Establishment of sustainable electric power supplement system by system design tool using EUD

在本研究中，我们提出了PEACE（和平东亚中心电力）网络，以稳定地供应电力在东亚地区。水力发电和低质量天然气被用作主要能源。采用电解水制取氢气，以劣质天然气和氢气为原料，通过催化反应制取二甲醚。二甲醚是一种能量传递材料，适合于远距离能量传递。为了建立PEACE网络，需要开发合理的二甲醚合成工艺。采用能量利用图法对传统的二甲醚合成系统（直接合成和甲醇脱水）进行了分析，并对这些系统的改进进行了探讨。在此基础上，提出了一种利用电解水产生的氢气和氧气合成二甲醚的新系统，其中甲醇脱水系统较为复杂，但在能量和效率上都有较大的提高 ...更多信息 RGY效率高于直接合成系统。这是因为碳转化率高于直接法。甲醇脱水系统优于直接合成系统。在此基础上，提出了一种新的具有高转化率的二甲醚合成系统，该系统将甲醇合成塔分为5个塔，并对各塔的压力和温度进行了优化。结果表明，碳转化率提高到99.5%，每生产1 mol二甲醚的火用损失降低到直接合成的60%和甲醇脱水系统的40%。化学链燃烧系统可以在不增加任何附加能量的情况下从出口气体中分离CO_2。在该系统中，使用两个反应器来进行燃烧。在还原反应器中，通过燃料气体进行金属的还原，并且在氧化反应器中通过空气进行还原的金属的氧化。采用Fe_2O_3-Al_2O_3复合粉末作为还原柱和氧化柱之间的传氧材料。通过对还原塔中混合粉气分离的改进，成功地获得了90%以上的高CO_2回收率。少

In this study, we proposed the PEACE (Peaceful East-Asia Centered Electricity) Network to supply the electricity stably in the East Asia region. Hydroelectric power and low quality natural gas was used as primary energy source. Hydrogen gas was produced by the electrolysis of water and DME (dimethylester) was produced by the catalytic reaction process with low quality natural gas and hydrogen gas. DME was used as an energy-transfer material, which is suitable for the long-distance transfer of energy. For the establishment of PEACE network, the development of reasonable DME synthesis process is required. The conventional DME synthesis systems (direct synthesis and methanol dehydration) were analyzed by EUD (Energy Utilization Diagram) method and the improvement of these systems was discussed. From these results, a new DME synthesis system using hydrogen and oxygen generated by the electrolysis of water was proposed.The methanol dehydration system was complicated, but both energy and exe … More rgy efficiencies were larger than those of direct synthesis system. This is because the carbon conversion yield is higher than that of direct method. The methanol dehydration system is more excellent than the direct synthesis system. From these results, we proposed a new DME synthesis system with high reaction conversion, in which the methanol synthesis column was divided to 5 columns and the pressure and temperature of these columns were optimized. As a result, the carbon conversion yield was increased to 99.5% and the exergy loss per 1mol DME production was reduced up to 60% of that for the direct synthesis and 40% of that for the methanol dehydration system.A chemical-looping combustor was developed and operated by a pilot-scale reactor. The chemical-looping combustion system can separate CO_2 from the outlet gas without any additional energy. In this system, two reactors are used to perform the combustion. In the reduction reactor, the reduction of metal by the fuel gas is performed, and the oxidation of the reduced metal by the air is performed in the oxidation reactor. A Fe_2O_3-AI_2O_3 composite powder is used as oxygen-transfer material between the reduction column and oxidation column. By the improvement of the separation of composite powder and gas in the reduction column, high CO_2 recovery more than 90% was attained successfully. Less