Performance evaluation method for natural gas analysis system

A method for evaluating performance of a natural gas analysis system, comprising:

• obtaining components of the natural gas analysis system as well as a maximum allowable error and a maximum allowable deviation of a calorific value of each of the components, wherein the components refer to a category and a content of a certain elementary substance in the natural gas analysis system;
• determining, according to the components of the natural gas analysis system, components and uncertainties of groups of standard gas mixture by using a principle of uniform distribution, wherein the uncertainties are related to the natural gas analysis system;
• performing, by the natural gas analysis system to be evaluated, 10 times component analysis in turn on the components of each group of standard gas mixture, and recording original data regarding peak areas;
• performing drift correction on the original data regarding peak areas to obtain drift-corrected peak areas;
• performing gross error elimination on the drift-corrected peak areas and obtaining final peak areas of respective components of each group of standard gas mixture;
• performing regression analysis between the components of the standard gas mixture and the final peak areas subjected to the drift correction by using a generalized least squares method to obtain calibration functions of the natural gas analysis system and analytical functions of the respective components of the standard gas mixture;
• calculating, by using the calibration functions of the natural gas analysis system, a peak area related to each of components in 10,000 groups of natural gas mixtures, then calculating, by using the analytical functions, a component related to each peak area, and calculating and obtaining an uncertainty and a calorific value uncertainty of each of the components of natural gas mixtures;
• and
• judging whether an evaluation result from the natural gas analysis system to be evaluated is qualified, and providing a performance evaluation conclusion for the natural gas analysis system.