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Research on kinetics of limestone desulphurization reactions under a reducing atmosphere

✍ Scribed by Zhaoping Zhong; Jixiang Lan; Baosheng Jin; Daji Li; Mingyao Zhang

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
297 KB
Volume
23
Category
Article
ISSN
0363-907X

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✦ Synopsis

With the development of the second generation pressurized fluidized-bed combustion combined cycle (PFBC-CC), integrated gasification combined cycle (IGCC) and the technology of staged combustion for lower emission of NOx, limestone desulphurization under a reducing atmosphere is gradually becoming a very important problem. This paper presents static tests of limestone desulphurization reaction under a reducing atmosphere. The experiment was done by an atmospheric thermogravimetric analyzer (TG-DTG8110, made in Japan). The sorbent is limestone from Nanjing, China. Its CaCO percentage is 93)75% and particle mean diameter is 0)63 mm. Mixed gas concentrations are as follows. (N #H S) mixed gas: [H S] is 1)366E4, 2)277E4 and 2)73E4 mg (Nm); (O #N ) mixed gas: [O ] is 3, 5, 7 and 100%. Test temperatures are 920-930Β°C and 835-845Β°C. The optimal reaction conditions were obtained from the experiment. Sulphidation reaction at about 925Β°C and oxidation reaction at about 848Β°C are carried out easily. Through numerical handling, the dynamic equations of sulphidation and oxidation reactions are also obtained.

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