氢化铝锂颗粒释氢反应过程热-力特性分析及其恒速释氢技术

To address ihe challenge of ihe extremely fast and difficull-lo-conlrol hydrogen release rale during the hydrolysis reaclion of lithium aluminum hydride (LiAlH₄), An investigation into ihe fundamental characteristics of the reaclion between LiAlH₄ particles and waler is begun. The thermal-mechanical process of LiAlH₄ particle hydrolysis is examined. A constant-rate hydrogen release device incorporating a reaclion chamber for the hydrogen storage material is designed. The effects of LiAlH₄ particle size, material forming force, and material column diameter on the hydrogen release characteristic curves during hydrolysis are investigated. The results indicate that during the hydrolysis reaclion, LiAlH₄ particles are subjected to thermal expansion buoyancy, microbubble thrust, fluid resistance, static water buoyancy, and gravity. The entire hydrogen release process during hydrolysis comprises three stages: driving acceleration, resistance equilibrium- and deceleration sedimentation. In the driving acceleration stage, hydrogen is rapidly released, and the microbubble thrust dominates, propelling the particles to rise rapidly. During the resistance equilibrium stage, hydrogen release nears completion, the relative motion speed of the particles gradually decreases, and fluid resistance becomes dominant, leading the particles lo approach a stale of resistance equilibrium. In the deceleration sedimentation stage- the reaclion products sediment gradually due to their gravity exceeding buoyancy. Under a material forming force of 19.6 kN, LiAlH₄ particles with a particle size around 200 mesh exhibit the most effective constant-rate hydrogen release. It provides a safe, effective- and controllable method for achieving constant-rale hydrogen release from LiAlH₄, supporting its potential future application as a hydrogen energy carrier.