| Summary: | 碩士 === 國立中興大學 === 環境工程學系所 === 99 === 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.
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