高温快速加热条件下压力对煤气化反应特性的影响

Gasification in a Pressurized Fluidized Bed at High Temperature

建立了一套能同时实现高温高压和快速加热的实验设备和研究方法,使煤气化反应动力学基础研究能在与实际气流床煤气化炉相近的条件下进行.研究表明,当CO2体积分数相同时,最大CO生成速度随压力的升高而升高;煤焦的气化反应速度随全压的升高而升高.即使全压和CO2体积分数不同,只要CO2的分压、温度等其他条件相同,煤焦的气化反应速度就基本上一致.说明全压和CO2体积分数对煤焦气化反应速度的影响可以归纳为CO2分压的影响.高温快速加热条件下,除了温度以外,CO2分压是影响煤气化特性的重要因素.

An experimental facility and a method of simultaneously realizing high pressure, temperature and heating rate are developed, which makes it possible to study coal gasification under the condition close to that in a practical entrained flow gasifier. It was revealed that when CO2 concentration remained the same both the maximum CO forma- tion rate and the reaction rate of char gasification increased with the total pressure. Moreover, despite different CO2 concentration or total pressure, the reaction rate of char gasification was almost the same as long as CO2 partial pres- sure and other conditions remained uncharged. The results suggest that the influence of CO2 concentration and total pressure can be attributed to the influence of CO2 partial pressure. Under the conditions of high temperature and high heating rate, apart from temperature, CO2 partial pressure is another important factor influencing coal gasification features.