Experimental Study on Pore Distribution Characters and Convert Rate of CaO  

作　　者：LiJIA YanyanZENG TaoZHANG 

机构地区：[1]DepartmentOfPowerEngineeringSchoolofMechanical,ElectronicControlEngineering,BeljingJiaotongUniversity,Beijing100044,China.

出　　处：《Journal of Thermal Science》2005年第1期87-91,共5页热科学学报（英文版）

摘　　要：During the reaction between calcium sorbents and SO2, calcium sorbents are first calcined and converted into CaO. CaO can be obtained by calcining Ca(OH)2or CaCO3. The porosity of the sorbent is increased because of calcination and is decreased because of sulfurization. In the calcination process H2O or CO2 is escaped from the particles and pores are formed in particles. The reaction or convert rate of CaO is influenced strongly by the pore structure characters. From Ca(OH)2 to CaO the escape velocity of H2O or its mass transfer is one of the key factors influencing the pore forming. During calcination process different healing velocity, different heating time and temperature were suggested. The temperature rising rate and calcining temperature play important role to the pore structure. The convert rates of CaO obtained through different calcining conditions were investigated experimentally. Some interesting results were showed that the calcium utilization of CaO particles is determined not only by the special surface area and total pore volume, but also by pore-size distribution. The main factor influencing the sulfation is the pore diameter distribution at lower sulfation temperature. For higher reaction temperature specific volume is the important reason. But pore-size distribution is strongly influenced by heat flux and temperature in the calcining process.

关 键 词：pore-size distribution CALCINE desulfurization. 

分 类 号：X701.3[环境科学与工程—环境工程]