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A SPIRAL DIVERSION WATER DISTRIBUTION DEVICE WITH A SPHERICAL HIGH-FLOWRATE MIXED BED
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摘要: 基于电厂球形高速混床周期制水量下降的问题,建立典型球形高速混床布水装置的三维模型,采用计算流体动力学(简称CFD)和流固耦合方法研究了穹形、波形挡板以及自研的螺旋导流布水装置在凝结水分布、流动特性以及流动载荷作用下产生的结构力学性能变化等。以速度标准偏差作为流体流动均匀性指标,以多孔板最大形变量作为抗变形指标。计算结果表明:在流量为200~700 t/h时,与穹形挡板和波形板结构相比,自研螺旋导流器布水装置布水均匀性提高了47.3%~59.3%,最大形变量下降了12.2%~27.2%,布水效果改善明显。Abstract: In this paper, aiming at the problem of the decrease of periodic water production volume of the spherical high-speed mixed bed in the power plants, a three-dimensional model of a typical spherical high-speed mixed bed water distribution device was established, and the dome, wave baffle and self-developed spiral diversion were studied using CFD and fluid-solid coupling methods. The performance and difference of the water distribution device in terms of the distribution of condensed water, the flow characteristics, and the changes in the mechanical properties of the structure under the action of the flow load were determined. The speed standard deviation was used as the fluid flow uniformity index, and the maximum deformation of the porous plate was used as the anti-deformation index. The calculation results showed that, at a flow rate of 200~700 t/h, compared with the dome-shaped baffle and corrugated plate structure, the water distribution uniformity of the self-developed spiral deflector water distribution device was increased by 47.3%~59.3%. And then the maximum deformation decreased by 12.2%~27.2%, and the water distribution effect was improved significantly.
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Key words:
- high-flowrate mixing bed /
- water distribution device /
- CFD /
- uniformity /
- fluid-structure interaction
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