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| 结构型载氧体固定床化学链重整制氢的实验研究 |
| Experimental study on chemical looping reforming for hydrogen production in fixed bed reactors with structured oxygen carriers |
| 投稿时间：2020-05-08 |
| DOI：10.13259/j.cnki.eri.2022.02.003 |
| 中文关键词: 载氧体 固定床 化学链重整 制氢 甲烷 |
| 英文关键词:oxygen carriers fixed bed chemical looping reforming hydrogen production methane |
| 基金项目: |
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| 中文摘要: |
| 采用浸渍法制备球形与拉西环形两种不同结构型Ni基载氧体，用于甲烷化学链重整制氢反应。在固定床中考察反应温度、进气水碳物质的量的比和空速对载氧体活性及稳定性的影响，并对比研究两种不同结构型载氧体的性能。结果表明：两种载氧体均可以保持较好的活性，相对而言球形载氧体更易积碳。在800 ℃以上时两种载氧体均具有较高的甲烷转化率及产物选择性，拉西环形载氧体在高温下性能下降得较慢。过高的水碳物质的量的比会抑制重整反应的进行，但拉西环形载氧体在高水碳物质的量的比下仍能保持较高的产物选择性。随着空速的增大，拉西环形载氧体的甲烷转化率降低，而对球形载氧体来说，当空速在3 500 h?1左右时甲烷转化率和氢气产率均最高。经过20次循环稳定性测试，两种载氧体颗粒均出现了不同程度的积碳烧结，其中拉西环形载氧体结构保持得较好，积碳在氧化阶段能被部分清除。 |
| 英文摘要: |
| Two different types of Ni-based oxygen carriers (OCs) such as sphere and Raschig ring have been prepared with impregnation method, which were used in the methane chemical looping reforming. Reaction activity and stability of two OCs were tested in a fixed bed reactor, and the effects of reaction temperature, water/carbon molar ratio, and gas hourly space velocity on the reaction performance were also investigated. The results showed that both oxygen carriers exhibited good reaction activity, although more carbon deposit was observed on the spherical oxygen carriers. Both spherical and Raschig-ring OCs had higher methane conversion rate and selectivity above 800 ℃. And at higher temperature, the performance of Raschig ring OCs decreased slowly. It was also found that excessively high water/carbon molar ratio could inhibit the reforming reaction, while Raschig-ring OCs maintained higher product selectivity at the same time. With the increase of gas hourly space velocity, the methane conversion rate for Raschig ring OC decreased, but the best performance of spherical OCs existed at the gas hourly space velocity of 3 500 h−1. After 20 cycles of stability test, carbon deposition and sintering at different levels was observed on both OCs. Raschig ring OCs had better resistant to carbon deposits owing to partial removal during the oxidation stage. |
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