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过程工程学报 ›› 2017, Vol. 17 ›› Issue (3): 594-599.DOI: 10.12034/j.issn.1009-606X.216355

• 过程与工艺 • 上一篇    下一篇

水蒸气和H2S对白云石循环碳酸化/煅烧过程中CO2捕获性能的影响

杨新芳1,2*  赵丽凤1,2  刘 洋1,2  肖云汉1,2   

  1. 1. 中国科学院工程热物理研究所先进能源动力重点实验室,北京 100190;2. 中国科学院能源动力研究中心,江苏 连云港 222069
  • 收稿日期:2016-11-30 修回日期:2016-12-29 出版日期:2017-06-20 发布日期:2017-06-14
  • 通讯作者: 杨新芳
  • 基金资助:
    国家自然科学基金项目

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

Xinfang YANG1,2*,  Lifeng ZHAO1,2,  Yang LIU1,2,  Yunhan XIAO1,2   

  1. 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:2016-11-30 Revised:2016-12-29 Online:2017-06-20 Published:2017-06-14
  • Contact: Xin-Fang Yang

摘要:

基于水汽变换条件,利用加压热重分析仪研究了温度、压力及煤气中H2OH2S对白云石煅烧/碳酸化循环捕获CO2性能的影响. 研究表明,吸收剂在650700时的吸收反应速率和循环稳定性明显优于550600时;加压促进吸收剂对CO2的吸收,且有H2O时促进作用更明显;H2O能有效改善吸收剂的循环稳定性,提高吸收剂在快速动力学反应控制阶段的吸收能力. 650CaO硫化反应速率远小于碳酸化反应速率,煤气中H2SCaO吸收CO2的反应动力学特性无明显影响,但硫化产物CaS在吸收剂表面累积会减少用于吸收CO2CaO量,而反应过程中H2O的存在又会减缓CaS的累积.

关键词: 水汽变换, 白云石, 脱碳, 水蒸气, 硫化氢

Abstract:

The effects of reaction temperature, pressure, H2O and H2S on the cyclic CO2 capture 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