The principle of desulfurization in power plants

    The principle of desulfurization in power plants is mainly to remove sulfur dioxide from coal-fired flue gas through chemical or physical means. Common desulfurization methods include limestone method, gypsum method, calcium oxide method, ammonia method, etc.

    Taking the limestone method as an example, its principle is to react limestone with sulfur dioxide in coal-fired flue gas to form gypsum, thereby achieving the effect of desulfurization. Specifically, limestone is crushed and ground into powder, mixed with water, and stirred to form an absorption slurry. It comes into contact with the flue gas in the absorption tower, and the sulfur dioxide in the flue gas reacts with the calcium carbonate in the slurry to produce calcium sulfite, which is then oxidized to form gypsum. Gypsum can be used as a by-product after treatment, while the flue gas after desulfurization is discharged into the atmosphere.

    In addition to the limestone method, gypsum method, calcium oxide method, and ammonia method are also commonly used desulfurization methods. 

The gypsum method uses limestone or lime as a desulfurization absorbent and reacts with sulfur dioxide in the flue gas to produce gypsum. The calcium oxide law utilizes the reaction between calcium oxide and sulfur dioxide to produce calcium sulfite, which is further reacted to produce calcium sulfate. The ammonia law utilizes a chemical reaction between ammonia water and sulfur dioxide to generate ammonium sulfate, which is then separated through processes such as crystallization and precipitation.

    The selection of these desulfurization methods depends on factors such as specific flue gas composition, desulfurization efficiency requirements,and operating costs. In practical applications, power plants will choose appropriate desulfurization processes based on their own situation and environmental policy requirements, in order to reduce sulfide emissions and improve environmental quality.

    Overall, desulfurization in power plants is an important environmental measure that removes sulfur dioxide from coal-fired flue gas through chemical or physical means, playing an important role in reducing sulfide emissions and improving environmental quality. With the increasingly strict environmental policies and technological progress, desulfurization technology in power plants is also constantly developing and improving.