Novel power-to-syngas concept for plasma catalytic reforming coupled with water electrolysis
Novel power-to-syngas concept for plasma catalytic reforming coupled with water electrolysis
复制标题
用于等离子体催化重整与水电解耦合的新型电力合成气概念
DOI：
10.1016/j.cej.2018.07.111
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发表时间：
2018
影响因子：
15.1
通讯作者：
Zhu Ai Min
中科院分区：
文献类型：
--
作者：
Li Kai;Liu Jing Lin;Li Xiao Song;Lian Hao Yu;Zhu Xiaobing;Bogaerts Annemie;Zhu Ai Min
我们提出了一种新的电力合成气（P2SG）方法，该方法由两个高效的可再生电力驱动装置组成，即等离子体催化重整（PCR）和水电解（We），以CH4， co2和H2O为原料生产高质量的合成气。由于WE技术已经商业化，我们主要研究由滑动电弧等离子体和镍基催化剂组成的用于甲烷氧化干重整的PCR装置。在ch4转化率为99%，co2转化率为79%的情况下，能源效率为78.9%，能源成本为1.0 kWh/ nm3。考虑到WE的能源效率为80%，P2SG系统的总能源效率为79.3%，能源成本为1.8 kWh/Nm3。高质量的合成气不需要后处理装置，具有理想的化学计量数2，浓度为94.6 vol%，甲醇合成所需的co2分数为1.9 vol%。与传统催化工艺相比，PCR装置具有响应快、适应可再生电力波动、避免催化剂床内局部热点和结焦等优点。此外，来自WE装置的纯o2直接由PCR装置用于甲烷的氧化干重整，因此不需要像传统工艺那样需要空气分离装置。这项工作证明了P2SG方法通过电力到燃料的转换来大规模存储可再生电力的可行性。
We propose a novel Power to Synthesis Gas (P2SG) approach, composed of two high-efficiency and renewable electricity-driven units, i.e., plasma catalytic reforming (PCR) and water electrolysis (WE), to produce high-quality syngas from CH4, CO2and H2O. As WE technology is already commercial, we mainly focus on the PCR unit, consisting of gliding arc plasma and Ni-based catalyst, for oxidative dry reforming of methane. An energy efficiency of 78.9% and energy cost of 1.0 kWh/Nm3at a CH4conversion of 99% and a CO2conversion of 79% are obtained. Considering an energy efficiency of 80% for WE, the P2SG system yields an overall energy efficiency of 79.3% and energy cost of 1.8 kWh/Nm3. High-quality syngas is produced without the need for post-treatment units, featuring the ideal stoichiometric number of 2, with concentration of 94.6 vol%, and a desired CO2fraction of 1.9 vol% for methanol synthesis. The PCR unit has the advantage of fast response to adapting to fluctuation of renewable electricity, avoiding local hot spots in the catalyst bed and coking, in contrast to conventional catalytic processes. Moreover, pure O2from the WE unit is directly utilized by the PCR unit for oxidative dry reforming of methane, and thus, no air separation unit, like in conventional processes, is required. This work demonstrates the viability of the P2SG approach for large-scale energy storage of renewable electricity via electricity-to-fuel conversion.