碳捕集技术能效极限的模型与案例分析

Models and cases of energy efficiency limit of carbon capture technology

能效评价模型和指标的建立有助于推动碳捕集技术节能降耗工作的深化。以碳捕集技术的能效极限为研究对象,基于有限质容和无限质容化学泵模型提出了适用的计算方法,并以凝华法捕集为典型对象展开了案例研究。结果表明:尽管分离模型和有限质容化学泵模型提出的背景和图像不同,但两者在热力学近理想意义上呈现一致,其理论极限能耗计算值相等,且数值大于无限质容化学泵模型(即理想模型)的计算结果。这证明了将分离模型用于碳捕集理想能耗值测算会计及源汇两侧的不可逆性,与探索理想性能“天花板”所对应的物理化学情景并不严格相符。

The proposal of models and indicators for energy-efficient evaluation is helpful for the development of energy-saving method of carbon capture technology.In this work,the limit of energy efficiency of carbon capture technology was researched based on the finite-capacity and infinite-capacity chemical pump models,which was also calculated in a case study.The results indicate that the separation model and the finite-capacity chemical pump model show no difference in the view of thermodynamic ideal approach,which with totally different application background though,and the theoretical limit of energy efficiency calculated is also the same.And the separation model was also proved less ideal than the infinite-capacity chemical pump model.