Frequency converter applied in power plant on the condensate pump energy saving

In thermal power plant, the unit must be equipped with the pumps mainly include boiler feed pump, circulating pump and the condensate pump, followed by water pump, low-pressure heater drain water pump, heat pump, cooling water pump, mortar pump, pump shaft seal, in addition to salt water pump, fresh water pump, filter backwashing pump, water pumps, industrial pumps, fire pumps of life, and supply water pumps, etc. These pumps number, the total installed capacity of large: 50 mw thermal power unit's main form a complete set of the pump with a total installed capacity of 6430 kw, accounting for 12.86% of the unit capacity; 100 mw unit is 10480 kw, accounting for 10.48%; 200 mw unit is 200 kw, accounted for 7.73%. Main form a complete set of the water pump of 100 mw of total power consumption accounts for about 70% of the total plant power consumption. Thus, the pump does is an auxiliary power consumption is the largest coal-fired power plants. Therefore, improving the efficiency of the pump, reduce the power consumption of the pump to reduce the service-power consumption rate has the vital significance. Foreign power of fan and water pump have add speed regulating device, and at present in our country in addition to a small amount of feed water pump driven by steam turbine in the power plant, hydraulic coupler and a two-speed motor, other fan and water pump are mostly driven by constant speed. This kind of pump and constant speed drive, the outlet valve, inlet throttle adjusting flow fan is used, there are severe throttling loss. Especially in the run time of varying the unit's load, due to the operation of the fan and water pump from efficient point, make the efficiency is greatly reduced, the result is in vain to waste a lot of energy, have reached the point where they must change.