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Appl. Sci. 2019, 9(8), 1576; https://doi.org/10.3390/app9081576

Partition of Cu and Pb in a Two-Stage Fluidized-Bed Waste Gasification System

1
Department of Civil and Environmental Engineering, National University of Kaohsiung, Kaohsiung 811, Taiwan
2
Environmental Protection Bureau, Kaohsiung City Government, Kaohsiung 833, Taiwan
*
Author to whom correspondence should be addressed.
Received: 22 February 2019 / Revised: 11 April 2019 / Accepted: 12 April 2019 / Published: 16 April 2019
(This article belongs to the Special Issue Techniques for Sustainable Processing of Natural Resources)
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Abstract

In this study, a two-stage fluidized-bed gasification system was used to determine the distribution of heavy metal contaminants in simulative waste and evaluate the effect of the bed operating temperature, Equivalence ratio (ER), and Steam/Biomass ratio (S/B) in stage 1. The heavy metal concentrations in bed materials and fly ash were measured in two stages. The results show that as the operating temperature of stage 1 increased, the quantity of heavy metals entrapped by stage 1 bed material decreased, while that captured by stage 2 bed material increased. The less volatile Cu was mostly entrapped in stage 1 bed material. The ER and S/B results show that increasing the ER and S/B caused a slight increase in the concentrations of heavy metals entrapped in stage 1 and stage 2 bed materials. However, the influences of ER and S/B were less than that of temperature. The major factors affecting the heavy metal distribution were the operating temperature and the heavy metal volatility. Stage 2 bed material was able to entrap gaseous heavy metals or particles containing heavy metals by particle filtration and chemical adsorption. Thus, the heavy metals (Cu and Pb) had a downward trend after passing through stage 2. View Full-Text
Keywords: two-stage gasifier; heavy metal; waste; syngas; pollutant two-stage gasifier; heavy metal; waste; syngas; pollutant
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Lin, C.-L.; Chou, J.-D.; Weng, W.-C. Partition of Cu and Pb in a Two-Stage Fluidized-Bed Waste Gasification System. Appl. Sci. 2019, 9, 1576.

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