A feasibility study for CO2 recycle assistance with coke oven gas to synthetic natural gas
A feasibility study for CO2 recycle assistance with coke oven gas to synthetic natural gas
复制标题
焦炉煤气辅助CO2回收制合成天然气的可行性研究
DOI：
10.1016/j.apenergy.2017.02.031
复制
发表时间：
2017
期刊：
影响因子：
11.2
通讯作者：
Li Wen-ying
中科院分区：
文献类型：
--
作者：
Yi Qun;Wu Guo-sheng;Gong Min-hui;Huang Yi;Feng Jie;Hao Yan-hong;Li Wen-ying
基于焦炉煤气制合成天然气的工业技术，提出了焦炉煤气辅助CO2循环制合成天然气的工艺流程，并进行了模拟和优化。研究了关键参数对系统性能的影响，确定了系统的最佳参数。焦炉气与从富CO2废气中分离出的再循环CO2反应，产生合成气，用于合成天然气生产。CO2循环利用可显著提高焦炉煤气中氢气的利用效率，既增加了合成天然气产量，提高了能源利用效率，又减少了CO2排放。计算结果表明，能量效率和火用效率（79.0%和81.1%）分别提高6.3和6.6个百分点，合成天然气生产成本降低0.05美元/m3，CO2直接排放量降低99.9%，合成天然气产量提高20%。该系统为今后焦炉气制合成天然气工艺的改进提供了一条有前途的途径，也可为焦化行业CO2的利用或减排提供指导。
Based on the industrial technology from coke oven gas to synthetic natural gas, a process of CO2recycle assistance with coke oven gas to synthetic natural gas is proposed, simulated, and optimized. The effects of key parameters on the performance of new system are investigated and the optimum parameters are determined. The coke oven gas reacts with the recycled CO2separated from the CO2-rich exhaust gas to produce syngas for synthetic natural gas production. This CO2recycle can significantly improve the hydrogen utilization efficiency in coke oven gas, which does not only increases the synthetic natural gas production and thus enhancing energy efficiency, but also reduces the CO2emission simultaneously. The results show that the energy and exergy efficiency (79.0% and 81.1%) of the new process is increased by 6.3 and 6.6 percent points, synthetic natural gas production cost and direct CO2emission reduced by 0.05 US$/m3and 99.9%, whereas the synthetic natural gas output increased by 20%, in comparison with the conventional coke oven gas to synthetic natural gas process. The proposed system provides a promising way for future improvements of coke oven gas to synthetic natural gas process, and can also be a guide for CO2utilization or CO2emission reduction in coking industry.