带氧分布器的固定床反应器中甲烷-空气-水-二氧化碳制合成气

在带氧分布器的固定床反应器(FR-OD)中进行了Ni基催化剂上CH4-air-H2O-CO2三重整制合成气的研究。在分氧比为80%的条件下,考察了反应条件(压力、炉温、空速以及原料气CO2/CH4体积比)对催化剂床层温度分布和反应性能的影响,并进行了200h的寿命实验。结果表明,在压力为0.8MPa,出口温度为850℃,GHSV为13800h-1,原料气组成为V(CH4)/V(air)/V(H2O)/V(CO2)=1/2.4/0.8/0.4,分氧比为80%的条件下,催化剂床层入口处未出现热点,连续运行200h期间催化剂活性未见下降,以上结果初步表明采用氧分布器后的Ni基催化剂上可以较安全地进行甲烷三重整制合成气的操作。

Tri-reforming of methane with air,steam and carbon dioxide to synthesis gas in a fixed-bed reactor with an oxygen distributor

Tri-reforming of CH4 with air, H2O and CO2 to syn thesis gas employing Ni-based catalyst was studied in a fixed-bed reactor with an O2-distributor (FR-OD). The temperature profile of the catalyst bed and catalyst activity under different reaction parameters such as pressure, furn ace temperature, space velocity and CO2/CH4 molar ratio were in vestigated at distributed-O2 percen t (D value) of 80%. The 200 hours stability test for the catalyst was also carried out at reaction pressure of 0.8MPa, temperature of 850℃, volume space velocity of 13800h-1, CH4/air/H2O/CO2 volume ratio of 1∶2.4∶0.8∶0.4, D=80%, and the results showed that the hotspot near the entrance of the catalyst bed was elimin ated, and the catalyst main tained high activity and stability. These in dicated that tri-reforming of methane can be operated safely on the Ni-based catalyst in FR-OD.