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

A technology of axial thrust and adjustment system, which is applied in the direction of mechanical equipment, engine components, machines/engines, etc., can solve problems such as complex variable working conditions, complex axial thrust changes of units, and excess force on thrust bearings, etc., to achieve Avoid the effect of damage

Active Publication Date: 2021-02-26
DONGFANG TURBINE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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Embodiment 1

[0024] Such as figure 1 As shown, the axial thrust adjustment system of the steam turbine under variable working conditions in this embodiment includes a steam turbine 1, a balance disc 2 is installed on the rotor of the steam turbine 1, and a thrust bearing 3 is connected to the stator of the steam turbine 1; The first steam extraction port 4 and the second steam extraction port 5 are provided, the first steam extraction port 4 and the second steam extraction port 5 are respectively connected to the balance plate 2 through pipelines, the first steam extraction port 4 is connected to the steam inlet of the steam turbine 1 The distance between the ports is smaller than the distance between the second steam extraction port 5 and the steam inlet port of the steam turbine 1, and the first regulating valve 6 is connected to the pipeline between the first steam extraction port 4 and the balance plate 2, and the second steam extraction port 5 and the The pipeline between the balance ...

Embodiment 2

[0032] A method for using an axial thrust adjustment system under variable operating conditions of a steam turbine, comprising the following steps:

[0033] S1: Adjust the steam turbine 1 from the design working condition to the transitional working condition; wherein, the transitional working condition is 40% to 60% of the rated pure condensing or pure back working condition;

[0034] S2: Close the first regulating valve 6 and open the second regulating valve 7; wherein, the first regulating valve 6 is located on the pipeline between the first steam extraction port 4 and the balance plate 2, and the second regulating valve 7 is located on the second steam extraction port On the pipeline between the port 5 and the balance plate 2, the first steam extraction port 4 and the second steam extraction port 5 are respectively arranged on the steam turbine 1, and the distance between the first steam extraction port 4 and the steam inlet port of the steam turbine 1 is smaller than that ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D17/00F01D17/10F01D25/16
CPCF01D17/00F01D17/10F01D25/16
Inventor 洪安尧尹刚尹华劼张鹏飞段艳雄张伟荣张立志姚润贤果机小叶李海军高岱任洋文谋
Owner DONGFANG TURBINE CO LTD
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