There are thousands of thermal power plants in China. Although there are many ways to generate electricity, such as nuclear power generation, Water Conservancy Power generation, wind power generation, solar power generation and thermal power generation, thermal power generation still occupies a considerable proportion in China. From the point of view of environmental protection, thermal power generation is the most polluted way to generate electricity. The main component of coal is carbon accounting for about 60-80%, followed by hydrogen, oxygen, sulfur, nitrogen, water and ash accounting for 20-40%, sulfur in the combustion process of coal is the largest pollution, sulfur dioxide will be generated when the incomplete combustion of sulfur, will seriously pollute the environment, is the main way to produce acid rain pollution of water sources. Why is it said that the "mill is the environmental protection guardian in thermal power plants" is because it effectively handles the sulfur emissions from coal combustion. This is what we call "power plant desulfurization".