Multi-Pollutant Formation and Control in Pressurized Oxy-Combustion: SOx, NOx, Particulate Matter, and Mercury
Gaofeng Dai,
Jiaye Zhang,
Zia ur Rahman,
Yufeng Zhang,
Yili Zhang,
Milan Vujanović,
Hrvoje Mikulčić,
Nebojsa Manić,
Aneta Magdziarz,
Houzhang Tan,
Richard L. Axelbaum,
Xuebin Wang
Affiliations
Gaofeng Dai
MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Jiaye Zhang
MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Zia ur Rahman
School of Ecology and Environment, Hainan University, Haikou 570228, China
Yufeng Zhang
MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Yili Zhang
MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Milan Vujanović
Faculty of Mechanical Engineering & Naval Architecture, University of Zagreb, Zagreb 10000, Croatia; Faculty of Mechanical Engineering, University of Maribor, Maribor 2000, Slovenia
Hrvoje Mikulčić
MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China; Faculty of Mechanical Engineering & Naval Architecture, University of Zagreb, Zagreb 10000, Croatia
Nebojsa Manić
Faculty of Mechanical Engineering, University of Belgrade, Belgrade 11120, Serbia
Aneta Magdziarz
AGH University of Krakow, Krakow 30059, Poland
Houzhang Tan
MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Richard L. Axelbaum
Consortium for Clean Coal Utilization, Department of Energy, Environmental & Chemical Engineering, Washington University in St. Louis, St. Louis, MO 63130, USA
Xuebin Wang
MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China; Corresponding author.
Oxy-combustion is a promising carbon-capture technology, but atmospheric-pressure oxy-combustion has a relatively low net efficiency, limiting its application in power plants. In pressurized oxy-combustion (POC), the boiler, air separation unit, flue gas recirculation unit, and CO2 purification and compression unit are all operated at elevated pressure; this makes the process more efficient, with many advantages over atmospheric pressure, such as low NOx emissions, a smaller boiler size, and more. POC is also more promising for industrial application and has attracted widespread research interest in recent years. It can produce high-pressure CO2 with a purity of approximately 95%, which can be used directly for enhanced oil recovery or geo-sequestration. However, the pollutant emissions must meet the standards for carbon capture, storage, and utilization. Because of the high oxygen and moisture concentrations in POC, the formation of acids via the oxidation and solution of SOx and NOx can be increased, causing the corrosion of pipelines and equipment. Furthermore, particulate matter (PM) and mercury emissions can harm the environment and human health. The main distinction between pressurized and atmospheric-pressure oxy-combustion is the former’s elevated pressure; thus, the effect of this pressure on the pollutants emitted from POC—including SOx, NOx, PM, and mercury—must be understood, and effective control methodologies must be incorporated to control the formation of these pollutants. This paper reviews recent advances in research on SOx, NOx, PM, and mercury formation and control in POC systems that can aid in pollutant control in such systems.
