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Soft measuring method for power boiler breeze concentration mass flow

A technology for mass flow and power station boilers, applied in mass flow measurement devices, indirect mass flow meters, instruments, etc., can solve problems such as low accuracy, and achieve the effect of improving measurement accuracy

Inactive Publication Date: 2009-06-24
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

[0007] The present invention aims at the problem of low precision in the measurement of pulverized coal concentration and mass flow of the existing power station boilers, and proposes a soft measurement method for pulverized coal concentration and mass flow of power station boilers. Using fuzzy mathematics, a multi-model weighted average method based on decomposition and synthesis is proposed. The solid-phase mass flow nonlinear soft-sensing model can effectively reduce the influence of the flow pattern on the measurement accuracy of the multiphase flow meter and improve the concentration measurement accuracy; the soft-sensing model based on electrostatic sensing technology and fuzzy rules can Extended to the multiphase flow parameter measurement of other detection principles, the system structure is simple and easy to implement

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  • Soft measuring method for power boiler breeze concentration mass flow
  • Soft measuring method for power boiler breeze concentration mass flow
  • Soft measuring method for power boiler breeze concentration mass flow

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Embodiment Construction

[0022] Considering that in the space sensitive field of the electrostatic sensor, different particle distributions correspond to different sensor output signals, the change of the flow pattern in the flow process and the flow pattern can be identified and introduced online, and the model can be corrected online, which can reduce the flow pattern and flow pattern. The influence of sensor nonlinear sensing mechanism on measurement results to improve the measurement accuracy of electrostatic sensors. Obtain the measurement data through the electrostatic sensor, after noise reduction and filtering, use the dynamic time window model to smooth the measurement data, then extract the characteristic information of the output signal, consider the connection and difference between the data groups, and establish different clusters The soft sensor model in the center uses the fuzzy clustering algorithm to divide the input data into spatial partitions, and uses the radial basis function (RBF...

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Abstract

The invention relates to a mass flux soft measuring method for measuring the concentration of coal dust in a station boiler. The method provides a decomposition-and-synthesis-based multi-model weighted average solid-phase mass flux nonlinearity soft-measuring model by utilizing the fuzzy mathematics. The method can effectively reduce the influence of flow pattern on the measuring accuracy of a multiphase flow flowmeter, thereby improving the precision of concentration measurement. The soft measuring model based on the electrostatic sensing technology and the fuzzy rules can be applied to multiphase flow parameters measurement based on different detection principles. The system has the advantages of simple structure and easy realization.

Description

technical field [0001] The invention relates to boiler measurement and signal processing, in particular to a method for soft measurement of pulverized coal concentration and mass flow in power plant boilers. Background technique [0002] The dynamic monitoring of pulverized coal concentration during the combustion process of power plant boiler is very important for the safe and normal operation of the boiler. Air powder mixture belongs to gas-solid two-phase flow. Mass flow rate is an important flow parameter to describe the flow process of gas-solid two-phase flow. The non-contact measurement methods of gas-solid two-phase flow mainly include thermal method, electrical method, attenuation method, tomography method and resonance method. [0003] Electrostatic method is a kind of electrical method. The basic principle of its measurement is that during the crushing process and transportation process of coal, the collision, friction and separation between coal powder particl...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/86G06K9/62G06N3/02
Inventor 成贵学潘卫国曹绛敏王文欢
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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