燃煤电厂氮氧化物排放过程的LiNGAM原因分析

Tatsuki Saito, Koichi Fujiwara
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引用次数: 1

摘要

煤炭一直是世界范围内的重要能源;然而,它是氮氧化物(NOx)排放的最大来源,因为煤中的氮含量大于其他化石燃料。从空气污染控制的角度来看,在燃煤发电厂的运行中需要精确控制NOx排放。尽管已经对燃煤发电厂的NOx生成进行了理论分析,但很难准确预测实际发电厂中的NOx生成。NOx的产生受到多种因素的影响,如炉膛设计和运行条件,它们之间存在复杂的关系。因此,有必要确定影响实际燃煤发电厂NOx生成的重要运行因素。线性非高斯非循环模型(LiNGAM)是一种探索性的因果分析方法,它在没有任何变量之间因果关系的先验知识的情况下识别变量的因果排序及其连接强度。在本研究中,我们分析了使用LiNGAM从燃煤发电厂收集的实际运行数据,以确定NOx产生的因素。利用LiNGAM方法估算了工艺变量与NOx生成之间的因果关系,并推导了各变量对NOx生成的连接强度。分析结果与之前关于NOx生成机制的报告一致,如燃烧空气温度、炉膛特定侧的蒸汽温度和送风机的空气流速。此外,通过使用LiNGAM进行因果分析,我们发现蒸汽流速和炉膛压力是NOx产生的新的候选因素,而迄今为止尚未提出这一点。我们的分析结果将有助于减少未来燃煤发电厂的NOx排放。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Causal analysis of nitrogen oxides emissions process in coal-fired power plant with LiNGAM
Coal has been an important energy source worldwide; however, it is the largest source of nitrogen oxide (NOx) emissions because the amount of nitrogen in coal is larger than that of other fossil fuels. Precise control of NOx emissions is required in operations of coal-fired power plants from the viewpoint of air pollution control. Although theoretical analyses of NOx generation from a coal-fired power plant have been conducted, it is difficult to precisely predict NOx generation in an actual plant. NOx generation is affected by various factors, such as furnace design and operating conditions, and there are complicated relationships among them. Thus, it is necessary to identify important operating factors that affect NOx generation in actual coal-fired power plants. A linear non-Gaussian acyclic model (LiNGAM) is an exploratory causal analysis method that identifies a causal ordering of variables and their connection strengths without any prior knowledge of causal relationships among variables. In this study, we analyzed real operation data collected from a coal-fired power plant using LiNGAM to identify factors of NOx generation. The causal relationship between process variables and NOx generation was estimated by means of LiNGAM, and the connectional strengths of the variables on NOx generation were derived. The analysis results agreed with previous reports on NOx generation mechanisms, such as combustion air temperature, steam temperature on a specific side of the furnace, and air flow rate of forced draft fans. In addition, we found the steam flow rate and the furnace pressure as new candidate factors of NOx generation through causal analysis using LiNGAM, which heretofore has not been suggested. Our analysis result should contribute to reducing NOx emissions from coal-fired power plants in the future.
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