System and method for freezing prevention of cold end of turbine during removal of low-pressure cylinder from air cooling unit
A technology of air-cooling unit and anti-freezing system, which is applied in the direction of machines/engines, mechanical equipment, steam engine devices, etc., to achieve the effect of stable operation, high degree of automation, and safe operation
Active Publication Date: 2020-10-16
HUADIAN ELECTRIC POWER SCI INST CO LTD
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Problems solved by technology
The present invention can firstly solve the antifreeze problem of the cold end of the steam turbine in winter under extremely low exhaust steam flow rate, and is especially suitable for units that need to operate for a long time under extremely low exhaust steam flow conditions; the second system can accurately control the vacuum degree of the cold end of the steam turbine , to ensure the safe operation of the unit; thirdly, exhaust steam can be used to heat the raw water to be treated, so as to improve the water production efficiency of the equipment
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[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are explanations of the present invention and the present invention is not limited to the following examples.
[0021] Example.
[0022] see figure 1 , in this embodiment, an antifreeze system for the cold end of the steam turbine when the low-pressure cylinder is removed from the air-cooled unit, including an air-cooled steam turbine 1, a exhaust steam pipeline 2, an air-cooling tower isolation valve 3, an air-cooling tower 4, a condensate water pipeline 5, and a condenser isolation valve 6. Condenser 7, temperature monitoring device 8, raw water pipeline 9, raw water heating valve 10, desalinated water treatment device 11, desalted water pipeline 12, raw water bypass valve 13, low-pressure cylinder steam extraction pipeline 14 and steam extraction regulating valve 15. Among them, the air-cooled steam turbine 1 is a steam t...
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The invention discloses a system and method for freezing prevention of a cold end of a turbine during removal of a low-pressure cylinder from an air cooling unit and belongs to the technical field ofcombined heat and power generation cogeneration. At present, there is no system which can effectively realize freezing prevention of an air cooling tower under an ultra-low waste steam flow rate. Thesystem disclosed by the invention comprises an air cooling turbine, a waste steam pipeline, an air cooling tower isolation valve, an air cooling tower, a condensate pipeline, a condenser isolation valve and a condenser, wherein a waste steam outlet of the air cooling turbine is connected to an input of the air cooling tower isolation valve and an inlet of the condenser isolation valve by the wastesteam pipeline respectively; an outlet of the air cooling tower isolation valve is connected to a waste steam inlet of the air cooling tower; a condensate outlet of the air cooling tower is connectedto the condensate pipeline; an outlet of the condenser isolation valve is connected to a steam side inlet of the condenser; and a steam side outlet of the condenser is bypass connected to the condensate pipeline. The system and the method disclosed by the invention have the beneficial effects that reliability is high; economic benefits are good; and an anti-freezing problem of the cold end of theturbine under the ultralow waste steam working condition can be solved effectively.
Description
technical field [0001] The invention relates to an antifreeze system for the cold end of a steam turbine when a low-pressure cylinder is removed for an air-cooling unit, which is a system capable of realizing antifreeze for an air-cooling tower at an extremely low exhaust steam flow rate, and belongs to the technical field of cogeneration of heat and power. Background technique [0002] For air-cooled generator sets, the traditional heating extraction method only extracts part of the exhaust steam from the medium-pressure cylinder, and the steam turbine will still have a large flow of exhaust steam. The flow of exhaust steam is generally above the safe antifreeze flow of the air cooling tower in winter. Therefore, when the air-cooling unit uses steam extraction for heating, the air-cooling tower often does not need special modification. [0003] The new condensing and pumping retrofit technology is different from the traditional steam extraction and heating technology. By in...
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IPC IPC(8): F01K13/02F01K7/38
CPCF01K13/02F01K7/38F01K7/345
Inventor 郑立军陈飞飞马斯鸣阮宇雯谢正超王永学
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD