Natural gas energy meter

Abstract

The invention relates to a natural gas energy meter comprising a turbine flow sensor, a pressure sensor, electric valves, a thermal mass flow sensor and a temperature sensor. The turbine flow sensor is mounted on a main pipe of a pipeline, an inlet and outlet of a branch pipe are respectively formed in front and rear of the turbine flow sensor, the thermal mass flow sensor is mounted on the branch pipe, the electric valves are mounted in front and rear of the thermal mass flow sensor respectively and are used for controlling the open and close states of the branch pipe, the pressure sensor is mounted on the main pipe of the pipeline in front of the inlet of the branch pipe, and the temperature sensor is mounted on the main pipe of the pipeline in rear of the outlet of the branch pipe. The natural gas energy meter is simple in structure, a feature of utilizing small flow to calibrate large flow is adopted, and range ratio is expanded; the method of on-line calibration is adopted, the process of disassembling for detecting can be avoided, accuracy of the turbine flow sensor is guaranteed, using time is also guaranteed, and operating efficiency is improved greatly.

Description

technical field [0001] The invention belongs to the technical field of natural gas energy measurement and relates to a natural gas energy measurement instrument. 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, accounting for 35% of the energy structure. With the continuous rise of the status of natural gas as an environmentally friendly energy source, accurate, fair and just measurement of natural gas is an important technical work for scientific management of natural gas, which is related to the interests of many parties. At the same time, as natural gas is used as a fuel, its actual value should be its calorific value rather than its volume. Foreign natural gas measurement methods generally use energy measurement methods, so it is inevitable that unnecessary disputes will arise during the transfer of natural gas trade...

AI Technical Summary

Problems solved by technology

[0003] The flowmeters widely used in natural gas energy measurement in the world are mainly standard orifice flowmeters and turbine flowmeters. However, standard orifice flowmeters have large pressure loss, poor measurement repeatability and accuracy, and are affected by many factors. It is difficult to improve the measurement efficiency. the accuracy of

The turbine flow sensor has the advantages of high accuracy, wide measurement range, good repeatability and small pressure loss. However, the turbine flow sensor has movable parts, and long-term work will cause the turbine to wear and reduce the measurement accuracy, so its verification period is relatively long. short

Since it cannot be calibrated online, dismantling it is a waste of time in laboratory verification, and affects work efficiency, thus affecting the application of turbine flow sensors in natural gas metering

Images