高准确度钟罩式气体流量标准装置自动检定系统的研究与设计

发布时间：2018-03-02 23:28

本文选题：气体流量标准装置　切入点：钟罩　出处：《浙江大学》2015年硕士论文　论文类型：学位论文

【摘要】：气体流量标准装置是为了复现气体流量标准量值而建立的硬件及软件系统,功能是将准确而统一的气体流量量值传递给用于天然气贸易计量的流量仪表,它的建立对于保证天然气贸易计量的准确性、可靠性和公正性具有重要意义。国家石油天然气大流量计量站的钟罩式气体流量标准装置是我国气体流量的原级标准之一,改造前自动检定系统设备老旧、功能单一,已不能满足精确测量和量值传递的需要。通过对其自动检定系统的改造,可以保障原级钟罩式气体流量标准装置的不确定度水平,加强系统功能,满足东北地区乃至全国气体流量量值传递的需要。本文在原有的钟罩式标准量器基础上,对其计量工艺和数据采集、控制系统进行了重新设计和改造,增加了临界流文丘里喷嘴的检定功能,保障了原级钟罩标准装置的不确定度,通过对自动检定系统软件、硬件的设计,提高了标准装置的可靠性和检定效率。本文分析了影响钟罩式气体流量标准装置计量准确性的因素,制定了相应的解决方案,配合高准确度传感器与控制器,尽可能地提高了数据采样的准确度与代表性,有效保障了原级标准装置的不确定度水平。为了提高该标准装置的可靠性与检定效率,本文设计了钟罩控制的联锁保护程序,位移测量的冗余设计,流量快速调节记忆程序等保障性程序。在计量工艺上,增设了检定临界流文丘里喷嘴的工艺流程,实现了用钟罩检定临界流文丘里喷嘴的功能。改造完成后,重新评定了系统的不确定度,对装置进行了重复性实验、稳定性实验测试,并采用7台高准确度与稳定性的德国ELSTER进口腰轮流量计作为比对标准,在本装置检定结果、德国原厂出厂系数及上海计量院校准结果之间进行了比对。实验及测试结果表明,该装置重复性、稳定性满足要求,具有较高的计量准确度。此次改造完善了我国低压天然气量值体系,对于保证东北地区乃至全国天然气贸易计量的准确、统一具有重要意义。
[Abstract]:The gas flow standard device is a hardware and software system established to reproduce the gas flow standard value. Its function is to transfer the accurate and uniform gas flow value to the flow meter used for natural gas trade measurement. Its establishment is of great significance to ensure the accuracy, reliability and fairness of natural gas trade metering. The bell-type gas flow standard device of the national oil and gas large flow metering station is one of the primary standards of gas flow in China. Before revamping, the equipment of the automatic verification system is old and old, and the function is single, which can no longer meet the need of accurate measurement and value transmission. By reforming its automatic verification system, the uncertainty level of the original bell-cover gas flow standard device can be guaranteed. The system functions are strengthened to meet the needs of the gas flow value transmission in Northeast China and even the whole country. Based on the original bell-type standard gauge, the measurement technology, data acquisition and control system are redesigned and reformed in this paper. The verification function of the critical flow Venturi nozzle is added to ensure the uncertainty of the standard device of the original bell hood. Through the design of the software and hardware of the automatic verification system, The reliability and verification efficiency of the standard device are improved. This paper analyzes the factors influencing the measurement accuracy of the bell-type gas flow standard device, and formulates the corresponding solution, which is combined with the high accuracy sensor and controller. The accuracy and representativeness of data sampling are improved as far as possible, and the uncertainty level of the original standard device is effectively guaranteed. In order to improve the reliability and verification efficiency of the standard device, the interlocking protection program controlled by the bell hood is designed in this paper. The redundant design of displacement measurement, the program of fast flow regulation and memory, etc. In the metering technology, the technological process of verifying critical flow Venturi nozzle is added. The function of calibrating the critical flow Venturi nozzle with the bell cover is realized. After the revamping, the uncertainty of the system is re-evaluated, and the repeatability experiment and the stability test are carried out on the device. Seven ELSTER imported waist wheel Flowmeters with high accuracy and stability were used as the comparison standard. The results were compared between the verification results of the device, the factory coefficients of the original German factory and the accurate results of the Shanghai Institute of Metrology. The experimental results and the test results showed that, The repeatability and stability of the unit meet the requirements of high accuracy of measurement. The revamping improves the value system of low-pressure natural gas in China, which is of great significance to ensure the accuracy and unity of the measurement of natural gas trade in Northeast China and even in the whole country.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH814

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