Current status of fault diagnosis for CHP units in integrated energy systems

doi:10.3969/j.issn.2097-0706.2024.08.009

Abstract

Abstract:

As an important component of an integrated energy system， a CHP unit not only provides electric and thermal power，but also lays a foundation for renewable energy consumption. The fan and coal mill are significant devices for a cogeneration unit and play vital roles in its operation. In the research on fault diagnosis technologies，faults in fans and coal mills are summarized，and subsequently， based on artificial intelligence algorithms，the fault diagnosis technologies are categorized into three technical approaches： machine learning， deep learning， and hybrid models. The development trends and core issues of each technology are analysed. Finally， the prospects of fault diagnosis technologies applying in integrated energy systems are discussed.

Key words: integrated energy system, CHP unit, machine learning, hybrid model, deep learning, fault warning, ccommodation of renewable energy, coal mill

CLC Number:

TK01：TM621

DENG Zhenyu, WANG Rukang, XU Gang, YUN Kun, WANG Ying. Current status of fault diagnosis for CHP units in integrated energy systems[J]. Integrated Intelligent Energy, 2024, 46(8): 67-76.

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故障类型	影响后果
磨煤机落煤管堵塞	影响磨煤机的出力，进而影响锅炉内部的燃烧与运行
磨煤机入口风压增高	提高一次风压，导致一次风机的耗电量增大
磨煤机振动异常	导致煤粉泄漏，严重影响制粉系统和锅炉的安全稳定运行
磨煤机石子煤排量异常	对磨煤机的干燥出力、碾磨出力、通风出力等造成影响
磨煤机内部着火	磨煤机出口风粉混合物温度会急剧上升、同时磨煤机进出口压差会下降
磨煤机堵煤	堵煤的初期，磨煤机的电流、出口风粉混合物温度、进出口差压等参数都会发生变化，磨煤机堵煤会导致磨煤机出力严重下降

类别		基本原理
容积式	往复式	活塞通过曲柄连杆在气缸内往复运动，使气体的容积减小，压力增大
容积式	回转式	例如罗茨风机，通过2个转子逆时针的旋转，把气体吸入并压缩送入排气管道中
透平式	离心式	在离心力作用下，进入旋转的叶片的气体被压缩并抛送至叶轮外缘
	轴流式	沿轴向进入旋转叶片通道的气体，在与叶片的相互作用下，压缩后沿轴向排出
	混流式	介于轴流式和离心式之间，气体通过与主轴成一定角度的方向进入叶片通道
	横流式	气体横穿进入旋转叶道，受到叶片的作用而使压力升高
喷射式		经过管道中的喷嘴时，风机速度增加压力减小，低速气体在管中进行输送

故障类型	可能原因
轴承振动故障	底脚螺丝松动或混凝土基础损坏、风道损坏、轴承损坏、轴弯曲、转轴磨损、叶片磨损或积灰、叶片与外壳发生碰撞、引风机失速等
轴承温度异常	风机振动过大、风机过负荷运行时间长、润滑油系统冷却不到位、烟气温度过高、轴承冷却风机故障及备用冷却风机不联起、轴承质量差、轴承磨损严重等
旋转失速	风机振动过大、风机过负荷运行时间长、润滑油系统冷却不到位、烟气温度过高、轴承冷却风机故障及备用冷却风机不联起、轴承质量差、轴承磨损严重等
喘振	风机长期工作在低负荷、烟风道积灰堵塞、烟风道挡板开度不足等
动（静）叶片调节失灵	风机调节传动部分内部出现故障、不完全燃烧造成动叶碳垢或灰尘堵塞，使动叶调节执行机构故障等
系统油压低	油泵故障、油泵吸入口不充满、油箱油位过低、溢流阀失灵、液压缸阀芯间隙过大或工作状况不良（排油量大）等

类型	具体算法	特点
无监督学习	K均值聚类	简单直观，适用于处理大规模数据，但对异常值敏感且随着数据维度的升高，性能会逐渐下降
	高斯混合模型	不局限于特定的概率密度函数形式，模型的复杂度仅与所研究问题的复杂度有关，与样本集合的大小无关
	层次聚类	算法简单，实现速度快
	主成分分析	算法简单，不受参数限制
	多元状态估计	无需额外指定参数，只需参数之间相互关联即可，且无需完整的故障库，计算速度快，时效性高
有监督学习	人工神经网络	非线性学习能力较强，但模型构建需要大量的数据，采用的是经验风险最小化原则，容易陷入局部极小点，而且收敛速度慢，网络结构复杂
	支持向量机	适合用于小样本数据，当数据测点较多时，会出现运算效率较低问题
	随机森林	强抗噪力、可调参数少、适应力强