混合方式对CaO/煤焦水蒸气气化反应的影响  

Influences of mixing methods on CaO/char steam gasification

作　　者：张攀威 王波[1,2] 田文栋[1,2] 阳绍军[1,2] 肖云汉[1,2] 

机构地区：[1]中国科学院工程热物理研究所,北京100190 [2]中国科学院能源动力研究中心,江苏连云港222069 [3]中国科学院大学,北京100049

出　　处：《煤炭学报》2016年第8期2097-2105,共9页Journal of China Coal Society

基　　金：国际科技合作计划资助项目(2013DFB60140-03);中国科学院战略先导科技专项资助项目(XDA07050500)

摘　　要：采用某内蒙烟煤,基于加压固定床反应器,通过气体产物分析研究了CaO/煤焦混合方式以及反应条件对煤焦水蒸气气化反应的影响。研究表明,在相同反应气氛下,添加CaO能够显著提高煤焦水蒸气气化反应速度,且其提高程度与CaO/煤焦的混合方式有关,与不添加CaO时相比,CaO/煤焦混合物共热解制得的煤焦/CaO水蒸气气化反应速度可提高182.34%,而煤单独热解制得煤焦与CaO机械混合的煤焦/CaO水蒸气气化反应速度仅提高21.13%,钙离子在煤焦中的分散程度是影响CaO/煤焦水蒸气气化反应的主要因素。CaO/煤焦水蒸气气化反应速率随Ca/C摩尔比增加先升高后降低,在Ca/C摩尔比约为1.0时反应最快。当温度由650℃升高至750℃,CaO/煤焦水蒸气气化反应速度提高了594.67%;水蒸气分压力由0.35 MPa提高至0.50,0.65 MPa,气化反应速度分别提高了95.86%和204.14%。The reaction rates of a bituminous coal（ Inner Mongolia） steam gasification with CaO additive had been studied with a pressurized fix-bed reactor through gas products analysis. The results show that CaO additive has a sufficient effect on char steam gasification rate,and the promotion effect of CaO on char steam gasification has a positive correlation with the mixing extent between CaO and char. Compared with non-CaO gasification,the steam gasification rate of char / CaO mixture which is the product of coal / CaO co-pyrolysis increases by 182. 34%. In addition,the steam gasification rate of the mixture of CaO and char that made of coal individual pyrolysis increases by 21. 13%. The degree of Ca2＋dispersion is the main factor which impacts char steam gasification rate. Furthermore,the reaction rate of char steam gasification with CaO additive has a positive correlation with Ca / C under the condition of Ca / C ≤1. 0,while there would be a decrease in char / CaO steam gasification rate when Ca / C increases to 1. 2,compared with the condition of Ca / C = 1. 0. Temperature plays a sufficient role on char / CaO steam gasification rate. When temperature increases from 650 ℃ to 750 ℃,the reaction rate of char / CaO steam gasification increases by 594. 67%. When steam partial pressure increases from 0. 35 MPa to 0. 50 MPa and 0. 65 MPa,the char / CaO steam gasification rates increases by 95. 86% and 204. 14%,respectively.

关 键 词：CAO 煤焦 直接制氢 煤气化 

分 类 号：TQ541[化学工程—煤化学工程]