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Water spry cooling method and system of low-pressure exhaust hood of air-cooling steam turbine

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

Active Publication Date: 2015-04-22
DONGFANG TURBINE CO LTD
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  • Application Information

AI Technical Summary

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 spry cooling method and system of low-pressure exhaust hood of air-cooling 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 of a low-pressure exhaust hood of an air-cooling steam turbine. When an airscrew runs under a conventional back-pressure condition that the temperature of condensation water is lower than the temperature of exhaust steam, the exhaust steam in the low-pressure exhaust hood is sprayed with the condensation water; when the airscrew runs under a high back-pressure condition that the temperature of the condensation water is higher than the temperature of the exhaust steam, the condensation water is firstly cooled by exhaust water from an outlet of an lubricating oil cooler to lower the temperature of the condensation water, and then the exhaust steam in the low-pressure exhaust hood is sprayed with the condensation water of which the temperature is lowered.

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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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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