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Fundamental study of heterogeneous KCl sulfation under oxy‐fuel combustion conditions
Author(s) -
Liu Dianbin,
Li Wei,
Li Shiyuan
Publication year - 2019
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4501
Subject(s) - sulfation , chemistry , combustion , flue gas , catalysis , inorganic chemistry , potassium , reaction rate , alkali metal , oxy fuel , chemical engineering , organic chemistry , biochemistry , engineering
Summary Under oxy‐fuel combustion condition, SO 2 in the flue gas would be accumulated by recirculation, which is conducive to the heterogeneous sulfation reaction of alkali metals. In the present study, experiments were conducted in a fixed bed to investigate the effects of operating parameters and mineral additives (SiO 2 , CaO, and Fe 2 O 3 ) on the heterogeneous sulfation of potassium chloride under oxy‐fuel combustion atmosphere. According to the results here, the heterogeneous sulfation reaction was a kinetically controlled process, with the activation energy of 93.6 kJ/mol. The reaction orders with respect to SO 2 , O 2 , and H 2 O were determined as 1, 0.6 and 0 (H 2 O involved in the reaction). While the reaction would be promoted obviously in the absence of H 2 O. The rate law of heterogeneous sulfation of potassium chloride was derived based on the experimental data. Compared with air combustion, the heterogeneous sulfation rate was lower under oxy‐fuel combustion. All the mineral additives employed would affect the sulfation reaction. The sulfation reaction can be catalyzed by Fe 2 O 3 . While CaO would suppress the reaction by competing for SO 2 with KCl. The reaction between CaO and SO 2 could also be catalyzed by Fe 2 O 3 . Besides, SO 2 was more reactive towards CaO than KCl.