China has accumulated rich experience in air pollution control. When the United States faced a serious air pollution problem, it began to learn from China's treatment experience. The United States has introduced China's air pollution prevention and control technology in some areas, such as desulfurization and denitrification technology for coal power plants, to reduce the emission of air pollutants.
Desulphurization technologies commonly used in coal power plants include in-furnace desulphurization and post-furnace desulphurization. Desulfurization in the furnace means that in the combustion process, the use of additives to react with sulfur elements in the coal to produce sulfate and other substances, which are discharged with the slag. Post-furnace desulfurization refers to the reaction of sulfur dioxide in the flue gas through absorbent or catalyst to produce sulfate and other substances before the flue gas is discharged, and then after treatment.
Denitration technology includes denitration before combustion, denitration during combustion and denitration after combustion. Among them, denitration before combustion and denitration during combustion are more commonly used methods. Denitrification before combustion is mainly to remove nitrogen elements in coal by washing and other ways to reduce the generation of nitrogen oxides. Denitrification in combustion process is to reduce nitrogen oxides to nitrogen or other substances by controlling combustion conditions and adding reducing agents.
In general, the desulfurization and denitrification technology of coal power plants has undergone multiple stages of development and improvement, and will continue to play an important role in the future. At the same time, with the continuous upgrading of technology and the strengthening of environmental protection policies, the desulfurization and denitrification technology of coal power plants will also usher in a broader development prospect.
The impact of coal-fired power plants on air pollution cannot be ignored. In the United States, coal-fired power plants account for more than 90 percent of total coal consumption each year. Not surprisingly, coal-fired power plants account for about half of all SO2 emissions in the United States and 10 percent of NOx.In the United States, most coal-fired power plants use wet flue gas desulfurization systems to control SO2 emissions, low-nitrogen burners, exhaust air, and selective catalytic reduction systems to control NOX emissions, and electrostatic precipitators to control particulate matter. About half of coal-fired power plants also use activated carbon injection systems with bag dust collectors to control mercury emissions.
In general, the environmental requirements for coal-fired power plants in the United States are similar to those in China, including total volume controls, operating standards and technical requirements.
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