【摘要】 基于石灰石等钙基脱硫剂在加压气化炉内可能同时发生煅烧和脱硫反应的事实,在Thermax 500型加压热重分析仪上进行了还原条件下石灰石的煅烧和脱硫过程同时进行的实验,主要研究了温度(800～900℃)和CO2分压(0～0.03,MPa)等因素的影响.结果表明:反应气体中无CO2时,石灰石煅烧和脱硫两个反应过程的影响程度与温度有关,800,℃比900,℃时更为明显;在CO2存在的条件下,石灰石的煅烧速率减缓,影响了后续脱硫过程的快速进行,而脱硫反应产物CaS的存在也严重抑制了煅烧过程的进行;在高CO2分压下,石灰石煅烧和脱硫过程之间的相互影响较大.更多还原

【Abstract】 Based on the fact that both calcination and sulfidation of limestone in high-pressure gasifiers may occur simultaneously,simultaneous calcination and sulfidation experiments were carried out in a pressurized thermogra-vimetric analyzer under reducing atmosphere,and the effects of temperature(800—900,℃)and CO2 partial pres-sure(0—0.03,MPa)on the reaction were investigated according to the sample mass loss curves.The experimental re-sults show that the simultaneous calcination and sulfidation processes are influenced by temperature in the absence of CO2 in mixture gases,which is more obvious at 800,℃.In the presence of CO2 in mixture gases,calcination reac-tion rate becomes slower significantly and hence hinders subsequent sulfidation reaction.In addition,the CaS product layer also greatly slows down the calcination process.It is concluded that for the simultaneous calcination and sulfida-tion of limestone at high partial pressure of CO2,calcination and sulfidation processes have a great influence on each other.更多还原