Numerical Simulation Of Flow Field In Wet Desulfurization Spray Tower

Taking the spray tower based on ammonia process as the research object, the simulation on the operation situation of the tower and optimizing the tower structure were conducted with the finite volume method, which provided reference for our own design and optimization of desulfurization equipment.In this paper, the three-dimensional two-phase flow in wet spray tower is numerically simulated by using k-εmodel and Discrete Phase Model (DPM) and selecting explicit difference scheme and SIMPLEC algorithm. The paper has observed the internal flow of the empty tower under different operating conditions, from the pictures of velocity cloud and path line, it presents that the eddy of streamline is serious and the area of higher velocity appears near the left wall of the tower, it leads to uneven distribution of gas-liquid ratio in the case of spray and reduce desulfurization efficiency.After installment of the distribution ring in empty tower, this paper discusses the flow field in spray tower is influenced under the conditions that one distribution ring is installed in different heights of the tower and two distribution rings are installed in both high and low positions . On this basis, it analyzes furtherly that the flow field in spray tower is impacted under the conditions that different flow-through sections. From the curve of velocity-position which is located at the cross section of tower's different height, when the two distribution rings are installed in both high and low positions and the flow-through section was 75%, the flow field in spray tower is improved significantly, meanwhile, the area of higher velocity near the left wall of the tower reduces obviously and the speed in the center of the tower is higher than the edge, improving desulfurization efficiency. In the case of spray, the desulfurization efficiency directly is affected by the different of jet angles and level spacing interval. As jet angles increasing, the coverage rate of liquid film also promotes accordingly. Because the interval of level spacing was increased, the gas-liquid contact time is longer, it is beneficial to the removing of the sulfur dioxide of flue gas.