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Denitration device ammonia spraying accurate control system and method based on accurate concentration prediction

A concentration prediction and control system technology, applied in the general control system, control/regulation system, program control, etc., can solve problems such as sulfate air preheater, catalyst blockage, ammonia escape, and the amount of ammonia injection cannot be accurately controlled, etc., to achieve Improve economy and stability, and overcome the effect of large inertia

Active Publication Date: 2021-09-24
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large hysteresis of NOx concentration measurement at the inlet of the denitrification system, the difficulty of accurate measurement, and the strong nonlinearity of the system, the CFB boiler using SNCR and SCR coupled denitrification technology has the problem that the amount of ammonia injection cannot be precisely controlled. , will cause the NOx concentration to exceed the emission standard; when the amount of ammonia injected is too much, ammonia escape will occur, polluting the atmosphere, and sulfate will be generated, which will lead to serious blockage of the air preheater and catalyst, which will affect the safety of equipment

Method used

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  • Denitration device ammonia spraying accurate control system and method based on accurate concentration prediction
  • Denitration device ammonia spraying accurate control system and method based on accurate concentration prediction
  • Denitration device ammonia spraying accurate control system and method based on accurate concentration prediction

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Embodiment 1

[0058] refer to figure 1 , figure 2 , the present invention aims at the characteristics of the large-scale variable load operation of the CFB boiler unit, and proposes a method based on the inlet NO x The ammonia injection precision control system of the denitrification device with accurate concentration prediction can precisely control the ammonia injection device; the ammonia injection precision control system includes the power station information system, the NOx concentration prediction model at the entrance of the denitration device, the multi-model predictive control module, and the denitrification device control module. object;

[0059] The power station information system includes a power plant OPC server and DCS control equipment. When the present invention controls the unit in real time, the NOx concentration prediction model at the inlet of the denitration device communicates with the OPC server of the power plant, and transmits the DCS data to the NOx concentrati...

Embodiment 2

[0105] Taking the actual control process and short-term and long-term control effects of a certain 220t / h circulating fluidized bed pulverized coal furnace as an example, describe the content of the present invention in detail:

[0106] (1) Select 4 coal feed rates, 2 primary air volumes, 2 secondary air volumes, 10 hearth temperatures, 2 furnace outlet flue temperatures, 1 main steam flow rate, and 1 flue gas O 2 A total of 22 input characteristic variables of volume percentage are clustered based on the operating coal supply data of the last two months, and the cluster centers are determined to be 12.1t / h, 18.0t / h, and 26.0t / h; input after data and processing In the LSTM model, the prediction time step is selected as 14, the backtracking time step is 30, 2 hidden layers, and 128 hidden layer nodes in each layer; the LSTM model is established with this hyperparameter configuration to predict the NOx concentration at the inlet of the denitrification device;

[0107] (2) M=1 of...

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Abstract

The invention relates to an accurate ammonia spraying control system and method for a denitration device based on accurate concentration prediction. The accurate ammonia spraying control system comprises a power station information system, a denitration device inlet NOx concentration prediction model, a multi-model prediction control module and a denitration device control object. Accurate feedforward is provided for control over the ammonia injection amount of the denitration device by predicting the NOx concentration of an inlet of the denitration device in advance, meanwhile, a multi-model prediction control module under the variable load working condition is established, accurate control over the ammonia injection amount of the denitration device is achieved, and defects of large delay, large inertia and strong nonlinearity of a denitration system are overcome; under the large-range variable load working condition, economical efficiency and stability of ammonia spraying amount control of the denitration device are greatly improved under the condition that it is guaranteed that the NOx concentration of an outlet reaches the standard.

Description

technical field [0001] The invention belongs to the technical field of optimization of ammonia injection devices in denitrification systems, and in particular relates to a precise control system and method for ammonia injection in denitrification devices based on accurate concentration prediction. Background technique [0002] Coal combustion produces pollutants such as nitrogen oxides, sulfur dioxide, and smoke, which are harmful to the atmospheric environment and human health. [0003] SNCR / SCR coupling denitrification technology is a joint process developed by combining SNCR technology and SCR technology, which has the characteristics of low investment cost of SNCR technology and high denitration efficiency of SCR technology. However, due to the large hysteresis of NOx concentration measurement at the inlet of the denitrification system, the difficulty of accurate measurement, and the strong nonlinearity of the system, the CFB boiler using SNCR and SCR coupled denitrifica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/418
CPCG05B19/41865G05B2219/33273Y02P90/02
Inventor 高翔郑成航谭畅张涌新周灿吴卫红翁卫国杨洋张悠姚龙超刘少俊李钦武孙德山
Owner ZHEJIANG UNIV
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