 90° elbow in high salinity wastewater from coal chemical industry

Fouling characteristics of 90° elbow in high salinity wastewater from coal chemical industry

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