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- Title
Investigation on the Cause of the SO 2 Generation during Hot Gas Desulfurization (HGD) Process.
- Authors
Hwang, Byungwook; Kim, Jung Hwan; Lee, Doyeon; Nam, Hyungseok; Kim, Ha Na; Baek, Jeom In; Ryu, Ho-Jung
- Abstract
In the integrated gasification combined cycle (IGCC) process, the sulfur compounds present in coal are converted to hydrogen sulfide (H2S) when the coal is gasified. Due to its harmful effects on sorbent/solvent and environmental regulations, H2S needs to be removed from the product gas stream. To simulate the H2S removal process, desulfurization was carried out using a dry sorbent as a fluidizing material within a bubbling, high-temperature fluidized bed reactor. The ZnO-based sorbent showed not only an excellent capacity of H2S removal but also long-term stability. However, unexpected SO2 gas at a concentration of several hundred ppm was detected during the desulfurization reaction. Thus, we determined that there is an unknown source that supplies oxygen to ZnS, and identified the oxygen supplier through three possibilities: oxygen by reactant (fresh sorbent, ZnO), byproduct (ZnSO4), and product (H2O). From the experiment results, we found that the H2O produced from the reaction reacts with ZnS, resulting in SO2 gas being generated during desulfurization. The unknown oxygen source during desulfurization was deduced to be oxygen from H2O produced during desulfurization. That is, the oxygen from produced H2O reacts with ZnS, leading to SO2 generation at high temperature.
- Subjects
FLUIDIZED bed reactors; HYDROGEN sulfide; SULFUR compounds; ENVIRONMENTAL regulations; GASES; DESULFURIZATION
- Publication
Catalysts (2073-4344), 2021, Vol 11, Issue 8, p985
- ISSN
2073-4344
- Publication type
Article
- DOI
10.3390/catal11080985