粉粒噴動(dòng)床半干法煙氣脫硫反應(yīng)的數(shù)值模擬及氣固兩相流動(dòng)PIV實(shí)驗(yàn)
[Abstract]:90% of sulfur dioxide emissions come from coal burning, discharged into the air, oxidized to sulfuric acid and sulfate under appropriate meteorological conditions, forming haze weather and causing serious acid rain problems. At present, scholars from all over the world have developed various desulfurization technologies. The semi-dry flue gas desulfurization (FGD) technology with powder-particle spray bed has the advantages of high desulphurization rate, high absorption efficiency and low environmental pollution. It has become a promising desulfurization technology. In this paper, numerical simulation analysis is carried out according to the spray bed during the experiment. A mathematical model of water vaporization in the process of semi-dry flue gas desulfurization (FGD) in the spray bed was established to study the mass transfer and heat transfer in this process. Finally, the results of water vaporization in a powder-particle spray bed were obtained by using a two-fluid model. The results show that the injection zone and the outer part of the annular zone are the two most important areas for the occurrence of water vaporization. The gas water generated at the injection zone and the outer side of the annular zone enters the area around the bed with the air flow, and the volume fraction of the water phase at the inlet of the slurry and the top of the spring area is higher than that at the inlet of the slurry and the top of the spring. The gas temperature is the highest at the inlet, followed by the spray zone, the spring area and the annular zone. By simplifying the assumed desulfurization reaction process, the whole process was transformed into a mass transfer control process between the two phases, and a reaction model was established to study the desulfurization reaction characteristics in the semi-dry flue gas desulfurization process. A two-fluid model was used to simulate the desulfurization process in a powder-particle spray bed, and the simulation results were compared with the experimental results. The results show that the region with the largest distribution of liquid phase water is in the annular zone, and the main area of desulfurization reaction is also in the annular zone. The reaction products accumulate in the ring gap region and the outlet of the spray bed. When the reaction is stable, the desulfurization efficiency of the reaction is slightly higher than the simulated value in the literature, but it is still a little lower than the experimental value. It is still necessary to improve the optimization model to improve the accuracy of the calculation. The longitudinal eddy current generator is introduced into the gas-solid two-phase flow system in the jet bed, and the gas phase is expected to produce the longitudinal vortex through the longitudinal eddy current generator, thus driving the particle phase to realize the eddy current movement. In order to enhance the transverse mixing of gas and particles in the injection zone and annular zone of the spray bed. The spray bed with longitudinal vortex generator was studied by PIV technique. The results show that the longitudinal vortex generator enhances the transverse mixing of gas and particles in the injection and annular regions. When the diameter of the spoiler element is the same, the reinforcement effect of the spherical spoiler on the radial motion of the particle is better than that of the cylindrical spoiler. In the finite structure space of the spray bed, there is the optimum design size (diameter, installation distance) of the spoiler element, which makes the longitudinal eddy current enhance the radial motion of the particles in the spray bed to the best effect.
【學(xué)位授予單位】:西北大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:X701
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