摘要
在天然气或合成气制氢过程中，借助于石灰石煅烧分解与石灰吸收二氧化碳的化学循环反应，去除反应产物，破坏化学平衡，可以连续地驱动化学反应进行，从而提高氢气的产率，同时控制温室气体二氧化碳的排放．在多功能热重反应器（TGR）内就化学循环反应过程中的颗粒尺寸、温度煅烧分解率等对吸附剂煅烧分解和吸收特性的影响进行了比较充分的实验研究．当吸收反应温度在500℃～620℃范围内时，CaO吸收二氧化碳的反应速率与石灰石中钙的利用率都维持在比较高的水平，石灰石分解后产生的氧化钙的利用率增长比石灰石的分解率增长慢，分解率高，吸热量也高，因此，简单地提高石灰石的分解率并不是提高石灰石钙利用率的最佳选择。
Hydrogen production from natural gas or syngas is promoted and gas productivity is raised when emission of greenhouse gas, CO2 is controlled via chemical looping reaction of limestone calcination and carbonation of calcium oxide by CO2, which may remove one of the products of the reaction from the mixture and may disrupt chemical dynamic equilibrium. Influence of particle size, temperature and calcination extent on limestone calcination and carbonation of calcium oxide is analyzed in the dual-environment thermal gravimetric reactor in detail. Carbonation and Ca utilization of limestone reached their highest level at 500℃ to 620℃. Increase of calcium utilization of CaO calcined can not keep up with increase of calcination of limestone. The higher the calcination,the higher the absorption heat, thus increase of calcination is not are best method to improve calcium utilization.
出处
《煤炭转化》
CAS
CSCD
北大核心
2006年第2期54-58,83,共6页
Coal Conversion
基金
国家自然科学基金资助项目(50306026)
关键词
石灰石
化学循环
制氢
二氧化碳回收
limestone,chemical looping reaction,hydrogen production, CO2 removal
