Optimalization of Heat Transfer for Water Cooled Hot Gas Line In Dedusting System Slab Steel Plant

by "Dinaryuda Dwi Kurniawan, Mardono, Arief Budi Artha"

Publisher - PT Krakatau Steel (Persero) Tbk.

Category - Engineering & IT

"Dedusting Plant is one of the system that is a part of Slab Steel Plant. This Dedusting Plant aims to take up hot gas which is produced by Electric Arc Furnace (EAF) on Steel Making Process. Water Cooled Hot Gas Line is one of heat transfer part of this Dedusting Plant. Performance of Water Cooled Hot Gas Line can be indicated by the values of the temperature (T) fluid that flowing in and out.In this Water Cooled Hot Gas Line, The Temperature of water flowing out, exceed standart temperature. So this high temperature outlet make the system trip/off. So that need to evaluating heat transfer of water cooled hot gas line to remove delay process because of the high temperature outlet water cooled hot gas line. This optimalization aimed to evaluate the heat transfer performance of water flow in a water cooled duct in section 1 and 2 EAF 6. This sections consisted of three parts, namely inlet header, pipe line, and outlet header. The inlet header has a diameter nominal pipe 125, the pipe line has a diameter pipe 76.1 mm, and the outlet header has a diameter nominal pipe 125. The water entry to inlet header which is has 3 branch in that is come to pipe channel, then from pipe channel the water exit to the 3 branch out of oulet header. In this optimalization used the theory heat transfer equation to calculate the performance of heat transfer and use 3D drawing software to design a new modification on water cooled duct. The results of the calculation of heat transfer showed that the water cooling system need to be improve because the design of header and branch are not optimum. Then, based on the heat transfer calculation, modification can be made for the inlet and outlet header and for the branch of pipe line. The inlet header and outlet header is changed from nominal diameter pipe 125 to 150. The Branch of pipe line is changed from 3 Branch which have length of cooling pipe 233.577 meter each part to 6 Branch which are have length of cooling pipe 109.448 meter each part. So the water that flow to the pipe channel now have a shorter circuit than the existing.. Optimalization of the Header and the pipe branch show a better heat transfer for the water cooled hot gas line system on dedusting plant."

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