Method and device for judging state of negative pressure system

A system status and judging device technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as difficult to obtain the real situation, achieve reliable analysis, accurate classification, and reduce misdiagnosis rate.

Inactive Publication Date: 2014-01-22
STATE GRID CORP OF CHINA +1
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  • Abstract
  • Description
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Problems solved by technology

If only a single evaluation index is used to analyze the state of the negative pressure system, it is bound to be difficult to obtain a complete and true situation of the entire system. For the entire negative pressure system, the impact may be negligible

Method used

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  • Method and device for judging state of negative pressure system
  • Method and device for judging state of negative pressure system
  • Method and device for judging state of negative pressure system

Examples

Experimental program
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specific Embodiment

[0122] 1. Water-cooled unit

[0123] The analysis and evaluation object is: the operation status of the water-cooled condenser of a 300MW unit in a thermal power plant is: the actual vacuum value is 98% of the vacuum design value, that is, m=H 实际 / H 设计 =0.98, condensed water oxygen content C a =25μg, condensed water subcooling degree δ c The temperature is 1.8℃, the tightness test result is X=300Pa / min, the amount of leaked air is 31.6kg / h, and the condenser end difference δ t =8°C.

[0124] The similarity between each element is obtained by the binary comparison method, and the single-factor fuzzy similarity matrix R(s) for each factor is constructed, and then the fuzzy similarity matrix of all factors is obtained:

[0125] R = 1 0.92 0.70 0.69 0.51 ...

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Abstract

The invention provides a method and device for judging the state of a negative pressure system. The method includes the steps of setting up membership functions of all evaluation indexes of a unit to be judged, generating an evaluation rating set, obtaining running state values of all the evaluation indexes of the unit to be judged, setting up fuzzy similar matrixes of integrative factors of the unit to be judged according to a set weight set, the evaluation rating set and the running state values, generating fuzzy equivalent matrixes of the fuzzy similar matrixes of the integrative factors through square calculation, classifying the fuzzy equivalent matrixes according to set cutting values, and generating a judgment result for the state of the negative pressure system of the unit to be judged. According to the method and the device, the health condition of the negative pressure system of the unit can be accurately analyzed and judged, the method and the device are suitable for both water-cooled units and air-cooled units, accurate classification can be conducted on complex equipment, no omitting occurs, reliable analysis is provided for related personnel, and therefore work efficiency of a whole power plant is improved.

Description

technical field [0001] The invention belongs to the detection field of a negative pressure side system of a thermal power plant, and in particular relates to a method and a device for judging the state of a negative pressure system. Background technique [0002] The negative pressure side equipment represented by the condenser is an important auxiliary equipment of the thermal power plant. Its operating performance has a great influence on the cycle thermal efficiency of the steam turbine unit. The deterioration of the working state of the negative pressure equipment during operation will directly cause the heat consumption of the steam turbine, steam For example, the vacuum of a 200MW unit condenser decreases by 1%, resulting in a 0.029% increase in heat consumption and a reduction in power generation of about 58kW, while a 1% decrease in the condenser vacuum of a 600MW unit increases heat consumption by 0.05% and reduces power generation About 306kW. According to regulati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 梅隆黄葆华陈晓峰刘双白吕炜孙曰泰左川
Owner STATE GRID CORP OF CHINA
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