Adjusting system for axial thrust of steam turbine under variable working conditions and using method of adjusting system

Abstract

The invention belongs to the technical field of combined heat and power generation steam turbine power generation, and particularly relates to an adjusting system for axial thrust of a steam turbine under variable working conditions and a using method of adjusting system. According to the technical scheme, the adjusting system for the axial thrust of the steam turbine under variable working conditions comprises a steam turbine, a balance disc is installed on a rotor of the steam turbine, and a thrust bearing is connected to a stator of the steam turbine. The steam turbine is provided with a first steam extraction opening and a second steam extraction opening, the first steam extraction opening and the second steam extraction opening are connected with the balance disc through pipelines correspondingly, and the distance between the first steam extraction opening and a steam inlet of the steam turbine is smaller than the distance between the second steam extraction opening and the steaminlet of the steam turbine. A first adjusting valve is connected to the pipeline between the first steam extraction opening and the balance disc, and a second adjusting valve is connected to the pipeline between the second steam extraction opening and the balance disc. According to the adjusting system and the using method thereof, the stress condition of the thrust bearing can be changed under the variable working condition of a steam turbine mechanism so as to guarantee the control allowable range of the resultant force borne by the thrust bearing.

Description

technical field [0001] The invention belongs to the technical field of cogeneration steam turbine power generation, and in particular relates to an axial thrust adjustment system of a steam turbine under variable working conditions and a use method thereof. Background technique [0002] Combined heat and power steam turbines are mostly used in industrial production occasions such as chemical industry, papermaking, and pharmaceuticals. Their operating conditions mainly depend on the requirements of electrical load and thermal load. Conditions may also have many changes or special requirements, forming more complex variable working conditions. [0003] The complex conditions of changing working conditions will cause complex changes in the axial thrust of the unit. Under extreme conditions, there will be a problem that the axial thrust of two or more working conditions cannot be coordinated, resulting in the thrust bearing on the steam turbine stator. The resultant force excee...

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Problems solved by technology

[0002] Combined heat and power steam turbines are mostly used in industrial production occasions such as chemical industry, papermaking, and pharmaceuticals. Their operating conditions mainly depend on the requirements of electrical load and thermal load. Conditions may also have many changes or special requirements, forming more complex variable working conditions

[0003] The complex conditions of changing working conditions will cause the axial thrust of the unit to change accordingly. Under extreme conditions, there will be a problem that the axial thrust of two or more working conditions cannot be coordinated, resulting in the thrust bearing on the steam turbine stator. The resultant force exceeds the allowable range, resulting in damage to the thrust bearing, and the unit cannot operate safely

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