| Control of sulfur dioxide emissions from coal combustion is one of our long-term environmental problems, the research and development resources recoverable sulfur coal desulfurization technology is an important research topic in the field of air pollution control. Basic Aluminum Sulfate desorption desulfurization is a desulfurization technology with double value in SO2 emission control and sulfur coal resources. To study the chemical mechanism of alkali type aluminum sulfate desulfurization process and the interfacial mass transfer mechanism, as to provide theoretical basis for alkali type aluminum sulfate desulfurization improve the important reference data.Do the experiments about the desulphurization of basic aluminum sulfate in the different temperature constant concentration and different concentration constant temperature. Under the condition of constant concentration of absorption, change the different ventilation rate, by detecting different high distribution points in the absorber on absorbing liquid concentration, analyzing the distribution regularity of reactive gases in the absorber and the influence of porosity ventilation rate on the absorption efficiency. The dynamic data show that: the concentration of SO2 has a small influence on absorption efficiency, stable at around 95%. When constant the concentration of SO2, the concentration of absorbing liquid change from 6.25% to 100%, absorption rate is higher and the oxidation rate keeps unchanged. At the same time measured at the end of all ventilation, to absorb the bottom end of the solution concentration is higher than the middle and upper levels. The experiment selected in absorbing liquid concentration is 10%, and reaction gas concentration is 5%, changing the ventilation rate. With the ventilation rate change bigger, the absorption efficiency becomes big and then becomes small.The study using numerical simulation of bubble type alkali type aluminum sulfate desulfurization process of gas liquid two phase velocity field, pressure field, the concentration of the substance and chemical reaction process is simulated, different flow field distribution is obtained by simulation, and analysis in the process of experiment the desulfurization reaction mechanism of mass transfer and absorption distribution area of the chemical reaction. Simulation results show that in laboratory puckering bubbling in the process of desulfurization absorption tower, absorption reaction mainly concentrated in the absorption tower in the upper, in a high place, three points due to the effect of shear stress bubbles to spread lateral movement, so as to increase the gas-liquid contact area, promoted the exchange of gas-liquid phase reaction, provides the experimental basis; Ventilation rate has direct influence on the size of the bubbles, and the size of the bubbles and affected the chemical process.We can know that from the analysis of the experimental results compared with simulated data, in the process of absorbing air ventilation rate determines the units of the desulfurization reaction time effective contact area, and the gas bubble size in the liquid phase and gas phase diffusion area size, concentration determines the absorption process of the number of the effective gas liquid contact reaction molecules. |
