Abstract: The utilization of blast furnace slag and its residual heat presents a significant challenge to the steel industry.China, being a major player in the steel industry, how to recover the waste heat in the slag and carry out waste heat power generation is an important part of energy saving, emission reduction and environmental protection. Currently,there are several methods for slag waste heat recovery, including mechanical crushing, air blowing, and centrifugation,among others. However, these methods have immature heat recovery technologies, and each method has its own drawbacks. In order to improve the heat energy recovery of the water quenching method, reduce the footprint of the recovery device, and enhance the cooling efficiency of the slag, this paper conducts research on a swirl-flow-based slag waste heat recovery device using numerical simulation. The primary focus of the study is to investigate the heat release characteristics of the slag, its flow behavior, and the steam production of the device. Simulation results indicate that the residence time of the slag within the swirl-flow reactor can reach up to 15 seconds, ensuring sufficient heat exchange time. The design of the slag-capturing mesh can accelerate the settling of slag within the reactor. Furthermore, due to the significant specific heat and latent heat of water, the cooling rate of the slag can meet the requirements for producing glassy state slag products in cement production. By employing the swirl-flow method for slag waste heat recovery, it is anticipated that a substantial amount of superheated steam can be generated. This is expected to result in a considerable annual income, demonstrating significant potential for practical applications.