Zhejiang Institute of Metrology research and development of three online testing technology to help companies improve quality

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[China Meter Network Instrument R&D] Zhejiang Province Metrology Institute found that in the energy metering review of energy-using units, many companies have the problem that online measurement instruments cannot be traced. This problem not only plagues companies, but also some technical problems that plague testing organizations. How to overcome these problems and help improve the quality of the company?

Picture Source Zhejiang Institute of Metrology
To this end, the Zhejiang Provincial Measurement Center Energy Center has set up an on-line inspection and research group to conduct in-depth research on the issue of on-line measurement and measurement of online measurement instruments involving trade settlements. Currently, three on-line inspection technologies, electronic belt scales, gas ultrasonic flow meters, and electric energy meters, have been developed to ensure the accuracy of transactions between companies, improve the accuracy of services, and lay a solid foundation for improving the quality of the company's own products. .
Focus on the use of energy companies belt scale online testing
The electronic belt weigher is a metering device that continuously and automatically weighs the material during the process of conveying the material by the belt conveyor. For enterprises, the fairness, accuracy, and efficiency of large-scale continuous bulk material transaction measurement will directly affect the economic benefits of enterprises and the cost accounting between units; for the internal company, the accuracy of the measurement of fuels, raw materials, etc., will affect product quality. And production costs have a greater impact. Therefore, the electronic belt weigher used for the measurement of solid bulk materials such as coal, ore, etc., is detected by ports, large-scale thermal power generation, metallurgy, coal, building materials, and chemical industries.
Based on the existing electronic belt scale detection method, Zhejiang Institute of Metrology has developed a weight-superimposed coal belt scale on-line detection system. The inspection system superimposes the standard weights on the weighing scales of the sub-scales in the course of conveying the materials. The stacking weights are used to simulate the theoretical superimposed values ​​of the materials, and the cumulative difference between the main and auxiliary belt weighers and the theoretical superimposed values ​​are compared. Online remote inspection of belt scales. The detection system has a simple structure, a small footprint, and is easily retrofitted on existing electronic belt weighers. The superimposed double weights have almost no effect on the belt tension in the process of conveying materials, and can realize real-time online measurement data of electronic belt weighers. Pass and online remote automatic detection. Since the inspection process is carried out during the process of material transport, problems can be detected in a timely manner, and it is not possible to wait until the end of the transport of the material and find that the measurement data is wrong and cannot be saved.
At present, the system has been put into operation at Luoshang Wharf of Shanghai Port Group Coal Co., Ltd., Zhejiang Zhenneng Wenzhou Power Generation Co., Ltd., and China Petroleum & Chemical Corporation Zhenhai Refining & Chemicals Branch. The site has been in good condition and has effectively solved the electronic belt. Scale online detection problems to ensure the accuracy of the transaction between enterprises, improve the level of industry transactions quality, but also lay a solid foundation for the company's own product quality improvement.
On-line detection of pipeline natural gas flow
Each gas station of the Zhejiang Natural Gas Corporation is equipped with on-line gas chromatographs and gas ultrasonic flowmeters. If it is dismantled and sent to a metering institution for traceability, it is not in line with the actual situation. In order to better ensure the reliability of gas ultrasonic flowmeter online work, Zhejiang Institute of Metrology studied and drafted JJF (Zhejiang) 1106 "Gas Ultrasonic Flowmeter Process Monitoring Specification", which provides technical specifications for the online detection of gas ultrasonic flowmeters.
The on-line detection of gas ultrasonic flowmeters can be monitored by the sound velocity comparison method according to the principle of time difference method, ie, the theoretical sound velocity of the gas in the pipe is calculated according to the natural gas composition, pressure and temperature, and the measured sound velocity of the gas ultrasonic flowmeter is performed. Comparing and accurately judging the working conditions of the flowmeter, it solves the problem of off-line measurement in the natural gas industry, and helps natural gas companies to effectively improve the accuracy of services and improve the level of safety and quality of services. At present, the Zhejiang Provincial Metrology Institute has completed the on-line inspection of Xiaoshan Power Plant, Banshan Power Plant, Guohua Power Plant and other units of gas ultrasonic flowmeters. The next step will be to successively carry out more than a dozen major metrological gate stations for the natural gas transportation pipeline network in Zhejiang Province. Gas ultrasonic flow meter on-line detection.
Key energy use enterprise energy meter online detection
In accordance with the requirements of GB 17167-2006 Energy Consumption Unit Energy Measurement Instruments Provision and Management General Regulations, electric energy meters are generally provided in major secondary energy-using units and major energy-using equipment. Some key energy-using units also have a power meter. Electric energy metering system composed of current transformers. Due to the influence of field current, voltage distortion and unbalanced three-phase unbalanced power load, the existing technical specifications have failed to meet the requirements of on-line detection of electrical energy measuring instruments. In order to solve the on-site detection of electric energy meters and energy metering systems under field conditions, the Zhejiang Provincial Measurement Institute cooperated with Hangzhou Aiengji Enterprise Management Consulting Co., Ltd. to develop a three-phase electric energy online metering device based on the transmission standard's long-term accumulated electricity comparison. . Using a set of high-precision electrical energy transfer standard system and the measured electrical energy metering system in parallel, under actual working conditions, the accuracy and reliability of the measured data of the system to be inspected are analyzed by comparing the accumulated electricity of the two systems within a certain period of time. .
At present, three-phase power on-line metering devices have completed the on-line inspection of more than 400 energy meters from 13 companies including Hangzhou Dingyi Food Co., Ltd., helping companies effectively solve the problem of on-line detection of electric energy meters.
(Original Title:Difficulties in Online Measurement of Enterprise Measuring Instruments?Difficulties in Researching and Solving Problems in Provincial Metrology Institute)

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