On-line gas density measuring method

Abstract

The invention provides an on-line gas density measuring method which realizes the parameter measurement by utilizing a measuring device; the measuring device comprises a galvanostat, a throttle, a differential pressure sensor and a computer, wherein the inlet end of the galvanostat is connected with measured gas, and the outlet end of the galvanostat is communicated with air through the throttle; two air pressure input interfaces of the differential pressure sensor are connected with pressure sampling pipes at two sides of a throttle hole of the throttle, and the signal output end of the differential pressure sensor is connected with the input port of the computer; during testing, the measured gas continuously flows through the galvanostat and the throttle sequentially, the pressure difference Delta between two ends of the throttle are measured at the same time, then the density of the measured gas is calculated by using the following formula: p:p=2*deltaP / (qV / C / (1-Beta4)0.5*epsilon*Pi / 4*d2)2. Due to the adoption of the method, not only is the on-line measurement of the gas density realized, but also the measuring device is simple in structure, low in cost, and exact and reliable in measuring structure, and furthermore, a condition is created for the accurate measurement of flow of mixed gas and the accurate control of gas density.

Description

technical field [0001] The invention relates to a method capable of accurately measuring the density of mixed gas on-line, which belongs to the field of measurement technology. Background technique [0002] Gas density is one of the important parameters required in the flow measurement of mixed gas (such as gas, natural gas, etc.). Only when the accurate gas density is obtained, can the accurate gas flow be obtained. Due to the difficulty in measuring the gas density, the existing flow measurement methods generally use intermittent sampling analysis or estimation to determine the gas density, which greatly reduces the measurement accuracy and affects the fairness of billing. For example, when each natural gas filling station measures the natural gas flow, the density parameter is manually input, which often causes great trade disputes. The same problem exists in city gas metering and the metering and control of gas density in industrial production. [0003] The gas density...

AI Technical Summary

Problems solved by technology

However, since this method has high requirements on the machining accuracy of the vibration tube and the resolution of the frequency measurement device, the manufacturing cost and maintenance cost of the metering device remain high, which greatly limits the promotion and application of the metering device.

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