4.5 Article

Study on the limestone sulfation behavior under oxy-fuel circulating fluidized bed combustion condition

期刊

JOURNAL OF THE ENERGY INSTITUTE
卷 91, 期 3, 页码 358-368

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.joei.2017.02.005

关键词

Oxy-fuel; Circulation fluidized bed; Sulfation behavior; Product layers

资金

  1. Chinese Academy of Sciences [XDA07030200]
  2. International Science & Technology Cooperation Program of China [2014DFG61680]

向作者/读者索取更多资源

In order to investigate the behavior of limestone sulfation under oxy-fuel circulating fluidized bed (CFB) combustion condition, experiments were conducted in a 50 kW oxy-fuel CFB system under the O-2/CO2 and air combustion conditions. A small cage, containing limestone particles, was dipped into the dense zone of the CFB combustor during the experiments. The calcination of limestone, pore structure of the product layer, and calcium conversion were studied. It was found that the increasing of temperature would promote the calcination of limestone and the high concentration of CO2 would inhibit calcination of limestone. The formation process of the product layer was completely different between the direct and indirect sulfation, while it was almost the same during the indirect sulfation under the oxy-fuel and air combustion. However, both the temperature and gas compositions played important roles in determining the pore structures of the product layer during the limestone indirect sulfation process. Under the O-2/CO2 combustion condition, the calcium conversion of indirect sulfation was always higher than that of direct sulfation. The highest final calcium conversion after 60 min was found at 900 degrees C under the O-2/CO2 combustion condition. (C) 2017 Energy Institute. Published by Elsevier Ltd. All rights reserved.

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