摘要
针对超临界二氧化碳压缩机在近临界工况的算法稳定性问题,该文提出一种实际气体多变功直接积分算法,将压缩过程分解为多个子过程并进行数值积分,得到压缩功的柯西数列,在子过程数量增大的过程中,可以得到精确的全过程压缩多变功。同时,为解决压缩机级间焓增分配问题,提出一种等比转速级间焓增分配算法。最后,给出超临界二氧化碳压缩机的热力设计流程。结果表明,相较于传统Schultz算法,研究提出的实际气体多变压缩功直接积分方法在近临界及超临界区域具有更好的稳定性和精确性,计算中只需要较少的子过程数即可将误差降至合格范围内。通过对50MW超临界二氧化碳发电机组主压缩机进行一维设计及流场模拟发现,提出的多变压缩功直接积分方法及压缩机设计方法可以对二氧化碳压缩机方案设计及性能预估起到重要的支撑作用。
To address the instability issues in design algorithm for supercritical carbon dioxide compressors near critical points,a stable direct integration algorithm for polytropic compression work considering real gas effect is proposed.By decomposing the compression process into multiple sub-processes and numerically integrating the polytropic compression work,the Cauchy point sequence of the entire polytropic compression work is obtained.By increasing the number of sub-processes,entire polytropic compression work of any precision can be obtained.Then,in order to solve the problem of enthalpy increase distribution between compressor stages,a stage enthalpy increase distribution algorithm based on equality of specific speeds is proposed.Finally,main design processes of the supercritical carbon dioxide compressor are also presented.It is found that,the proposed direct integration algorithm for polytropic compression work has better stability than the traditional Schultz algorithm in the near-critical and supercritical regions,with a calculation deviation of less than 1%from the theoretical solution.Meanwhile,a one-dimensional design and numerical simulation are carried out on the main compressor of a 50 MW supercritical carbon dioxide power generation unit.It is found that the method presented can strongly support scheme design and performance estimation of carbon dioxide compressors.
作者
李凯伦
李红智
张一帆
孙山
但光局
李扬
王亚
LI Kailun;LI Hongzhi;ZHANG Yifan;SUN Shan;DAN Guangju;LI Yang;WANG Ya(Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,Shaanxi Province,China;China Shipbuilding(ChongQing)Equipment Technology Co.,Ltd.,Jiangjin District,Chongqing 402263,China)
出处
《中国电机工程学报》
北大核心
2025年第14期5413-5421,I0007,共10页
PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING
基金
国家重点研发计划项目(2023YFB4102203)。
关键词
超临界二氧化碳发电
近临界工况二氧化碳压缩机
多变压缩功直接积分算法
supercritical carbon dioxide power generation
real gas compressor
direct integration algorithm of polytropic compression work
