Study on the Key Technology of CO₂ Compression and Purification in Oxy-Fuel Combustion Coal-Fired Power Plant

Abstract

Oxy-fuel combustion is one of the most promising technologies for CO2 capture. It is of great practical significance to gain insights into the key technology of compression and purification. In this study, a 50 kg/h CO2 compression and purification test platform is constructed, which is used to develop the key technology and equipment suitable for the flue gas for CO2 compression and purification. Through this study, it is verified that this technology is feasible and high CO2 concentration is collected from flue gas. Meanwhile, the test platform can operate stably. The results indicate that the purity of liquid CO2 obtained from the purification tower is more than 99%, the optimal conditions of the operation temperature (−30 °C) and pressure (3.0 MPa) are used, the performance of the test platform meets the requirement of load from 75 to 110% of design parameters, and furthermore, the technology process, equipment layout, and operation parameters of the test are explored, which can provide a reference for future engineering applications.

Synergistic Removal of SOx and NOx in CO2 Compression and Purification in Oxy-Fuel Combustion Power Plant

“…Residence time is calculated according to the data from the literature in the test. The residence time of a different device was determined through calculation and analysis 44 based on the following parameters: tower height, cross-sectional area, and flue gas flow into the flue gas. The designed residence time of different towers of this platform is about twice of that in the literature.…”

“…A simulation model of two-stage compression was built based on the experimental results, and good agreement was achieved between experimental and simulated data. Wu et al 35 studied the compression of CO 2 in oxy-fuel combustion systems. The influence of CO 2 concentration, temperature, or pressure on the liquefaction ratio and energy consumption was also investigated.…”

Review on the Development of Sorbents for Calcium Looping

“…Another emerging CO 2 capture technology is oxy-fuel combustion. An oxy-fuel combustion demonstration project has been established in Hubei Province, China, hosted by Huazhong University of Science and Technology . In the process, fuel is combusted in a mixture of CO 2 from recycled flue gas and O 2 produced by an air separation unit (ASU) with the generation of concentrated CO 2 ready for transport and storage .…”

“…An oxy-fuel combustion demonstration project has been established in Hubei Province, China, hosted by Huazhong University of Science and Technology. 26 In the process, fuel is combusted in a mixture of CO 2 from recycled flue gas and O 2 produced by an air separation unit (ASU) with the generation of concentrated CO 2 ready for transport and storage. 27 However, a large amount of energy is required to operate the cryogenic ASU to produce pure O 2 , leading to a decrease of 8−12% in the overall net efficiency.…”