頁籤選單縮合
題名 | 中鋼3號高爐噴煤技術之革新與效益=Renovation and Benefit of Pulverized Coal Injection Technology for No.3 Blast Furnace at CSC |
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作者姓名(中文) | 葉志明; 何忠根; 杜憲文; 許中輝; | 書刊名 | 鑛冶 |
卷期 | 45:4=176 2001.12[民90.12] |
頁次 | 頁57-68 |
分類號 | 454.89 |
關鍵詞 | 粉煤噴吹; 鼓風管; 鼓風嘴; 礦石; 焦炭; Pulverized coal injection; Blow pipe; Tuyere; Lump ore; Coke; |
語文 | 中文(Chinese) |
中文摘要 | 為了降低高爐燃料成本,間接地也為了減少煉焦爐稼動率,提高焦炭品質和延長煉焦爐壽命。高爐操作均傾向提高粉煤噴吹率和降低焦炭率。本公司3號高爐於1993年11月粉煤噴吹設備建廠完成開始噴煤,即面臨噴煤鎗堵塞、噴煤鎗堵塞、噴煤鎗蝕損、鼓風嘴蝕損頻率高,透氣阻力高等問題,使得噴煤率無法進一步提升至130公斤╱噸鐵水以上。 基於此,乃從改善粉煤輸送穩定性及提升粉煤燃燒效率兩方面進行研究。經由噴煤鎗內溫度量測及噴煤鎗表面溫度計算得知噴煤鎗堵塞和蝕損乃噴煤鎗內表面溫度過高所致,若採用氣冷式噴煤鎗將可有效降低噴煤鎗內表面溫度;另經由粉煤燃燒實驗評估及模擬計算證實雙噴煤鎗粉煤燃燒效率優於單噴煤鎗;乃決定在3號高爐進行設計及開發氣冷式雙噴煤鎗,並已獲完滿之成功。 而後再經由適當的佈料調整、理論火焰溫度調整及減少爐渣率等運作,送得以在維持高鐵水產量的條件下,而使得噴煤率突破瓶頸達160公斤╱噸鐵水。此項技術革新之效益:使得鐵水生產的燃料成本得以進一步降低,每年節省約1.31億元以上。而且也減少了每噸鐵水耗用碳17公斤,亦即減少了二氧化碳之排放,有助於全臺灣減輕溫室效應。 |
英文摘要 | For the purpose of reducing blast furnace (BF) operation cost and coke oven production rate, improving coke quality and extending coke oven life, if tends to use higher Pulverized Coal Injection (PCI) rate and lower coke ratio in BF operation nowadays. Since the installation of PCI equipment at No. 3 BF of China Steel Corporation (CSC) in November 1993, difficulties were encountered including lance clogging and erosion, tuyere failures, and poor permeability in furnace, which prevented the increase of PCI rate to more than 130 kg/thm. This paper presents the improvements in transporting PC and the promotion of PC combustion efficiency. Based on the temperature measurement inside the lance and the temperature calculation on surface of lance, it was found that lance clogging and erosion were incurred from high temperature on inner surface of lance. It was effective to use an air-cooled coaxial lance to prevent lance from clogging and erosion. One the other hand, from the results of experiments and simulations on PC compustion, it was found that the combustion efficiency of double lance was better than that of single lance. Therefore, decision was made to design a system of coal injection using a double air-cooled coaxial lance which was later established at No. 3 BF. This proves a total success. Owing to improvements in operation such as using proper burden distribution, adjustment of theoretical flame temperature and reduction of slag ratio, the PCI rate has been increased from 130 to 160 kg/thm while the productivity of BF increased. The benefit of this renovation project came from a further reduction of the fuel cost and the total savings were over 131 million NT dollars per year. Besides, the greenhouse effect is alleviated with reduction of total carbon dioxide enission due to decreased consumption of reducing carbon 17 kilogram per ton of hot metal. |
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