Power-to-gas is a pathway for the storage of intermittent renewable energy in a chemical form; energy surpluses can be exploited to produce hydrogen (via electrolysis) that can then react with carbon dioxide to produce synthetic methane by using catalytic cooled reactors. Methanation unit has been designed and optimized, defining the number of involved reactors, the number of parallel tubes for each reactor and the staged CO₂ injection to moderate the maximum temperature throughout the reactors. The produced synthetic natural gas (SNG) must have a methane content at least equal to 95 mol.-%, achieved by involving a series of 3 cooled reactors. Dynamic behavior of the as-designed system has been investigated for two cases that can occur when a power-to-gas system is operated intermittently: start-up from reactor hot standby and system operated at partial load. Methanation system requires about 130 s to reach the targeted methane content when it is started up from hot standby. In order to broaden the system rangeability (the minimum percentage of full load), different CO₂ staged injection should be carried out: part of carbon dioxide bypasses first and second reactor and it is directly conveyed to the third one.

天然气发电是以化学形式存储间歇性可再生能源的途径。可以利用剩余的能量来产生氢气（通过电解），然后可以通过使用催化冷却反应器与二氧化碳反应生成合成甲烷。甲烷化装置已经过设计和优化，可定义涉及的反应器数量，每个反应器的平行管数量以及分阶段的CO ₂注入以调节整个反应器的最高温度。所产生的合成天然气（SNG）必须具有甲烷含量至少等于95 mol。％，这是通过涉及一系列3个冷却反应器实现的。研究了设计的系统的动态行为，其中有两种情况在电力-燃气系统间歇运行时可能发生：从反应堆热备用启动和在部分负载下运行的系统。从热待机状态启动时，甲烷化系统需要约130秒才能达到目标甲烷含量。为了扩大系统的适用范围（满负荷的最小百分比），应执行不同的CO ₂阶段喷射：一部分二氧化碳绕过第一和第二反应器，然后直接输送到第三反应器。