전산유체역학(CFD)를 활용한 정수공정에서 압력수 확산공정 진단 = Evaluation of Pressurized Water Diffusion in Water Treatment Process Using CFD

국문 초록 (Abstract)

압력수 확산공정은 정수공정에서 응집제나 염소용해수를 고압의 압력수로 분사하여 혼합하는 공정이다. 본 연구의 목적은 압력수 확산공정에 대한 전산유체역학적(Computational Fluid Dynamics) 진단을 통해 투입한 약품의 완전 혼합거리 및 혼합 거리를 줄이기 위한 확산판의 크기와 설치거리를 도출하는 것이다. 진단결과 2,200 mm 대형관에 5 kg/cm2 압력수를 50 mm, 100 mm 분사관으로 분사할 경우 혼합이 완료되는 혼합거리는 4D였다. 혼합거리를 줄이기 위해 분사관 전방에 확산판을 설치할 경우 분사관이 50 mm일 때 0.1D 직경의 확산판을 분사관 전방 0.2D 거리에 설치하면 혼합거리를 3D로 줄일 수 있다. 그러나 분사관이 100 mm인 경우는 확산판의 크기와 설치 거리와는 상관없이 확산판이 없는 4D보다 확산거리를 줄일 수 없는 것으로 진단되었다. 따라서 2,200 mm 관에 압력수를 분사하는 경우는 50 mm 분사관을 설치하는 것이 100 mm보다 휠씬 효율적인 것으로 나타났다.

다국어 초록 (Multilingual Abstract)

The Process of Pressurized water diffusion is mixing process by pressurized water injection with coagulate and chlorine water in the water treatment system. The objectives of this research were to evaluate the mixing length and diameter of diffusion plate and distance from injection pipe for complete mixing by using computational fluid dynamics. From the results of CFD simulation, when diameter of injection pipe is 50 mm, 100 mm and injection pressure is 5 kg/cm2 and the diameter of inlet pipe is 2,200 mm, the complete mixing length is 4D (D: Length as diameter of inlet pipe). When diameter of injection pipe is 50 mm, the diameter of the diffusion plate in o.1D and distance from injection pipe is 0.2D, the complete mixing length is 3D that is the most short mixing length. But when diameter of injection pipe is 100 mm and mutually related the diameter, distance of diffusion plate, the complete mixing length is 4D over. Therefore, as the diameter of inlet pipe is 2,200 mm, the injection pipe 50 mm is more efficient than 100 mm.

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