Method for carrying out early warning of abnormal superheated steam temperature and fault diagnosis on direct current megawatt unit

A superheated steam temperature and fault diagnosis technology, applied in electrical testing/monitoring, etc., can solve problems such as early warning of abnormal superheated steam temperature, large fluctuations in final steam temperature, etc.

Inactive Publication Date: 2012-01-25
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a superheated steam temperature abnormal early warning and fault diagnosis method for the proble

Method used

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  • Method for carrying out early warning of abnormal superheated steam temperature and fault diagnosis on direct current megawatt unit
  • Method for carrying out early warning of abnormal superheated steam temperature and fault diagnosis on direct current megawatt unit
  • Method for carrying out early warning of abnormal superheated steam temperature and fault diagnosis on direct current megawatt unit

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with the accompanying drawings. The embodiments of the present invention are used to explain the present invention, but not to limit the present invention.

[0048] The steps of the superheated steam temperature abnormal early warning and fault diagnosis method of DC million units are as follows:

[0049] 1) Divide working conditions according to unit load, select 10% of full load as the load section selection rule, and determine 6 typical working conditions from 45% to 100% of full load; typical working conditions of million units can be divided as follows: 450MW ~550MW, 550MW~650MW, 650MW~750MW, 750MW~850MW, 850MW~950MW and above 950MW.

[0050] 2) Read the data of key variables during normal operation under each load condition from the DCS historical database as the corresponding training samples ; The key variable is: superheated steam temperature prediction model variable and fault diagnos...

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Abstract

The invention discloses a method for carrying out early warning of an abnormal superheated steam temperature and fault diagnosis on a direct current megawatt unit. The method comprises the following steps of: dividing working conditions; identifying parameters of a superheated steam temperature forecasting model under typical working conditions; carrying out on-line forecasting on a superheated steam temperature tendency; and carrying out fault diagnosis. A diagnostic message provided by the method faces a field centralized control operator; and the operator can obtain contribution information of each variable to fluctuation of the steam temperature by clicking in an early warning state, so that the operator can rapidly determine a fault reason and timely treat a field fault. Due to the adoption of the method, the superheated steam temperature tendency can be forecasted a plurality of minutes early; and the provided diagnostic message faces the field centralized control operator and the operator can obtain the contribution information of each variable to fluctuation of the steam temperature by clicking in the early warning state, so that the operator can rapidly determine the fault reason and timely treat the field fault. The invention provides the rapid, simple and convenient method for safe and stable operation of the large-scale direct current unit.

Description

technical field [0001] The invention relates to the field of automatic control of a large-scale thermal power production process, in particular to early warning and fault diagnosis of abnormal superheated steam temperature of a DC million unit unit. Background technique [0002] Under the general environment of energy conservation, emission reduction, and improvement of power generation efficiency, ultra-supercritical direct current million units have become the mainstream trend of thermal power plant construction. After nearly two years of operation, the power plant has gradually mastered the operation technology of the 1000MW ultra-supercritical unit, but the problem of large fluctuations in boiler steam temperature still exists, and the phenomenon of tube bursts after the 1000MW unit is put into operation occurs from time to time. The reason is that since there is no steam drum link, the heating, evaporation and superheated steam of the feed water of the ultra-supercritic...

Claims

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Application Information

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IPC IPC(8): G05B23/02
Inventor 陈小强许仙珍
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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