Error Analysis and Reduction Measures of Steam Vortex Flowmeter Measurement
Error Analysis and Reduction Measures of Steam Vortex Flowmeter Measurement Xiamen Jingchuan JCVF steam metering instrument is the main basis for the current industrial heat supply for steam flow settlement. Therefore, the accuracy of meter measurement has a significant impact, which is directly related to the economic interests of both parties. However, due to the current problems in the selection and installation of steam meters, and the lack of effective maintenance management measures, the measurement accuracy of steam measuring instruments cannot be guaranteed. It is easy to cause conflicts of interest between the two parties, causing economic interest disputes. Therefore, it is necessary to conduct an in-depth analysis of the causes of the steam flow measurement error, and then take effective measures to improve the accuracy of the steam flow measurement. 1 Error analysis of steam flow measurement 1.1 Vapor density factor Mass flow is an important way to detect steam flow. The medium is supersaturated steam or single steam. At the same time, volume measurement and density measurement directly affect the mass flow of steam. Measuring the vapor density usually requires compensation of temperature and pressure. Usually, a look-up table method or a simple mathematical formula can be used, and the measurement of the steam flow rate lacks the speciality due to the error of the measured temperature and pressure. 1.2 Differential pressure signal transmission error The error of differential pressure signal transmission is mainly reflected in the following three aspects: (1) The lateral pressure of the transmitter or the condensing tank is not equal. When there is a difference in the height of the sampling tube and the condensing tank for measuring the flow, or the position of the transmitter does not reach the level during the installation process, the corresponding pressure will be generated, thereby affecting the accuracy of the measurement; (2) The impulse line causes transmission distortion. If the installation of the impulse line does not meet the specific requirements and standards, it will affect the speed of the bubble inside the tube to the mother tube, so that the condensate can not fill the entire pipeline at a fast speed, which affects the accuracy of the signal; (3) The joint of the sampling tube leaks, resulting in measurement deviation. There is a problem such as joint leakage in the joint of the sampling tube. When the heating is stopped, the condenser can no longer generate condensed water. Once there is still leakage in the pipe joint at this time, the height of the condensed water inside the sampling pipe will be different, and a static pressure will be formed. If the condensed water level on the low pressure side is lower than the high pressure side, a certain heating flow will be formed. , zui eventually leads to deviations in steam flow measurement. 1.3 Sampling transmitter failure If the sampling transmitter that measures the steam flow fails, the measurement drifts, causing a certain error in the measurement results. Since the zero point of the flowmeter is affected by the drift and temperature drift of the analog device, once the differential pressure signal is disturbed by vibration, vibration, etc., the zero point of the flowmeter will drift. 2 Measures for reducing the error of industrial heating steam flow measurement After a brief understanding of the source of error in industrial heating steam flow measurement, the author will conduct an in-depth analysis on the rational design and selection of measuring instruments, the correct installation of vortex flowmeters, and the maintenance of metering instruments. 2.1 Reasonable design and selection of measuring instruments The design and selection of measuring instruments must first consider the consumption of steam, which is commonly used, zui small, and zui. At the same time, the quality of steam must also be included in the analysis. Only the steam consumption of the three types of common, zui, and zui will be used. By achieving quantitative data representation, designers can obtain a flow consultation form as a design reference, and possible design errors can be avoided. In order to further improve the quality of meter selection design, type selection, specification and model confirmation are also the key points for designers to consider. The type selection here refers to the use of vortex flowmeters for low-pressure steam with a small steam flow for a long period of time. For users with large flow and stability, it is recommended to use differential pressure flowmeters. The former generally refers to steam pipes below DN300, while the latter refers to steam pipes below DN300. Steam pipe above DN400; specification and model confirmation means that the design of the meter needs to meet the requirements of small measurement accuracy of Zui Da and Zui. If the user has large diameter and low pressure in this process, the designer can pass the reasonable Reduce the diameter to solve the problem. It is worth noting that some users with small flow differences or large flow changes often have higher difficulty in the design of meter design. Therefore, the author suggests that the former chooses the differential pressure transformer, while the latter uses the dual transmitter. The industrial heating steam flow measurement accuracy of the two can be better satisfied. 2.2 Correct installation of vortex flowmeter Vortex flowmeters are mostly used for steam pipes below DN300, and in order to ensure their measurement accuracy, the installation of vortex flowmeters must be taken seriously. The installation position of the vortex flowmeter directly affects the measurement progress. The installer must recognize that the straight pipe requirements shown in the specification are only low conditions for ensuring the measurement accuracy, and understand the sensitivity of the vortex flowmeter to the mechanical vibration and pulsation of the pipeline. In order to ensure that the vortex flowmeter is installed in the excellent location. In addition, the measurement accuracy of the vortex flowmeter is also affected by radio frequency interference, steam with water, and foreign matter in the pipeline, which must also be included in the precautions for the installation of the vortex flowmeter. Compared with the ordinary vortex flowmeter, the integrated vortex flowmeter has higher requirements on the ambient temperature, which makes the insulation performance of the steam pipeline affect the measurement accuracy many times, which also needs to be included in the installation personnel. 2.3 Strengthen the maintenance and management of measuring instruments The maintenance and management of measuring instruments needs to be combined with regular and irregular inspections, and at the same time, regular verification work should be done. Among them, regular and irregular inspections need to focus on the working status of the vortex trap, the tightness of the balance valve closure, the state of the instrument seal, the door switch record, the thermal network status parameter, the accuracy of the temperature and pressure compensation parameters, and important components. Corrosion degree and other links; regular verification work requires a strict combination of verification management system to do regular inspection of measuring instruments. It is worth noting that when the meter has abnormal working conditions, the relevant responsible personnel need to carry out the verification inspection immediately. 3 Conclusion In summary, the measurement error of the steam flowmeter is caused by many aspects, and only by taking all-round treatment measures can the measurement error be effectively reduced. Through the reasonable design and selection of the meter, the meter can meet the continuity and stability requirements of the steam meter to the steam meter. By taking the correct installation technique, it is possible to avoid damage to the meter and thus avoid affecting its measurement accuracy. By strengthening the maintenance and management of the measuring instruments, the instrument problems can be discovered in time and processed in time to keep them in good working condition. Keywords: steam flow meter, working principle of steam flow meter, steam flow meter, steam flow meter of food factory, steam flow meter of leather factory, steam flow meter of printing and dyeing factory, steam flow meter of textile factory, steam flowmeter of Fujian Peru Squid ,Peru Jumbo Flying Squid,Peru jumbo flying squid Zhoushan Boda Aquatic Products Co.,Ltd , https://www.baida-aquatic.com