Method and device for calculating leakage of liquid pipeline

Abstract

The invention provides a calculation method and device of a liquid pipeline leakage amount. Leakage orifices in practice is equivalent to a circular orifice, characteristic line equations and an orifice outflow calculation formula are combined to establish a pipeline leakage model, pipeline leakage boundaries are quantitatively characterized, model output pressure flow amount data obtained by iterative calculation are compared with actually collected real-time pressure flow amount data, it is considered that a current iteration orifice diameter is an actual leakage orifice diameter if difference between the both meets a precision condition, then variation of a pressure flow amount and a leakage speed of a whole line over time can be simulated and calculated, and then the total leakage amount can be predicted in real time. According to the calculation method of the liquid pipeline leakage amount of the invention, real-time calculation of the leakage amount can be carried out in a case of unknown orifice diameters, and compared with calculation results of a statistical method and an indirect estimation method, a calculation result of the calculation method of the invention is higher in a feasible degree.

Description

technical field [0001] The invention relates to the field of pipeline leakage detection, in particular to a calculation method and device for liquid pipeline leakage. Background technique [0002] Factors such as pipeline corrosion, natural damage, man-made damage, and pipeline defects may suddenly cause pipeline leakage. The medium transported by liquid pipelines in chemical industry parks is generally dangerous chemicals such as flammable, explosive, and highly toxic. Therefore, once a leak occurs, it will not only directly cause large losses to the economy of the chemical industry park, but also cause major secondary disasters such as fire, explosion, poisoning, and environmental pollution. [0003] According to investigations, more than 80% of chemical plant leakages occur in chemical delivery pipelines. Since the determination of the pipeline leakage hazard area is directly related to the leakage volume, when studying the failure consequences of the pipeline, the leak...

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Problems solved by technology

Among them, most of the studies are based on the known shape and size of the leakage orifice, and then use the orifice outflow calculation formula to carry out the calculation of the leakage amount. However, in practice, when the pipeline leaks, especially the transmission It is difficult to obtain the shape and size of the leakage orifice in the pipeline of chemical dangerous goods at the first time, so the calculation of the leakage rate and leakage amount by the existing calculation method will cause large errors, and even get wrong data

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