Coal-fired boiler NOX soft measurement method based on whale algorithm for optimizing long and short term memory network

A long-short-term memory technology for coal-fired boilers, applied in design optimization/simulation, constraint-based CAD, multi-objective optimization, etc., can solve problems such as difficult direct measurement and difficult maintenance, and achieve good generalization performance and effective measurement accuracy Enhanced effect

Pending Publication Date: 2021-11-09
XIAN UNIV OF SCI & TECH
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Problems solved by technology

NO X The traditional measurement method has problems such as difficulty in direct measur

Method used

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  • Coal-fired boiler NOX soft measurement method based on whale algorithm for optimizing long and short term memory network
  • Coal-fired boiler NOX soft measurement method based on whale algorithm for optimizing long and short term memory network
  • Coal-fired boiler NOX soft measurement method based on whale algorithm for optimizing long and short term memory network

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Embodiment

[0156] In the boiler combustion system, the influence of NO X The unit variables generated by the content can be roughly divided into the following three categories:

[0157] The first category, variables that cannot be measured and adjusted, such as the model of the boiler and burner, the structure of the boiler, etc.;

[0158] The second category is variables that can be measured but cannot be adjusted, such as primary air temperature, secondary air temperature, and flue gas temperature;

[0159] The third category is variables that can be measured and adjusted, such as coal supply, primary air volume, and secondary air volume.

[0160] After principal component analysis, 17 easy-to-measure auxiliary variables are obtained. Some of these auxiliary variables are non-adjustable, and some are adjustable. This section selects these adjustable variables to optimize combustion. The selected The quantities are: the coal feeding amount of the coal feeder (4 units), the primary air...

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Abstract

The invention discloses a coal-fired boiler NOX soft measurement method based on a whale algorithm for optimizing a long-short term memory network. The method comprises the following steps: analyzing and selecting related auxiliary variables according to an NOX generation mechanism and a boiler combustion process; extracting data corresponding to the auxiliary variables from a DCS (Distributed Control System) of the coal-fired power plant and carrying out data preprocessing; carrying out secondary screening on the auxiliary variables by adopting a principal component analysis method, and solving each principal component and the contribution rate thereof; adding a whale optimization algorithm, and obtaining a proper hyper-parameter value through optimization; substituting the hyper-parameter values into the network, and constructing a coal-fired power plant boiler NOX soft measurement model of the whale algorithm optimized long-short term memory neural network; taking the obtained data of the auxiliary variables as input, obtaining a soft measurement value of the NOX content through a coal-fired power plant boiler NOX soft measurement model, and assisting hard measurement equipment by establishing the soft measurement model. The defects of traditional equipment are overcome, and the economic cost of production monitoring is reduced.

Description

technical field [0001] The invention relates to the technical field of coal-fired power plants, specifically a coal-fired boiler NO X Soft measurement method. Background technique [0002] At present, tail flue gas denitrification technology has been widely used in coal-fired power plants. It uses a series of technologies and adsorption methods at the end of the flue gas flow channel to treat a large amount of NO produced in the boiler. X Perform a revertive transformation. Most coal-fired units in my country use SCR denitrification technology to treat the flue gas generated during the combustion process, that is, under the action of catalytic substances, the NO in the tail channel X React with some reducing substances, NO X reduced to H 2 O and N 2 , so that the NO emitted into the air X The content is reduced, thereby protecting the atmospheric environment. SCR denitrification technology needs to be based on the NOx in the flue X content, determine the required re...

Claims

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Application Information

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IPC IPC(8): G06F30/27G06N3/00G06N3/04G06N3/08G06F111/04G06F111/06G06F111/10
CPCG06F30/27G06N3/006G06N3/084G06F2111/10G06F2111/04G06F2111/06G06N3/044Y04S10/50
Inventor 汪梅李远成张昭昭许犇董立红王丹阳
Owner XIAN UNIV OF SCI & TECH
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