基于Gibbs自由能最小化的生物质燃烧中K与Na迁移及转化规律模拟

运用Gibbs自由能最小化的原理,利用生物质燃烧模型模拟生物质燃烧过程中K,Na的迁移规律,同时对试验条件无法满足的高温、高压区域进行了预测.模拟结果表明:温度对碱金属释放量的影响比较大,温度为1 000℃时,气相碱金属元素K,Na的析出量分别占原料中K,Na质量的8.980％和6.05％；而当温度升高到1 400℃,...

Simulation of K, Na migration in biomass combustion process based on minimized Gibbs energy

Based on minimized Gibbs energy, a simulation model for biomass combustion is developed which focuses on K, Na migration, while experiment under condition of high temperature and high pressure is predicted. The result shows that temperature is the mostly important influencing factor in the operation conditions. Along with the increasing temperature, gaseous alkali concentration increases. When temperature increases to 1 000 ℃, 8.98% K and 6.05 % Na release from the raw meteral into gas. When temperature increases to 1 400 ℃, 96.6% K and 92.2% Na release from the raw meteral into gas. In the gas, mostly are alkali metal chlorides and seldom is alkali metal sulfate. When pressure is increased, the concentration of gaseous K and Na begin to decrease, the amount of solid-state K and Na increases.