December 30, 2020

Activated carbon for flue gas desulfurization

Sulfur dioxide is the main pollutant in industrial flue gas discharged into the atmosphere. Thermal power plants, ferrous and non-ferrous metallurgical industries, chemical industries, and petroleum processing industries are the main pollution sources that produce sulfur dioxide. The activated carbon flue gas desulfurization technology has no secondary pollution, the desulfurization adsorbent can be recycled, and the desulfurization efficiency is high. It is the main development direction of the future desulfurization technology.

Pre-desulfurization and high chimneys to disperse sulfur dioxide before fuel combustion and ore processing cannot fundamentally solve the problem. The characteristics of high flue gas content and low sulfur dioxide content (the flue gas contains 0.08%0.16% sulfur dioxide, 10%13% water vapor, 3%~66% oxygen, 10% carbon dioxide, and the rest is nitrogen).powdered activated carbon manufacturers in china The coal-based activated carbon adsorption method for desulfurization can effectively remove sulfur dioxide in the flue gas, which not only prevents air pollution, but also recovers sulfur. Activated carbon flue gas desulfurization is one of the applications of activated carbon in waste gas treatment.

When sulfur dioxide exists alone, the adsorption of sulfur dioxide by activated carbon is a pure physical adsorption. However, when the flue gas is processed, the adsorption capacity is significantly increased due to the presence of oxygen and water vapor in the flue gas and chemical adsorption accompanied by chemical reactions. Reaction machine. In the desulfurization process, when the active points on the surface of the activated carbon are adsorbed and saturated, the sulfur is desorbed and recovered to obtain products such as sulfuric acid or sulfur, sulfur dioxide, sulfur press, and gypsum.

There are many process methods for flue gas desulfurization by activated carbon, but the adsorption methods of activated carbon for sulfur are mainly dry fixed bed oxidation adsorption, dry moving bed oxidation adsorption, and solid fixed bed oxidation adsorption. Among them, the wet oxidation adsorption method is suitable for equipment with a flue gas processing volume of less than 100,000 standard m³/h, and the activated carbon dry process sintering flue gas desulfurization technology is suitable for equipment with a large gas processing volume.

In order to improve the adsorption capacity of activated carbon for sulfur dioxide, the activated carbon can be treated with concentrated sulfuric acid at 100~250℃ to introduce various functional groups, or the activated carbon can be loaded with metal oxides such as copper and chromium.