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Integration of coal gasification and waste heat recovery from high temperature steel slags: an emerging strategy to emission reduction.

Abstract：

:With the continuous urbanization and industrialization in the world, energy saving and greenhouse gas (GHG) emission reduction have been serious issues to be addressed, for which heat recovery from traditional energy-intensive industries makes up a significant strategy. Here we report a novel approach to extract the waste heat and iron from high temperature steel slags (1450-1650 (o)C) produced in the steel industry, i.e., integration of coal gasification and steel slag treatment. Both the thermodynamics and kinetics of the pertinent reactions were identified. It was clarified that the kinetic mechanism for gasification varied from A2 model to A4 model (Avrami-Erofeev) in the presence of slags. Most importantly, the steel slags acted not only as good heat carriers but also as effective catalysts where the apparent activation energy for char gasification got remarkably reduced from 95.7 kJ/mol to 12.1 kJ/mol (A2 model). Furthermore, the FeO in the slags was found to be oxidized into Fe3O4, with an extra energy release, which offered a potential for magnetic separation. Moreover, based on the present research results, an emerging concept, composed of multiple industrial sectors, was proposed, which could serve as an important route to deal with the severe environmental problems in modern society.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Sun Y,Sridhar S,Liu L,Wang X,Zhang Z

doi

10.1038/srep16591

subject

Has Abstract

pub_date

2015-11-12 00:00:00

pages

16591

issn

2045-2322

pii

srep16591

journal_volume

5

pub_type

杂志文章

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