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In the industrial field, the flue gas produced by coal combustion contains harmful gases such as sulfur dioxide (SO2) and nitrogen oxides (NOx), so the importance of flue gas desulfurization and denitrification processes and the prevention of environmental pollution has become a global issue. In order to prevent the boiler from burning coal to produce excessive NOx to pollute the environment, it is necessary to denitrify the coal. This can be divided into three methods: pre-combustion denitrification, combustion process denitrification and post-combustion denitrification.

Flue gas desulfurization

In a wet flue gas desulfurization system, an alkaline substance (usually an alkaline solution, more commonly an alkaline slurry) and the water vapor in the flue gas meet in the nozzles of the spray tower. The SO2 in the flue gas is dissolved in water to form a dilute acidic solution, which is then neutralized with the alkaline substances dissolved in the water. The sulfites and sulfates produced by the reaction precipitate out according to the relative solubility of the different salts present in the solution.
Flue gas desulfurization (FGD) is an effective desulfurization method widely used in industry. According to the form of sulfide absorbent and by-products, desulfurization technology can be divided into dry, semi-dry and wet methods. Dry desulfurization process mainly uses solid absorbent to remove SO2 in flue gas. Usually, fine limestone powder is sprayed into the furnace, decomposed into CaO by heating, absorbs SO2 in the flue gas, and generates CaSO3, which is dusted together with fly ash, collected or discharged through the chimney. Wet flue gas desulfurization is a gas-liquid reaction between liquid absorbent and SO2 in flue gas under ionic conditions. The system uses simple equipment, stable and reliable operation, and high desulfurization efficiency.

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