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Advantage analysis of intelligent orifice flowmeter in actual measurement
时间:2020-07-29浏览量:530

随着近几年的测量应用不断推陈出新,许多新型测量天然气流量计不断出现,如气体涡轮流、智能超声流量计等等各式新型流量计产品。不过因为孔板流量计测量应用具有历史悠久、应用范围广、维护方便、结构简单、寿命长和价格低廉等等的特点,并且孔板流量计的标准型产品可以不经过校准环节直接确定信号(差压压力)与流量之间的关系,并有以此估算出它在测量过程中产生的误差值等与众不同之处,这一点优势是在较多的流量计中是比较好的。因为这个因素,可以预见,在以后的相当的长的时期中,因为各种原因的约束,尤其是在不能够有效地解决标定点问题之前,孔板流量计仍然是测量天然气流量的优选,孔板流量计在如今的天然气测量仪表市场中仍占有着不容小视的地位。并且因为自动化技术应用到孔板流量计的系统之中,使香孔板流量计这种传统流量测量仪器不断克服自身存在的人为误差等不利的因素,让其计量的准确程度日益提高。

With the continuous innovation of measurement applications in recent years, many new types of natural gas flow meters are emerging, such as gas vortex rotation, intelligent ultrasonic flowmeter and so on. However, because the orifice flowmeter measurement application has a long history, wide application range, convenient maintenance, simple structure, long life and low price, and so on, and the standard products of orifice flowmeter can directly determine the relationship between signal (differential pressure) and flow, and estimate the error value generated in the measurement process At the same time, this advantage is better in more flowmeters. Because of this factor, it can be foreseen that in a long period of time, due to the constraints of various reasons, especially before the calibration point problem can not be effectively solved, the orifice flowmeter is still the preferred measurement of natural gas flow, and the orifice flowmeter still plays an important role in today's natural gas measuring instrument market. And because of the application of automation technology in the orifice flowmeter system, the traditional flow measurement instrument of fragrant orifice plate continuously overcomes the adverse factors such as human error, so that its measurement accuracy is increasingly improved.

当今新型流量计发展趋势向着一体化、高精度、宽量比发展,具有功能强大的软件系统,同时拥有补偿功能完善的流量计算机系统,并且设有RS485标准计算机通信接口,可与DCS连接通信,对维护检修提供了方便。由于新颖的差压变送器可同时测量差压、静压和温度,并经计算单元作气体压力、温度修正或测气体质量流量,减少了独立的传感器数量,简化管线工程,降低安装费用;减少管线开孔,降低潜在泄露点,提高整体可靠性,这些都为孔板流量计更好地应用提供了可靠的技术保证。在采用孔板流量计测量天然气流量时,如对孔板流量计的一次装置(孔板节流装置)和二次仪表(差压、静压、温度、天然气物性参数计量器具等)配套仪表的选择、设计、安装、使用都严格按照有关标准进行,并在受控状态下使用时,其流量测量准确度是可以控制在±1%~±1.5%范围内的。

At present, the development trend of new flowmeter is towards integration, high precision and wide ratio. It has powerful software system and flow computer system with perfect compensation function. It also has RS485 standard computer communication interface, which can connect with DCS and provide convenience for maintenance and repair. Because the new differential pressure transmitter can measure the differential pressure, static pressure and temperature at the same time, and the calculation unit can correct the gas pressure and temperature or measure the gas mass flow rate, thus reducing the number of independent sensors, simplifying the pipeline engineering and reducing the installation cost; Reducing pipeline opening, reducing potential dew point and improving overall reliability provide reliable technical guarantee for better application of orifice flowmeter. When the orifice flowmeter is used to measure the natural gas flow, the selection, design, installation and use of the primary device (orifice plate throttling device) and the supporting instruments (differential pressure, static pressure, temperature, natural gas physical parameter measuring instruments, etc.) of the orifice flowmeter are strictly in accordance with the relevant standards. When used under the controlled state, the flow measurement accuracy can be controlled within ± 1 %Within the range of ± 1.5%.

孔板流量计流量测量范围扩展方式改进在石油天然气测量中,对流量变化大的场合,传统做法是同时配备多块β值不同的孔板或并列几台流量计。新型智能孔板流量计,在流量计算机上采用扩展差压分解功能系统,不用更换孔板和差压变送器就可完成;另一个扩展功能就是大流量侧计量范围的扩张,这是将差压扩大,从而使大流量侧的计量范围加以扩大的一种系统。另外还有超宽幅范围方式,量程比可达1:180,采用2台差压变送器,各自负担着小流量范围和大流量范围的测量,各自独立发信号,流量计算机则把这些信号分成不同领域进行变换选择,并在各领域进行演算,从而使超宽幅范围在测量上也能保证较高的精度。虽然多投入了1台差压变送器,但是与并列2台流量计的设备费用相比,既提高了经济效益,又节省了来回切换的麻烦;与采用多块孔板的方法相比,避免了孔板更换,降低了生产操作难度。

In oil and gas measurement, when the flow rate changes greatly, the traditional method is to equip multiple orifice plates with different β values or several flowmeters in parallel. The new intelligent orifice flowmeter adopts the expanded differential pressure decomposition function system on the flow computer, which can be completed without replacing the orifice plate and differential pressure transmitter; another expansion function is the expansion of the measurement range at the large flow side, which is a system that expands the differential pressure and expands the measurement range of the large flow side. In addition, there are ultra wide range mode, the range ratio can reach 1:180. Two differential pressure transmitters are used to measure the small flow range and the large flow range respectively, and send signals independently. The flow computer divides these signals into different fields for transformation and selection, and performs calculation in each domain, so that the ultra wide range measurement can also ensure high accuracy. Although more than one differential pressure transmitter is invested, compared with the equipment cost of two flow meters in parallel, it not only improves the economic benefits, but also saves the trouble of switching back and forth; compared with the method of using multiple orifice plates, it avoids the replacement of orifice plates and reduces the difficulty of production operation.

由于天然气流量计量是一种多参数的间接的、、动态的、不可再现的测量,天然气的流量计量是流量测量更是工业生产测量中的难题之一。因此,选择具体测量施工方案和计划时,应特别重视系统的可靠性、准确性和先进性。

As natural gas flow measurement is an indirect, dynamic and non reproducible measurement with multi parameters, the flow measurement of natural gas is a flow measurement, and it is also one of the difficult problems in industrial production measurement. Therefore, when choosing the specific construction plan and plan, we should pay special attention to the reliability, accuracy and advanced nature of the system.

由于生产中的控制和管理日益趋向于智能化和自动化,所以,如果企业信息网络本身的基础比较成熟上,则可可建立以企业信息网络为纽带的站控系统,实现计量系统数据的远程组态控制,可提高企业的生产效率。

As the control and management in production tends to be intelligent and automatic, if the foundation of enterprise information network itself is relatively mature, the station control system linked by enterprise information network can be established to realize remote configuration control of measurement system data, which can improve the production efficiency of enterprises.


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