超临界水流速对煤颗粒群气化制氢速率的影响

The technology of hydrogen production through coal gasification in supercritical water provides a significant technical direction for clean, low-carbon, safe, and efficient fossil energy conversion. In this paper, considering the fluid-solid two-phase flow, heat transfer and homogeneous/heterogeneous chemical reaction processes, a numerical simulation method for reactor-scale four-way coupling of multicomponent supercritical fluid turbulence and reactive particle has been established. The influence of supercritical water flow rate on the hydrogen production rate of coal particles in the reactor is investigated. The study clarifies the role of natural convective vortices in the reactor in promoting the fluid-solid reaction. It is found that the flow direction of convective vortices is reversed as the reaction proceeds. It is clarified that the hydrogen production rate at the reactor outlet increased with the increase of the supercritical water flow rate, and the optimal interval of the ratio of the supercritical water flow rate to the coal slurry feed flow rate was given.