With the emission regulation for dust, SO₂, NO_x, Hg and other pollutants from coal-fired power plants becoming more stringent, the purification of flue gas from power plants has become a very popular area of research. The toxicity of mercury is causing widespread concern for flue gas mercury removal. The key to the study of flue gas mercury removal technology is the efficient conversion and removal of elemental mercury. Activated carbon injection is a mature technology, among the flue gas mercury removal technology, however its cost is too high. The fly ash of flue gas has a certain adsorption effect on mercury, furthermore, its adsorption performance can be improved through modification. Advanced oxidation, especially photocatalytic technology, has attracted increasing attention. Titanium-based, bismuth-based and other photocatalyst have better mercury removal efficiency under low temperature conditions, and it is becoming an important aspect of flue gas mercury oxidation and emission reduction. To realize the combined removal of SO₂, NO_x, Hg and other pollutants by the optimization operation of existing flue gas purification equipment, is the direction of research and industrial application of mercury purification in power plant, and the scientific problem is the source of promoting the research and application of flue gas purification technology.
Contents
1 Introduction
2 Mercury removal technologies of the flue gas from power plants
2.1 Adsorption
2.2 Photocatalytic oxidation
2.3 Low temperature plasma
2.4 Combined removal of mercury with various pollutants
3 Conclusion and outlook