Portable natural gas flow measuring and checking system

Abstract

A portable natural gas flow measuring and checking system comprises an on-site flowmeter, a natural gas flow measuring and checking device and a portable computer; the on-site flowmeter does real-time measuring to the on-site flow capacity and transmits the data to the natural gas flow measuring and checking device; the natural gas flow measuring and checking device receives the field data from the on-site flowmeter and transmits the data to the portable computer; the portable computer processes the detected data from the natural gas flow measuring and checking device; one end of the natural gas flow measuring and checking device is connected to the on-site flowmeter and the other end is connected to the portable computer. The system has the advantages of high measuring accuracy, better measuring ability, low power consumption, better interference resistance, broad application sphere of electric voltage, simple and convenient operation, convenient carrying and the like, and the invention can be widely used in the measuring and detecting of water, water vapor, sewage and the like in the industries of petroleum, chemical industry, electric power, metallurgy and the like to guarantee the stability of measuring capacity of on-line meter.

Description

technical field [0001] The invention belongs to the technical field of energy applications, and in particular relates to a portable natural gas flow metering and checking system. Background technique [0002] In recent years, with the completion of long-distance natural gas pipelines such as Shaanxi-Beijing and West-East Gas Transmission, the application of natural gas in my country has become more and more extensive. The accuracy and reliability of its measurement are directly related to the economic interests of both supply and demand. [0003] According to the "Measurement Law" and the requirements of the flowmeter verification regulations, the accuracy of the flowmeter in the custody transfer measurement of the natural gas long-distance pipeline must be regularly verified and calibrated. Currently, the most widely used verification methods are offline verification and dry verification. . Among them, the off-line verification method is to connect the tested flow meter an...

AI Technical Summary

Problems solved by technology

It is only suitable for orifice plates, nozzles and Venturi flowmeters, and the verification accuracy is low, and it is impossible to qualitatively or quantitatively grasp the errors of the tested flowmeters, directly calibrate or assign values ​​to flowmeters, and cannot eliminate additional errors such as installation.

[0005] At present, the following problems generally exist in domestic natural gas flow measurement: 1. Most of the eight physical parameters that affect natural gas flow are three-parameter single methods, and the resulting calculation error is at most about 0.01%; 2. Only natural gas components are considered Several parameters such as methane, nitrogen, carbon dioxide and their relative density; 3. Mass measurement and energy measurement are not introduced; 4. Most of them use a single meter, and there is no verification system. During the online measurement process, there is a large deviation in measurement performance ;5. Most of them use software configuration to realize online measurement. There is no professional measurement calculation module and function, and the complex processing ability for measurement results is relatively weak.

[0006] To sum up, there are many domestic flowmeter manufacturers, lack of flow calculation principles and on-site practical experience, the level of research and development technology is different, or the user sets parameters improperly, resulting in flow measurement inaccuracy sometimes as high as 10%. The environment is different, the flow rate cannot be reproduced, and it takes a long time for the measurement system to be verified by the legal metrology institution, resulting in immeasurable economic losses

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