Turbine shaft-end seal device applied to Kalina power circulating system

Abstract

The invention provides a turbine shaft-end seal device applied to a Kalina power circulating system. The device comprises a spiral seal system and a water seal system, wherein the spiral seal system comprises a spiral shaft sleeve, a stationary sleeve, a leak collecting cavity, a seal cavity and a mechanical seal; the spiral shaft sleeve is embedded onto the main shaft of a Kalina power circulating turbine, the stationary sleeve and the spiral shaft sleeve are arranged in a spaced manner at the same end of the main shaft in a sleeving manner to form the spiral seal, the seal end of the stationary shaft and the end part of the main shaft form a sealed cavity, the open end of the stationary sleeve and the main shaft form a cavity as the leak collecting cavity, and the mechanical seal arranged between the stationary sleeve and the main shaft is located in the leak collecting cavity; when the main shaft rotates, the spiral shaft sleeve rotates to pressurize the seal cavity; the water sealsystem comprises a pressurizing pump, an adjusting valve and a water tank; the input end of the water tank communicates to the leak collecting cavity while the output end of the water tank communicates to the tail end of the gap between he spiral shaft sleeve and the stationary sleeve successively through a pressurizing pump and the adjusting valve. Through three seals: the mechanical seal, the water seal and the spiral seal, the problem of corrosion caused by contact of ammonia-enriched steam and the mechanical structure is avoided.

Description

technical field [0001] The invention relates to a Karina power cycle system, in particular to a turbine shaft end sealing device applied to the Karina power cycle system. Background technique [0002] Kalina's low-grade heat source power generation system uses ammonia-water mixture instead of traditional water or steam as a circulating working medium to convert low-grade heat energy into high-grade electric energy. Karina low-grade heat source power generation system is mainly composed of evaporator, separator, turbine, generator, condenser and booster pump. [0003] At present, a major factor limiting the promotion of the Karina cycle power generation technology is the leakage of its working fluid. Ammonia water is toxic, corrosive, and highly volatile. Once leaked, it will greatly affect the safety of the system. Therefore, the Karina power cycle has very strict requirements on the seal: it can maintain a low leakage or even zero leakage and a longer service life. Tradi...

AI Technical Summary

Problems solved by technology

During the actual operation of the Karina power cycle system, the screw seal cannot track the pressure change in the cylinder due to the variable operating conditions of the turbine

Due to the influence of working conditions and other factors, the screw seal will reduce its sealing ability or even fail, resulting in the leakage of ammonia working fluid and causing economic losses and environmental pollution.

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