SIMULATION OF SO2 RELEASE PROCESS IN CEMENT PRE-CLASSIFICATION SYSTEM

In the cement pre-decomposition system, the main source of SO2 is the sulfur-containing compounds in the cement raw materials and fuels. If the concentration of SO2 is too high, it will affect the normal operation of the cement kiln pre-decomposition system, and even cause the calciner and pre-heater to produce skinning and then blockage. Studying the distribution of SO2 in the cement pre-decomposition system is of great significance to ensure the safe operation of the cement pre-decomposition system. The process simulation software Aspen Plus is used to simulate the process of rotary kiln, calciner, preheater. SP boiler, humidification tower, and bag dust collection. We use field test data to verify the reliability of the simulation results. The results show that the SO2 content presents a trend of first rising and then falling. The SO2 content from the rotary kiln to the C4 exit increases significantly, and the SO2 content increases slowly from the C3 exit to the CI exit. From the outlet of the preheater, through the SP boiler, humidifying tower, bag dust collection, and the chimney, the SO2 is 298.6 mg/m3. The simulation results show that the application of Aspen Plus to simulate the SO2 content in the cement pre-decomposition system has a certain feasibility, and the model setting is flexible, which can provide a certain feasibility reference for the SO2 control in the cement pre-decomposition system.