| Currently,the serious situation, including power plants separating from power grids and electricity price not keeping pace with coal price, is great changllege for every power plants. So, decreasing generating cost has become the essential ability of power enterprise for making longer survivorship and accelerating development. As one of most important auxiliaries in power plants, coagulate pump is in state of long-term operation with constant speed, the throttling control mode leads poor economical efficiency. As a result, in order to decreasing the power-consumpted ratio of auxiliaries, frequency conversion retrofit coagulate pump has become an efficient mean for power enterprises.On the basis of summarizing and analyzing frequency conversion alteration cases of coagulate pump in domestic power plants, the retrofit scheme of"one driving two"with high voltage frequency conversion techonolgy is determined. Frequency converter parameters are specified by load range, operational reliability and matching ability. For the existing prolems after retrofit, many aspects including failure alarm conditions and logic control in frequency conversion control system are setted or modified, and the key points of technical innovation are optimized or updated, which guaranting safe and stable operation. Economic analysis shows that by comparison with energy consumption before alteration, energy saving ratio is 49.59% with frequency conversion alteration, and the retrofitted coagulate pump operates stably and reliably with a remarkable energy-saving effect. |
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