| Centrifugal pump has been popular used in every work of life as a general water conservancy machine. Every year, the power consumption of pumps accounts for 20% of total power consumption in China, so the improvement of pump efficiency impact every work of life.In large power plant, multistage centrifugal pump used to be chosen as feed water pump, and considered enough margins. In thermal power plants, feed water pump is the biggest power consumption equipment in auxiliaries, and which performance parameter and power consumption is always the emphasis focused by power plants.CHTC5/6SP Drum multistage centrifugal pump has been used in Zhangjiakou plant, in actual operation, speed of centrifugal pump used to lower than rated speed and out of best design condition of pump mostly.And the inlet pressure of feed water pump turbine does not get the rated pressure, especially after steam path retrofit; after retrofit, the pressure of extraction which is the steam resource of feed water pump is lower, in order to meet the requirement of feed water quantity increases in actual operation, the valve opening need to be larger to increase the quantity of inlet steam, even in full load condition; above conditions will threaten the unit power and safety.Aim at the problem of Zhangjiakou power plant, the improvements has been implemented to improve the efficiency, stability and safety of feed water pump, for example: redesign the steam path for guide vane diffusion zone of feed water pump, to improve the performance parameter by grinding the guide vane and the impeller passage; adjust the space among seal ring, diffusor sleeve and balance equipment,and dressing steam path to reduce losses, improve the vibration measurement, optimize the operation and overhaul and etc.After completely solve the lack of water after steam path retrofit, feed water pump will work in peak efficiency at full load condition; meanwhile, due to the increase in energy efficiency,it can play the role of energy-saving. |
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