Effect of harmful elements on the coke ratio of blast furnace based on the Rist operating diagram
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摘要:
分析了有害元素在高爐內的循環行為,結合高爐實際生產參數,運用里斯特操作線進行計算,揭示了有害元素對焦比的影響規律,建立了焦比與有害元素入爐負荷和循環富集倍數之間的定量關系.計算結果表明:有害元素在高爐內"還原-氧化-再還原"的循環過程會將高溫區的CO轉移到低溫區,降低煤氣利用率,同時消耗了高溫區大量熱量,從而使焦比升高.不同有害元素的影響程度不同.有害元素循環富集倍數對焦比影響的強弱順序為:Na > K > Zn,有害元素入爐負荷對焦比影響的強弱順序為:Zn > Na > K.進一步的分析表明,Na、Zn對高爐焦比的影響大于K.但考慮到K對焦炭劣化的作用更明顯,故要嚴格控制K、Na、Zn的入爐負荷.基于上述計算得到的定量關系,利用高爐不同有害元素入爐負荷以及焦比進行曲線擬合,預測高爐有害元素的循環富集倍數.曲線擬合結果與高爐解剖實驗結果相吻合.
Abstract:The adverse effects of harmful elements on blast furnace life and production have been adequately researched; however, studies of the effects on the energy consumption of blast furnace are few. In this study, the circulation and accumulation of harmful elements in a blast furnace were analyzed. By combining the actual production parameters of a blast furnace and the Rist operating diagram, the effect of the harmful elements on the coke ratio was revealed and the quantitative relationship between the coke ratio and the loads and accumulation times of harmful elements was established. The calculation results show that the harmful elements cycle of "reduction-oxidation-re-reduction" in the blast furnace can transfer the CO from the high-temperature zone to the low-temperature zone, and consume a lot of heat in the high-temperature zone. This can decrease gas utilization and increase heat consumption in the hightemperature zone, consequently increasing the coke ratio. Each harmful element affects the coke ratio differently. Considering their accumulation times and loads, the harmful elements affect the coke ratio in the following orders:Na > K > Zn and Zn > Na > K, respectively. Further analysis shows that the effect of Na and Zn on the coke ratio is greater than that of K. However, considering the effect of K on coke deterioration is more significant, it is necessary to strictly control the load of K, Na, and Zn. Based on the quantitative relationship obtained by the above calculation process, curve fitting is carried out using the loads of harmful elements and coke ratio of blast furnace to predict the harmful elements accumulation times in the blast furnace. The curve fitting results are consistent with the blast furnace dissection experiment results.
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Key words:
- blast furnace /
- harmful elements /
- circulation and accumulation /
- Rist operation diagram /
- coke ratio
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參考文獻
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