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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
REHEATING FURNACES IN THE STEEL INDUSTRY: UTILIZATION OF COMBUSTION GASES FOR LOAD PREHEATING AND COMBUSTION AIR PREHEATING USING COG, LDG AND BFG AS PROCESS GASES
Submission Author:
Diego Jhovanny Mariños Rosado , SP
Co-Authors:
Diego Jhovanny Mariños Rosado, Samir Boset Rojas Chávez, Jordan Gutierrez, João Carvalho, Miguel Huaraz Rodriguez, Andrés Armando Mendiburu Zevallos
Presenter: Diego Jhovanny Mariños Rosado
doi://10.26678/ABCM.ENCIT2020.CIT20-0017
Abstract
In the steel industry, reheating furnaces are the main energy consumers and it is estimated that furnaces use 67% of the total energy. The reheating furnace of the steel industry was studied, which uses the gas mixture from coke oven (COG), steelmaking process “Linz-Donawitz” (LDG) and blast furnace (BFG); with the production of steel laminates being its main activity. In this work to deal with energy consumption, a methodology was developed to recover the heat from the combustion gases and its use in load preheating and combustion air preheating. This evaluation was intended to obtain an economy in fuel consumption, and to improve technical energy indicators of production and heat generation, as well as to improve the efficiency of the furnace and the combustion process. When developing the present study in the reheating furnace it was evidenced an economy in the fuel consumption of the COG/LDG mixture of 6606 m3/h and 4627 m3/h for the load preheating and the air preheating, respectively. In addition, efficiency of the furnace was increased by 23.3% and 15.2%, with the technical energy indicators improved by 18.9% and 13.2% in each case. For the COG/BFG mixture, the results obtained were similar.
Keywords
Combustion air preheating, heat recovery, Load preheating, reheating furnace, steel industry
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