化工设计通讯

在“双碳”背景下，绿氨的产能正在迅速增加，但是风光资源的波动性在很大程度上制约了绿氨产业的发展。文章中提出了一种用于绿氨合成原料制/储的柔性工艺：在新能源发电高峰期，大规模电解制氢，并将部分氢气进行低温高压储存；在新能源发电低谷期，利用低温氢气与空气换热回收冷量，换热后氢气进入合成氨工段，空气进入空分系统。在ASPEN PLUS中，以“新能源大发”时的制氢规模为3 000 m³(标)/h对工艺进行流程模拟，模拟表明，该工艺能够稳定地为合成氨工段供应1 000 m³(标)/h的氢气与333.3 m³(标)/h的氮气，并充分利用生产过程中产生的冷量，提高了能源的利用率。

Under the dual-carbon policy backdrop, the production capacity of green ammonia is rapidly increasing. However, the inherent volatility of wind and solar resources significantly constrains the development of the green ammonia industry. This paper proposes a flexible process for the production and storage of feedstock for green ammonia synthesis. During periods of peak renewable energy generation, large-scale hydrogen production via electrolysis is conducted, with a portion of the hydrogen stored under cryogenic, high-pressure conditions. During troughs in renewable generation, the stored cryogenic hydrogen exchanges heat with air to recover its cold energy. The warmed hydrogen then enters the ammonia synthesis section, while the cooled air enters the air separation system. Using ASPEN PLUS, the process was simulated based on an electrolysis capacity of 3 000 m³(N)/h during high renewable output periods. The simulation demonstrates the process' s ability to stably supply the ammonia synthesis section with 1 000 m³(N)/h of hydrogen and 333.3 m³(N)/h of nitrogen. Crucially, it fully utilizes the cold energy generated during the process, significantly improving overall energy utilization efficiency.