高爐離散元素法加料模式的建立與應用

中鋼高爐加料系統為無鐘型加料系統，即將焦炭和礦石依序交互加入爐內，並藉由改變旋轉佈料槽的角度和圈數，以控制爐內礦焦比分佈，進而控制氣流分佈和爐壁熱負荷。料層分佈是影響高爐產率、燃料率、爐代壽命等最關鍵的因素。為了解高爐加料過程，乃使用離散元素法模擬原料從爐頂料倉，經佈料槽到爐內的料流軌跡及焦炭和礦石分別抵達料面的堆積過程。經比較得知離散元素法模擬的料流軌跡與雷射網格法測量的結果相當。又依據填充調查雷射測距法測量的料面形狀，選定縮小尺寸的粒子參數，而後可以進行模擬比較不同高爐加料條件下的礦焦比分佈，以作為調整佈角的依據。此外，也模擬2號高爐有、無中心加焦及不同礦焦比對礦焦比分佈的影響，協助中心加焦成功，並提高產率及降低焦炭率。

關鍵字

離散元素法；無鐘型加料系統；佈料槽；中心加焦

並列摘要

The bell-less charging systems are installed at blast furnaces (BF) of China Steel Corporation. The ore and coke are alternatively charged into BF via rotating chute's of varying angle and rotation rate to control O/C distribution, gas flow distribution and heat load. Burden distribution is the one of key factors affecting BF productivity, fuel rate and campaign life. To model the charging process, a discrete element method (DEM) was used. The model simulated the falling trajectory from bunker, chute to furnace and accumulating process after ore and coke arriving at burden surface. Compared with laser meter and laser frame measurement methods, the simulated falling trajectory by DEM is acceptable. To reduce the computing time, a scale-down simulation of O/C distribution is necessary. The particle parameters with scale-down were determined based on the measured burden surface with laser meter during filling investigation. It is helpful to operators as a reference to adjust the chute angles. The simulation technique was used at No.2 BF to assess the effect of O/C distribution with/without center coke charging and different O/C. It has faciliated a successful center coke charging, reduced the coke rate, and increased the productivity.

並列關鍵字

Discrete element method ； Bell-less charging system ； Chute ； Center coke charging

國際替代計量

高爐離散元素法加料模式的建立與應用

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