Investigation on pressure drop characteristics of supercritical water seepage in porous media

The thermo physical properties of fluids such as viscosity coefficient, specific heat capacity, thermal conductivity, density change dramatically near the critical point. Thus the law of pressure drop characteristics of supercritical water seepage in porous media is complex and the fitness of porous seepage pressure drop characteristics of traditional fluid needs to be verified. Coal supercritical water gasification technology as one representative of high-tech development demands further investigation on pressure drop characteristics of supercritical water seepage in porous media. The effects of the typical operating parameters (temperature 300~450℃, pressure 22.7~25 Mpa, flow rate 0.8~3 kg·h^-1) on the pressure drop characteristics of supercritical water flowing in porous media were systematically studied. The experimental results showed that the viscous term was overestimatedand the inertial ter-munderestimated when the Ergun formula was used to estimate the pressure drop for the pressure drop of supercritical water flowing through porous media. It is expected that the study provide the basis for the design of the supercritical water fluidized bed in coal supercritical water gasification technology.