期刊
ENERGY
卷 113, 期 -, 页码 845-851出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2016.07.130
关键词
Sludge; Pyrolysis; Waste heat; Molten BF slag; Hydrogen-rich gas
资金
- National Natural Science Foundation of China [21406127]
- open fund of Key Laboratory for Solid Waste Management and Environment Safety [SWMES 2015-04]
- China Postdoctoral Science Foundation [2015M580577]
Blast furnace (BF) slag, a byproduct of steelmaking industry, contains a large amount of sensible heat and is composed of some metal oxides, which exhibits preferable catalytic performance in improving tar cracking and CnHm reforming. This paper presents a heat recovery system from the heat of BF slag, which generates hydrogen-rich gas via the endothermic reactions of sludge pyrolysis. The effects of various parameters including the slag temperature, the mass ratio of slag to sludge (B/S), particle size and feed moisture on product yields and gas characteristics were evaluated separately. It was found that the pyrolysis products distribution was significantly influenced by the BF slag temperature. The differences resulting from varying B/S practically disappear as higher temperature heat carrier is approached. The optimum feed moisture was in favour of sludge pyrolysis by getting char and tar participate in gasification reactions, improving gas yield and quality. BF slag as catalyst can greatly increase H-2 and CO contents of gas by improving tar degradation and reforming of biogas (CO2 and CH4). Decreasing the slag particles size was helpful to sludge primary pyrolysis to produce more light gases, less char and condensate, while its effects on gas compositions was not evident. (C) 2016 Elsevier Ltd. All rights reserved.
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