Journal
CHEMICAL ENGINEERING JOURNAL
Volume 450, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.137952
Keywords
CO2 capture; Calcium looping; Calcination; Sintering prevention
Categories
Funding
- Natural National Science Foundation of China [52106180, U20A20132, 22076136]
- National Key R&D Program of China [2019YFC1903902, 2019YFC1904100, 2019YFC1904102]
- Beijing-Tianjin-Hebei Basic Research Cooperation Project [21JCZXJC00080]
- Central Government Guides the Local Science and Technology Development Fund Project of China [206Z3702G]
- Hebei Province Major Scientific and Technological Achievement Transformation Fund Support Project [2021004012A]
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The calcium looping (CaL) process is a promising CO2 capture technology, but it is limited by CaO grain sintering. This review discusses the fundamental aspects of CaCO3 calcination, including its effects on performance and methods to reduce sintering.
The calcium looping (CaL) process is a promising CO2 capture technology based on a reversible reaction, CaO(s) + CO2(g) <-> CaCO3(s), and the forward and reverse directions of this reaction are often referred to as carbonation and calcination. Although CaO-based sorbent has the advantages of abundant reserves, low cost, and high theoretical capacity of CO2, it is limited by significant sintering of CaO grains over carbonation/calcination cycles, resulting in a rapid decline in CO2 capture performance. As an essential part of CaL technology, the CaCO3 calcination stage has a decisive influence on the sintering degree of CaO grains. In this work, a systematic understanding of fundamental aspects of the CaCO3 calcination is reviewed. The effects of calcination reaction conditions on the sintering of CaO grains and the resulting decline in CO2 capture performance during the cyclic operation were discussed. A number of efforts to reduce the calcination reaction temperature, thus slowing down CaO grains sintering, have been summarized, such as decreasing CaCO3 crystallinity, doping CaCO3 with alkali/alkaline earth salt, reducing CO2 absolute pressure, injecting steam, as well as in situ converting CO2. Finally, the future development trends for the above strategies to reduce the CaCO3 calcination temperature are also recommended. We hope this work can help and inspire researchers to make breakthroughs in this field.
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