Abstract
The steel industry, in accordance with the momentum of greener industry, has welcomed the changes and is actively pursuing that objective. One such activity is the commitment to energy recovery from by-products such as slag since the average energy content of ferrous slags is around 1 to 2 GJ/tslag. The recovered energy could, then, be used in heating or drying process among others. The RecHeat was designed and modelled iteratively to achieve an optimised heat recovery apparatus. The model shows that the temperature of different sections of the heat exchanger part varies from 170 to 380 °C after slag pouring while the average air temperature at the entrance of the heat exchanger is less than 150 °C. Furthermore, the temperature of the fluid medium changes from 125–140 °C to 260–340 °C from one end of the heat exchanger part to the other at the end of the simulation. The outlet temperature at the end of the simulation is calculated to be around 340 °C, which shows an increase by at least 200 °C in the temperature of the air entering the apparatus.
Highlights
Production of iron and steel is a CO2 - and energy-intensive activity
The modelling of the RecHeat can be divided into two distinct parts: the structure heating and heat exchanging stages
The results of the simulation were used to redesign and optimise the structure to maximise the heat recovery process. This was done to prevent the economical exhaustion of the building and testing of such an apparatus
Summary
Production of iron and steel is a CO2 - and energy-intensive activity. The global steel industry is responsible for one-quarter of industrial CO2 emissions and 7 to 9% (2020) of global anthropogenic CO2 emissions. During 2019, 22% of globally used industrial energy was used in steel production. 10–20% of the total production costs of steel [1,2,3,4]. Improved energy efficiency is one of the approaches of greener steel production. This is generally seen as one of the major short-term methods of CO2 emission reduction in the steel industry
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