Progressive evaluation method and system for hydrogen-doped conveying of urban natural gas pipeline network

The invention provides a progressive evaluation method and system for hydrogen-doped conveying of an urban natural gas pipeline network, and solves the technical problem that the reliability judgment of the hydrogen-doped ratio is lacked during hydrogen-doped conveying of the existing urban natural gas pipeline network. The method comprises the following steps: carrying out quality quantitative evaluation on mixed gas according to physical and chemical parameters of gas source gas; performing pipe network availability evaluation according to the operation and maintenance data of the in-service natural gas pipe network; forming a theoretical hydrogen doping ratio range and pipe network transformation adaptation data according to the quality of the mixed gas and the adaptation degree of the availability of the pipe network; and monitoring the running state of the adaptive pipe network formed according to the pipe network transformation adaptive data under the theoretical hydrogen doping ratio to form in-service