The Integrated Energy System (IES) serves as an effective pathway for achieving low-carbon operation in industrial parks. This paper proposes an IES incorporating a dynamic utilization strategy for surplus wind and photovoltaic (PV) power, targeting natural gas industrial parks. The system introduces an electrolytic hydrogen production unit, with the generated hydrogen used for hydrogen-blended natural gas combustion. Taking total cost and carbon emissions as the comprehensive optimization objectives, the dynamic allocation ratio of surplus wind and PV power between hydrogen production and electricity storage is optimized. Under a tiered carbon trading mechanism, this study employs the Crested Porcupine Optimizer and Fuzzy Decision-making Scheme (CPO-FDS) for simulation, comparing the economic and environmental performance of three strategies: full storage of surplus power, full hydrogen production, and the proposed dynamic utilization strategy. The results indicate that compared to the full storage scheme, the dynamic strategy reduces annual operating costs by 94,000 CNY and carbon emissions by 160.05 tonnes. Compared to the full hydrogen production scheme, it reduces annual costs by 158,500 CNY and carbon emissions by 39.82 tonnes. This demonstrates that the proposed strategy can effectively balance the economic and environmental aspects of system operation, thereby enhancing the overall benefits of the IES in industrial parks.