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CN-224228730-U - Feed pump steam turbine system suitable for deep peak shaving

CN224228730UCN 224228730 UCN224228730 UCN 224228730UCN-224228730-U

Abstract

The application discloses a water feeding pump turbine system suitable for deep peak shaving, belongs to the technical field of thermal power generation, and mainly aims to ensure that a water feeding pump turbine operates efficiently under the deep peak shaving working condition of a main turbine. The main technical scheme is that the water feeding pump turbine system suitable for deep peak shaving comprises a water feeding pump turbine, a first low-pressure steam pipe and a second low-pressure steam pipe, wherein the power adjusting range of the water feeding pump turbine at least covers the steam parameter change requirement of the load of a main turbine within the range of 30% -100% of rated load, the first low-pressure steam pipe and the second low-pressure steam pipe are arranged in parallel, the water feeding pump turbine is communicated with the first low-pressure steam pipe when the load of the main turbine is below 90% of rated load, and the water feeding pump turbine is simultaneously communicated with the first low-pressure steam pipe and the second low-pressure steam pipe when the load of the main turbine exceeds 90% of rated load.

Inventors

  • Tong Yutao
  • LI ENFENG
  • YU HONGBING
  • ZHAO LIHUA
  • ZHANG YU
  • WANG XUEBO
  • CHEN JIANWEI

Assignees

  • 北京国能龙威发电技术有限公司

Dates

Publication Date
20260512
Application Date
20250516

Claims (10)

  1. 1. A feedwater pump turbine system suitable for deep peaking, comprising: a feed pump turbine (1), a first low-pressure steam pipe (2) and a second low-pressure steam pipe (3); The power regulation range of the feed pump turbine (1) at least covers the steam parameter change requirement of the main turbine load within the range of 30% -100% of rated load; The first low-pressure steam pipe (2) and the second low-pressure steam pipe (3) are arranged in parallel, and are configured such that the feed-water pump turbine (1) is communicated with the first low-pressure steam pipe (2) when the main turbine load is below 90% of the rated load, and the feed-water pump turbine (1) is simultaneously communicated with the first low-pressure steam pipe (2) and the second low-pressure steam pipe (3) when the main turbine load exceeds 90% of the rated load.
  2. 2. The feedwater pump turbine system of claim 1, further comprising: A low pressure steam source; The low-pressure steam source is a four-steam-pumping pipe (4), and the four-steam-pumping pipe (4) is respectively communicated with the first low-pressure steam pipe (2) and the second low-pressure steam pipe (3).
  3. 3. The water feed pump turbine system suitable for deep peak shaving according to claim 2, wherein the four-suction steam pipe (4) is provided with an electric isolation valve (5).
  4. 4. The feed pump turbine system suitable for deep peaking as claimed in claim 1, wherein the first low pressure steam pipe (2) is provided with a first main steam valve (6) and a first regulating valve (7).
  5. 5. The feed pump turbine system suitable for deep peaking as claimed in claim 4, wherein the first regulating valve (7) is disposed at a downstream side of the first main steam valve (6) in a steam flow path direction.
  6. 6. The feed pump turbine system suitable for deep peaking as claimed in claim 1, wherein the second low pressure steam pipe (3) is provided with a second main steam valve (8) and a second regulating valve (9).
  7. 7. The feed pump turbine system suitable for deep peaking as claimed in claim 6, wherein the second regulating valve (9) is disposed at a downstream side of the second main steam valve (8) in a steam flow path direction.
  8. 8. The feed pump turbine system suitable for deep peak shaving according to claim 1, wherein a first regulating stage nozzle communicated with the outlet of the first low-pressure steam pipe (2) is arranged in the feed pump turbine (1), and the nozzle area of the first regulating stage nozzle is adapted to the range of 30% -90% of rated load of the main turbine.
  9. 9. The feed pump turbine system suitable for deep peaking according to claim 8, characterized in that a second regulating stage nozzle communicated with the outlet of the second low pressure steam pipe (3) is further arranged in the feed pump turbine (1), and the nozzle area of the second regulating stage nozzle is smaller than that of the first regulating stage nozzle.
  10. 10. The feedwater pump turbine system of claim 1, further comprising: a steam exhaust pipe (10); the steam exhaust pipe (10) is communicated with the water feeding pump steam turbine (1).

Description

Feed pump steam turbine system suitable for deep peak shaving Technical Field The application belongs to the technical field of thermal power generation, and particularly relates to a water supply pump turbine system suitable for deep peak shaving. Background In modern thermal power generation systems, a feed pump is core equipment for guaranteeing stable supply of boiler feed water, and the running performance of a feed pump turbine of a driving device directly influences the overall efficiency and reliability of a unit. Along with the continuous improvement of the power market on the flexibility and the economical requirements of the unit, the water feeding pump turbine needs to be operated efficiently in a wide load range so as to adapt to the peak shaving requirements of the power grid and the targets of energy conservation and emission reduction. The traditional water-feeding pump turbine system mostly adopts a 'high-low' steam inlet scheme, namely, the water-feeding pump turbine is driven by the combination of high-pressure steam and low-pressure steam. Under the scheme, the problem of fluctuation of the rotating speed of the water feeding pump turbine when the low-pressure steam source is switched to the high-pressure steam source exists. Disclosure of utility model In view of the above, the application provides a water feed pump turbine system suitable for deep peak shaving, which mainly aims to ensure that a water feed pump turbine operates efficiently under the deep peak shaving working condition of a main turbine and simultaneously avoid the problem of large fluctuation of the rotation speed of the water feed pump turbine caused by switching of a high-pressure steam source. In order to achieve the above purpose, the present application mainly provides the following technical solutions: the application provides a water supply pump turbine system suitable for deep peak shaving, which comprises: The system comprises a feed pump turbine, a first low-pressure steam pipe and a second low-pressure steam pipe; The power regulation range of the feed pump turbine at least covers the steam parameter change requirement of the main turbine load within the range of 30% -100% of rated load; The first low-pressure steam pipe and the second low-pressure steam pipe are arranged in parallel, and are configured such that the feed pump turbine is communicated with the first low-pressure steam pipe when the load of the main turbine is below 90% of the rated load, and is communicated with the first low-pressure steam pipe and the second low-pressure steam pipe simultaneously when the load of the main turbine exceeds 90% of the rated load. Optionally, the feed pump turbine system suitable for deep peak shaving further comprises: A low pressure steam source; The low-pressure steam source is a four-steam-extraction pipe, and the four-steam-extraction pipe is respectively communicated with the first low-pressure steam pipe and the second low-pressure steam pipe. Optionally, an electric isolation valve is arranged on the four-steam-pumping pipe. Optionally, the first low-pressure steam pipe is provided with a first main steam valve and a first regulating valve. Optionally, the first regulating valve is disposed on a downstream side of the first main steam valve in a steam flow path direction. Optionally, a second main steam valve and a second regulating valve are arranged on the second low-pressure steam pipe. Optionally, the second regulating valve is disposed on a downstream side of the second main steam valve in a steam flow path direction. Optionally, a first adjusting stage nozzle communicated with the outlet of the first low-pressure steam pipe is arranged in the water feeding pump steam turbine, and the nozzle area of the first adjusting stage nozzle is adapted to the load of the main steam turbine in the range of 30% -90% of rated load. Optionally, a second regulating stage nozzle communicated with the outlet of the second low-pressure steam pipe is further arranged in the water feeding pump steam turbine, and the nozzle area of the second regulating stage nozzle is smaller than that of the first regulating stage nozzle. Optionally, the feed pump turbine system suitable for deep peak shaving further comprises: A steam exhaust pipe; the steam exhaust pipe is communicated with the water feeding pump steam turbine. By means of the technical scheme, the application has at least the following beneficial effects: According to the water feeding pump turbine system suitable for deep peak shaving, provided by the embodiment of the application, through the parallel arrangement of the first low-pressure steam pipe and the second low-pressure steam pipe and flexible communication configuration according to the load of the main turbine, when the load of the main turbine is low (below 90% of rated load), the first low-pressure steam pipe is only used for supplying steam to the water feeding pump turbine, the energy of low-pressur