多种构型超临界CO2循环热力学解构分析与参数优化
Thermodynamic Process Splitting Analysis and Parameter Optimization of Supercritical CO2 Cycles with Virous Configurations
张斌 1刘嘉楷 1张逸飞 2辛团团2
作者信息
- 1. 山东电力工程咨询院有限公司,山东 济南 250014
- 2. 华北电力大学能源动力与机械工程学院,北京 102206
- 折叠
摘要
新型超临界CO2(S-CO2)循环可通过流程改良提高效率,构型复杂多样.为了直观阐明各种流程改良措施对循环效率提升的作用机制,本文将预压缩、后压缩、再压缩、间冷、再热等五种构型的S-CO2循环解构为若干热功转换过程,建立各解构过程与循环效率之间的关联方程,进而开展流程参数优化.研究结果表明,预压缩、后压缩和再压缩方案均是通过增加压缩耗功,减少吸热量实现循环效率提升,其中再压缩方案效果最优,再压缩流量优化后循环效率提高 5.1%;采用部分间冷方案,可有效降低压缩功耗,同时避免高品位热量贬值,间冷压力优化后循环效率提高2.2%;再热方案在不改变压缩耗功的前提下,增加透平出功,再热压力优化后循环效率提高1.9%;最后,循环联用再压缩、间冷和再热三种节能措施,可使效率提高9.3%.
Abstract
The efficiency of novel supercritical CO2(S-CO2)cycles can be improved by process modifi-cation,making the configuration layout complex and diverse.To clearly explain the mechanism of process modification measures for the improvement of cycle efficiency,in this paper,five complex modified S-CO2 cycles,including pre-compression,post-compression,recompression,intercooling and reheat,are split into several heat-to-power conversion processes.Then,the correlation equations between the split processes and cycle efficiency are established to optimize the processes and parameters.Results show that the pre-compression,post-compression and recompression schemes increase the power con-sumption of compression and reduce the heat input for the cycle efficiency improvement.The recompres-sion scheme features the best performance and the cycle efficiency is increased by 5.1%points after opti-mizing the flow rate of recompressed stream.Moreover,adoption of the partial intercooling scheme can ef-fectively reduce the power consumption of compression and meanwhile avoid high-level heat degrading,and the cycle efficiency is increased by 2.2%points after the optimization of intercooling pressure.In addition,the reheat scheme increases the output power of turbine without changing the power consump-tion of compression and the efficiency of cycle is increased by 1.9%points after optimizing the reheat pressure.Finally,the combination of recompression,intercooling and reheat increases the cycle efficien-cy by 9.3%points.
关键词
超临界CO2循环/流程改良/热力学优化/过程解构分析/热功等效转换Key words
supercritical CO2 cycle/process modification/thermodynamic optimization/process splitting analysis/equivalent heat-to-power conversion引用本文复制引用
基金项目
国家自然科学基金青年科学基金项目(52306008)
出版年
2024
NETL
NSTL
万方数据