Heat Recovery from High Temperature Slags: A Review of Chemical Methods

Yongqi Sun, Zuotai Zhang, Lili Liu and Xidong Wang
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Yongqi Sun: Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, China
Zuotai Zhang: Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, China
Lili Liu: Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, China
Xidong Wang: Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, China

Energies, 2015, vol. 8, issue 3, 1-19

Abstract: Waste heat recovery from high temperature slags represents the latest potential way to remarkably reduce the energy consumption and CO 2 emissions of the steel industry. The molten slags, in the temperature range of 1723–1923 K, carry large amounts of high quality energy. However, the heat recovery from slags faces several fundamental challenges, including their low thermal conductivity, inside crystallization, and discontinuous availability. During past decades, various chemical methods have been exploited and performed including methane reforming, coal and biomass gasification, and direct compositional modification and utilization of slags. These methods effectively meet the challenges mentioned before and help integrate the steel industry with other industrial sectors. During the heat recovery using chemical methods, slags can act as not only heat carriers but also as catalysts and reactants, which expands the field of utilization of slags. Fuel gas production using the waste heat accounts for the main R&D trend, through which the thermal heat in the slag could be transformed into high quality chemical energy in the fuel gas. Moreover, these chemical methods should be extended to an industrial scale to realize their commercial application, which is the only way by which the substantial energy in the slags could be extracted, i.e. , amounting to 16 million tons of standard coal in China.

Keywords: high temperature slag; waste heat recovery; chemical methods; fuel gas production (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (14)

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