Method, device, and storage medium for measuring nitrogen content

A system for measuring a nitrogen content to control the production of argon, comprising:

• an air separation unit for producing argon;
• an analyzer for obtaining an actual nitrogen content;
• online measuring instruments for detecting related variables associated with the nitrogen content, wherein the related variables comprise at least one of liquid void purity, argon fraction quantity, air quantity, argon fraction purity, upper column pressure, and argon fraction temperature;
• and
• a device for measuring nitrogen content of the air separation unit, wherein the device comprises a memory, a processor, and a program stored in the memory, wherein when executing the program, the processor implements the method comprising the following steps:
• determining the related variables associated with the nitrogen content;
• establishing an initial model, by a processor, wherein the initial model takes the related variables as independent variables and the nitrogen content as dependent variables according to a historical operation data, and calculating parameters in the initial model, by the processor;
• according to parameters in the initial model, obtaining parameters in a soft-sensing model by fitting, by the processor;
• according to detected values of the related variables and the soft-sensing model, predicting the nitrogen content in real-time, by the processor, wherein the detected values of the related variables are detected by the online measuring instruments;
• and
• according to the predicted nitrogen content and the actual nitrogen content obtained through the analyzer by periodic sampling, obtaining, by the processor, a fusion detection result to be returned as a measured nitrogen content in an argon fraction of the air separation unit, so as to control the argon production in the air separation unit based on the measured nitrogen content.