基于数据驱动的NO x 稳定性评价

doi:10.12096/j.2096-4528.pgt.21139

摘要/Abstract

摘要：

燃煤机组烟气NO _x 浓度的稳定性影响脱硝系统的运行性能。通过构建稳定性评估模型，实现对NO _x 浓度大数据分布的量化评价。构建了K均值聚类与3σ准则相结合的原始大数据清洗方法，通过滑动窗格法划分不同工况数据。基于最小二乘回归，建立了NO _x 浓度基准值模型。基于偏离程度，构建了偏离度函数和稳定系数函数，归一化处理后得到稳定性评分函数，从而实现全负荷NO _x 稳定性定量评价。利用该模型对某660 MW燃煤机组NO _x 数据进行评估，结果表明：NO _x 浓度分布整体集中度高，与负荷率呈正相关，变负荷工况稳定性得分比稳定工况低2.35%左右；将负荷率从50%提升至100%，稳定性得分提升了21.28%，说明所构建的模型能有效评价NO _x 分布的稳定性，为机组对标评价提供了依据。

关键词: 燃煤机组, NO _x 稳定性, 数据清洗, 最小二乘回归, 稳态检测

Abstract:

The stability of NO _x concentration in a coal-fired unit affects the operation performance of denitrification system. By constructing the stability evaluation model, the quantitative evaluation of the big data distribution of NO _x concentration was realized. The original big data cleaning method combining K-means clustering and 3σ criterion was constructed, and the data of different working conditions were divided by the sliding window method. A NO _x concentration reference value model was established based on the least-squares regression method. Based on the deviation degree, the deviation degree function and the stability coefficient function were constructed, and the stability scoring function was obtained after normalization, so as to realize the quantitative evaluation of the stability of full load NO _x . The model was used to evaluate NO _x data from a 660 MW coal-fired unit. The results show that the overall concentration of NO _x concentration distribution is high and positively correlated with load rate. The stability score of variable load condition is about 2.35% lower than that of stable condition. When the load rate is increased from 50% to 100%, the stability score is increased by 21.28%. It shows that the model can effectively evaluate the stability of NO _x_{distribution and provide a basis for benchmarking coal-fired units.}

Key words: coal-fired unit, NO _x stability, data cleaning, least-squares regression, steady state detection

中图分类号:

TK 09

彭家琪, 肖海平, 董竹雨, 孙保民, 白翎, 孙志春. 基于数据驱动的NO _x 稳定性评价[J]. 发电技术, 2023, 44(2): 163-170.

Jiaqi PENG, Haiping XIAO, Zhuyu DONG, Baomin SUN, Ling BAI, Zhichun SUN. Data-driven NO _x Stability Evaluation[J]. Power Generation Technology, 2023, 44(2): 163-170.

图/表 8

图1 数据清洗结果

Fig. 1 Data cleaning results

图2 NO x 浓度实际值与基准值对比

Fig. 2 Comparison of the actual value of NO x concentration with the reference value

图3 不同工况下NO x 浓度偏离度分布

Fig. 3 Distribution of NO x concentration deviation under different working conditions

表1 NO x 浓度偏离度在不同区间内占比

Tab. 1 NO x concentration deviation proportion in different intervals

工况	区间占比/%
工况	$δ < σ$	$δ < 2 σ$	$δ < 3 σ$
全负荷	78.34	94.10	98.29
稳负荷	78.49	94.10	98.29
升负荷	76.73	94.39	98.59
降负荷	77.33	93.67	98.14

表1 NO x 浓度偏离度在不同区间内占比

Tab. 1 NO x concentration deviation proportion in different intervals

工况	区间占比/%
工况	$δ < σ$	$δ < 2 σ$	$δ < 3 σ$
全负荷	78.34	94.10	98.29
稳负荷	78.49	94.10	98.29
升负荷	76.73	94.39	98.59
降负荷	77.33	93.67	98.14

图4 不同负荷稳定工况下NO x 浓度偏离度分布

Fig. 4 Distribution of NO x concentration deviation in stable conditions under different loads

表2 3种典型工况下NO x 浓度偏离度分布

Tab. 2 Distribution of NO x concentration deviation under three typical working conditions

工况	区间占比/%
工况	$δ < σ$	$δ < 2 σ$	$δ < 3 σ$
100%负荷	88.23	96.46	98.51
70%负荷	78.47	95.34	99.10
50%负荷	77.84	94.44	97.52

表2 3种典型工况下NO x 浓度偏离度分布

Tab. 2 Distribution of NO x concentration deviation under three typical working conditions

工况	区间占比/%
工况	$δ < σ$	$δ < 2 σ$	$δ < 3 σ$
100%负荷	88.23	96.46	98.51
70%负荷	78.47	95.34	99.10
50%负荷	77.84	94.44	97.52

表3 不同工况下NO x 稳定性分数

Tab. 3 NO x stability grade under different working conditions

工况	全负荷	稳负荷	升负荷	降负荷
得分	89.00	89.09	87.80	88.68

表4 不同负荷率稳负荷下NO x 稳定性分数

Tab. 4 NO x stability grade under steady load at different load rates

负荷率/%	100	70	50
得分	98.78	94.03	87.50

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