Research on the Performance of Supercritical CO2 Dry Gas Seal with Different Deep Spiral Groove

Du, Qiuwan; Zhang, Di

doi:10.1007/s11630-019-1139-z

Cited by 19 publications

(7 citation statements)

References 13 publications

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“…Their latest research demonstrated that reducing the surface area exposed to convective heat transfer effectively minimizes the distortion of a SCO 2 dry gas seal (Fairuz et al, 2019). In addition, SCO 2 dry gas seals were found to be much more sensitive to inlet conditions than air dry gas seals (Du et al, 2018;Du and Zhang, 2019). Comparative results of four types of shroud seals for a SCO 2 axial-flow turbine further proved that the dry gas seal could substantially improve the overall performance (Du et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of supercritical CO₂ dry gas seals with phase transitions

Zhang

Jiang²,

Peng³

2022

ILT

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Purpose This paper aims to acquire the phase distribution and sealing performance of supercritical carbon dioxide (SCO2) dry gas seals with phase transitions. Design/methodology/approach The SCO2 spiral groove dry gas seal is taken as the research object. The finite differential method is applied to solve the governing equations. Furthermore, the phase distribution and the sealing performance are obtained. Compared to the ideal gas model, the effect of phase transitions on sealing performance is also explored. Findings Vaporization is likely to occur near the inner radius when SCO2 dry gas seals are operated near the critical point. Whether phase transitions are considered in the model affects the sealing performance seriously. When phase transitions are considered, the sealing performance depends significantly on the working conditions, and unexpected results are produced when inlet conditions approach the critical point. Originality/value The numerical model for SCO2 dry gas seals with phase transitions is established. The phase distribution and the sealing performance of SCO2 dry gas seals are explored.

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Section: Introductionmentioning

confidence: 99%

Numerical analysis of supercritical CO₂ dry gas seals with phase transitions

Zhang

Jiang²,

Peng³

2022

ILT

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“…At present, a dry gas seal with small leakage is widely used in compressors and turbines as the shaft end seal of equipment. A lot of research work has been done on the structure and performance of dry gas seal. − …”

Section: Introductionmentioning

confidence: 99%

“…Zakariya and Jahn 19 investigated the supercritical CO 2 dry gas seals operating close to the critical point with an inlet pressure and temperature of 8.5 MPa and 370 K, respectively, and a speed of 30000 rpm and presented the effects of the groove length or dam to groove ratio on the performance of the dry gas seal. Du and Zhang 20 investigated the performance of supercritical CO 2 dry gas seal with a different deep spiral groove and found that SCO 2 DGS can generate larger average film pressure, open force, and leakage with lower average face temperature than air DGS. Fairuz Zakariya 21 optimized the face geometry for a small to median scale supercritical closed loop Brayton cycle (1–20 MWe).…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Rotor Cooling of Turbine in Supercritical Carbon Dioxide Cycle

et al. 2022

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The supercritical carbon dioxide cycle is a Brayton cycle with great application prospects. As a key equipment in this cycle, the turbine machinery usually adopts a dry gas seal as the sealing method between the cylinder and sliding bearing to reduce the leakage of carbon dioxide. In this paper, the numerical model of supercritical carbon dioxide turbine rotor cooling is established, and the grid independence is verified. The effects of inlet temperature and flow rate of dry gas seal and leakage flow rate from cylinder to dry gas seal at the high-temperature inlet side of a turbine upon rotor cooling are studied. The effects of inlet temperature T in and flow rate Q v of sealing gas in a dry gas seal and leakage mass flow rate Q m from a cylinder to dry gas seal on pressure loss, outlet flow distribution, exhaust temperature, and rotor temperature distribution are analyzed. As a result, it can be found that with the increase of the inlet flow rate of dry gas seal gas and the leakage flow rate from cylinder to dry gas seal, the pressure difference between the inlet and outlet of each seal gas increases. When the inlet flow rate of dry gas seal gas ranges from 300 N m3/h to 900 N m3/h, with the leakage flow from cylinder to dry gas seal increasing from 1.3 kg/s to 2.08 kg/s, the pressure difference between inlet and outlet of each seal gas increases by 7.9% to 13.4%. The pressure difference between the inlet and outlet of each seal gas decreases with the increase of the inlet temperature of dry gas seal gas. When the inlet flow rate of the seal gas of the dry gas seal is 300 N m3/h and the leakage flow rate from cylinder to dry gas seal is 2.08 kg/s, the inlet temperature of seal gas increases from 100 to 150 °C, and the flow distribution at the outlet is basically unchanged. The research provides theoretical reference for rotor cooling design of a supercritical carbon dioxide turbine.

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“…Fairuz's analysis [22,23] shows that, when the operating condition approaches the critical point of CO 2 , the temperature, pressure, and density distributions of gas film change by 6.7%, 6.5%, and 39.5%, respectively, compared with the ideal gas. Du's works [24,25] show that, compared with the air model in the supercritical zone, the opening force of the supercritical CO 2 model enhances by about 3.3%, and the leakage rate decreases by about 20% when the sealing temperature is 940 K. Zhu's research [26,27] demonstrates that the sealing property changes dramatically and the leakage rate increases about 4 times when the sealing temperature approaches the critical point of CO 2 . Moreover, Oike et al [28,29] investigated the effect of the two-phase flow caused by the decreasing pressure on the sealing performance of the floating-ring seals at Materials 2021, 14, 2873 2 of 13 low temperature, and the experimental results showed that the leakage rate first decreases and then increases with the increase of the two-phase flow area.…”

Section: Introductionmentioning

confidence: 99%

Thermoelastohydrodynamic Characteristics of Low-Temperature Helium Gas T-Groove Face Seals

2021

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Thermoelastohydrodynamic lubrication behaviors of helium gas T-groove face seals are numerically simulated under conditions of low temperature and high pressure, with the consideration of real-gas properties including compressibility coefficient, viscosity, and heat capacity. It is found that helium gas T-groove face seal presents a sharp divergent deformation at low temperature and high pressure, which makes the opening performance weaken and the leakage rate increase. This result is obviously different from the case of high-temperature gas face seals. As the sealing temperature drops from 300 K to 150 K, the leakage rate increases about 17% and the opening force decreases about 15%. Moreover, with the growth of rotational speed, both the outlet film pressure and the sealing performance present a non-monotonic trend. Specifically, while the rotating speed of moving ring raises from 3000 to 30,000 r·min−1, the leakage rate changes more than 30%, and the opening force is reduced about 10%.

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Research on the Performance of Supercritical CO2 Dry Gas Seal with Different Deep Spiral Groove

Cited by 19 publications

References 13 publications

Numerical analysis of supercritical CO₂ dry gas seals with phase transitions

Numerical analysis of supercritical CO₂ dry gas seals with phase transitions

Numerical Study on Rotor Cooling of Turbine in Supercritical Carbon Dioxide Cycle

Thermoelastohydrodynamic Characteristics of Low-Temperature Helium Gas T-Groove Face Seals

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Research on the Performance of Supercritical CO2 Dry Gas Seal with Different Deep Spiral Groove

Cited by 19 publications

References 13 publications

Numerical analysis of supercritical CO2 dry gas seals with phase transitions

Numerical analysis of supercritical CO2 dry gas seals with phase transitions

Numerical Study on Rotor Cooling of Turbine in Supercritical Carbon Dioxide Cycle

Thermoelastohydrodynamic Characteristics of Low-Temperature Helium Gas T-Groove Face Seals

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Numerical analysis of supercritical CO₂ dry gas seals with phase transitions

Numerical analysis of supercritical CO₂ dry gas seals with phase transitions