焦炉煤气多声道超声波流量测量方法研究

Coke oven gas is an important products and consumables in metallurgy industry. The flow measurement of coke oven gas is also an important part in energy measurement for each consumption. Most of the coke oven gas flowmeters at present are orifice flowmeter or pitot tube flowmeter which exist a problem of big pressure loss. Besides, the variation of ash accumulation, gas density, humidity in the coke oven gas pipe has a great influence on measurement results of differential pressure flowmeter. What is more, it requires frequently maintenance. This project will research a measurement method of multichannel ultrasonic flowmeter for the coke oven gas with a small pressure loss and interventional flow measurement method. So based on the multichannel ultrasonic flow measurement method, this project will research a complex flow field distribution model of coke oven gas pipe, an optimum design of multichannel ultrasonic transducer’s of arrangement structure and installation position, the establishment of multichannel ultrasonic flow measurement model and the like. It will also research ultrasonic signal processing methods on the condition of the measurement of coke oven gas flow and develop a multichannel ultrasonic flow measurement experiment system of coke oven gas. Based on the calibration experiment in Measurement Test Institute Of JiangXi Province and the flow measurement experiment of the operating condition of coke oven gas in Fangda Special Steels Co. Limited Of Nanchang, Jiangxi, a flow measurement compensation model of the stantarded condition will be established based on components, temperature, pressure and humidity of operating conditions of coke oven gas to improve the multichannel ultrasonic flow measurement system performance of coke oven gas to meet the application requirement of 1% measurement accuracy.

焦炉煤气是冶金企业重要的产品和消耗品，焦炉煤气流量测量是各能耗单位能源计量的重要环节。目前焦炉煤气流量计大多为孔板或均速管流量计，存在压损大的问题，且焦炉煤气管道积灰程度、气体密度、湿度的变化对差压式流量计测量结果影响大，需频繁维护。本项目研究压损小、非介入式测量方式的焦炉煤气多声道流量测量方法，项目拟在多声道超声波流量测量方法的基础上，研究焦炉煤气管道复杂流场分布模型、多声道超声波换能器布置结构与安装位置的最优设计、焦炉煤气多声道超声波流量测量模型的建立等科学问题，并研究焦炉煤气流量测量环境下的超声波信号处理方法、研制焦炉煤气多声道超声波流量测量实验系统，通过在江西省计量测试研究院的校准实验以及江西省南昌市方大特钢股份有限公司的焦炉煤气工况流量测量实验，建立基于焦炉煤气工况组分、温度、压力、湿度的标况流量测量补偿模型，完善焦炉煤气多声道超声波流量测量系统性能，达到1% 测量精度应用要求。

因焦炉煤气管道积灰程度、气体密度、湿度的变化对介入式流量测量结果影响较大，目前绝大多数焦炉煤气测量还是选用传统的孔板、均速管和微锥流量计。本项目着重研究非介入式测量方式的多声道气体超声波流量计研制技术，并考虑在焦炉煤气等易污染超声波换能器的介质流量计量中的应用。.（1）针对多声道气体超声波流量计和超声波燃气表在其测量范围的大流量点和小流量点重复性难以解决问题，本课题提出了基于峰值检测的变阈值、变增益超声波回波过零检测方法的大流量点的超声波信号与数据处理方法，此成果已发表国际会议EI检索论文；针对小流量点难以提高测量重复性问题，采用了基于改进的卡尔曼滤波算法的超声波信号与数据处理方法，此成果已投稿SCI检索期刊。该成果可指导多声道气体超声波流量计的推广应用具有科学意义与实用价值。.（2）采用双缓冲罐稳压与多支路标准表汇合的方法，建立了适应高速中高压气体流量计实验室校准装置，可以满足实验室模拟工业状况温度和压力条件下气体流量计的校准实验。该项成果已获得国家发明专利1项（已授权），并发表了国际会议EI检索论文1篇，此论文被大会评为优秀报告论文。.（3）为了解决在焦炉煤气等易污染超声波换能器的问题，项目组受武汉易维环境有限公司委托研究易插拔维护的智慧管件型超声波流量测量管段，并以水流量计量与监控作为研究起点，已受理了一种基于深度卷积神经网络的水务管道漏损探测方法及系统的国家发明专利。该成果下一步应用于焦炉煤气、瓦斯等不易拆卸维护和易污染气体流量的计量与监控中，具有突出的创新性与应用前景。.（4）在该项目成果的基础上，分别受四川弗罗尔仪表有限公司、辽宁航宇星物联仪表有限公司委托，研制的DN50-150四种型号的多声道气体超声波流量计，测量范围优于目前国内产品，具有较好的应用前景。研制的G25超声波燃气表样机成果，具有自主知识产权，打破了目前国内依赖日本松下流道和测量模块的状况，即将在智慧城市建设中起着促进作用。

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