Natural gas purification process exception monitoring method based on independent component contribution degree weighting analysis

Abstract

The invention discloses a natural gas purification process abnormity monitoring method based on independent component contribution degree weighting analysis. The monitoring method is implemented by the following steps of (1) selecting process parameters in a monitored high-sulfur-containing natural gas purification and desulfurization production process; (2) collecting data, under a normal workingcondition, of the process parameters in the natural gas purification process; (3) preprocessing the data; (4) building a model based on independent component contribution degree weighting, and calculating a total residual three-order cumulant HE and a weighted total independent component three-order cumulant HSw under the normal working condition; and (5) calculating a joint index SE under the normal working condition, obtaining a control limit of a statistic quantity of the joint index SE, acquiring the data, under the working condition, of the process parameters in the high-sulfur-containing natural gas purification and desulfurization production process on line, recalculating the joint index SE by an input model, performing statistics whether the sample joint index exceeds the controllimit or not, and if the limit is exceeded, determining that the working condition is exceptional, otherwise, determining that the working condition is normal. According to the method, a fault can bediscovered in time.

Description

technical field [0001] The invention relates to fault detection and diagnosis technology in the desulfurization production process of high-sulfur natural gas, in particular to a fault monitoring method in the natural gas purification process based on weighted analysis of independent component contribution. Background technique [0002] my country is rich in high-sulfur gas reservoir resources, with cumulative proven reserves exceeding 1×10 12 m 3 , great development potential. The content of acidic components in this kind of gas field is as high as dozens of times that of ordinary gas fields, and the highly toxic component hydrogen sulfide (Hydrogen sulfide,H 2 S) It will cause strong corrosion to the collection facilities, pipelines and purification devices, and the risk of safe development is extremely high. Once the production process breaks down, resulting in the leakage of acid gas, it will cause serious casualties and environmental pollution accidents. Therefore, t...

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Problems solved by technology

However, when HCA constructs the independent component space HS index, it does not distinguish the importance difference of the selected independent components, and this small difference will lead to a certain degree of deviation in the final result after being amplified by the high-order accumulation of samples. resulting in false positives and false negatives

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