Effects of H2O and H2S on Cyclic CO2 Capture Activity of Dolomite during&nbsp;&nbsp;Calcination/Carbonation Process

Xinfang YANG  Lifeng ZHAO  Yang LIU  Yunhan XIAO

doi:10.12034/j.issn.1009-606X.216355

The Chinese Journal of Process Engineering >

2017 , Vol. 17 >Issue 3: 594 - 599

DOI: https://doi.org/10.12034/j.issn.1009-606X.216355

Process & Technology

Effects of H₂O and H₂S on Cyclic CO₂ Capture Activity of Dolomite during Calcination/Carbonation Process

Xinfang YANG Lifeng ZHAO Yang LIU Yunhan XIAO

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1. Key Lab of Advanced Energy & Power, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China; 2. Research Center for Clean Energy and Power, Chinese Academy of Sciences, Lianyungang, Jiangsu 222069, China

Received date: 2016-11-30

Revised date: 2016-12-29

Online published: 2017-06-14

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Abstract

The effects of reaction temperature, pressure, H₂O and H₂S on the cyclic CO₂capture activity of dolomite during calcination/ carbonation process were studied with a thermogravimetric analyzer, based on the water gas shift reaction condition. The results indicated that the absorption rate and the cyclic stability at 650 and 700℃ are obviously better than those at 550 and 600℃. The increase of pressure promotes the CO₂ absorption of sorbent, and the enhancement becomes more obvious with H₂O present. H₂O can effectively improve the cyclic stability of the sorbent and enhance the capture capacity at the fast kinetic reaction control stage. At 650℃, the sulfidation rate is far lower than the carbonation rate of CaO. H₂S in the syngas shows no obvious effect on the kinetics of the carbonation reaction. However, the accumulation of sulfidation product CaS over CaO sorbents will reduce the CaO amount for CO₂ absorption, and the H₂O will restrain the accumulation of CaS during the reaction process.

Key words： water - gas shift; dolomite; CO2 capture; H2O; H2S

Cite this article

Xinfang YANG Lifeng ZHAO Yang LIU Yunhan XIAO . Effects of H₂O and H₂S on Cyclic CO₂ Capture Activity of Dolomite during Calcination/Carbonation Process[J]. The Chinese Journal of Process Engineering, 2017 , 17(3) : 594 -599 . DOI: 10.12034/j.issn.1009-606X.216355

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