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Low-pressure cylinder cooling steam device and running method

A technology for cooling steam and operating methods, applied in the direction of engine components, machines/engines, mechanical equipment, etc., to achieve the effect of ensuring safety, low temperature, and expanding the scope of application

Pending Publication Date: 2017-12-01
HUADIAN ELECTRIC POWER SCI INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no better technology at present to realize the recooling of the cooling steam

Method used

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  • Low-pressure cylinder cooling steam device and running method
  • Low-pressure cylinder cooling steam device and running method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: as figure 1 As shown, a low-pressure cylinder cooling steam device includes a medium-low pressure cylinder connecting pipe 31, a steam turbine low-pressure cylinder 11, a decompression device 12, a temperature reduction device 14, a heating extraction pipe 32, a gate valve 29, a No. 1 valve 21 and a No. 2 valve. Valve 22, connecting pipe 31 of medium and low pressure cylinder is connected with low pressure cylinder 11 of steam turbine, and No. Before the valve 22, the No. 1 valve 21 is installed on the heating extraction pipe 32; The tail end is connected to the low pressure cylinder 11 of the steam turbine, and the connection point between the initial end of the communication pipe bypass 33 and the communication pipe of the medium and low pressure cylinder is located before the No. 2 valve 22. Temperature device 14 and gate valve 29; Gate valve 29, No. 1 valve 21 and No. 2 valve 22 are regulating valves, and No. 2 valve 22, communication pipe bypass 33, ...

Embodiment 2

[0037] This embodiment is basically the same as Embodiment 1, the difference is that in Embodiment 2, the connecting pipe bypass 33 is connected to the decompression device 12, the pressure measuring instrument 13, the desuperheating device 14, the temperature measuring instrument 15, the steam Dehumidifier 16 and gate valve 29.

Embodiment 3

[0039] This embodiment is basically the same as Embodiment 2, the difference is that in Embodiment 3, No. 1 bypass 34, No. 3 valve 23, decompression device 12, pressure measuring instrument 13, No. 4 valve 24, desuperheating device 14, temperature measuring instrument 15, steam dehumidification device 16 and gate valve 29, No. 1 bypass 34 is connected in parallel with No. 3 valve 23, pressure reducing device 12, and No. 4 valve 24. One connection point between the road 34 and the communication pipe bypass 33 is located at the beginning of the communication pipe bypass 33 , the other is located between the No. 4 valve 24 and the temperature reduction device 14 , and the No. 1 bypass 34 is connected to the No. 5 valve 25 . No. three valve 23, No. four valve 24 and No. five valve 25 are regulating valves.

[0040] When in use, open and adjust the opening of No. 3 valve 23, open No. 4 valve 24 and gate valve 29, and close No. 5 valve 25. A stream of exhaust steam from the medium-p...

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Abstract

The invention discloses a low-pressure cylinder cooling steam device and a running method. The device comprises a middle-low-pressure cylinder communication pipe, a turbine low-pressure cylinder, a pressure reducing device and a temperature reducing device; the middle-low-pressure cylinder communication pipe is provided with a communication pipe bypass serving as a cooling steam pipeline; and the cooling steam pipeline is provided with the pressure reducing device and the temperature reducing device, and an outlet of the pressure reducing device and an outlet of the temperature reducing device are provided with a pressure measuring instrument and a temperature measuring instrument correspondingly. According to cooling parameters needed for the turbine low-pressure cylinder, the pressure, temperature, humidity and flow of cooling steam can be well adjusted, and it is guaranteed that the turbine low-pressure cylinder can be well cooled; and the low-pressure cylinder cooling problem of a turbine extraction condensing and extraction backpressure system is solved, and the application range of the turbine extraction condensing and extraction backpressure system is enlarged.

Description

technical field [0001] The invention belongs to the field of cogeneration of heat and power, in particular to a low-pressure cylinder cooling steam device and an operating method. Background technique [0002] At present, my country's policies are gradually emphasizing the promotion of new energy sources and reducing the proportion of thermal power units. For thermal power plants, the exhaust steam of the steam turbine is usually discharged directly through air cooling or water cooling, which causes a huge loss at the cold end. For example, the energy utilization rate of a 300MW subcritical pure condensing unit is about 38%, of which the loss at the cold end accounts for about 45%. After using steam extraction for heating, the energy utilization rate of the unit increases to 60%, but there is still 20% of condensing low-temperature waste heat This part of the heat is difficult to use directly due to its low grade. At the same time, as the power grid accommodates new energy...

Claims

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Application Information

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IPC IPC(8): F01D25/12
CPCF01D25/12
Inventor 孙士恩高新勇常浩张邵清俞聪刘帅
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD