InterPore2025

Numerical Simulation of Multi-component Salts Dissolution Process Using the Lattice Boltzmann Method

Not scheduled

15m

Online Presentation (MS17) Complex fluid and Fluid-Solid-Thermal coupled process in porous media: Modeling and Experiment

Speaker

Wenxin Yang

Description

In underground salt cavern hydrogen storage and carbon dioxide geological sequestration, water injection salt dissolution technology is widely used for artificial excavation and expansion of salt caverns. In dissolution-type geothermal energy development, this process plays a crucial role in determining reservoir permeability and hydrothermal flow behavior. During the actual water injection salt dissolution process, multiple salt phases with different properties are often involved, and significant competitive interactions exist among these phases. This competition is primarily manifested in differences in diffusion rates, dissolution rates, and ionic concentration equilibrium constraints. The dissolution of one salt phase alters the ion concentration in the solution, thereby inhibiting or promoting the dissolution of other salt phases, leading to increased complexity in interface dissolution behavior. This competitive mechanism has a profound impact on dissolution rates, interface morphology evolution, and dynamic changes in the chemical environment of the solution.
Based on the lattice Boltzmann method (LBM), this study establishes a numerical model capable of simulating the dissolution dynamics of multi-salt systems. The model incorporates the coupling mechanisms of dissolution reactions, ion diffusion, and fluid flow, while also introducing thermodynamic equilibrium conditions and chemical reaction kinetics descriptions for multi-salt systems. By simulating the dissolution behavior of different salt phases, the study systematically investigates the effects of dissolution rates, interface evolution, and ion competition on the dissolution process. Additionally, the influence of fluid flow velocity and solution concentration on the dissolution process is analyzed. The results show that the dissolution rates and interface morphology evolution of different salt phases are significantly dependent on their solubility characteristics and ion competition effects in the solution. This research provides theoretical insights into the mechanisms of multi-salt dissolution and lays an important foundation for its application in environmental science, resource development, and chemical engineering.