Measuring device and measuring method of natural gas flow rate

Abstract

The invention relates to a measuring device and method of natural gas flow. The measuring device is composed of a sensor, a sensing circuit, signal amplifiers, filters and a single chip microcomputer, wherein the sensor is composed of four thermal resistors and a platinum resistor, and the sensing circuit is composed of four precision resistors, a potentiometer, an operation amplifier and a triode. Two voltage signals output by the sensor and a voltage signal output by the sensing circuit pass the three signal amplifiers and then are connected with the input ends of the three filters respectively, and the output ends of the three filters are connected with an AD sampling port of the single chip microcomputer. The measuring device and method are simple in structure, the four thermal resistors and the platinum resistor serve as sensing elements, a gas flow measuring and direction detection circuit is designed, and the gas flow is measured in a constant temperature difference method. A measuring circuit is powered up through a battery, and the problem that power supply is inconvenient in remote areas is solved. As is shown in an experiment, the measuring device is high in response speed in gas flow measurement, response time is less than 10ms, and the measuring range is 0-50m / s.

Description

technical field [0001] The invention belongs to the technical field of natural gas flow measurement, and relates to a measurement device and a measurement method for natural gas flow. Background technique [0002] As a high-quality, high-efficiency, clean energy and important chemical raw material, natural gas has been widely valued and used preferentially in all countries in the world. It has brought a clean environment and high-quality life to human beings. As the status of natural gas as an environmentally friendly energy source continues to rise, and as an important part of the natural gas industry, the measurement of natural gas runs through the process of exploitation, transportation, storage, trade and use of natural gas, so the measurement of natural gas is a scientific An important technical task of management. However, the temperature and pressure of natural gas vary greatly, the flow range varies widely, and the pipe diameter is large and irregular in shape. As a...

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Problems solved by technology

[0003] The purpose of the present invention is to design a natural gas flow measurement method and device that can be powered by a battery, low power consumption and has a wide measurement range, which can solve the problems of low natural gas measurement range ratio and inconvenient power supply. Detects backflow in pipelines

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