Abstract: One of the auxiliary technologies for blast furnace ironmaking in hydrogen-rich carbon cycles is high reduction potential gas heating. The advancement of regenerative gas heating technology, which is based on the hot blast furnace's operating principle, would significantly aid in the conversion and modernization of traditional blast furnaces into hydrogen-rich carbon cycle blast furnaces. In light of this, this study created a three-dimensional mathematical model of the entire furnace, designed a top-fired gas heating system with a heating scale of 50 000 m³/h, simulated and examined the temperature change rule of reducing gas and refractory materials under the real working system, and examined the operational features of the gas heating process. The impact of the height of thermal storage chamber with varying characteristics on the internal temperature field of the gas heating furnace and the temperature of the gas outlet was also investigated. According to simulation results, the designed thermal storage gas heating furnace operate with a two-hour thermal storage and one-hour gas supply system and yet meet the requirement of an air supply temperature over 1 100 ℃; Reducing the height of the low creep clay brick layer in the middle of the heat storage room can shorten the interval of carbon precipitation of the gas inside the chamber and move the interval of carbon precipitation to the interval that can reach a higher temperature when thermal storage is in progress, which can make the precipitated carbon be eliminated more easily, and thus provides a theoretical basis for the optimization of the performance of the top-heating type gas heating furnace.