The growing smog threat in China has made improving environmental quality a pressing issue for the Chinese government. Coal-fired power plants are undoubtedly the main emission source of many air pollutants. In September 2014, the three national ministries and commissions jointly issued the "Action Plan for Energy Saving and Emission Reduction Upgrade and Transformation of Coal Power (2014-2020). Emissions indicators: Emissions of nitrogen oxides, sulfur dioxide, and soot have been formulated with strict regulations that meet or exceed the requirements of developed countries and regions, and strive to promote the transformation of coal-fired power plants into resource-saving and environment-friendly enterprises to achieve "ultra-clean emissions."