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Water spray cooling method and system for low-pressure exhaust cylinder of air-cooled steam turbine

A water spray cooling and exhaust cylinder technology, applied in the field of steam turbines, can solve the problems of low pressure cylinder water spray cooling failure and other problems

Active Publication Date: 2017-02-22
DONGFANG TURBINE CO LTD
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  • Claims
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Problems solved by technology

[0007] In view of the above problems, the present invention provides a water spray cooling method and system for the low-pressure exhaust cylinder of an air-cooled steam turbine to solve the problem of water spray cooling failure of the low-pressure cylinder under high back pressure operation. The technical solution is:

Method used

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  • Water spray cooling method and system for low-pressure exhaust cylinder of air-cooled steam turbine

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Embodiment Construction

[0015] see figure 1 : This air-cooled steam turbine low-pressure exhaust cylinder water spray cooling system includes a condensate pump 1, a regulating valve 2, and a nozzle 3, which are sequentially connected through pipelines to form a water spray pipeline, and the condensate pump 1 extracts the condensate in the low-pressure exhaust cylinder 4. Regulating valve 2 regulates the flow of condensed water, and sprays the exhaust steam in low-pressure exhaust cylinder 4 through nozzle 3. Between condensed water pump 1 and regulating valve 2, there are two parallel water supply branches, one of which is a straight-through branch. The condensed water can be sent directly to the regulating valve 2, and the other one is equipped with a water / water heat exchanger 5, and the condensed water is cooled by the discharge water at the outlet of the lubricating oil cooler, and then the cooled condensed water is sent to the regulating valve 2, The two water supply branches are switched by the...

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Abstract

The invention discloses a water spray cooling method for the low-pressure exhaust cylinder of an air-cooled steam turbine. When the unit is operating in a conventional back pressure state, when the condensate temperature is lower than the exhaust temperature, the condensate is used to spray the exhaust steam in the low-pressure exhaust cylinder; when the unit is running When the condensed water temperature is higher than the exhaust steam temperature under high back pressure, first use the discharge water from the outlet of the lubricating oil cooler to cool the condensed water, reduce the temperature of the condensed water, and then use the cooled condensed water to spray the low-pressure exhaust steam cylinder internal exhaust.

Description

technical field [0001] The invention relates to a steam turbine, in particular to a water spray cooling method and system for the low-pressure cylinder of the steam turbine. Background technique [0002] When the steam turbine is started, no-load and low-load, the steam flow rate is very small, which is not enough to take away the heat generated by the blast friction in the low-pressure cylinder, causing the temperature of the exhaust steam to rise, and the temperature of the exhaust cylinder also rises accordingly. Excessive exhaust cylinder temperature will cause large deformation of the cylinder, destroy the consistency of the center line of the static part of the steam turbine, and cause unit vibration or other accidents in severe cases. For this reason, a water spray cooling device is installed in the low-pressure cylinder. [0003] The operation regulations of the air-cooled unit are that when the exhaust steam temperature is higher than 65°C, the low-pressure cylinde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02F1/10
CPCF01D25/12F01D25/30F01D25/32
Inventor 史宣平方宇罗方刘金芳张志勇欧阳杰薛军魏小龙朱志坚郑建母攀
Owner DONGFANG TURBINE CO LTD
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