Combined Heat and Power (CHP) system based on bio-energy is an energy-saving and environment friendly way to utilize energy, but in the background of the "carbon peaking and carbon neutrality" strategy, ensuring low-carbon operation of CHP systems becomes imperative. In this paper, we introduce two distinct CHP system scenarios based on post-combustion carbon capture technologies: a syngas-based gas turbine cycle CHP system (scenario 1) and a biogas-based steam turbine cycle CHP system (scenario 2). Then, a techno-economic evaluation has been conducted to investigate their performance under varying operational conditions of heating and power load, as well as carbon capture technology. The findings reveal that, given the same biomass input rate, the syngas-based CHP system yields superior energy and economic outcomes. To simultaneously mitigate CO emissions and reduce electricity costs, a process of multi-objective optimization is employed. This optimization endeavor also focuses on maximizing the overall exergy efficiency. Consequently, scenario 1 experiences substantial improvements in performance metrics. Notably, the overall energy and exergy efficiencies reach 17.32 % and 14.58 % respectively. Additionally, the power and heating load are estimated at 2.58 and 2.17 MW correspondingly. The levelized cost of electricity and heating are assessed at 30.55 USD/MWh and 36.05 USD/GJ, respectively, coinciding with a reduction in CO emissions to 98.27 kg/MWh.

中文翻译：

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两种情景对比多方面研究及碳捕获与利用技术集成生物质热电联产系统优化


基于生物能的热电联产系统是一种节能环保的能源利用方式，但在“碳达峰、碳中和”战略的背景下，保证热电联产系统的低碳运行成为问题至关重要的。在本文中，我们介绍了两种基于燃烧后碳捕获技术的不同热电联产系统方案：基于合成气的燃气轮机循环热电联产系统（方案1）和基于沼气的蒸汽轮机循环热电联产系统（方案2）。然后，进行了技术经济评估，以研究它们在不同供热和电力负荷运行条件下的性能以及碳捕获技术。研究结果表明，在相同的生物质输入率下，基于合成气的热电联产系统可产生卓越的能源和经济成果。为了同时减少二氧化碳排放和降低电力成本，采用了多目标优化过程。这种优化工作还侧重于最大化整体火用效率。因此，场景 1 的性能指标得到了显着改善。值得注意的是，整体能源效率和火用效率分别达到17.32%和14.58%。另外，预计电力和热负荷分别为2.58和2.17MW。电力和供暖的平准成本分别为 30.55 美元/兆瓦时和 36.05 美元/吉焦，二氧化碳排放量减少至 98.27 千克/兆瓦时。