A shaft sealing device for a high speed turbine-generator used in orc

Abstract

The invention discloses a main shaft sealing device of a high-speed turbine-generator applied to an ORC (organic Rankine cycle). The main shaft sealing device is characterized by comprising a high-speed turbine expander, a high-speed generator, a fastening bolt, a high-speed shaft seal and an air sealing and cooling system, wherein the high-speed shaft seal is arranged on a main shaft on one side of the impeller back of an impeller of the high-speed turbine expander, and the steam leakage of an organic working medium is reduced through contact sealing; according to a core technology adopted by the air sealing and cooling system, a high-pressure air chamber is built on the back side of the high-speed shaft seal, and the pressure of the high-pressure air chamber is regulated through a pressure relief valve; the air pressure of the high-pressure air chamber supplies back pressure to the high-speed shaft seal, and the high-pressure air chamber has an air sealing function; air flowing in the high-pressure air chamber can be used for cooling the high-speed shaft seal and taking away a trace amount of leakage from the high-speed shaft seal. According to the main shaft sealing device, the problems of low thermal safety, over-large ventilation loss and friction loss and the like of the high-speed generator caused by blow-by of the main shaft can be solved.

Description

technical field [0001] The invention belongs to the technical field of waste heat energy of internal combustion engines, and in particular relates to a high-speed turbine-generator shaft sealing device applied to ORC (Organic Rankine Cycle). Background technique [0002] According to the energy balance analysis of the internal combustion engine, at present, only about one-third of the energy released by the fuel combustion of the internal combustion engine is effectively used, and the rest of the energy is eventually dissipated into the atmosphere in the form of waste heat. Therefore, the waste heat of the internal combustion engine can be effectively recovered and Utilization is an important way to further improve the efficiency of internal combustion engines, reduce carbon dioxide emissions, and realize low-carbon internal combustion engines. [0003] Based on the recovery and utilization of waste heat energy of internal combustion engines to reduce oil consumption and red...

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Problems solved by technology

[0010] Aiming at the application problem of the high-speed turbine-generator applied to the ORC, which has the main shaft leakage and gas leakage, the present invention provides a high-speed turbine-generator shaft sealing device applied to the ORC, which solves the technical difficulty of the main shaft gas leakage, thereby Inhibit the leakage of organic working medium vapor along the main shaft into the cavity of the high-speed generator, improving the efficiency and thermal safety performance of the generator

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