A tremendous amount of livestock manure is produced every day, and its harmless and efficient utilization is of profound significance for environmental protection and alternative energy supply. Supercritical water gasification (SCWG) is an efficient and clean technology for high-moisture waste utilization. However, very few researchers have studied the SCWG of manure from system-level modeling. Here, an original or reference pig manure SCWG plant is established for power generation based on previous studies. Detailed exergy analysis shows that the most significant part of exergy destruction occurs in the recuperation process, accounting for 38.05% of total exergy loss. Then, several optimizations were made in a modified system, focusing on a better layout of heat exchangers and critical streams. The modified system had a substantial gain of 23% in overall exergy efficiency and produced 14.12 MW power at an electric efficiency of 27.7%, much higher than 2.08 MW and 5.07% in the original system. Sensitivity analysis further proves that increasing feedstock concentration, preheating temperature, and turbine parameters while decreasing the water-slurry ratio can increase total system efficiency. The efficient multi-stage heat exchanger network and steam turbine in this paper are preferred for SCWG of pig manure, considering system capacity, complexity, and zero-carbon emission.

每天产生大量的畜禽粪便，其无害高效利用对环境保护和替代能源供应具有深远意义。超临界水气化 (SCWG) 是一种高效清洁的高水分废物利用技术。然而，很少有研究人员从系统级建模研究粪便的 SCWG。在这里，根据先前的研究，建立了原始或参考猪粪 SCWG 工厂用于发电。详细的火用分析表明，火用破坏最显着的部分发生在恢复过程中，占总火用损失的38.05%。然后，在修改后的系统中进行了多项优化，重点是优化换热器和关键流的布局。修改后的系统在整体火用效率方面大幅提高了 23%，并以 27.7% 的电效率产生了 14.12 MW 的功率，远高于原始系统的 2.08 MW 和 5.07%。敏感性分析进一步证明，在降低水浆比的同时提高原料浓度、预热温度和涡轮机参数可以提高总系统效率。考虑到系统容量、复杂性和零碳排放，本文中的高效多级换热器网络和汽轮机是猪粪 SCWG 的首选。和涡轮机参数同时降低水浆比可以提高总系统效率。考虑到系统容量、复杂性和零碳排放，本文中的高效多级换热器网络和汽轮机是猪粪 SCWG 的首选。和涡轮机参数同时降低水浆比可以提高总系统效率。考虑到系统容量、复杂性和零碳排放，本文中的高效多级换热器网络和汽轮机是猪粪 SCWG 的首选。