摘要
随着火电厂智能化转型,实时监测输灰仓泵内的料位是确保系统高效、安全运行的关键。目前,传统的声学料位监测技术如雷达式、超声波式等存在一定的局限性,特别是在粉煤灰这类多孔介质中的监测效果不理想。因此,该文提出了一种新的监测方法,即通过测量低频声波通过粉煤灰介质后的声音强度来检测料位高度。分析了粉煤灰的多孔介质模型,并基于Delany-Bazley-Miki模型分析了其声学特性。通过COMSOL软件,对低频声波在粉煤灰介质中的传播和衰减过程进行了仿真分析,探究了声波强度与料位高度之间的关系。仿真结果表明,低频声波在粉煤灰介质中的传播和衰减特性可以有效反映料位高度的变化,为料位监测提供了一种新的途径。
With the advancement of intelligent transformation of thermal power plants,real-time monitoring of the material level in ash silo pump has become the key to ensure efficient and safe operation of the system.At present,traditional acoustic material level monitoring technologies such as radar and ultrasonic have certain limitations,especially in porous media such as fly ash,where the monitoring effect is not ideal.Therefore,this paper proposes a new monitoring method,which is to detect the material level by measuring the sound intensity after low-frequency sound waves pass through the fly ash medium.The porous medium model of fly ash was first established,and its acoustic characteristics were analyzed based on the Delany-Bazley-Miki model.The propagation and attenuation process of low-frequency sound waves in fly ash medium was simulated and analyzed by COMSOL software,and the relationship between sound wave intensity and material level was explored.The simulation results show that the propagation and attenuation characteristics of low-frequency sound waves in fly ash medium can effectively reflect the changes in material level height,providing a new way for material level monitoring.
作者
赵德虎
陈朝晔
曾晰
罗斐凡
温聪
ZHAO Dehu;CHEN Zhaoye;ZENG Xi;LUO Feifan;WEN Cong(Zhejiang Zheneng Wenzhou Power Generation Co.,Ltd.,Zhejiang Wenzhou 325000,China;Zhejiang Universityof Technology,Zhejiang Hangzhou 310014,China)
出处
《工业仪表与自动化装置》
2025年第3期75-80,120,共7页
Industrial Instrumentation & Automation
基金
浙江浙能温州发电有限公司科技项目(ZNKT-2023-057)。
关键词
COMSOL
声测
粉煤灰
料位监测
多孔介质
声学特性
COMSOL
acoustic measurement
fly ash
material level monitoring
porous media
acoustic characteristics
