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针对某火电厂大型单蜗壳压水室脱硫泵径向力引起泵轴振动的问题,设计了双蜗壳压水室脱硫泵。通过数值模拟,得到两种方案泵的性能曲线以及在不同工况下脱硫泵的径向力,通过对两种方案脱硫泵的速度场、静压场的分析,验证了双蜗壳压水室脱硫泵设计的合理性。结果表明:双蜗壳压水室的结构设计合理,流体在两个流道中流动顺畅,削减了从叶轮流出液体的动反力,从而有效地减小泵的径向力;双蜗壳压水室与单蜗壳压水室脱硫泵的水力性能接近,在1.0Q0时,双蜗壳压水室脱硫泵比单蜗壳压水室脱硫泵扬程下降2.12%,效率下降量为2.34%,仍能够满足要求。
In view of the vibration of the pump shaft due to the radial force of the large single volute water chamber desulfurization pump in a thermal power plant, a double volute pressure water chamber desulfurization pump is designed. Through the numerical simulation, the performance curves of the two schemes and the radial force of the desulfurization pump under different working conditions are obtained. By analyzing the velocity field and the static pressure field of the two schemes desulfurization pumps, it is verified that the double-volute water pressure chamber The desulfurization pump design rationality. The results show that the design of double volute water pressure chamber is reasonable, the flow of fluid in the two flow channels is smooth and the dynamic reaction force of the liquid flowing out from the impeller is reduced, so the radial force of the pump is reduced effectively. Compared with the single volute pressure water chamber desulfurization pump, the hydraulic performance of the chamber is similar to that of the single volute pressure water chamber desulfurization pump. At 1.0Q0, the pressure drop of the double volute water chamber desulfurization pump was 2.12% To meet the requirements.