Pressure Swing Adsorption Process for Recovering H 2 from the Effluent Gas of a Melting Incinerator
Pressure Swing Adsorption Process for Recovering H 2 from the Effluent Gas of a Melting Incinerator
复制标题
从熔融焚烧炉废气中回收H 2 的变压吸附工艺
DOI：
10.1021/ie500091r
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发表时间：
2014
影响因子：
4.2
通讯作者：
Moon D
中科院分区：
文献类型：
--
作者：
Moon D
研究了活性炭双床变压吸附（PSA）工艺从尾气（H2/CO/CO2，39.3：35.4：25.3vol. %）中回收氢气的过程。一个熔化焚化过程。通过穿透实验研究了活性炭床层的吸附动力学。由于产品纯度的需求取决于焚烧炉现场的需求，各种PSA操作条件，如吹扫进料比（P/F），吸附（AD）步骤时间，吸附压力，和进料流量，进行了研究，以回收H2与广泛的纯度。纯度随P/F比而变化，回收率随AD步骤时间而渐近变化，因为通过H2产物吹扫的床净化接近极限。另一方面，纯度和回收率随P/F比、AD步骤时间和吸附压力的变化几乎是线性的或仅略微弯曲。纯度随进料流速的变化与P/F比的变化相似，而回收率趋势与AD步骤时间的变化更相似。由于CO和CO2的传播速度有很大的不同，因此CO传播对PSA性能的影响较大，但也要考虑CO2对床层的吸附热贡献。本研究中的PSA工艺生产的氢气纯度为75.43-99.99%，回收率为90.99- 49.29%。当需要合成气（H2和CO）时，PSA工艺可以导致高回收率和生产率，因为产品中的主要杂质是CO。
A two-bed pressure swing adsorption (PSA) process using activated carbon was studied to recover hydrogen from the effluent gas (H2/CO/CO2, 39.3:35.4:25.3 vol.%) of a melting incineration process. The adsorption dynamics of the activated carbon bed were investigated by breakthrough experiments. Since the product purity needs depend on demands of the incinerator site, various PSA operating conditions, such as purge to feed (P/F) ratio, adsorption (AD) step time, adsorption pressure, and feed flow rate, were investigated to recover H2with a wide range of purities. The purity varied with P/F ratio, and the recovery varied with AD step time asymptotically because bed purification by H2product purge approached a limitation. On the other hand, the variations in purity and recovery with P/F ratio, AD step time, and adsorption pressure were almost linear or only slightly curved. The variation in purity with feed flow rate was similar to the variation with P/F ratio while the recovery trend was more similar to the variation with the AD step time. Because the propagation velocity was significantly different for CO and CO2, the PSA performance was mainly affected by CO propagation, but the contribution of the CO2heat of adsorption to the bed should be considered. The PSA process in this study produced hydrogen with a purity of 75.43–99.99% and a recovery of 90.99–49.29%. When a syngas (H2and CO) is needed, the PSA process can result in high recovery and productivity because the major impurity in the product is CO.