Natural gas ultrasonic mass flowmeter

Abstract

The invention belongs to the technical field of fluid flow measurement, particularly relates to a natural gas ultrasonic mass flow meter, and aims to solve the blank and defect that the mass flow of natural gas with unknown components or changed components is difficult to measure in the natural gas pipeline network transportation technology at home and abroad. According to the technical scheme, a preferable gas flow meter measurement scheme and a preferable gas dynamic density meter measurement scheme are organically combined, and the composition structure of the natural gas mass flow meter is formed through organic fusion of gas volume flow, the flow area of a measurement pipeline flow channel and gas dynamic density. The wide-range-ratio measurement of the mass flow rate of the natural gas can be carried out under the three conditions of known components, unknown components and frequent change of the components of the natural gas.

Description

technical field [0001] The invention belongs to the technical field of fluid flow measurement, and in particular relates to an ultrasonic mass flowmeter for natural gas. Background technique [0002] The pipeline network is a pipeline network connected by multiple pipelines. The entrance of each branch pipeline in the pipeline network is called the branch node of the pipeline network. The pipeline network has one or several pipeline network source nodes, multiple pipeline network branch nodes, and There are many terminal outlet nodes, and the pipeline network realizes the transportation of fluid from the source of the pipeline network to the terminal outlets of the pipeline network. [0003] In the fields of gas, tap water, and heat supply for industry and people's livelihood, a huge pipeline network is involved, such as natural gas pipeline network, tap water pipeline network, and heating pipeline network. For the technical management and trade management of the pipeline n...

AI Technical Summary

Problems solved by technology

However, when the thermal flowmeter is measuring, it is necessary to set the components of the fluid to be measured and the ratio of each component in the thermal flowmeter in advance. Since the natural gas in the natural gas pipeline network is limited by natural gas exploitation resources, natural gas The components and the ratio of each component are not fixed, but change, so when the components of the fluid to be measured and the ratio of each component change, the thermal flowmeter cannot measure the quality of the fluid to be measured The flow rate, or the mass flow measured by the thermal flowmeter at this time, has a large measurement error. In addition, the thermal flowmeter consumes a lot of power when performing measurement. This is the characteristic of the thermal flowmeter. It can be seen from this , the thermal flowmeter cannot be used as a mass flowmeter to realize the balance measurement of the natural gas pipeline network

Based on its measurement principle, the Coriolis flowmeter cannot measure the gas mass flow of high-temperature mixed gas and gas composition changes. Due to the limitation of natural gas exploitation resources, the components and the ratio of each component in natural gas are not constant. Rather, it changes, so the Coriolis flowmeter cannot be used as a mass flowmeter to realize the balance measurement of the natural gas pipeline network. In addition, Coriolis flowmeters with small and large diameters are rarely manufactured, especially The cost of manufacturing or purchasing Coriolis flowmeters is high. So far, the market is basically foreign brands, and the localization rate is not high. It can be seen that Coriolis flowmeters are not suitable for the measurement of natural gas pipeline network volume balance. mass flow meter

[0008] From the above analysis, it can be seen that in order to realize the volume balance of the natural gas pipeline network and implement the monitoring and monitoring system for the volume balance of the natural gas pipeline network, mass flow meters must be installed at each node of the natural gas pipeline network, and the mass flow meters of the prior art cannot be used for natural gas. The volume balance of the pipeline network, so in order to provide technical means for the realization of the natural gas pipeline network volume balance monitoring and monitoring system, and to fill the gap in the natural gas pipeline network transportation technology at home and abroad, it is difficult to measure the mass flow rate of natural gas whose composition is unknown or changes It is necessary to research and invent a mass flowmeter suitable for natural gas pipeline network volume balance, which is also the problem to be solved in this application

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