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CN-116465251-B - Cleaning device for axial exhaust condenser of gas turbine unit and using method

CN116465251BCN 116465251 BCN116465251 BCN 116465251BCN-116465251-B

Abstract

The invention relates to the field of condenser chemical cleaning, and provides a cleaning device of an axial steam exhaust condenser of a gas turbine unit and a use method thereof, wherein the system comprises a circulating pump, a liquid inlet system, a liquid return system, a U-shaped pipe and a dosing device; the circulating pump is communicated with the liquid inlet system and the liquid return system, the liquid inlet system is communicated with the water inlet chamber of the low-level condenser, the liquid return system is communicated with the water return chamber of the high-level condenser, the two condenser water chambers are communicated through a U-shaped pipe, the medicine adding device is arranged at the outlet of the circulating pump, and the medicine adding device is arranged on a bypass pipeline of the liquid inlet system. The chemical cleaning safety, the quality and the reliable isolation of the circulating water butterfly valve of the axial steam exhaust condenser are ensured. The system improves the isolation mode of the circulating water pipeline, improves the working efficiency and has good economic benefit.

Inventors

  • FANG LEI
  • WEN HUIFENG
  • ZHANG ZHAO
  • LONG GUOJUN
  • WEI CHENGJUN
  • LIU YONGBING
  • LIAN WEI

Assignees

  • 西安热工研究院有限公司

Dates

Publication Date
20260505
Application Date
20230428

Claims (9)

  1. 1. The cleaning device of the axial steam exhaust condenser of the gas turbine unit is characterized by comprising a circulating pump (1), a liquid inlet system (2), a liquid return system (3), a U-shaped pipe (4) and a dosing device (5); The circulating pump (1) is communicated with the liquid inlet system (2) and the liquid return system (3), the liquid inlet system (2) is communicated with the low-position condenser water inlet chamber, the liquid return system (3) is communicated with the high-position condenser water return chamber, and the two condenser water chambers are communicated through the U-shaped pipe (4), the dosing device (5) is arranged at the outlet of the circulating pump (1), and the dosing device (5) is arranged on a bypass pipeline of the liquid inlet system (2); Temporary flanges matched with the manhole doors of the water chambers of the condensers are welded at two ends of the U-shaped pipe (4), and the water outlet chambers and the manhole doors of the water inlet chambers of the condensers are connected by two overlapped arrangement; The condenser water chamber butterfly valve is characterized by further comprising a butterfly valve isolation device (7) and a sealing device (8), wherein the butterfly valve isolation device (7) is formed by plugging sealing rings into circumferential holes on two sides of a condenser water chamber butterfly valve, and gluing and solidifying the sealing rings to form a first isolation layer, and the sealing device (8) is arranged on the condenser water chamber butterfly valve and forms a second isolation layer close to the condenser side; The sealing device (8) is a sealing air charging device matched with the pipe diameter of the circulating water pipe, the inner wall of the circulating water pipe is polished after the first isolation layer is finished, compressed air is introduced into the air charging device to enable the pressure of the air charging device to be 0.1-0.5 MPa after the air charging device is inflated, and the air charging device is placed on the butterfly valve and close to the condenser side to form a second isolation layer; the circulating pump (1), the liquid inlet system (2), the liquid return system (3), the U-shaped pipe (4), the dosing device (5), the homogenizing guide plate (6) and the axial steam exhaust condenser are connected through flanges to form a cleaning loop; The butterfly valve isolation device (7) and the sealing device (8) are arranged to form a butterfly valve safety isolation layer; the condenser exhaust eduction tube (9) is connected to the unit drainage tank, wherein the low-position condenser exhaust valve is opened intermittently, and the high-position condenser exhaust valve is kept normally open.
  2. 2. The cleaning device for the axial exhaust steam condensers of the gas turbine units according to claim 1, further comprising a homogenizing guide plate (6), wherein the homogenizing guide plate (6) is arranged at the inlet of the water inlet chamber of each condenser.
  3. 3. The cleaning device for the axial exhaust steam condenser of the gas turbine unit according to claim 1, wherein the exhaust outlet pipe (9) of the condenser is a steel wire pipe arranged on an exhaust pipe of a water chamber of the condenser or a liquid level meter pipe.
  4. 4. The device for cleaning the axial steam exhaust condenser of the gas turbine unit according to claim 1, wherein the liquid inlet system (2) is provided with a dosing butterfly valve, a dosing device and a liquid level meter, one side of the liquid inlet system (2) is connected with a flange of a circulating pump, and the other side of the liquid inlet system is connected with a flange of a water chamber of the lowest condenser.
  5. 5. The device for cleaning the axial steam exhaust condenser of the gas turbine unit according to claim 1, wherein the water supplementing door, the discharging door, the sampling door and the water returning door are arranged on the liquid returning system (3), one side of the liquid returning system (3) is connected with the flange of the circulating pump, and the other side of the liquid returning system is connected with the flange of the water chamber of the highest condenser.
  6. 6. The device for cleaning the axial steam exhaust condenser of the gas turbine unit according to claim 1, wherein the inlet and the outlet of the chemical adding device (5) are provided with stop valves.
  7. 7. Use of a device for cleaning an axial exhaust condenser of a gas turbine unit according to any one of claims 1 to 6, characterized in that it comprises the following steps: The water supplementing gate is opened to fill water into the water side of the condenser, the circulating pump (1) is started after the water is filled, and the medicine is injected into the cleaning system by using the medicine adding device (5) by adjusting the opening of the medicine adding device (5) until the cleaning is finished.
  8. 8. The method of use according to claim 7, wherein: by determining the exhaust amount of the exhaust pipe auxiliary judging whether the cleaning is close to the end point; whether the condenser water side is full of water or not is determined through a liquid level meter of the liquid inlet system, and whether the cleaning is close to the end point or not is judged through the concentration of the cleaning liquid tested by the sampling door.
  9. 9. The method of claim 7, wherein the step of preparing the condenser before opening the water replenishment door to fill the water side of the condenser is further performed: The circulating pump (1), the liquid inlet system (2), the liquid return system (3), the U-shaped pipe (4), the dosing device (5), the homogenizing guide plate (6) and the axial steam exhaust condenser are connected through flanges to form a cleaning loop; The butterfly valve isolation device (7) and the sealing device (8) are installed to form a butterfly valve safety isolation layer; The condenser exhaust outlet pipe (9) is connected to a unit drainage tank, wherein the low-position condenser exhaust valve is opened intermittently, and the high-position condenser exhaust valve is kept normally open.

Description

Cleaning device for axial exhaust condenser of gas turbine unit and using method Technical Field The invention belongs to the field of chemical cleaning of condensers, and particularly relates to a cleaning device of an axial exhaust condenser and a use method thereof. Background In recent years, a large number of gas-steam combined cycle units are introduced in southeast coastal areas of China due to environmental protection and electricity shortage pressure, and the axial steam exhaust units are mostly, and the axial steam exhaust units have the characteristics of small steam exhaust loss, low factory layout, small factory early investment and the like, but all the problems of reduced vacuum degree, increased end difference and reduced generated energy after one to two years of operation are encountered. The most common reason for the reduction of the vacuum degree and the rise of the end difference of the steam turbine condenser is that the scale in the condenser pipe is mostly removed by adopting a chemical cleaning mode, and the axial steam exhaust condenser is not exceptional, but the special horizontal arrangement tube bundle and the lamination arrangement mode determine that the traditional cleaning mode cannot be applied. Therefore, the axial steam exhaust condenser cleaning device and the use method are innovated, and the isolation mode of the circulating water pipeline is scientifically improved by combining years of practical experience, so that the axial steam exhaust condenser cleaning device has the advantages of simplicity, practicability, short construction period, safety, economy and the like. Disclosure of Invention The invention aims to solve the problems of reduced vacuum degree, increased end difference and the like of an axial exhaust condenser of a gas turbine unit caused by scaling in a pipe, and provides a cleaning device of the axial exhaust condenser of the gas turbine unit and a use method thereof. In order to achieve the above purpose, the invention adopts the following technical scheme: The cleaning device for the axial steam exhaust condenser of the gas turbine unit comprises a circulating pump, a liquid inlet system, a liquid return system, a U-shaped pipe and a dosing device; The circulating pump is communicated with the liquid inlet system and the liquid return system, the liquid inlet system is communicated with the water inlet chamber of the low-level condenser, the liquid return system is communicated with the water return chamber of the high-level condenser, the two condenser water chambers are communicated through a U-shaped pipe, the medicine adding device is arranged at the outlet of the circulating pump, and the medicine adding device is arranged on a bypass pipeline of the liquid inlet system. The invention further improves the condenser, and further comprises a homogenizing guide plate which is arranged at the inlet of the water inlet chamber of each condenser. The invention further improves the condenser, and also comprises a butterfly valve isolation device and a sealing device, wherein the butterfly valve isolation device is formed by plugging sealing rings into circumferential holes on two sides of a butterfly valve of a condenser water chamber, and gluing and solidifying the sealing rings to form a first isolation layer; The sealing device is a sealing air charging device matched with the pipe diameter of the circulating water pipe, the inner wall of the circulating water pipe is polished after the first isolation layer is finished, compressed air is introduced into the air charging device to enable the pressure of the air charging device to be 0.1-0.5 MPa after the air charging device is expanded, and the air charging device is placed on the butterfly valve and forms a second isolation layer close to the condenser side. The invention further improves the condenser exhaust outlet pipe, which is a steel wire pipe arranged on the exhaust pipe of the condenser water chamber or the liquid level meter pipe, and the condenser exhaust outlet pipe is connected to the unit drainage groove. As a further improvement of the invention, a dosing butterfly valve, a dosing device and a liquid level meter are arranged on the liquid inlet system, one side of the liquid inlet system is connected with a flange of the circulating pump, and the other side of the liquid inlet system is connected with a flange of a water chamber of the lowest condenser. As a further improvement of the invention, a water supplementing door, a discharging door, a sampling door and a water returning door are arranged on the liquid returning system, one side of the liquid returning system is connected with a flange of the circulating pump, and the other side of the liquid returning system is connected with a flange of a water chamber of the highest condenser. As a further improvement of the invention, the inlet and outlet of the dosing device are provided with stop valves. The application method of the