Prediction of NO<sub><i>x</i></sub> Concentration at the SCR Inlet Based on Improved LSTM with Attention Mechanism

ZHAO Xudong; LI Jun; WANG Lin; GAO Lin; GONG Linjuan; GAO Yixuan; LIANG Yongji; YANG Damao; WANG Wenyu

doi:10.19805/j.cnki.jcspe.2025.250403

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Prediction of NO_x Concentration at the SCR Inlet Based on Improved LSTM with Attention Mechanism

更新时间：2026-01-23

- Prediction of NO_x Concentration at the SCR Inlet Based on Improved LSTM with Attention Mechanism
- Chinese Journal of Power Engineering Vol. 45, Issue 12, Pages: 2044-2055(2025)
- 作者机构：
  
  1. 西安热工研究院有限公司,陕西,西安,710054
  2. 高效灵活煤电及碳捕集利用封存全国重点实验室,北京,100031
  3. 北京交通大学(威海) 经济管理学院,山东,威海,264401
  4. 华能铜川照金煤电有限公司,陕西,铜川,727100
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2025.250403
  CLC：
- Published Online：16 December 2025，
  
  Published：16 December 2025
- 稿件说明：
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赵旭东,李军,王林,高林,弓林娟,高艺轩,梁永吉,杨大锚,王文毓. 基于改进LSTM与注意力机制的SCR入口NO_x生成浓度预测动力工程学报, 2025, 45(12): 2044-2055 https://doi.

org/10.19805/j.cnki.jcspe.2025.250403
赵旭东,李军,王林,高林,弓林娟,高艺轩,梁永吉,杨大锚,王文毓. 基于改进LSTM与注意力机制的SCR入口NO_x生成浓度预测动力工程学报, 2025, 45(12): 2044-2055 https://doi. DOI： 10.19805/j.cnki.jcspe.2025.250403.

org/10.19805/j.cnki.jcspe.2025.250403 DOI：

摘要

为解决火电厂燃煤锅炉NO

生成机理复杂

选择性催化还原(SCR)系统喷氨导致的难以及时、精准调控的问题

提出了一种基于改进的长短时记忆网络(LSTM)与注意力机制的SCR入口NO

生成浓度预测方法。首先

通过锅炉燃烧NO

生成机理分析确定初始特征变量集

在原始运行数据经过预处理后

利用最大信息系数确定各变量的延迟时间

并构建时滞补偿数据集;其次

基于灰色关联度分析(GRA)对影响NO

生成的关键变量进行排序

从而实现特征选择。最后

提出了一种融合改进LSTM与注意力机制的新型时间序列预测模型ADS-Forecaster

采用双路径特征编码及自注意力融合解码

实现NO

生成浓度实时预测。基于某600 MW亚临界燃煤机组运行数据的实验结果表明:与基准模型RNN、LSTM及xLSTM相比

ADS-Forecaster模型在泛化能力和预测精度方面具有优势。

Abstract

To address the issues of complex NO

generation mechanisms in coal-fired boilers of thermal power plants

and the difficulty in timely and precise regulation caused by ammonia injection into selective catalytic reduction (SCR) systems

a prediction method for NO

generation concentration at the SCR system inlet based on an improved long short-term memory network (LSTM) and attention mechanism was proposed. Firstly

the initial feature variable set was determined through mechanistic analysis of NO

generation during boiler combustion. Following the preprocessing of the raw operational data

the maximum information coefficient was used to ascertain

the delay time for each variable

thereby constructing a time-lag compensated data set. Secondly

based on grey relational analysis (GRA)

the key variables affecting NO

formation were ranked to achieve feature selection. Finally

a novel time-series forecasting model ADS-Forecaster integrated the improved LSTM with an attention mechanism was proposed

which used dual-path feature encoder and self-attention fusion decoder to realize real-time prediction of NO

concentration. The test results based on operational data from a 600 MW subcritical coal-fired unit show that compared with benchmark models (RNN

LSTM and xLSTM)

ADS-Forecaster model achieves superior generalization capability and prediction accuracy.

关键词

Keywords

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Prediction of NOx Concentration at the SCR Inlet Based on Improved LSTM with Attention Mechanism

DOI：10.19805/j.cnki.jcspe.2025.250403

摘要

Abstract

关键词

Keywords

references

Prediction of NO_x Concentration at the SCR Inlet Based on Improved LSTM with Attention Mechanism