混流式脱硫浆液泵性能研究与增容改造

发布时间：2019-06-14 19:13

【摘要】：本文以某电厂600MW混流式脱硫浆液循环泵为研究对象,由于其出力和效率达不到电厂脱硫要求,故对其进行增容改造。由于浆液泵改造设计复杂,故需综合考虑多方因素,在泵理论性能研究的基础上,探寻最优改造方案,本文主要通过适当增大叶轮出口直径、出口安放角和包角,来提高泵的扬程和流量,从而提高电厂脱硫效率。利用Pro/E三维建模软件分别对改造前、后的泵进行三维建模。运用Gambit软件对流道进行网格划分,并结合数值模拟软件FLUENT6.2,分别选用Euler多相流模型、标准的k-ε湍流模型和SIMPLEC算法,对改造前、后泵内固液两相流流场进行数值模拟。通过固液两相流流场的速度分布、压力分布和固体颗粒浓度分布情况,研究改造前后泵性能的改变。模拟结果显示,改造后脱硫浆液泵扬程、流量和脱硫效率都增大。虽然改造后脱硫浆液泵叶轮和蜗壳隔舌处磨损程度有所增加,但是,内部流场分布合理,整体运行稳定性较好,叶片压力分布趋于均匀,泵的抗汽蚀性能有所提高。据现场测量结果显示,改造后泵的出力和脱硫效率都得到了很大提高。数值模拟与现场测量结果吻合,由此可见,在模型选取合理的前提下,数值模拟对泵性能的研究和工程实际改造具有一定的预测和指导作用。
[Abstract]:In this paper, the 600MW mixed flow desulphurization slurry circulating pump in a power plant is taken as the research object. Because its output and efficiency can not meet the desulphurization requirements of the power plant, its capacity enhancement and transformation are carried out. Because of the complexity of the revamping design of the slurry pump, it is necessary to consider many factors synthetically. On the basis of the study of the theoretical performance of the pump, the optimal transformation scheme is explored. In this paper, the lift and flow rate of the pump are improved by properly increasing the outlet diameter, outlet placement angle and inclusion angle of the impeller, so as to improve the desulphurization efficiency of the power plant. The three-dimensional modeling of the pump before and after the transformation is carried out by using Pro/E three-dimensional modeling software. The flow channel is meshed by Gambit software, and the Euler multiphase flow model, standard k-蔚 turbulence model and SIMPLEC algorithm are selected to simulate the solid-liquid two-phase flow field in the pump before and after the revamping. Through the velocity distribution, pressure distribution and solid particle concentration distribution of solid-liquid two-phase flow field, the change of pump performance before and after revamping is studied. The simulation results show that the head, flow rate and desulphurization efficiency of desulphurization slurry pump increase after revamping. Although the wear degree of impeller and volute tongue of desulphurization slurry pump increases after revamping, the internal flow field distribution is reasonable, the overall operation stability is good, the pressure distribution of blade tends to be uniform, and the cavitation resistance of the pump is improved. According to the field measurement results, the output and desulphurization efficiency of the modified pump have been greatly improved. The numerical simulation is in good agreement with the field measurement results. It can be seen that the numerical simulation can predict and guide the pump performance research and engineering transformation on the premise of reasonable model selection.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH311

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