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可燃气体流量测量与泄漏检测技术研究
论文作者:童鞋论文网  论文来源:www.txlunwenw.com  发布时间:2019/9/26 10:32:59  

摘要:伴随着现代工业的迅猛发展,环境污染问题愈发的严重,使用新型高效、环保节能的清洁能源势在必行,类似于天然气这类利用率高、清洁无污染的可燃气体受到了极大的关注和重视。国内外针对可燃气体的流量测量与泄漏检测相关研究取得了一定的成就。但是,对于管道气体流量测量的精度、气体泄漏状况的检测仍存在较大的误差。因此,迫切需要进一步提高管道气体流量的测量精度,同时能够针对管道可燃气体的泄漏状况进行实时监控和检测,以保障管道可燃气体安全可靠的使用。

本课题通过运用超声波技术,采用时差法的测量原理。通过将软件技术和硬件设备相结合,将数值模拟与实验相结合的方法,以达到提高管道可燃气体流量测量的精度为目的。

首先对时差法测量原理以及计算算法进行说明和分析,为避免电路延迟时间影响以及由环境温度对声速的影响等因素而造成系统测量时间精度的不准确性,对时差法测量原理的算法进行改进,消除一定的影响因子,提高测量结果精度。并通过研究换能器的特性指标,选取适用于系统测量的换能器型号。

其次整个硬件系统以低功耗设计为理念,采用模块化设计方案,包括测量计时电路模块,单片机控制电路模块,信号采集处理模块,电源供电模块,数据显示模块,泄漏报警模块等。通过计时芯片MAX35104进行超声波时差测量,以STM32F103单片机芯片完成对整个测量系统的控制。电路集成度高,外围电路得到简化,提高了系统的稳定性和抗干扰性。

进一步结合系统硬件电路部分,完成对软件系统的各部分模块程序流程设计。包括系统软件主程序设计、MAX35104初始化程序设计、MAX35104时间测量程序设计、系统中断服务子程序设计以及泄漏检测程序设计等。

最后,通过仿真软件对管道超声波气体流量测量进行CFD数值模拟与分析,观察管道不同流速下超声波流量测量的误差状况,验证系统流量测量算法的可行性。并对气体流量测量系统进行空气静态实验、标定流量动态实验以及管道泄漏检测实验,通过分析实验数据结果,确定了测量系统的参数指标。

总的来说,此课题结合前人研究经验及存在的不足,设计出更加优化的测量方案。并通过芯片选型、电路设计、绘图制板、软件编程、模拟仿真及实验验证等工作,进一步论证了整个测量系统的可行性。

With the rapid development of modernindustry, the problem of environmental pollution has become more and moreserious. It is imperative to use new and high-efficient, environment-friendlyand energy-saving clean energy. Combustible gas with high utilization rate andno pollution, such as natural gas, has attracted great attention. Someachievements have been made in the flow measurement and leakage detection ofcombustible gas at domestic and foreign. But, there are still large errors inthe ccuracy of gas flow measurement and the detection of gas leakage.Therefore, it is urgent to further improve the measurement accurcy of pipelinegas flow, and monitor and detect the leakage of combustible gas in real time toensure the safe and reliable use of pipeline combustible gas.

This topic uses the ultrasonic technology,and uses of the time difference method mesurement principle. By combiningsoftware technology and hardware equipment, the method of combining numericalsimulation and experiment is used to achieve the purpose of improving theaccuracy of pipeline combustible gas flow measurement.

First of all, on the measurement principleand calculation method of time difference algorithm description and analysis,in order to avoid delay time circuit and by the factors such as the effect ofenvironmental temperature on the system caused by the precision of measuringtime is not accuracy,the algorithm for measuring the principle of timedifference method is improved to eliminate certain influence factors andimprove the accuracy of measurement results. By studying the characteristics ofthe transducer, the tranducer model that is actually used for systemmeasurement is selected.

Secondly, the whole hardware system adoptsthe concept of low power design and modular design, including measurementtiming circuit module, single-chip control circuit module, signal acquisitionand processing module, power supply module, data display module, leakage alarmmodule. The time difference was measured by the timing chip MAX35104, and thewhole measurement system was controlled by STM32F103 microcontroller chip.Thecircuit integration is high, the peripheral circuit is simplified, and thestability and anti-interference of the system are improved.

Further integrate the hardware circuit ofthe system to complete the design of the program flow chart of each module ofthe software system. Including system software main program design, MAX35104initialization program design, MAX35104 time measurement program design, systeminterrupt service subroutine design, leakage detection program design and soon.

Finally, through CFD numerical simulationand analysis of ultrasonic gas flow measurement in pipelines with simulationsoftware, the error status of ultrasonic flow measurement in pipelines withdifferent flow rates was observed, and the feasibility of the system flowmeasurement algorithm was verified. In addition, the air static experiment,calibrated flow dynamic experiment and pipeline leakage detection experimentwere carried out for the gas flow mesurement system. The parameters of themeasurement system were determined by analyzing the experimental data.

In general, this subject combines theprevious research and the existing deficiencies, to design a more optimizedmeasurement scheme. And through chip selection, circuit design, drawing board,software programming, data debugging and experimental verification, thefeasibility of the whole measurement system is further demonstrated.

关键词:MAX35104;超声波;时差法;流量测量;泄漏检测

MAX35104;Ultrasonic;The time differencemethod;Flow measurement;Leak detection

上一篇:超声波气体流量计整流器技术研究     下一篇:氧化铈基材料的合成及其在苯甲醇选择氧化和酯交换反应中的研究
 
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