Device and method for monitoring natural gas emission during gas pipeline construction

Abstract

The invention relates to a device and method for monitoring natural gas emission during gas pipeline construction. The device includes: a dynamic pressure measurement component connected to the emission pipe of the pipeline to be replaced, and used to pass the pressure sensor connected to it during the natural gas emission process. Measure the velocity dynamic pressure in the release pipe and the total pressure in the pipeline; wireless remote transmission component: connected with the pressure sensor to send the pressure data to the data acquisition instrument; power management component: used to supply power to the pressure sensor and wireless remote transmission component; Data acquisition instrument and simulator: used to receive the pressure data collected on site, build a simulation model for simulation, and obtain the total amount of natural gas released during the release time period. Compared with the prior art, the present invention has the advantages of combining on-site measurement and fluid simulation technology, being convenient and accurate, and comprehensively considered.

Description

technical field [0001] The invention relates to the field of gas pipeline construction monitoring, in particular to a device and method for monitoring the natural gas emission during construction of a gas pipeline by combining fluid simulation and field measurement. Background technique [0002] Before the construction of the natural gas pipeline is completed and the natural gas is about to be connected, the replacement (or "release") process must be carried out to release the residual air or natural gas-air mixture in the pipeline into the atmosphere to prevent the natural gas used by users from containing air. Once the natural gas-air mixture enters the user's combustion equipment, it will cause serious accidents such as explosions. [0003] The current operation process after the construction is completed, such as image 3 shown. Install a release pipe on the downstream side, usually a short pipe of DN50, and slowly open the upstream valve V1. For gate valves, it is gene...

AI Technical Summary

Problems solved by technology

Theoretically, according to the actual physical parameters of the pipeline and the pressure of the upstream pipeline, the dynamic composition and velocity at the release pipe can be obtained through fluid simulation, and the proportion of natural gas in the total release can be directly determined. However, because the pressure of the upstream pipeline varies with The use of the pipes connected to it will change, and the frictional resistance of the pipes to be replaced will also have an impact. Simple simulation calculations cannot give credible results.

[0006] In the current construction process, only rely on the empirical method of methane concentration measurement to ensure that there is no large amount of air in the pipeline to be replaced, and do not measure the amount of natural gas released during the construction process. If the flow meter is used to measure directly, the mixed gas flow rate is obtained instead of The proportion of natural gas cannot be distinguished, and the actual pressure upstream of the pipeline cannot be obtained by relying solely on fluid simulation calculations, which will cause large errors

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