Method for monitoring flow meter faults of turbine system
A technology for fault monitoring and system flow, which is applied in liquid/fluid solid measurement, measuring devices, testing/calibration devices, etc. It can solve the problem of installing multiple flow meters, lack of effective fault monitoring means, complicated installation and disassembly of flow meters, etc. problem, to achieve the effect that the method is simple and feasible
Active Publication Date: 2014-03-26
TSINGHUA UNIV
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Problems solved by technology
However, due to the following two reasons, there are difficulties in fault monitoring of orifice plate or nozzle flowmeters: 1) The flowmeter requires a large installation space, and it is usually impossible to install multiple flowmeters at the same position in the steam turbine system; therefore, it cannot be used The method of conventional measurement equipment redundancy is used for flowmeter fault monitoring; 2) The installation and disassembly process of the flowmeter is complicated, and it is difficult to carry out regular calibration and verification
Therefore, there is still a lack of effective fault monitoring methods for flowmeters used for on-line measurement of steam turbines.
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Embodiment 1
[0044] The present invention will be described below by taking a steam turbine high-pressure feed water heater, feed water pump and deaerator system as an example. The equipment included in this embodiment is: three high-pressure feedwater heaters, namely #1 high-pressure feedwater heater, #2 high-pressure feedwater heater and #3 high-pressure feedwater heater; one feedwater pump; one deaerator.
[0045] The pressure, temperature and flow measurement parameters in the system are shown in Table 1. The measured parameters are recorded as X in turn 1 ,X 2 ,...X 21 . Wherein, the number of measurement parameters is 21.
[0046] Table 1. Measurement parameters, measurement values, measurement uncertainties and coordination values
[0047]
[0048]
[0049] The unmeasured parameters included in the system are shown in Table 2. The unmeasured parameters are recorded as Y in turn 1 ,Y 2 ,...Y 8 . Among them, the number of unmeasured parameters is 8.
[0050] Table 2. ...
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The invention provides a method for monitoring flow meter faults of a turbine system and belongs to the field of online monitoring of a turbine. A data coordination method is adopted by the method so that broken-down flow meters can be monitored and identified. The method specifically comprises the steps that (1) data coordination calculation is conducted through steady-state condition measured data according to the uncertainty of measured values of measured parameters and a system constraint equation; (2) the minimum objective function value of data coordination is compared with a fault detection threshold value, whether the flow meters break down or not is judged; (3) if it is detected that the flow meters break down, fault identification is conducted on the flow meters one by one, the measured parameters corresponding to the flow meters serve as non-measured parameters, and the minimum objective function value of data coordination is calculated again; the new minimum objective function value is compared with the fault detection threshold value, so that the broken-down flow meter is identified. According to the method for monitoring the flow meter faults of the turbine system, redundant flow measurement information in the turbine system can be effectively used for detecting and identifying the flow meter faults and the method has the advantages of being easy to achieve, efficient and low in cost.
Description
technical field [0001] The invention relates to a method for monitoring a failure of a steam turbine system flowmeter, belonging to the field of on-line monitoring of steam turbines. Background technique [0002] Flow measurement is one of the most important parameters for online measurement of steam turbines. At present, the on-line flow measurement of steam turbine usually adopts orifice plate or nozzle flow meter. During the operation of the steam turbine system, due to the erosion and corrosion of the working fluid, the flowmeter may fail. However, due to the following two reasons, there are difficulties in fault monitoring of orifice plate or nozzle flowmeters: 1) The flowmeter requires a large installation space, and it is usually impossible to install multiple flowmeters at the same position in the steam turbine system; therefore, it cannot be used The method of conventional measurement equipment redundancy is used for flowmeter fault monitoring; 2) The installation...
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IPC IPC(8): G01F25/00
Inventor 李政蒋晓隆刘培仲晓波朱泓逻
Owner TSINGHUA UNIV
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