Development of high-gravity technology for removing particulate and gaseous pollutant emissions: Principles and applications

In this study, an integrated approach to applying the high-gravity technology for control of multiple air pollutants, such as SOx, NOx, and particulate matter as well as greenhouse gases, such as CO2, in a flue gas was proposed and reviewed. The high-gravity technology using a rotating packed bed has been recognized as a process intensification device with excellent micro-mixing efficiency and mass transfer rate between the gas and liquid phases. Implementation of the high-gravity technology can significantly improve the efficiency of end-of-pipe air pollution control. This paper first provides the features, principles and applications of the high-gravity technology. Then, the mechanism and performance of SOx, NOx, particulate matter and CO2 removal by the high-gravity process are discussed. Finally, the use of high-gravity technology for removing particulate and gaseous pollutant emissions to achieve the goal of integrated air pollution control in industry is illustrated. To move ahead with the industrial upgrades needed for compliance with the future air quality standards, the high-gravity technology should be considered as a technically and economically feasible alternative to simultaneously reduce more than one type of air pollutants, including NOx, SOx, particulate matter and CO2 in a timely manner.