摘要
采用热重法研究了工业用大颗粒 T305脱硫剂在温度为200～400℃,H_2S 浓度为5～20g/Nm^3条件下脱除 H_2S 的颗粒的宏观动力学。通过扫描电子显微拍照(SEM)、电子探针分析和热重数据证明,脱硫过程主要受颗粒产物层扩散控制,指出脱硫过程存在最佳温度 T_(opt),分析了 T_(opt)存在的原因。
By thermogravimetric method,the macrokinetics of desufurization with T305 ZnO absorbent has been studied in the temperature range of 200-400℃ and the H_2S concentration of 5—20 g/ Nm^3. For verifying the distribution of sulfur within reacted absorbent granules,SEM and electron probe have been used. According to experimental results,it is found that shrinking—core model is feasible to discribe the kinetic behavior,and the reaction is basically controlled by H_2S diffusion through ZnS layer. The diffusion coefficient,De,do not change regularly.There exists a minimum time for a same conversion of ZnO,as 40%,at 300℃ where H_2S can be removed most quickly. The causes of existence of the so—called optimal temperature is discussed.
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
1992年第3期274-280,共7页
Chemical Reaction Engineering and Technology
基金
国家自然科学基金
山西省自然科学基金
关键词
脱硫剂
脱硫
宏观
动力学
煤气
Sulfur absorbent(desulfurizer)
Desulfurization
Macrokinetics
