选取MDEA-PZ二元复配胺液为吸收剂,建立低浓度烟气碳捕集的工艺计算模型。根据模拟计算,分析了影响MDEA-PZ二元复配体系的胺液配比、烟气入塔温度、贫液温度、气液比等影响碳捕集过程和能耗的关键因素,在此基础上通过集成吸收塔级间冷却工艺、MVR热泵工艺进行节能优化,级间冷却+MVR热泵工艺的系统能耗较典型工艺系统单位碳捕集能耗降低了16.7%;最后,分析了碳捕集系统可高效回收余热的点位,考虑节能工艺集成与余热回收的工艺系统,单位碳捕集能耗降低了33.63%。研究结果证明,通过多种节能工艺耦合与系统内烟气、CO₂余热回收集成低能耗碳捕集系统,是降低碳捕集单位能耗的有效途径。

Selecting MDEA-PZ binary blended amine solution as the absorbent,a process calculation model for low-concentration flue gas carbon capture was established.According to simulation calculations,the key factors affecting the carbon capture process and energy consumption,such as the amine solution ratio in the MDEA-PZ binary blended system,flue gas inlet temperature,lean solution temperature,and gas-liquid ratio,were analyzed.On this basis,process optimization was carried out by integrating inter-stage cooling and MVR heat pump processes with the absorption column.The unit carbon capture energy consumption of the inter-stage cooling MVR heat pump process was reduced by 16.7% compared to the typical process system.The key units for recoverable residual heat during the process were analyzed,and the energy consumption per unit of carbon capture was reduced by 33.63%.The research results demonstrate that integrating energy-saving processes with flue gas and CO₂ residual heat recovery is an effective way to reduce the unit energy consumption of carbon capture systems.