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Hydrodynamic Design of Thrust Ring Pump for Large Hydro Turbine Generator Units

  • Lai, Xide (School of Energy and Power Engineering, Xihua University) ;
  • Zhang, Xiang (School of Energy and Power Engineering, Xihua University) ;
  • Chen, Xiaoming (School of Energy and Power Engineering, Xihua University) ;
  • Yang, Shifu (Dongfang Electric Machinery Co. Ltd.)
  • 투고 : 2015.01.16
  • 심사 : 2015.01.31
  • 발행 : 2015.03.31

초록

Thrust-ring-pump is a kind of extreme-low specific speed centrifugal pump with special structure as numerous restrictions from thrust bearing and operation conditions of hydro-generator units. Because the oil circulatory and cooling system with thrust-ring-pump has a lot of advantages in maintenance and compactness in structure, it has widely been used in large and medium-sized hydro-generator units. Since the diameter and the speed of the thrust ring is limited by the generator set, the matching relationship between the flow passage inside the thrust ring (equivalent to impeller) and oil bath (equivalent to volute) has great influence on hydrodynamic performance of thrust-ring-pump. On another hand, the head and flow rate are varying with the operation conditions of hydro-generator units and the oil circulatory and cooling system. As so far, the empirical calculation method is employed during the actual engineering design, in order to guarantee the operating performance of the oil circulatory and cooling system with thrust-ring-pump at different conditions, a collaborative hydrodynamic design and optimization is purposed in this paper. Firstly, the head and flow rate at different conditions are decided by 1D flow numerical simulation of the oil circulatory and cooling system. Secondly, the flow passages of thrust-ring-pump are empirically designed under the restrictions of diameter and the speed of the thrust ring according to the head and flow rate from the simulation. Thirdly, the flow passage geometry matching optimization between thrust ring and oil bath is implemented by means of 3D flow simulation and performance prediction. Then, the pumps and the oil circulatory and cooling system are collaborative hydrodynamic optimized with predicted head-flow rate curve and the efficiency-flow rate curve of thrust-ring-pump. The presented methodology has been adopted by DFEM in design process of thrust-ring-pump and it shown can effectively improve the performance of whole system.

키워드

참고문헌

  1. WU Zhongde, ZHANG Hong, ZHANG Renjiang and WU Junling, 2004, "Technology of outer circulation with runner-pump for hydro generators," Central China Electric Power, Vol. 17(6), pp. 32-34. (in Chinese)
  2. CAO Kai, 2010, "Oil-throw treatment for generator's thrust bearing of Shuibuya Hydropower Station," Hydropower and Energy, pp. 60-62. (in Chinese)
  3. YI Haiting, ZHANG Dongsheng, LIU Qidong and WANG Jiangang, 2009, "Design of fully air-cooled 700MW Laxiwa hydro generator," Water Power, Vol. 35(11), pp. 37-38. (in Chinese)
  4. LEI Ting, HU Xinfan, QIN Liusheng, 2012, "Research on thrust supports performance and runner-pump extrinsic technology of Silver Plate Hydropower Station," Journal of Mechanical & Electrical Engineering, Vol. 29(9), pp.1042-1045. (in Chinese)
  5. LI Renhong, GAN Nan, 2002, "The design characteristics of Tianshengqiao Secondary Hydropower Station's hydraulic machinery," Guizhou Water Power, Vol. 16, pp. 58-61. (in Chinese)
  6. Lai Xide, 2013, "Research report on hydrodynamic optimization of thrust-ring-pump for hydroelectric units," Xihua University, China. (in Chinese)
  7. ZHANG Xiang, WANG Yang, XU Xiaoming and WANG Hongyu, 2011, "Energy conversion characteristic within impeller of low specific Speed centrifugal pump," Transactions of the Chinese Society for Agricultural Machinery, Vol. 42(7), pp. 75-81. (in Chinese)
  8. Zhen Lu, Xide Lai, Xiang Zhang, Xiaoming Chen and Wei Song, 2013, "Numerical Simulation of Influence of Oil Tank with Different Throat Areas on Mirror-plate-pump Performance," Advanced Materials Research, Vol. 774-776, pp. 347-350. https://doi.org/10.4028/www.scientific.net/AMR.774-776.347
  9. Lu Zhen, Lai Xide, Zhang Xiang, Yang Shifu, Yang Peiping, "Influence of oil bath with different throat area on runner-pump performance," Water Power, Vol. 39(11), pp. 34-37. (in Chinese)