Comparative study on steady performance and heating mode of supercritical CO<sub>2</sub> hydrostatic-dynamic dry gas seal

JIANG Jinbo; JIANG Peng; PENG Xudong; PENG Jian; HONG Xianzhi; TANG Daquan

doi:10.19666/j.rlfd.202302013

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Comparative study on steady performance and heating mode of supercritical CO₂ hydrostatic-dynamic dry gas seal

更新时间：2025-09-28

- Comparative study on steady performance and heating mode of supercritical CO₂ hydrostatic-dynamic dry gas seal
- Thermal Power Generation Vol. 52, Issue 11, Pages: 46-56(2023)
- 作者机构：
  
  1. 浙江工业大学机械工程学院
  2. 成都一通密封股份有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202302013
  CLC： TM61
- Published：2023
- 稿件说明：
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JIANG Jinbo, JIANG Peng, PENG Xudong, et al. Comparative study on steady performance and heating mode of supercritical CO₂ hydrostatic-dynamic dry gas seal[J]. Thermal power generation, 2023, 52(11): 46-56.
DOI：

JIANG Jinbo, JIANG Peng, PENG Xudong, et al. Comparative study on steady performance and heating mode of supercritical CO₂ hydrostatic-dynamic dry gas seal[J]. Thermal power generation, 2023, 52(11): 46-56. DOI： 10.19666/j.rlfd.202302013.

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。

Abstract

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.

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Comparative study on steady performance and heating mode of supercritical CO2 hydrostatic-dynamic dry gas seal

DOI：10.19666/j.rlfd.202302013

摘要

Abstract

关键词

Keywords

references

Comparative study on steady performance and heating mode of supercritical CO₂ hydrostatic-dynamic dry gas seal