Precomputation method of frequency conversion transformation working condition points of condensate pump for thermoelectric generating set

Abstract

The invention discloses a precomputation method of frequency conversion transformation working condition points of a condensate pump for a thermoelectric generating set. Before frequency conversion transformation is carried out on the condensate pump, evaluation of economy after frequency conversion transformation is necessary, and the working condition precomputation after frequency conversion transformation for the condensate pump is a chief premise of the work. The method provided by the invention is characterized by comprising the following steps: analyzing the variable speed operation working condition of the condensate pump by combining a variable speed operation balanced point computation method, and combining the related experiment under a working frequency state from the characteristics of a water level regulating valve of a deaerator to compute so as to obtain each coefficient of the balanced point computation method; and then combining the law of proportionality of a water pump to realize the quantitative computation of variable speed operation working condition point parameters of the condensate pump. On the basis, the energy conservation effect of the frequency conversion of the condensate pump can be evaluated, and a basis is provided for the transformation.

Description

technical field [0001] The invention relates to the field of thermal power generation, in particular to a method for pre-calculating the operating point of a condensed water pump of a thermal power generating set with frequency conversion transformation. Background technique [0002] In recent years, with the maturity of large-scale motor frequency conversion speed regulation technology, its cost performance has been continuously improved, which makes its large-scale application in the thermal power generation industry possible. Under the macro background of increasing energy conservation and emission reduction, coal-fired power units and gas-fired units of different capacity levels have begun to carry out frequency conversion transformation of major auxiliary equipment such as water pumps and fans, among which frequency conversion transformation of condensate pumps is the most common. The analysis and comparison of the selection of the operation adjustment mode of the conde...

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Problems solved by technology

[0003] Even so, some units still find that after the frequency conversion transformation of the condensate pump, the variable speed operation of the condensate pump is not economical at high load, and sometimes even consumes more energy than the power frequency operation. There is no energy-saving effect, and sometimes the unit cannot carry the rated load due to the motor current exceeding the limit

Due to the existence of deaerator in the condensate water system of thermal power generating set, there is a changing back pressure at the outlet of the condensate pump, which will reduce the speed regulation range of the condensate pump and also lead to a decline in energy saving effect. If this factor is not considered, it will Obtain overly optimistic calculation results

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