以數值模型研究尾氣循環系統之鐵礦燒結製程

Investigation of Iron Ore Sintering Process with Flue Gas Recycling System by Using Numerical Model

黃以松(Yi-Sung Huang) ； 許聖彥(Sheng-Yen Hsu)

《燃燒季刊》 106期 (2019/08) Pp. 28-44

https://doi.org/10.30041/CQ.201908_(106).0003

摘要

本研究成功建立三維全尺寸尾氣循環系統鐵礦燒結模型，搭配實驗量測參數，獲得之模擬結果與現場量測數據驗證，其模擬結果具有相當的參考價值。模擬結果顯示焦炭含量減少，風箱內CO及CO_2比例減少，相反的O_2比例上升；含水量減少，風箱內H_2O比例減少、燒結速度加快；增加流經燒結床10kg／s的尾氣流量，可提早燒結完成位置約半個風箱。此外，模擬風車總抽吸量約為實驗量測值的75％時，燒結在第17個風箱完成。其差異除了量測誤差外，現場燒結製程的封閉性也是造成的原因，尤其在台車移動軌道與風箱間的間隙。

關鍵字

燒結製程 ； 尾氣循環 ； 數值模型

並列摘要

In this study, a three dimensional full scale model for iron ore sintering process with flue gas recycling system is established. By using the experimental parameters, the simulation results show good agreement with the measured data in the work field, so the model results can provide considerable information. The simulation results show that the concentration of CO and CO_2 in flue gas decrease, but O_2 increases, with the reduction in coke, As the water content reduces, the concentration of H_2O decreases, but the sintering speed increases. As the mass flow rate of flue gas through the sintering bed is increased by 10 kg/s, the sintering process can finish earlier by 1/2 bellow distance. In addition, by using the mass flow rate, induced by the draught fan, about 75% of the measured value in simulation, the sintering process ends at the 17^(th) bellow, which is the same 1℃ation in the sintering process. In addition to the measurement errors, the cause of the difference may also be attributed to the airtightness of gas flow ducts, especially the gap between the moving sintering bed and bellows.

並列關鍵字

Sintering pr℃ess ； flue gas recycling ； Numerical model