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

A technology for condensate pumps and generator sets, which is applied to machines/engines, pump control, mechanical equipment, etc., and can solve problems such as motor current exceeding the limit, uneconomical variable speed operation of condensate pumps, and reduced energy-saving effects.

Inactive Publication Date: 2011-09-28
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +2
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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 exceed

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

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Embodiment Construction

[0040] The rated speed of the condensate pump motor of a 600MW subcritical thermal power unit is 1490r / min, ΔH=0.3MPa, Q md =1511t / h, P cyd =0.6MPa, according to the test results under the power frequency state and the design data of the main and auxiliary regulating valves, ΔP can be calculated m =0.401MPa, ΔP n =1.262MPa, ΔP l =0.863MPa, thus formula (4) can be determined as: P 0 = 5.537 × 10 - 7 Q m 2 + 3.971 × 10 - 4 Q m + 0.3 .

[0041] In the case that the condensate user has no restrictions on the outlet pressure of the condensate pump, the relationship between the speed, outlet pressure and load of the condensate pump after it is changed to variable speed operation is ...

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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...

Claims

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Application Information

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IPC IPC(8): F04B49/00
Inventor 张宝童小忠吴文健樊印龙
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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