Coupling system and method for carbon capture of skid-mounted natural gas hydrogen production flue gas

The invention relates to a coupling system and method for carbon capture of skid-mounted natural gas hydrogen production flue gas, and the coupling system comprises a flue gas pretreatment unit, a membrane separation unit and a pressure swing adsorption unit which are sequentially connected through a pipeline, the membrane separation unit is used for carrying out enrichment and separation treatment on flue gas, and the pressure swing adsorption unit comprises a permeable gas compressor, an adsorption tower, a replacement gas storage tank, a product gas buffer tank, a vacuum pump, a replacement compressor and a program control valve group and is used for carrying out adsorption, sequential discharge, replacement, vacuumizing and boosting treatment on the flue gas in sequence. By adopting a method of combining membrane separation and pressure swing adsorption, the capture rate and the concentration of carbon dioxide in the flue gas subjected to membrane separation and pressure swing adsorption coupling decarbur