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The effect of low temperature on the performance of BOG twin-screw compressor.

Number: 1190

Author(s) : ZHOU Y., GUO Y., WANG Y., DIAO A., PENG X.

Summary

The generation of boil-off gas (BOG) is a problem that must be solved during liquid natural gas (LNG) transportation. The dry twin-screw compressor is used for BOG recovery to ensure the purity of the gas, but the efficiency of the dry compressor is more sensitive to leakage clearance. To investigate the effect of rotor deformation on clearance and efficiency under low-temperature working conditions. This paper simulated the working process of the BOG twin-screw compressor based on the thermal-fluid-structure coupling method so that the rotor deformation could be fully considered. It found a temperature difference between the rotors, and the temperature of the male rotor was higher. Besides, when the suction temperature is -30℃, the rotors contract near the suction while expanding on the discharge side, which makes the efficiency of the compressor not significantly change. The volumetric efficiency of the operating model is 1.26% lower, while the isentropic efficiency of the operating model is 0.41% smaller than the start-up model. When the suction temperature of the compressor is -10℃, the volumetric efficiency of the compressor after stable operation increases by 3.77% compared with that at start-up, and the isentropic efficiency is increased by 5%. When the suction temperature is reduced to -50℃, the volumetric efficiency and isentropic efficiency are reduced by 9.25% and 8.25% after stable operation, respectively.

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  • Original title: The effect of low temperature on the performance of BOG twin-screw compressor.
  • Record ID : 30033162
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 27th International Compressor Engineering Conference at Purdue.
  • Publication date: 2024/07/18

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