Numerical Simulation Of Blast Furnace Tuyere Structure Optimization Based On ANSYS Workbench

Severe REDOX reaction happening inside blast furnace,tuyere surface sufferting large heat flux, tuyere air supply channel surface under the convection of high temperature air and the erosion of high-speed pulverized coal, in order to guarantee the normal production of blast furnace operation, water must be passed into tuyere for compulsory cooling. Considering the complexity of water flowing, heat transfer and thermal strain inside the tuyere ontology, this paper which started from the control equation of fluid mechanics, heat conduction differential equation and thermal elastic theory, simulated and analyzed the internal cooling water flow field, temperature field and thermal strain field of the tuyere based on ANSYS Workbench. The entity model of tuyere was built by the software UG NX, and of the blast furnace tuyere structure is optimized through the numerical value.The research shows the results as follows:(1) The tuyere structure and material properties of ontology have reached the design requirements before optimization, tuyere on the front-end prone to become warped and cracking, is consistent with the actual situation. After analysis, the cooling water flow for 8L/min, and the temperatures of around 313 K are quite reasonable.(2) Compared to the original plan, the maximum speed is dropped by 1.31m/s after in and out of the gate structure's optimization. But the average speed is increased by 0.1m/s; The maximum temperature is increased by 4.94 K, and tuyere overall cooling effect is improved; The maximum stress in front upper distribution area of tuyere is bigger than the original scheme's, the biggest stress value decreased to 22.53MPa(about 11.34%), and the solution to reduce the thermal stress of tuyere suffered effect is more obvious.(3) After optimizing the channel size, the performance of the tuyere 35-50-65 is the best. I cavity cooling water compared to the original scheme improves the average speed 0.7m/s; Compared with the original plan, the maximum temperature distribution without big changes, the lowest temperature area decreases obviously,and temperature also has significant reductionl in the front of other high temperature area; Maximum stress distribution area increases in the upper tuyere front-end on theexport of pulverized coal injection, the maximum stress is 152.4MPa(by 23.3%).(4) After optimizing structure by imbedding wear-resisting lining, the highest temperature of tuyere 1 rised, but it was just the opposite in tuyere2; The maximum stress value of them is lower than the promised values, the coating is not prone to cracking and peel off from the tuyere ontology, which avoids direct contact with the pulverized coal and tuyere ontology, and can effectively reduce the tuyere front-end appear wear away the chance of failure. Comparing two kinds of tuyere, gradient coating makes tuyere 1 smaller stress, and service life longer under the high temperature environment.