NDLI: Phase diagram of CaSO$_{4}$ reductive decomposition by H$

Content Provider	Springer Nature Link
Author	Zheng, Min Xing, Yanbing Zhong, Simei Wang, Hua
Copyright Year	2017
Abstract	The CaSO$_{4}$ reductive decomposition is an interesting issue in both the reduction zone of fluidized bed combustors (FBCs) for coal combustion and the fuel reactor of chemical-looping combustion (CLC) system. Under CO or H$_{2}$ atmosphere, CaSO$_{4}$ is reduced to CaS and CaO, together with the releases of gas sulfides, which causes environmental pollutions. To lessen sulfur release, it is important to figure out the chemical stability of CaSO$_{4}$ reductive decomposition. Thus, the chemical stability of CaSO$_{4}$/CaS/CaO under CO or H$_{2}$ atmosphere was studied in consideration of SO$_{2}$, COS and H$_{2}$S emissions. The results show that regions I (VI), II (V), and III (IV) are the stability fields of CaSO$_{4}$, CaS and CaO, respectively. The range for CaO stability is increasing with reaction temperature and partial pressures of CO$_{2}$ and H$_{2}$O. Within the reaction temperature range of 800 and 1,000 °C, when the CaSO$_{4}$-CO-H$_{2}$ reaction system reaches the triple equilibrium point, the main gas sulfur released is SO$_{2}$, followed by H$_{2}$S, while COS generation is much smaller. In a real reaction system, when the values of real P$_{ H2}$/P$_{ H2O }$ (P$_{ CO }$/P$_{ CO2}$), P$_{ SO2}$, P$_{ H2S }$ (P$_{ COS }$), P$_{ H2O }$ (P$_{ CO2}$) and T fall into Region I (IV), or II (V), the final product should be CaSO$_{4}$ or CaS, and the sulfur release from CaSO$_{4}$ reduction can be controlled.
Starting Page	1266
Ending Page	1272
Page Count	7
File Format	PDF
ISSN	02561115
Journal	Korean Journal of Chemical Engineering
Volume Number	34
Issue Number	4
e-ISSN	19757220
Language	English
Publisher	Springer US
Publisher Date	2017-02-13
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	CaSO$_{4}$ Reductive Decomposition Phase Diagram SO$_{2}$ Emission H$_{2}$S Emission COS Emission Industrial Chemistry/Chemical Engineering Catalysis Materials Science Biotechnology
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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