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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
REHEATING FURNACES IN THE STEEL INDUSTRY: DETERMINATION OF THE THERMAL POWERS IN THE COMBUSTION OF COKE OVEN GAS, LINZ-DONAWITZ GAS AND BLAST FURNACE GAS
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.CIT20-0016
Abstract
The reheating furnace of the steel industry was evaluated in the present study, which uses the gas mixture from coke oven (COG), steelmaking process “Linz-Donawitz” (LDG) and blast furnace (BFG). The purpose of this article was to estimate the thermal powers at each stage of the reheating furnace process. Each case was analyzed for mixtures of COG/LDG and COG/BFG; obtaining the quantities of the following thermal powers: Heat supplied by the fuel, heat loss by heat transfer, heat absorbed by steel, heat of the combustion gases, heat for air preheating and other heat losses. The thermal powers obtained was presented in a Sankey diagram. In addition, to reduce losses by heat transfer in the furnace below 2% in each case. An analysis of insulation was carried out on the roof, walls and floor, taking into account the types of materials and thickness in each layer. It is evident that for the COG/LDG mixture, 46.7% of the heat transferred to the steel was obtained, and among the losses, 13.3% was obtained from the combustion gases, 1.6% from the heat transfer and 31.6% from other losses in the furnace, being a total of 46.5%. For the COG/BFG, the results obtained were similar.
Keywords
Energy consumption, heat loss, Thermal powers, Reheating furnaces, steel industry
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