To clarify the mechanism of flow and heat transfer of cooling water in a dual-chamber tuyere of blast furnace,a multi physical field coupling model for hot air,copper body of tuyere,cooling water in front and back chambers was established,and the influence of production parameters on difference in water temperature and the highest temperature of copper body was analyzed in detail.The calculation results showed that every increase of 2 m3/h in the flow rate of water in front chamber caused the copper body to decrease in the maximum temperature by 1.45 ℃;every increase of 2 m3/h in the flow rate of water in back chamber caused the copper body to decrease in the maximum temperature by 0.75 ℃;every increase of 100 ℃ in the theoretical combustion temperature caused the copper body to increase in the maximum temperature by 44.51 ℃;every increase of 100 ℃ in gas temperature around the side wall of the tuyere caused the copper body to increase in the highest temperature by 0.21 ℃.The industrial test results showed that when the flow rate of water in front chamber increased from 30 to 38 m3/h,the actual service life of the tuyere did not be significantly increased,which was consistent with the theoretical calculation results.Therefore,in the actual production,it is recommended to increase the lifespan of the tuyere from two aspects:firstly,real-time monitoring of the theoretical combustion temperature of the tuyere and early warning of the high heat flux intensity should be carried out;the second is to optimize the tuyere structure or add coatings to reduce the maximum working temperature of the copper body.
维普
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