Design and Investigations on Dry Gas Seal of the Shaft End for 450MWe Supercritical Carbon Dioxide Compressor

2021 ◽  
Author(s):  
Tao Yuan ◽  
Zhigang Li ◽  
Qi Yuan ◽  
Jun Li
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Dry Gas Seal ◽  
Supercritical Carbon

Design and Analysis of Cooling Structure for Dry Gas Seal Chamber of Supercritical Carbon Dioxide Turbine Shaft End

2021 ◽  
Author(s):  
Tao Yuan ◽  
Zhigang Li ◽  
Jun Li ◽  
Qi Yuan
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Structure Design ◽  
Inlet Temperature ◽  
Operation Condition ◽  
Operating Life ◽  
Dry Gas Seal ◽  
Rotational Components ◽  
Cooling Effects ◽  
Supercritical Carbon

Abstract Dry gas seal is a kind of non-contact mechanical seal that offers lower leakage and longer operating life comparing to conventional seals. Due to its low leakage rate, a dry gas seal is used to control the leakage flow through the clearance between the stationary and rotational components of Supercritical Carbon Dioxide (SCO2) turbomachinery, especially at the shaft end of the SCO2 compressor and turbine. However, the high inlet temperature of the SCO2 turbine makes the SCO2 dry gas seal face a severe operation condition. The chamber temperature, cooling effects, and the deformation of the rotating ring of a newly designed external flush structure are numerically investigated using the fluid-thermal-solid coupling approach in this paper. Within the same cooling flow rate, the current study analyzed the effect of six external flush cooling arrangements on these parameters. The obtained results demonstrate that the designed tangential admission cooling structure has the best cooling performance which can decrease the temperature by 400K in the film region and 440K in the chamber region. In addition, the deformation of the rotating ring decreases by 50% under this cooling structure by comparing the no cooling design. The present work provides the reference for the chamber cooling structure design of the SCO2 dry gas seal.

Design and Investigations on Dry Gas Seal of the Shaft End for 450MWe Supercritical Carbon Dioxide Compressor

2020 ◽  
Author(s):  
Tao Yuan ◽  
Zhigang Li ◽  
Jun Li ◽  
Qi Yuan
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Leakage Rate ◽  
Working Fluid ◽  
Leakage Flow ◽  
Dry Gas Seal ◽  
Sealing Performance ◽  
Rotational Components ◽  
Spiral Angle ◽  
Supercritical Carbon

Abstract The dry gas seal is a promising sealing technology to control the leakage flow through the clearance between the stationary and rotational components of Supercritical Carbon Dioxide (SCO2) turbomachinery. The dry gas seal is firstly designed for the SCO2 compressor shaft end of the GE’s 450MWe Brayton cycle power generation system. Then the effects of the spiral angle and gas film thickness on the designed dry gas seal performance are numerically investigated using the three-dimensional Reynolds-Averaged Navier-Stokes (RANS) and SST turbulence model. The accuracy of the numerical method is validated by comparison of the previous research data done by Gabriel et al. with air as the working fluid. The Current study analyzed the sealing performance parameters of the designed dry gas seal for SCO2 compressor shaft end at five gas film thicknesses and four spiral angles. These parameters include: opening force, leakage rate, stiffness, and opening force leakage ratio. Also, the impacts of the spiral angle on flow direction in the fluid film are analyzed. The obtained results show that the designed dry gas seal meets the requirement of the leakage flow rate of the SCO2 compressor shaft end. The dry gas seal with a spiral angle of 15° is the best solution due to its low leakage rate and its’ best comprehensive sealing performance. On some occasions where high stability is required, the dry gas seal with a spiral angle of 30° can be selected due to its’ highest film stiffness. The present work provides the reference of the dry gas seal design for the SCO2 compressor shaft end.

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