More than 50% energy input of coal-fired power plant is lost in the condensation of steam turbine in a temperature range of 30–35 ℃. Carbon capture technology has a negative influence on power generation efficiency of coal-fired power plant. Thus, it is essential to find an efficient method for waste heat recovery and increase the overall energy efficiency in coal-fired power plant with carbon capture. A novel integrated system including absorption heat pump and adsorption carbon capture based on coal-fired power plant is then presented. Waste heat from steam condenser is recovered by absorption heat pumps driven by steam extracted from low pressure steam turbine. The output hot medium from the absorption heat pumps is further heated to desorption temperature for the regeneration process of adsorbents by the extracted steam. The results show that heat penalty increases with the increase of the desorption temperature, and the heat recovery amount has an opposite trend. Compared with the conventional coal-fired power plant, thermal efficiency of the integrated system increases by 0.854%. The efficiency decrease of the compression work accounts for over a half of the total efficiency decrease due to the compression and the capture process. External heat recovery is applied in flue gas and the multi-compression process, and the thermal efficiency increase can be improved to 1.453% when compared with 0.725% of the system without external heat recovery. It proves that absorption heat pump could play a significant role in the energy saving of adsorption carbon capture system.

中文翻译：

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脱碳燃煤发电厂中热泵辅助吸附碳捕集与蒸汽冷凝器热回收


燃煤电厂50%以上的能量输入在30~35℃的温度范围内损失在汽轮机的凝结中。碳捕集技术对燃煤电厂的发电效率产生负面影响。因此，有必要找到一种有效的余热回收方法，通过碳捕获提高燃煤电厂的整体能源效率。然后提出了一种基于燃煤电厂的吸收式热泵和吸附式碳捕集的新型集成系统。蒸汽冷凝器的废热由低压汽轮机抽取的蒸汽驱动的吸收式热泵回收。吸收式热泵输出的热介质被抽取的蒸汽进一步加热至解吸温度，用于吸附剂的再生过程。结果表明，随着解吸温度的升高，热损失增大，而热回收量则呈现相反的趋势。与传统燃煤电厂相比，集成系统热效率提高0.854%。压缩功的效率下降占压缩和捕获过程导致的总效率下降的一半以上。在烟气和多重压缩过程中应用外热回收，与无外热回收系统的0.725%相比，热效率提升可提高至1.453%。证明吸收式热泵对吸附碳捕集系统的节能可以起到显着的作用。