Research On The Cooling Performance The Structure Of Inner Porous Cross-tube Of The Sinter-Circle-Cooling Machine Trolley

The sinter-circle-cooling machine has essential role of sinter cooling in steel industry, and after decades of development and research, the manufacturing technique of the sinter-circle-cooling machine become more and more maturity. By reason of the single cooling process of the sinter-circle-cooling machine’ trolley at present, the sinter is layer-by-layer cooling, and at the sinter top of the tpr taper area is difficult to cooling, cause a bed cooling effect and a long cooling period of the sinter. Therefore, a improve structure of the sinter-circle-cooling machine’ trolley was researched in this paper, in order to improve the cooling effect and the recover of waste heat,shorten the cooling period of the sinter, the research program has importance significance for the steel industry and energy saving.The structure of inner porous cross-tube trolley of sinter-circle-cooling machine was researched, on the basic of the traditional structure trolley, the inner porous cross-tube was set up at the central area of sinter, and the structure parameters of the inner porous cross-tube trolley was optimization researched, such as the velocity inlet, the height range the porous cross-tube from the grid plate, the distance of the porous cross-tube and the external diameter of the porous cross-tube, the optimization parameters which influence the cooling effect and the recover of waste heat were obtained.The main content and the research results in this paper as follow:1) According to requirement of improve the cooling effect and shorten the cooling period of the sinter, an inner porous cross-tube trolley was researched, the three inner porous cross-tubes were set up at the central area of trolley, two of them were located in the both sides which symmetrical about the trolley’ center line in width, the another was located in the trolley’ center line, the center porous cross-tube was higher than the both sides porous cross-tube.2) The physical model of the structure of inner porous cross-tube trolley was established, the heat transfer principle was used to analyzed the theoretical basis of the heat transfer process between sinter and cooling air, and the three dimensional physical model was simplified to the two dimensional physical model, the software Fluent was used to numerical simulate the computing area of the two dimensional physical model, the sinter cooling process that were influence by the inner porous cross-tube trolley and the traditional structure trolley were respectively researched, the conclusion of research as follow: the temperature field, the velocity field and the pressure field of the sinter area were changed; and compare with the traditional structure trolley, the inner porous cross-tube structure trolley is improve the cooling effect and shorten the cooling period of the sinter; on the stage of the recover of waste heat that the cooling time of the inner cross-tube structure trolley than the traditional structure trolley is reduce about 50%, on the end of cooling stage, the cooling time is reduce about 44%.3) The five structure parameters such as the velocity inlet of the cooling air, the height1 h range the both sides porous cross-tube from the grid plate, the height2 h range the central porous cross-tube from the grid plate, the distance l of the both sides porous cross-tube and the external diameter D of the porous cross-tube were optimization researched by the orthogonal test design method, the result of the orthogonal test design method show that: the primary and secondary sequence of the affect of the cooling effect and the recover of waste heat is D> l >1h >2h >v, the optimization combination parameters of the three inner porous cross-tube were obtained, that is the optimization parameters of the affect of the cooling effect and the recover of waste heat is mmh 3851(28), mmh 6402(28),(28)mml 790, D=273 mm and v=1.10 m/s.