A numerical study on the cooling water system （冷却水系统的数值研究）.pdf

Advances in Fluid Mechanics X 431 A numerical study on the cooling water system of an accelerated cooling machine S. Oh, S. Yoon P. Lee POSCO Research Laboratories, POSCO, South Korea Abstract Recently, in metallurgy processes, cooling water control is important for controlling the mechanical properties of material. Water cooling is one of the best techniques for a hot steel plate manufacturing process because it can use a high cooling performance of boiling. In this work we conducted a numerical study about water flow control with a cooling water control machine for steel plate making. We calculated the pipe network of the cooling water supply machine with two types of (previous and new type) cooling headers using FLOWMASTER. With a cooling header replacement, such as a cooling header change and the area of cooling nozzles, we achieved the increment of cooling water capacity and cooling performance. Keywords: steel plate making, accelerated cooling machine, cooling water control. 1 Introduction Steel plates are used in the making of oil and gas pipe, in the shipbuilding and pressure vessels, etc. Recently, the demand of high quality steel plates is rapidly increased due to growth of offshore plants. To make high quality steel plates, the cooling water control is important. Metallurgy processes use various heat- treatment techniques for controlling the mechanical properties of material. Water cooling is one of the best techniques for a hot steel plate manufacturing process because it can use a high cooling performance of boiling [1]. The water cooling method is classified into spray cooling and nozzle (or slit) cooling. When compared with