Study On Heat Transfer Of Evaporated Cooling System For Walking Beam Furnace

Evaporated cooling system is widely used by many large steel mills because of itshigh efficiency and energy saving. In this paper, evaporated cooling system forwalking beam furnace in a hot strip mill was the research object. Based on heattransfer theory, fluid dynamics and other related theories, the flow field flow and heattransfer, and conjugate heat transfer in the process of cooling fluid for walking beamwere simulated by using numerical simulation method and professional analysissoftware. Fluid motion process and temperature distribution regularity of walkingbeam were obtained and carefully analyzed in order to provide useful reference andtheoretical guidance for the maintenance of evaporated cooling system ofwalking-beam. Detail work done in this paper was as follows:(1) By analyzing evaporated cooling system’ working principle and main devices,heat transfer analysis was carried out on the walking beam and cooling medium,thermal parameters of the main cooling parts of evaporated cooling system werecalculated.(2) According to the structure of the walking beam, fluid simulation model wasset up and mapped meshing was carried out by using ICEM. To use FLUENT to makesimulation analysis for a single flow field in walking beam under even heat flux. Toanalyze fluid motion and fluid temperature distribution of walking beam on the basisof simulation result.(3) To discuss conjugate heat transfer problems in the process of cooling fluid incases that the pipe has no scale and has an even scale layer, at the condition that theaverage temperature of heating furnace is1300°C Refractory, cooling pipe and coolingmedium, scale built a3d coupling model. By using one-way direct coupling analysismethod and CFX software, fluid flow heat transfer and coupling heat transfer of pipe were simulated. The results showed that scale had an evident effect on pipetemperature. Because of small heat conductivity, temperature difference betweeninside scale and outside scale increased along with scale thickness increased, and pipetemperature increased too. When scale reached a certain thickness, pipe temperaturewould exceed the limit, causing damage to the furnace pipe.