摘要
内藏孔板流量计、小孔板流量计是标准孔板流量计往微小流量方向的延伸。具有结构简单,维修方便,可靠性高,使用寿命长,性能稳定,抗干扰能力强,耐振性好,耐腐蚀问题容易解决,压力损失小,变更量程方便等特点。在制药等精细化工行业、化工小试装置以及轻工行业的添加剂计量中,得到广泛应用。但这种流量计属非标差压式流量计,不能像标准差压流量计那样由执行标准来保证准确度,文中介绍用逐台实流标定的方法保证准确度。多点标定得到的误差,可用折线法在流量二次表或DCS中予以校正,从而使准确度得到提高。由于流量微小,可借助工艺管道上的切断阀、放空阀或仪表专业预先设置的校验口实现流量示值的现场校准或比对,从而判断流量计是否准确。文中还阐述了设计选型时应注意选用合适的结构,大量应用实例表明,这一方法在技术上是成熟的,应用是成功的。
The built-in orifice flowmeter and small orifice flowmeter are the extension of the standard orifice flowmeter to the small flow. It has the characteristics of simple structure, convenient maintenance, high reliability, long service life, stable performance and strong anti-interference, good vibration resistance, easy to solve the problem of corrosion resistance, low pressure loss, easy to change the range, etc. It has been widely used in the measurement of additives in the pharmaceutical and other fine chemical industries, chemical pilot plants and light industry. This kind of flowmeter is a non-standard differential pressure flowmeter, the accuracy cannot be guaranteed by implementing standards like standard differential pressure flow meters, article introduces the method of real-flow calibration one by one to ensure accuracy. The error obtained by multi-point calibration can be corrected in the flow secondary meter or DCS with the broken line method, so as to improve the accuracy. Due to the small flow rate, the on-site calibration or comparison of the flow rate indication can be achieved by means of the shut-off valve, vent valve on the process pipeline, or the calibration port preset, so as to determine whether the flowmeter is accurate. The article also states that the appropriate structure should be selected when designing and selecting. A large number of application examples show that this method is technically mature and the application is successful.
作者
路超
陈志成
王增根
纪波峰
Lu Chao;Chen Zhicheng;Wang Zenggen;Ji Bofeng(Jiangsu PFRI Pharmaceutical Co.,Ltd.,Suqian 223800;Jiangsu Alpha Pharmaceutical Co.,Ltd.,Suqian 223800;Shanghai Tontion Automation Instrumentation Co.,Ltd.,Shanghai 200070)
出处
《化工与医药工程》
2021年第6期51-55,共5页
Chemical and Pharmaceutical Engineering
关键词
内藏孔板流量计
小孔板流量计
精细化工
添加剂
实流标定
误差校正
现场验证
built-in orifice flowmeter
small orifice flowmeter
fine chemicals
additive
calibration error correction
on-site verification
