Calculation of Heat Transfer Performance of Steam Turbine Shaft Sealing Heater

doi:10.12096/j.2096-4528.pgt.23028

Abstract

Abstract:

The shaft seal heater is a heat exchange device in a steam turbine, which plays an important role to the performance of the shaft seal system. Based on limited data, a method for calculating the relevant parameters of the shaft seal heater was proposed by using an iterative algorithm. The algorithm was validated by comparing the calculated basic heat transfer parameters of the shaft seal heater with the results from Aspen Plus software. The discrepancy is within 0.4%, which validates the iterative algorithm presented in this paper. Taking the practical application of the combined cycle steam turbine unit of Huaneng Beijing Thermal Power Co., Ltd. as an example, the liquid phase and gas phase flow at the outlet of the shell side, under the condtion of inlet parameter change, were calculated by using this method. Moreover, the correlation model between the fluctuation of import parameters and the heat transfer parameters of the heater was established to verify the effectiveness of the method.

Key words: steam turbine, sealing heater, import parameters, iterative calculation, correlation model

CLC Number:

TK 26

Yanfang LIANG, Shuxuan PENG, Yongjun CUI, Jianchao LUO, Yaonian HE, Linchao BAI, Jinglun FU. Calculation of Heat Transfer Performance of Steam Turbine Shaft Sealing Heater[J]. Power Generation Technology, 2023, 44(6): 817-823.

Figures/Tables 7

Fig. 1 Structure diagram of shell and tube heat exchanger

Fig. 2 Flow chart of shaft addition calculation after the change of inlet parameters

Fig. 3 Variation of shell process flow rate for different mass fractions of steam inlet to the shell process for a given total heat exchange

Fig. 4 Schematic diagram of shaft seal system and shaft seal structure

Fig. 5 Diagram of shaft seal overflow transformation

Fig. 6 When the inlet parameters change, the mass fraction of inlet steam on the shell side and the liquid phase flow rate at the outlet of the shell side change

Fig. 7 When the inlet parameters change, the mass fraction of inlet steam on the shell side and the gas phase flow rate at the outlet of the shell side change

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