Thermal power plant boiler flue gas oxygen content soft measurement method

A technology for boiler flue gas and thermal power plant is applied in the field of soft measurement of oxygen content in boiler flue gas of thermal power plant, which can solve the problems of difficulty in adapting to changes in working conditions, low measurement accuracy, and single establishment.

Active Publication Date: 2019-03-19
NORTHEAST DIANLI UNIVERSITY
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Problems solved by technology

The soft-sensing method has the advantages of low cost, easy to use, and easy to maintain. However, most traditional methods use a single prediction model method, which has low measurement accuracy and is difficult to adapt to changes in working conditions.

Method used

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  • Thermal power plant boiler flue gas oxygen content soft measurement method
  • Thermal power plant boiler flue gas oxygen content soft measurement method
  • Thermal power plant boiler flue gas oxygen content soft measurement method

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Embodiment Construction

[0042] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0043] This embodiment provides a soft measurement method for the oxygen content of boiler flue gas in a thermal power plant, such as figure 1 As shown, the data set in it is shown in Table 1.

[0044] Table 1 Boiler data collection situation

[0045]

[0046] The method of this embodiment is specifically described as follows.

[0047] Step 1: Obtain the historical data of the boiler work in the thermal power plant, and obtain the boiler work historical data collection in, is the process parameter in the i-th sample, n is the number of process parameters, n=24, Y i is the flue gas oxygen content of the i-th sample, M is the number of samples in the data set, M=15...

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Abstract

The invention provides a thermal power plant boiler flue gas oxygen content soft measurement method, and relates to the technical field of thermal power plant power generation. The method comprises the steps of obtaining historical working data of a thermal power plant boiler; Normalization processing is carried out and then is divided into a control variable and a state variable. carrying out feature selection on the state variable data set by adopting a Ridge Regression method; and dividing the control variable data set and the state variable data set into a training set and a test set, training the DBN model by using the training set of the control variable and the state variable respectively to obtain a control variable model and a state variable model, and performing nonlinear combination on the control variable model and the state variable model to obtain a final flue gas oxygen content combined prediction model. The method can overcome the limitation of a traditional algorithm network structure, extracts the deep features of the data, has the advantages of high prediction precision, high convergence speed and the like, provides a basis for the application of an advanced control algorithm, and is beneficial to improving the boiler efficiency and reducing the boiler emission.

Description

technical field [0001] The invention relates to the technical field of power generation in thermal power plants, in particular to a soft measurement method for oxygen content in flue gas of a thermal power plant boiler. Background technique [0002] The oxygen content of flue gas is closely related to boiler combustion efficiency and exhaust gas emissions. When the oxygen content of the flue gas is too high, it will cause pollutants in the exhaust gas (NO x , SO x etc.) increase; and when the oxygen content of the flue gas is too low, it will lead to insufficient combustion of fuel and reduce the efficiency of the boiler. Accurate measurement of oxygen content in flue gas can help improve combustion quality and reduce coal consumption; it can help effectively control air-to-coal ratio and improve boiler combustion efficiency. [0003] The measurement methods of flue gas oxygen content mainly include direct measurement method and soft measurement method. The direct measur...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06N3/08
CPCG06N3/084G06F30/20Y02A50/20
Inventor 唐振浩李艳艳曹生现
Owner NORTHEAST DIANLI UNIVERSITY
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