Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/4963
標題: 應用濕式靜電集塵器收集熱軋鋼廠排放煙塵之效率及費用評估
Efficiency and Cost Estimation of a Wet Electrostatic Precipitator Employed to Collect the Emitted Particulates from a Hot Strip Mill
作者: 許永霖
Hsu, Yung-Lin
關鍵字: Wet electrostatic precipitator
濕式靜電集塵器
Hot strip mill
Steel-making Business
Design parameters
熱軋鋼廠
鋼鐵業
設計參數
出版社: 環境工程學系所
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摘要: 鋼鐵產業依製程可區分為一貫作業煉鋼廠之煉鐵製程、煉鋼製程、軋鋼製程及電弧爐煉鋼技術。軋鋼製程屬中游部分之生產流程,鋼胚經軋延後生產各式下游產品如鋼板、冷熱軋鋼捲、條鋼等,在軋延過程中產生大量之氧化鐵粉污染物,經由濕式靜電集塵器(Wet ESP) 收集處理後可有效達到法定排放標準。而其具有收集效率高、可處理大風量、壓損小、高溫、高濃度廢氣、操作費用低以及可回收有價金屬粉塵等優點。因國內熱軋鋼廠設置濕式靜電集塵器的研究文獻報告案例極少,故本研究應用實際設計條件數據,計算重要參數來驗證理論收集板面積是否符合實際需求收集板面積,藉此驗證過程以了解濕式靜電集塵器之重要設計參數對於實際建造設備規模之影響程度。 為評估濕式靜電集塵器早期與近代之設置費用差異度,以1988 年時期ESP 製造費用按美國消費者物價指數( CPI )換算相當於2009 年製造費用,比較二時期製造費用,發現兩者差異不大僅差距649 NTD/m2(比例約4%)。因ESP 製造價格隨極板面積而定,建議可採用P=aAb公式計算濕式靜電集塵器製造價格,藉以評估提升效率時之製造費用參考。
Steel production processes can be divided into: iron-making in integrated steel mills, steel-making, rolling and steel making by arc furnace technology. Rolling is the midstream process of steel production. After rolling the slabs or billets, downstream products become steel plates, hot and cold rolled coils, bars and rods, etc. During the rolling process, a considerable amount of pollutants such as ferric oxide powder, can be collected by a wet ESP for subsequent treatment so as to meet the statutory emission standards. There are several advantages to use a wet ESP, including high collection efficiency, large treatment capacity, low pressure drop, applicable for waste gases with high temperatures and high concentrations, low operation cost, and able to recycle the valuable metal. Since there are quite few domestic research on setting up a wet ESP for hot strip mills, the purpose of this research is to apply the design data to calculate the crucial parameters so as to verify whether the theoretical estimation of the collection area meets the practical requirements. Through the process of verification, we can realize the degree of influence about the “crucial design parameters” to the implementation scale of wet ESP in practice. In order to evaluate the difference in expenses for setting up a wet ESP in early time from that in current time, the wet ESP manufacturing expenses in 1988 was converted into the equivalent cost in 2009 according to the CPI of the United States. We compared the expenses in these two years and found that the difference was insignificant, only 4% (NTD649/ m2). As the manufacturing price of ESP is subject to the size of its collecting electrode, we suggest to apply the formula of P=aAb to calculate the manufacturing price for wet ESP during the evaluation for efficiency upgrading.
URI: http://hdl.handle.net/11455/4963
其他識別: U0005-0308201120130300
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-0308201120130300
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