Simulation Analysis And Optimal Design Of The Vertical Layered Cooling Process For High Temperature Sinter

In the process of ironmaking,the lean ores need to be sintered at high temperatures,crushed,cooled,and other links before blast-furnace smelting.As one of the important links,the cooling processes with great performances is significant for the cooling effect of high-temperature sinter.The mainstreaming cooler for high-temperature sinter includes the circular-type cooler and the vertical-type cooler.The circular-type cooler adopts the cross-flow heat transfer form and the type has a high air leakage rate and low heat transfer efficienc y.The traditional vertical-type cooler adopts the countercurrent cooling form.Although the heat transfer efficiency is improved,the high material layer increases the possibility of air flue blockage of the sintering equipment and leads to a poor cooling effect for high-temperature sinter.Based on the problem mentioned above,the relevant works are completed under the help of simulation tools:(1)A vertical layered cooling process for high-temperature sinter is proposed.Adopting the countercurrent cooling form,the process has high heat transfer efficiency.Besides,the process designs a layered construct for material,which solve s the problem of the air flue blockage due to the high material layer.(2)Study the influence of operating parameters of th e vertical layered cooling process on the gas-solid heat transfer process.The paper proposes a gas-solid heat transfer model of the vertical layered cooling process of the high-temperature sinter,and verify the model by experiment.Based on the reliable numerical simulation model,the paper takes porosity,particle diameter,inlet gas velocity and temperature,and the cooling time as the main operating parameters.Besides,the influence law of the above operating parameters on the gas-solid heat transfer process in the cooling process is obtained by numerical analysis.(3)Implement multi-objective optimization on the gas-solid transfer process of the vertical layered cooling process.In this paper,t he average temperature of the cooled high-temperature sinter and the recycling amount of heat waster during the cooling process are taken as target parameters.The particle diameter,inlet gas velocity,inlet gas temperature,and cooling time are taken as operating parameters.Based on the vertical layered cooling process,the multi-objective optimization is implemented on the gas-solid heat transfer process and a set of optimal parameter combinations are obtained.(4)Study the influence of the layering schemes of different particle diameters on the cooling uniformity of high-temperature sinter.In the verticle layered cooling process,due to the large temperature differences existing in the single layer of the cooled high-temperature sinter,the particle layering is implemented in single-layer sinter.Besides,a layering scheme with a group of optimal particle diameters is obtained by studying the influence of different particle diameters on the cooling uniformity of high-temperature sinter.Based on the scheme,a set of vertical layered cooling equipment program for high-temperature sinter is designed.