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Method for calculating power consumption of frequency-conversion circulating water pump

A technology of circulating water pump and calculation method, applied in pump testing, liquid variable capacity machinery, machine/engine, etc., can solve the problem of inability to accurately calculate the power consumption of variable frequency circulating water pump, and achieve error resolution, accurate data support, power consumption accurate effect

Inactive Publication Date: 2018-05-29
XUJI GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for calculating the power consumption of variable frequency circulating water pumps to solve the problem that the traditional calculation method cannot accurately calculate the power consumption of variable frequency circulating water pumps

Method used

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  • Method for calculating power consumption of frequency-conversion circulating water pump
  • Method for calculating power consumption of frequency-conversion circulating water pump
  • Method for calculating power consumption of frequency-conversion circulating water pump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] figure 1 The pump performance curve and pipeline performance curve of the circulating water pump shown, figure 2 Shown is the efficiency-flow curve of the pump at rated speed. Among them, the basic performance parameters of the circulating water pump mainly include flow Q, head H, power P, speed n, speed ratio α, and efficiency η.

[0034] The power consumption calculation method of a single variable frequency circulating water pump, the specific steps are as follows:

[0035] (1) Use origin software to fit the performance curve expression, pipeline performance curve expression and η-Q expression of the pump at the rated speed according to the curve diagram of the circulating water pump, as follows:

[0036] Pump performance curve expression: H=aQ 2 +bQ+c (1)

[0037] Pipeline performance curve expression: H=kQ 2 +H 0 (2)

[0038] η-Q expression: η=f(Q) (3)

[0039] Among them, H is the actual head at any speed of the variable frequency circulating water pump,...

Embodiment 2

[0062] Two identical circulating water pumps run in parallel after frequency conversion, and the speed ratios after frequency conversion are α 1 、α 2 , according to the analysis of the performance curve of a single variable frequency pump in Embodiment 1, the expression of the performance curve of the pump of two parallel variable frequency pumps can be drawn as:

[0063]

[0064] According to the parallel connection characteristics of the water pump, it can be known that: H=H 1 =H 2 , Q=Q 1 +Q 2 , the operating condition point formula of the frequency conversion after the circulating water pump is connected in parallel is as follows:

[0065]

[0066] Transform the above formula to get:

[0067]

[0068] In order to ensure that the above equations have solutions, the constraints are as follows:

[0069]

[0070] Among them, H is the actual head at any speed of the variable frequency circulating water pump, Q is the actual flow rate at any speed of the variab...

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Abstract

The invention relates to a method for calculating power consumption of a frequency-conversion circulating water pump. The method comprises the following steps that (1) a performance curve diagram of acirculating water pump is fitted to obtain a pump performance curve expression, a pipeline performance curve expression and an eta-Q expression under the rated rotating speed of the circulating waterpump; (2) according to derivation of relevant formulas, the parameters of a running working condition point of the frequency-conversion circulating water pump at any rotating speed are obtained; and(3) the efficiency of the circulating water pump after frequency conversion is obtained according to an equi-efficiency curve expression of the running working condition point of the circulating waterpump after frequency conversion, and power consumption of the frequency-conversion circulating water pump can be further obtained. According to the method for calculating power consumption of the frequency-conversion circulating water pump, programming is conducted through a Matlab binary method to obtain the related parameters of the running working condition point, and operating is simple; andmeanwhile, the calculating method avoids the error generated by calculating the power consumption of a frequency-conversion circulating water pump through a traditional calculating method, the calculating result is made to be more accurate, and then more accurate data support is provided for optimization of a cold end system of a thermal power plant.

Description

technical field [0001] The invention belongs to the technical field of energy saving in thermal power plants, and in particular relates to a calculation method for power consumption of a frequency conversion circulating water pump. Background technique [0002] The circulating water pump is the core equipment of the circulating water system of the thermal power plant and one of the important auxiliary equipment of the power plant. Its operation mode directly affects the vacuum of the condenser and the power consumption of the factory. The amount of circulating water affects the vacuum of the condenser and then the output of the unit. On the other hand, the circulating water pump itself also has a certain power consumption. How to achieve a balance between the two is an important part of cold-end optimization. [0003] In the prior art, adjusting the flow of circulating water by changing the speed of the circulating water pump is one of the commonly used methods at present, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B51/00
CPCF04B51/00
Inventor 刘志巍焦东东霍富强苏战辉赵书明王景丹袁翔
Owner XUJI GRP
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