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| Research and Demonstration Application of Oxy-fuel Combustion Carbon Reduction Technology and Equipment under the Dual Carbon System in the Cement Industry |
| Tianjin Cement Industry Design & Research Institute Co., Ltd. , Tianjin 300400, China |
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Abstract This paper analyzes the sources and characteristics of carbon emissions and the main technical paths of carbon emission reduction in the cement industry. Therefore, breakthrough technologies such as novel and efficient carbon dioxide capture, utilization, and storage technologies, including oxy-fuel combustion, calcium cycling and post-combustion capture were introduced. The results indicate that the use of oxy-fuel combustion technology has lower overall costs and higher carbon reduction efficiency. Through tackling key core technologies and equipment for oxy-fuel combustion, developing the patented technology of “strong swirly pre-combustion furnace + CO2-enriched combined calciner”. Based on CPFD simulation, combustion models in O2/CO2 and raw meal decomposition models under high CO2 concentrations were established in depth to direct oxy-fuel coupled flameless combustion technology and thermal simulation pilot tests. The largest cement industrial-grade demonstration line with an annual capture capacity of 200 000 tons of CO2 in the worldwide has been established. Practical applications show that using oxy-fuel combustion technology can enhance the CO2 concentration in flue gas to over 80%. Finally, the concentration of CO2 flue gas can be further increased to more than 99% by pressure swing adsorption and low temperature distillation.
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Received: 07 August 2024
Published: 25 September 2024
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