超临界二氧化碳动静压干气密封稳态性能和加热模式对比研究  

Comparative study on steady performance and heating mode of supercritical CO_(2)hydrostatic-dynamic dry gas seal

作　　者：江锦波[1] 江鹏 彭旭东[1] 彭建 洪先志 唐大全 JIANG Jinbo;JIANG Peng;PENG Xudong;PENG Jian;HONG Xianzhi;TANG Daquan(Zhejiang University of Technology,Mechanical Engineering College,Hangzhou 310014,China;Chengdu Yitong Seal Co.,Ltd.,Chengdu 610100,China)

机构地区：[1]浙江工业大学机械工程学院,浙江杭州310014 [2]成都一通密封股份有限公司,四川成都610100

出　　处：《热力发电》2023年第11期46-56,共11页Thermal Power Generation

基　　金：国家自然科学基金项目(52075491,52076195);浙江省自然科学基金重大项目(LD21E050002)。

摘　　要：为提高现有超临界二氧化碳(S-CO_(2))动压型干气密封的气膜刚度和降低因密封进气管路上设置加热器而增加的额外功耗,提出一种基于静环背部环体加热的S-CO_(2)动静压型干气密封新结构。基于共轭热传递模型,采用商用软件Fluent求解密封压力场和温度场,对比分析了S-CO_(2)动压型、静压型和动静压型干气密封的稳态性能和流场分布,探讨了不同加热模式和热源温度下S-CO_(2)动静压型干气密封的流动传热特性和功率消耗。结果表明:在给定参数下,相较于动压型干气密封,动静压型干气密封的气膜刚度增加到2倍以上,不过泄漏率也增加了35%;相较于直接气体加热模式,环体加热模式下的加热功耗降低44%,密封运行经济性更好。这为S-CO_(2)发电系统压缩机端干气密封的结构设计和辅助系统改进提供了新的思路。For enhancing the film stiffness of supercritical CO_(2)(S-CO_(2))hydrodynamic dry gas seal and reducing the additional power consumption due to the installation of heater in the seal inlet line,a new structure of S-CO_(2)hydrostatic-dynamic dry gas seal with the heating of the ring body at the back of the static ring is proposed.Based on the conjugate heat transfer model,the pressure and temperature distribution of dry gas seal were simulated utilizing commercial software Fluent.The steady-state performance and flow field distribution of S-CO_(2)hydrodynamic seal,hydrostatic seal and hydrostatic-dynamic seal were compared and analyzed,and the flow and heat transfer characteristics and power consumption of S-CO_(2)hydrostatic-dynamic dry gas seals under different heating modes and heat temperatures were discussed.The results show that the film stiffness of the hydrostaticdynamic dry gas seal is improved more than doubled compared with the hydrodynamic dry gas seal,while the leakage rate increased significantly by 35%at the same time.The power consumption under ring heating mode is 44%lower than that under direct gas heating mode,leading to better operating economy.It provides a new idea for the structure design and auxiliary system improvement of compressor dry gas seal in S-CO_(2)power generation system.

关 键 词：超临界二氧化碳 干气密封 加热模式 气膜刚度 

分 类 号：TM61[电气工程—电力系统及自动化]