Industrial application of polymeric environmental desulfurization agent(2)

The oxidizing agent improves the reaction efficiency of SO2 to SO3 conversion and sulfite to more stable sulfate conversion, and the polymer activator can reduce the reaction temperature of these two processes, while some groups of the polymer can directly capture SO2 to generate organic sulfate. 

Surfactants can promote the absorption of sulfur dioxide by carbonates or metal oxides, and sulfur in the raw material is oxidized at 300 to 600 ℃ to produce SO2 gas. In the case of temperature below 600 ℃ near the secondary cylinder, the absorption of SO2 mainly relies on CaO. 

However, the decomposition rate of CaCO3 in the secondary and tertiary cyclones is extremely low, and not enough CaO is generated, and thus the absorption efficiency is not high, resulting in the flow of SO2 to the secondary cyclone. The absorption efficiency of SO2 can be effectively improved by adding desulfurizing agent near the secondary cylinder.

Through the study of the desulfurization mechanism of polymeric environmental desulfurization agent, the analysis of industrial application data and the comparison with the current desulfurization process adopted by cement enterprises, the sources and ways of SO2 emission from cement enterprises are clarified, and the feasibility and scientificity of this desulfurization product process are verified, which opens up a new way for the desulfurization work of cement enterprises. The advantages of this project are summarized as follows.

(1) Compared with the traditional terminal desulfurization treatment technology, based on the production cause and mechanism of SO2 emission, the front-end treatment was developed independently, using polymer environmental desulfurization technology (oxidation, catalysis and capture) to directly adsorb SO2 and improve the SO2 absorption capacity of the original system.

(2) The introduction of polymer materials at the same time as the reaction substantially improves the desulfurization efficiency (more than 90%), and the desulfurization range is above 600 mg/Nm³. The amount of addition is small and the cost of use is low.

(3) The effect is rapid and can be seen 15~20 min after adding, and it is convenient to add and flexible to use. It can be added when the raw mill is shut down (or high sulfur raw material is used), and used sparingly or stopped when the raw mill is started (low sulfur raw material is used).

(4) Relative to wet desulfurization, it basically does not require hardware investment, and relative to ammonia desulfurization, this product process is non-corrosive to equipment, safe and environmentally friendly, and does not cause secondary pollution.