熔融法甲烷热裂解耦合化学链燃烧技术低碳联产工艺

Low-carbon co-production process of molten catalytic methane pyrolysis coupled with chemical looping combustion technology

关键词:  熔融催化  甲烷热裂解  耦合  化学链燃烧  碳材料  氢气

Key words:  molten catalytic  methane pyrolysis  coupling  chemical looping combustion  solid carbon  hydrogen

摘要:

目的 开发以天然气为原料的熔融法甲烷热裂解耦合化学链燃烧技术联产氢气、电、碳材料新工艺。方法 利用Aspen Plus对联产工艺进行建模计算，并从经济效益方面分析了技术经济可行性，以及讨论了热裂解反应甲烷转化率、热裂解反应温度和变压吸附分离效率等主要因素对系统的影响。结果 在600 kmol/h进料条件下，氢气和碳材料产量分别为956 kmol/h和503 kmol/h，系统发电量为9.43 MW，CO₂捕集量为208 kmol/h，捕集率达到99.75%。制氢效率、制碳材料效率和产电效率分别为41.059%、31.453%和4.532%，系统总效率达到77.044%。结论 提高甲烷转化率和变压吸附效率、降低热裂解反应温度有助于提高产品产量和系统总效率。

Abstract:

Objective Molten catalytic methane pyrolysis coupled with chemical looping combustion technology was developed, and natural gas was used as material gas. It can produce hydrogen along with power generation and solid carbon. Methods The process was simulated by Aspen Plus, and techno-economic feasibility in terms of economic benefits was analysed. The main influencing factors of methane conversion rate, pyrolysis reaction temperature, and PSA separation efficiency were discussed. Results When the feedstock was 600 kmol/h, the system could produce 956 kmol/h hydrogen and 503 kmol/h solid carbon, and the system generating capacity was 9.43 MW. The CO₂ capture amount was 208 kmol/h while the capture ratio was 99.75%. The system performance was examined, and the results showed that the total system efficiency was 77.044%, wherein the hydrogen efficiency was 41.059%, the rate of solid carbon production was 31.453%, and the electricity efficiency was 4.532%. Conclusion It was concluded that improving methane conversion and PSA efficiency, and reducing thermal cracking reaction temperature were significantly helpful in increasing product yield and total system efficiency.