【作者】 姜炜； 程乐明； 张荣； 毕继诚；

【Author】 JIANG Wei, CHENG Le-ming, ZHANG Rong, BI Ji-cheng (State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;Graduate School of the Chinese Academy of Sciences, Beijing 100039, China)

【机构】 中国科学院山西煤炭化学研究所煤转化国家重点实验室；

【摘要】 利用小型间歇超临界水反应器,在温度650℃、压力30 MPa和停留时间5 min的条件下,考察了Ca基吸收剂再生-吸附次数对小龙潭褐煤制氢过程的影响。结果表明,Ca／C摩尔比为0．42时,循环使用5次后气相中 CO2含量由4．7％增至16．6％,H2产率由373．7 mL／g降至295．4 mL／g,CaO的利用率由76．4％降至55．8％。 Ca／C摩尔比提高到0．7时,CO2趋于完全固定,随着循环次数的增加气相产物的组成和产率变化不大,循环使用7 次后,H2含量维持在55％左右,CaO利用率保持在50％左右。在Ca／C摩尔比为0．42时,采用粒径小于75μm的细粒径CaO,初次使用时CaO利用率为82．9％,H2产率为429 mL/g,循环使用5次后CaO利用率为72％,H2产率为341 mL／g。考虑到提高Ca／C摩尔比会限制煤的处理量,降低CaO的粒径可能是保持CaO吸附性能和催化活性的选择之一。更多还原

【Abstract】 The effects of the regeneration-adsorption cycles of CaO on the process of hydrogen production from Xiao-longtan lignite were investigated under the conditions of 650 ℃, 30 MPa and 5 min. At a Ca/C molar ratio of 0.42, after five cycles, the CO2 content increases from 4.7% to 16. 6% , the yield of H2 decreases from 373. 7 mL/g to 295. 4 mL/g. When the Ca/C molar ratio increases to 0.7, nearly all CO2 is fixed. The H2 content and the utilization of CaO keep at -55% and -50% , respectively, after seven cycles. The utilization ratio of CaO with particle size less than 75 μm decreases from 82. 9 % to 72 % after five cycles at a Ca/C molar ratio of 0. 42. Take the efficiency of carbon conversion into consideration, the reducing of the particle size of CaO is an alternative method to ensure both of the adsorption capability and catalysis activity.更多还原