Numerical study on sealing performance of supercritical carbon dioxide compressor dry gas seal

Zhao, Xufeng; Zhao, Zhenxing; Dai, Lu; Lao, Xingsheng; Lv, Weijian

doi:10.1088/1755-1315/461/1/012046

Cited by 1 publication

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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%

“…Muhammad et al 17 proposed a new barrier gas method to reduce the power associated with the leakage supplement system for the sCO 2 turbine and reduced the leakage flow rate from the turbine. Wu et al 18 studied the sealing characteristics of the single-stage spiral groove dry gas seal in the SCO 2 operating environment and found that the dry gas seal leakage flow rate under different film thicknesses is 0.04% to 0.45% of the SCO 2 compressor flow rate. 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.…”

Section: Introductionmentioning

confidence: 99%

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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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