Abstract
In recent years, there has been an increasing interest in the recovery of the waste heat of steel and glass processes. This work proposes a numerical study of a waste heat exchanger system for steel production processes. The radiative energy is transferred to a commercial oil, which can be used to produce electricity. The behavior of the recuperator is analysed using a 3D numerical model, considering the constrains of a real production plant. The influence of the radiation properties of the materials on the temperature and heat transfer rate are also examined. The results show that the absorptivity of the tubes influences significantly the absorbed waste heat. Furthermore, heterogeneous mass flow distribution should be applied to optimize the total heat transfer rate.
Highlights
As a result of the changes of environmental policies, such as H2020 in Europe, there has been an increasing interest in waste heat recovery in recent years
This work proposes a numerical study of a waste heat exchanger system for steel production processes
The results show that the absorptivity of the tubes influences significantly the absorbed waste heat
Summary
As a result of the changes of environmental policies, such as H2020 in Europe, there has been an increasing interest in waste heat recovery in recent years. Villar et al [6] examined the state of art of waste heat recovery technologies of 5 representative sectors in continuous industrial processes They presented a case study made in the steel sector, achieving emissions reductions greater than 85. Liu et al [7] developed a gravity bed waste heat boiler to recover the heat of high-temperature slag particles They analysed the influence of different design parameters on the efficiency of the boiler, such as Reynolds number and particle dimensions, getting efficiencies greater than 90%. Conduction, using molten salts to recover it They studied the influence of design parameters on the performance of the recuperator using CFD numerical models. The total heat transfer and the oil temperature jump inside the tubes for the proposed design are analysed
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