The Simulation And Study Of The Flow Field And Temperature Field Inside The Spraying-tower

The peak of power consumption will be brought by the rapid development of the industry. Thermal power is still the main component of electric energy at present. More and more attention has been paid on the atmospheric pollution caused by coal-fired power in our country. The sulfur dioxide (SO2), one of the thermal power plant flue gases, is dangerous to the environment and human. Effective SO2 control technology can not only reduce the environmental pollution but also the sulfur can be recovered in order to conserve resources. In this paper, the spray which is used in the limestone-gypsum wet flue gas desulphurization has been studied. Unstructured tetrahedral mesh has been adopted through the software of Gambit based on the simplify model of the absorption tower. According to the special conditions in the tower, the k-s Model, Discrete Phase Model, Porous Medium Model are applied as the theoretical basis to numerically calculate the three-dimensional flow field and temperature field through the software of Fluent. The Finite Volume Method is adopted; speed and pressure are chosen as the original variables. The Implicit Formulation, SIMPLE Algorithm, the Second Order Upwind Discretization are adopted. Discuses the influence on the flow and temperature field distribution which is caused by various entrance form in different capacity of the units. From the conclusion lean inlet is better than horizon inlet. Lean inlet can make the gas flow evenly and the pressure drops significantly lower. But the tilt angle should not be too large, better than 15°. The entrance of 120°distribution is better than 180°distribution as well as single entry conditions on the flow distribution. This advantage becomes more apparent as unit capacity increases. Moreover, with the capacity of the unit increases, the influence of distribution of the entrance to the flow field gradually weakened. Then the qualitative analysis is given to the corresponding design and operation parameters based on the simulation results. The data obtained is generally consistent with the calculated values as well as actual operation data. It has been proved that the numerical calculating method used for gas flow is reliable. Finally some reasonable suggestions and effective measures for the optimization design of the absorber are given based on the analysis in order to provide theoretical references.