Steam supply structure of steam turbine shaft seal system and adjusting method
A shaft seal system and adjustment method technology, applied in mechanical equipment, engine components, machines/engines, etc., can solve problems such as affecting the stability and reliability of steam turbine operation, non-compliance with shaft seals, etc., and achieve reliable and targeted supply, The adjustment accuracy is good and the effect of reducing the adjustment frequency
Active Publication Date: 2022-04-22
DONGFANG TURBINE CO LTD
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Problems solved by technology
Under such working conditions, the sealing steam at the rear shaft seal of the high-pressure cylinder still uses the same temperature as the front shaft seal, which obviously does not meet the technical requirement that the temperature of the sealing steam at the shaft seal should match the temperature of the current temperature field of the rotor. If the low-pressure shaft seal steam supply pipeline directly uses the cooled steam for sealing, it will not meet the technical requirements, which will affect the stability and reliability of the steam turbine operation
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[0038] The present invention relates to steam turbine shaft seal technology, specifically a steam supply structure and a steam supply adjustment method of a steam turbine shaft seal system, the following is combined with the accompanying drawings of the description - that is figure 1 and figure 2 The content of the technical solution of the present invention is explained clearly and in detail.
[0039] What needs to be specially explained here is that the drawings of the present invention are schematic, and unnecessary details have been simplified in order to clarify the technical purpose of the present invention, so as to avoid obscuring the technical solutions that the present invention contributes to the prior art.
[0040] see figure 1 As shown, the steam supply structure of the shaft seal system for the shaft seals of the high-pressure cylinder 12 and low-pressure cylinder 13 of the steam turbine includes the main steam supply pipeline 1, the water supply pipeline 2, th...
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The invention discloses a steam supply structure of a steam turbine shaft seal system and an adjusting method. The shaft seal system steam supply structure comprises a steam supply mother pipeline and a low-pressure shaft seal steam supply pipeline, and the low-pressure shaft seal steam supply pipeline is used for conveying sealing steam to a shaft seal structure of a low-pressure cylinder. A first high-pressure rear shaft seal steam supply pipeline is led out of the low-pressure shaft seal steam supply pipeline and used for conveying sealing steam to a rear shaft seal structure of a high-pressure cylinder, and a second high-pressure rear shaft seal steam supply pipeline is led out of the steam supply mother pipeline and used for conveying sealing steam to a rear shaft seal structure of the high-pressure cylinder. The second high-pressure rear shaft seal steam supply pipeline is connected into the first high-pressure rear shaft seal steam supply pipeline through a steam mixing device, and a second adjusting valve controlled by the DCS is arranged on the second high-pressure rear shaft seal steam supply pipeline. According to the invention, the sealing steam temperature of different shaft seals of the high-pressure cylinder and the low-pressure cylinder of the steam turbine can be reliably supplied in a targeted manner, so that the stable and reliable operation of the steam turbine is ensured.
Description
technical field [0001] The invention relates to a steam turbine shaft seal technology, in particular to a steam supply structure and a steam supply adjustment method of a steam turbine shaft seal system. Background technique [0002] In the steam turbine structure, the function of the shaft seal system is to provide suitable sealing steam for the steam turbine under various working conditions, and at the same time, recover the steam leaked from the steam seal at the end of the steam turbine, the main steam valve and the stem seal of the control valve, and the air mixture to prevent steam from leaking into the plant and prevent air from leaking into the cylinder to destroy the vacuum state of the unit. [0003] In the steam turbine structure, the rotor operates in a specific temperature field, and the sealing steam temperature required by each shaft seal structure on the rotor must match the temperature of the current temperature field of the rotor. Otherwise, the overcoolin...
Claims
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IPC IPC(8): F01D11/04
CPCF01D11/04
Inventor 卢平李林徐仕海张增明熊艳贾菲李永宏高李
Owner DONGFANG TURBINE CO LTD