应用于非满管流，科里奥利质量流量计应用于双组分液浓度测量等。 Discuss the progress of flow measurement application technology in recent years, including the expansion of application fields, such as ultrasonic flow meters for natural gas transfer measurement, electromagnetic flow meters for non-full pipe flow, Coriolis mass flow meters for two-component liquid concentration measurement Wait. This paper expounds how people pay attention to economic benefits from the three levels of reducing measurement error loss, reducing operating costs, and reducing initial installation costs. The paper also reviews the research results on the effects of installation conditions and media parameters on flow measurement.
可以不对管道作任何改动就可作非接触测量。 In the past 50 years, many new measurement principles of flow measurement methods and instruments have been developed, which has greatly expanded the application field. Entering many of the past restricted areas, electromagnetic flow meters can be used for non-contact measurement without any changes to the pipeline. In the past, some flow meters were difficult to measure the flow of certain special objects; today, it has become easier due to technological breakthroughs. However, the requirements of emerging industries such as environmental protection engineering cannot be met by existing methods. To be developed. The flow of wealth through flow meters is huge, and it is measured by the transfer of more than 100 million tons of oil and subsequent products produced in China. The transferred wealth is calculated on the order of 1012 (square billion) yuan, and the measurement loss of 0.1% to 0.2% is as high as billions. yuan. Although the accuracy of the flow meter has been improved to the level of 0.1 to 0.2, it seems that it is still not satisfied. We still need to keep improving. The meter price is still willing to purchase. However, for large-scale and wide-range meters, the various expenses including the meter purchase fee are minimized. Overcoming or reducing the impact of pipeline installation in flow meter application technology is a long-term exploration. The impact of changes in fluid parameters on measured values of flow meters is a problem that users are very concerned about and has gained a lot in recent years. This article intends to discuss these aspects.
Environmental protection industry application outlook
在环境保护中，污水中的污染物不仅要控制其排放百分比含量，更重要的是控制其排放总量，为此要求计量污水排放总量。 In the environmental protection of electromagnetic flowmeters , pollutants in sewage must not only control the content of its discharge percentage, but more importantly control its total discharge. To this end, it is necessary to measure the total discharge of sewage. The open channel sewage flow meter for the measurement of industrial sewage discharge in China has been successively developed by various manufacturing plants in the mid-1980s. In 1987, the State Environmental Protection Administration began to investigate and evaluate the products provided by more than 10 manufacturing plants. After more than two years of laboratory and field evaluation, the State Environmental Protection Administration believes that it is possible to establish an open channel sewage flow meter in China. Ten years later, the performance of meters has become more complete and the variety has increased. Driven by the national environmental protection policy, the demand for flow meters in the environmental protection industry has increased rapidly. Although domestic sewage flow meters and total oxygen demand (TOC), mercury, chromium, cadmium and other metal ions and arsenic, aniline, phenate and other pollutants on-line analytical instruments, but the user must design their own, supporting the site The assembly has not been specially designed by the manufacturer, and the factory assembly and commissioning of the complete set of instrument assemblies that supply the total amount of pollutant emissions is a promising project that needs to be developed. Pollutants in the exhaust gas mainly refer to SO2, NO2, H2S, O2, etc. in the flue gas emitted from boilers and automobile exhaust. The 1990 US Clean Air Act amendment required power plants to reduce total sulfur dioxide and nitrogen oxide emissions that would cause acid rain. The US Environmental Protection Agency requires that approximately 2,500 boilers in 773 power plants must be equipped with a continuous emissions monitoring system (CEMS) before January 1, 1995. But China has not yet promulgated similar regulations. Nowadays, domestic instruments for measuring flue gas flow are only applicable to TH / TR series thermal gas flowmeters in Kaifeng Instrument Factory, but only for small and medium-sized pipe diameters below 350mm. There is still no suitable instrument for large-scale flues in power plants. Foreign product sales There are many varieties. As with sewage discharge, the next step is to develop a total monitoring instrument assembly for the total amount of gaseous pollutants discharged from the on-line analysis instrument. Direct measurement of automobile exhaust emissions is a very difficult technical problem, because the measured high temperature and the flow of strong pulsating flows containing water vapor and dust is still in the exploratory stage abroad.