[논문]CFD를 활용한 수처리공정 대형관에서 압력수 혼합공정 평가

조영만; 유현철; 장경혁; 정용준

doi:10.15681/kswe.2021.37.3.168

CFD를 활용한 수처리공정 대형관에서 압력수 혼합공정 평가
Evaluation of Pressurized Water Mixing of Big Pipe with CFD at Water Treatment Process 원문보기

한국물환경학회지 = Journal of Korean Society on Water Environment, v.37 no.3, 2021년, pp.168 - 174

조영만 (부산상수도사업본부 수질연구소) , 유현철 (부산상수도사업본부 수질연구소) , 장경혁 (부산상수도사업본부 수질연구소) , 정용준 (부산가톨릭대학교 환경공학과)

Abstract ▼ AI-Helper

Mixing is a very important unit in water treatment process. A mechanical stirring method is generally used for mixing, but recently, the use of pressurized water mixing method (pump diffusion flash mixer) has gained interest because it is more advantageous in terms of mixing time, noise, energy consumption, and maintenance. The following conclusions were obtained from the study of pressurized water mixing method by Computational Fluid Dynamics. Firstly, the mixing degree in the pipe increased as the density of water increased. Secondly, even if the relative velocity between flow rate in the pipe and the pressurized water was constant, the mixing degree decreased as the flow velocity in the pipe increased. Thirdly, the stronger the injection energy the higher the mixing degree. It was also found that the mixing degree was greatly affected by the injection velocity as compared to the injection flow amount. Finally, the required energy to achieve 95% mixing degree at the distance of 10 times diameter in big pipes of 500 mm to 3000 mm was 0.3 to 4.5 kJ. The result of this study could be used in the process design of injection with water purification chemicals, such as, ozone, chlorine, and coagulant.

주제어

표/그림 (16)

그림 Fig. 1. Injection direction and diameter distance at the big pipe.
표 Table 1. Flow rate and Kinetic energy depending on injection diameter and flow velocity (Unit: m³/hr, kJ)
표 Table 2. Evaluation condition of uniformity index
그림 Fig. 2. Cross-sectional view of mesh around the injection pipe.
그림 Fig. 3. Profile of velocity by pressurized water injection in the pipe.
그림 Fig. 4. Mixing degree at water temperature 27℃ and 4℃.
표 Table 3. Ranking of kinetic energy (Unit: Ranking)
그림 Fig. 5. Difference in mixing degree at water temperature 27℃ and 4℃.
그림 Fig. 7. Mixing degree depending on diameter and velocity of injection in the 500 mm pipe.((a) : 10 mm injection pipe, (b) : 20 mm, (c) : 30 mm, (d) : 40 mm).
그림 Fig. 6. Mixing degree depending on fluctuation of ground velocity in the pipe.
그림 Fig. 8. Mixing degree depending on diameter and velocity of injection in the 1,000 mm pipe.((a) : 10 mm injection pipe, (b) : 20 mm, (c) : 30 mm, (d) : 40 mm).
그림 Fig. 9. Mixing degree depending on diameter and velocity of injection in the 2,000 mm pipe.((a) : 10 mm injection pipe, (b) : 20 mm, (c) : 30 mm, (d) : 40 mm).
그림 Fig. 10. Comparison of mixing degree at the same flow amount(10mm_20 m/s and 20 mm_5 m/s).
그림 Fig. 11. Comparison of mixing degree at the same flow amount(20 mm_20 m/s and 40 mm_5 m/s).
그림 Fig. 12. Mixing degree depending on Kinetic energy(Pipe diameter, (a) 500 mm, (b) 1000 mm, (c) 2000 mm).
표 Table 4. Required kinetic energy at 10D and 20D for each pipe diameter (Unit: kJ)

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