Design of a Radiant Heat Capturing Device for Steel Mills

Abstract

This paper approaches the energy transition towards decarbonization and lower primary energy use in the steel and glass industries through the exploitation of radiant waste heat. In contrast with exhaust gases heat recovery, radiant waste heat has typically not been used. This energy waste is found in energy intensive processes in which high temperatures are reached. For instance, in the steel making process, the cast steel is red hot and emits a considerable amount of radiant energy. In this paper the conceptual design of a radiant heat capturing device is presented. This device enables the recovery of currently unused energy while solving the radiative emission-related problems. The achieved design gets to an optimized solution regarding view factors and optical properties of the involved surfaces. In this research work, those factors are optimized to maximize the amount of heat recovered by the presented device. Simulation tools are used to test different designs and define the most appropriate solution for a given case.

Innovative Hybrid Condensing Radiant System for Industrial Heating: An Energy and Economic Analysis

“…As an energy-intensive industry, some authors approached the use and saving of energy in the glass and steel sectors through the use of radiant waste heat [9]. They presented the conceptual design of a radiant heat capture device, optimising the view factors and optical properties of the surfaces involved to maximise the amount of heat recovered.…”

Reduction of CO2 Emissions in Steelmaking by Means of Utilization of Steel Plant Waste Heat to Stabilize Seasonal Cooling Water Temperature

“…Almost all high temperature facilities, such as the blast furnace, basic oxygen furnace, CC process, hot rolling, etc., involved in the steel industry have a potential for waste thermal energy recovery. Pérez et al [6] proposed a solution to radiative heat recovery by using a special reflector located directly in the CC machine. Keplinger et al [7] investigated the use of a heat recovery system which uses the electric arc furnace waste for steam production.…”

“…In the case that the temperature of inlet water is only 10 • C and the estimation of energy loss during the energy conversation is 25%, the rate of heat flow according to Equation (2) is 1406.4 kW. In the case of the special heat capture reflector proposed by Pérez et al [6], the Tunnel Shaped reflector can capture 32,700 Wm −2 (assuming the reflector temperature is 500 • C) of radiative heat from the slab. The examined slab dimensions were set to 1.50 m × 0.25 m, which means that Tunnel Shaped reflectors must cover the slab in the longitudinal direction at least in 43 m. Due to the size of the steelmaking plant, this distance can be acceptable for most of the CC machines.…”

Implementation of the spectral line‐based weighted‐sum‐of‐gray‐gases model in the finite volume method for radiation modeling in internal combustion engines

“…It is well‐known that radiative heat transfer is intensified at the high operating temperatures present in combustion systems 1 . A dominant share of total heat transfer is accomplished by radiation for systems that feature larger sizes, such as boilers, furnaces, and jet engines 2 . According to recent publications, the impact of radiation heat transport on pollutant formations needs to be considered if the correct calculation of emissions is demanded 3 .…”

“…1 A dominant share of total heat transfer is accomplished by radiation for systems that feature larger sizes, such as boilers, furnaces, and jet engines. 2 According to recent publications, the impact of radiation heat transport on pollutant formations needs to be considered if the correct calculation of emissions is demanded. 3 Most pollutant formation models are affected by temperature distribution, which arises from the heat transfer calculation.…”