Numerical Simulation Of Flue Gas Desulfurization Moving Bed Reactor By Carbonaceous Materials

Sulfur dioxide(SO2), one of the main atmospheric pollutants, is heavily harmful to human health, agricultural production and natural environment. Thus flue gas desulfurization has become a significant issue and researchers have developed a series of desulfurization technologies over decades, of which dry desulfurization process by carbonaceous materials has high desulfurization efficiency, low water consumption and sulfur recovery allowance. This process has a proven track record in some commercial plants. There exists an unsolved problem on desulfurization capacity distribution at different positions in the cross-flow moving bed. In this paper, numerical simulation study is conducted to try to solve this problem. Main research are as follows:First, discrete element model for particle motion is set. It shows good agreement by comparing particle flow character of simulation and experimental data in the literature, which means discrete element model simulation is applicable for dense particle flow of low descending velocity.In the second part, porous media model is selected for fixed bed desulfurization reactor to study flue gas velocity and sulfur dioxide concentration in the fixed bed.The last part focuses on the investigation of gas-solid flow properties in a rectangular cross-flow moving bed reactor. Particle behavior is discussed in moving beds with different particle outlet. Systematic comparison is also conducted on effects of placement of roll feeder and insert in moving bed reactor. These are significant for further studies and industrial applications.