摘要
对经Na2CO3溶液调质石灰石煅烧产物CaO的物理结构及硫化特性进行了研究,发现同等条件下调质后石灰石煅烧产物CaO（M-CaO）比未经调质的CaO（N-CaO）具有更高的钙转化率。利用XRD技术对CaO晶体结构进行了测定,通过比较二者的晶胞参数和晶格畸变度等并结合其孔特性,证实M-CaO之所以比N-CaO具有更高的钙转化率,是由于M-CaO比N-CaO具有更高的晶体缺陷浓度,使得在硫化反应过程中通过产物层的扩散具有更高的离子扩散率。
The sulfation characteristics of a limestone sorbent modified by Na2CO3 as additive were investigated in this paper. It is shown in experiments the CaO formed by the modified limestone have higher calcium conversion in sulfation than that formed by the nonmodified limestone. To find the causes further the unit cell parameters and lattice distortion of CaO were measured by means of XRD. From the crystal structure and pore characteristics the cause account for that M-CaO has higher Ca conversion than N-CaO was verified. The M-CaO has more defects concentration than N-CaO, so in the sulfation reaction the product layer formed by M-CaO also has more defects than that formed by N-CaO. This will accelerate the ions diffusivity in product layer and make the sulfation reaction continue effectively.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2002年第5期641-644,共4页
Journal of Engineering Thermophysics
基金
973国家重点基础研究专项经费资助项目(No.G1999022206)
