Abstract A novel waste incineration power system highly integrated with a supercritical CO2 power cycle and a coal-fired power plant has been developed. In the hybrid configuration, the supercritical CO2 cycle gains energy from the superheater of the waste-to-energy (WTE) boiler, and the saturated steam produced by the WTE boiler is employed to heat the feedwater of the coal power plant. Consequently, the cascade energy utilization of the waste can be realized with the improvement of the WTE process. The performance of the proposed integrated scheme was thermodynamically and economically evaluated as compared to the conventional separate scheme, based on a 500 t/d incineration unit and a 300 MW coal power plant. The results indicate that the waste-to-electricity efficiency is promoted by 8.34 percentage points with an additional net power output of 3.33 MW, when adopting the proposal. The total exergy efficiency and the exergy efficiency of waste-to-electricity are increased by 0.43 and 7.88 percentage points. Additionally, the proposed system performs excellently under various boiler loads. Due to the integration, the net present value of the WTE project rises by 18.17 M$ and the dynamic payback period is reduced by 4.20 years. Therefore, the new design is extremely feasible and profitable.

中文翻译：

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结合超临界CO2动力循环和燃煤电厂的新型垃圾焚烧发电系统设计与性能评价

摘要 开发了一种新型的垃圾焚烧发电系统，与超临界二氧化碳发电循环和燃煤电厂高度集成。在混合配置中，超临界 CO2 循环从垃圾发电 (WTE) 锅炉的过热器获取能量，并利用 WTE 锅炉产生的饱和蒸汽加热燃煤电厂的给水。因此，随着垃圾焚烧发电工艺的改进，可以实现垃圾的梯级能源利用。与传统的单独方案相比，基于 500 t/d 焚烧装置和 300 MW 燃煤电厂，对提议的综合方案的性能进行了热力学和经济评估。结果表明，垃圾发电效率提高了8。通过该提案时，增加 34 个百分点，额外的净功率输出为 3.33 兆瓦。总火用效率和垃圾发电火用效率分别提高0.43和7.88个百分点。此外，所提出的系统在各种锅炉负载下都表现出色。由于整合，垃圾焚烧发电项目净现值增加1817万美元，动态投资回收期减少4.20年。因此，新设计非常可行且有利可图。17 M$，动态投资回收期减少了 4.20 年。因此，新设计非常可行且有利可图。17 M$，动态投资回收期减少了 4.20 年。因此，新设计非常可行且有利可图。