A cleaning device for a gas turbine unit axial exhaust steam condenser and a method of use

Abstract

This invention relates to the field of condenser chemical cleaning, and provides a cleaning device and method for an axial exhaust condenser in a gas turbine unit. The system includes a circulating pump, a liquid inlet system, a liquid return system, a U-shaped pipe, and a chemical dosing device. The circulating pump is connected to the liquid inlet system and the liquid return system. The liquid inlet system is connected to the inlet water chamber of the low-level condenser, and the liquid return system is connected to the return water chamber of the high-level condenser. The water chambers of the two condensers are connected by the U-shaped pipe. The chemical dosing device is installed at the outlet of the circulating pump and is located on the bypass pipeline of the liquid inlet system. This ensures the safety and quality of chemical cleaning of the axial exhaust condenser and the reliable isolation of the circulating water butterfly valve. The axial exhaust condenser cleaning process ensures smooth venting and does not cause overpressure in the water chamber. This system improves the isolation method of the circulating water pipeline, increases work efficiency, and has good economic benefits.

Description

Technical Field

[0001] This invention belongs to the field of condenser chemical cleaning, specifically relating to a cleaning device and method for an axial exhaust condenser. Background Technology

[0002] In recent years, due to environmental protection and power shortage pressures, a large number of gas-steam combined cycle units have been introduced in the southeastern coastal areas of my country. Among them, axial exhaust steam turbine units account for the majority. Although axial exhaust steam turbine units have the characteristics of low exhaust loss, low plant layout, and low initial investment in the plant, they will encounter problems such as decreased vacuum, increased terminal temperature difference, and decreased power generation after one to two years of operation.

[0003] The most common cause of decreased vacuum and increased terminal temperature difference in steam turbine condensers is scaling inside the condenser tubes. Scaling removal is mostly done through chemical cleaning, and axial exhaust condensers are no exception. However, their unique horizontal tube bundle arrangement and stacked layout make traditional cleaning methods unsuitable. Therefore, this invention innovates the cleaning device and method for axial exhaust condensers and scientifically improves the circulating water pipeline isolation method based on years of practical experience. It boasts advantages such as simplicity, practicality, short construction period, safety, and economy. Summary of the Invention

[0004] To address the issues of decreased vacuum and increased terminal temperature difference caused by scaling inside the axial exhaust condenser of a gas turbine unit, this invention aims to provide a cleaning device and method for the axial exhaust condenser of a gas turbine unit. This system improves the isolation method of the circulating water pipeline, increases working efficiency, and has good economic benefits.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A cleaning device for an axial exhaust condenser of a gas turbine unit includes a circulating pump, a liquid inlet system, a liquid return system, a U-tube, and a chemical dosing device.

[0007] The circulating pump is connected to the liquid inlet system and the liquid return system. The liquid inlet system is connected to the water inlet chamber of the low-level condenser, and the liquid return system is connected to the water return chamber of the high-level condenser. The water chambers of the two condensers are connected by a U-shaped pipe. The dosing device is installed at the outlet of the circulating pump and is located on the bypass pipeline of the liquid inlet system.

[0008] As a further improvement of the present invention, a homogeneous guide plate is also included; the homogeneous guide plate is installed at the inlet of the water inlet chamber of each condenser.

[0009] As a further improvement of the present invention, it also includes a butterfly valve isolation device and a sealing device. The butterfly valve isolation device is formed by inserting a sealing ring into the circumferential holes on both sides of the butterfly valve in the condenser water chamber, applying adhesive to the sealing ring and curing it to form a first isolation layer; the sealing device is placed on the side of the butterfly valve in the condenser water chamber near the condenser to form a second isolation layer.

[0010] The sealing device is a sealing air-filling device that matches the diameter of the circulating water pipeline. After the first isolation layer is completed, the inner wall of the circulating water pipeline is ground. Compressed air is introduced into the air-filling device to expand it to a pressure of 0.1 to 0.5 MPa. It is then placed on the butterfly valve near the condenser side to form the second isolation layer.

[0011] As a further improvement of the present invention, it also includes a condenser exhaust outlet pipe, which is a steel wire pipe installed in the condenser water chamber exhaust pipe or level gauge pipe; the condenser exhaust outlet pipe is connected to the unit drainage tank.

[0012] As a further improvement of the present invention, the liquid inlet system is equipped with a dosing butterfly valve, a dosing device, and a level gauge. One side of the liquid inlet system is connected to the flange of the circulating pump, and the other side is connected to the flange of the lowest condenser water chamber.

[0013] As a further improvement of the present invention, the liquid return system is equipped with a water supply valve, a discharge valve, a sampling valve, and a return water valve. One side of the liquid return system is connected to the flange of the circulating pump, and the other side is connected to the flange of the highest condenser water chamber.

[0014] As a further improvement of the present invention, both the inlet and outlet of the dosing device are equipped with shut-off valves.

[0015] A method for using a cleaning device for an axial exhaust condenser of a gas turbine unit includes the following steps:

[0016] Open the water supply valve to inject water into the condenser water side. After the water is full, start the circulation pump. Adjust the opening of the dosing device and use the dosing device to inject chemicals into the cleaning system until the cleaning is completed.

[0017] As a further improvement of the present invention, the exhaust volume of the exhaust pipe is used to help determine whether the cleaning is close to the end point;

[0018] The level gauge of the liquid inlet system is used to determine whether the water side of the condenser is full, and the concentration of the cleaning solution is tested through the sampling gate to determine whether the cleaning is nearing its end.

[0019] As a further improvement to the present invention, a preparation step is included before opening the water supply valve to inject water into the water side of the condenser:

[0020] The cleaning circuit is formed by welding and flange connection of the circulating pump, liquid inlet system, liquid return system, U-tube, dosing device, homogenized guide plate and axial exhaust condenser.

[0021] The butterfly valve isolation device and sealing device are installed to form the butterfly valve safety isolation layer;

[0022] The condenser exhaust pipe is connected to the unit drainage tank, with the low-level condenser exhaust valve opening intermittently and the high-level condenser exhaust valve remaining normally open.

[0023] This invention has the following innovative features:

[0024] This invention discloses a cleaning device for an axial exhaust condenser in a gas turbine unit, comprising a homogeneous guide plate, a butterfly valve isolation device, and a sealing device, ensuring the safety and quality of chemical cleaning of the axial exhaust condenser and reliable isolation of the circulating water butterfly valve. The axial exhaust condenser cleaning process ensures smooth exhaust, preventing overpressure in the water chamber. Furthermore, the system is simple in design, easy to install, quick to dismantle, safe, reliable, and easy to implement. This invention ensures the economical, safe, and stable operation of the axial exhaust condenser, demonstrating significant economic and social benefits during the initial stage of domestic production of axial exhaust condensers. The system is simple, safe, and reliable, innovating traditional cleaning devices and methods based on the structure and layout of the axial exhaust condenser in gas turbine units. It also improves the circulating water pipeline isolation method, increasing work efficiency and achieving good economic benefits. Attached Figure Description

[0025] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. In the drawings:

[0026] Figure 1 This is a schematic diagram of a cleaning device for an axial exhaust condenser of a gas turbine unit according to the present invention.

[0027] In the diagram: 1—Circulating pump; 2—Inlet system; 3—Return system; 4—U-tube; 5—Dosing device; 6—Homogeneous guide plate; 7—Butterfly valve isolation device; 8—Sealing device; 9—Condenser exhaust pipe. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0029] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] As shown in the figure, the present invention provides a cleaning device for the axial exhaust condenser of a gas turbine unit, including a circulating pump 1, a liquid inlet system 2, a liquid return system 3, a U-shaped pipe 4, and a chemical dosing device 5;

[0032] The circulating pump 1 is connected to the liquid inlet system 2 and the liquid return system 3. The liquid inlet system 2 is connected to the water inlet chamber of the low-level condenser, and the liquid return system 3 is connected to the water return chamber of the high-level condenser. The water chambers of the two condensers are connected by a U-shaped pipe 4. The dosing device 5 is installed at the outlet of the circulating pump 1 and is located on the bypass pipeline of the liquid inlet system 2.

[0033] Specifically, the liquid inlet system 2 is connected to the water inlet chamber of the low-level condenser, the liquid return system 3 is connected to the water return chamber of the high-level condenser, the water chambers of the two condensers are connected by a U-shaped pipe 4, the dosing device 5 is installed at the outlet of the circulating pump, the homogeneous guide plate 6 is installed in the water inlet chamber of each condenser, the butterfly valve isolation device 7 is formed by inserting sealing rings into the circumferential gaps on both sides of the butterfly valve, and applying glue to the sealing rings for curing to form the first isolation layer; the sealing device 8 is placed on the butterfly valve near the condenser side to form the second isolation layer; the condenser exhaust pipe 9 is a steel wire pipe installed in the exhaust pipe of the condenser water chamber or the level gauge pipe.

[0034] The system is simple, safe, and reliable in design. It innovates traditional cleaning devices and usage methods based on the structure and layout of the axial exhaust condenser of the gas turbine unit, and scientifically improves the isolation method of the circulating water pipeline, thereby improving work efficiency and having good economic benefits.

[0035] In the above embodiments, both the inlet and outlet of the circulating pump 1 are equipped with butterfly valves;

[0036] The liquid inlet system 2 is equipped with a dosing butterfly valve, a dosing device, and a level gauge. One side is connected to the flange of the circulating pump, and the other side is connected to the flange of the lowest condenser water chamber. The liquid return system 3 is equipped with a water supply valve, a discharge valve, a sampling valve, and a return valve. One side is connected to the flange of the circulating pump, and the other side is connected to the flange of the highest condenser water chamber.

[0037] The U-shaped pipe 4 has temporary flanges welded to both ends to match the manhole doors of the condenser water chamber, connecting the water outlet chamber and the water inlet chamber manhole doors of the two stacked condensers.

[0038] The dosing device 5 has shut-off valves at both its inlet and outlet; the homogeneous guide plate 6 is a circular steel plate welded to the temporary flange at a certain angle to the axial direction, installed in the inlet water chamber of each condenser to avoid uneven water flow and the problem of the tail tube bundle not being cleaned; the butterfly valve isolation device 7 requires grinding away the debris in the circumferential holes of the circulating water butterfly valves on both sides, inserting a sealing ring that can cover the circumferential holes, applying adhesive to the sealing ring, and then air-drying and curing it with the substrate to form the first isolation layer.

[0039] The sealing device 8 is a sealing and air-filling device that matches the diameter of the circulating water pipe. After the first isolation layer is completed, the inner wall of the circulating water pipe is ground. Compressed air is introduced into the air-filling device to make it expand to a pressure of 0.1 to 0.5 MPa. It is placed on the butterfly valve near the condenser side to form the second isolation layer.

[0040] The condenser exhaust pipe 9 is a steel wire pipe installed in the condenser water chamber exhaust pipe or level gauge pipe, which is led to the unit drainage tank to discharge the gas generated by the cleaning reaction.

[0041] The present invention also provides a method for using a cleaning device for an axial exhaust condenser of a gas turbine unit, the method comprising the following steps:

[0042] Step 1: Connect the circulating pump 1, liquid inlet system 2, liquid return system 3, U-tube 4, dosing device 5, homogenized guide plate 6, and axial exhaust condenser to form a cleaning circuit by welding and flange connection.

[0043] Step 2: Personnel enter the circulating water pipes before and after the butterfly valve to install the butterfly valve isolation device 7 and sealing device 8 to form the butterfly valve safety isolation layer;

[0044] Step 3: Connect the condenser exhaust pipe 9 to the unit drainage tank. The exhaust valve of the low-level condenser is opened intermittently, while the exhaust valve of the high-level condenser is kept open to avoid excessive exhaust volume during the reaction process, which could cause overpressure in the condenser water chamber.

[0045] Step 4: Open the water supply valve to inject water into the condenser water side. After the water is full, start the circulation pump. By adjusting the opening of the chemical dosing butterfly valve, use the chemical dosing device to inject chemicals into the cleaning system until the cleaning is completed.

[0046] In step one, it is necessary to clean the debris inside the condenser tubes and water chamber in advance, and remove the sacrificial anode block inside the water chamber.

[0047] In step three, the exhaust volume of the exhaust pipe is used to help determine whether the cleaning is nearing its end.

[0048] In step four, the level gauge of the liquid inlet system is used to determine whether the water side of the condenser is full, and the concentration of the cleaning solution is tested through the sampling gate to determine whether the cleaning is nearing its end.

[0049] The following describes the specific solution of the present invention using preferred embodiments as examples. However, this is not intended to limit the scope of the invention.

[0050] like Figure 1 As shown, a cleaning device for an axial exhaust condenser of a gas turbine unit includes a circulating pump 1, a liquid inlet system 2, a liquid return system 3, a U-shaped pipe 4, a chemical dosing device 5, a homogenized guide plate 6, a butterfly valve isolation device 7, a sealing device 8, and a condenser exhaust outlet pipe 9. The circulating pump 1 is connected to the liquid inlet system 2 and the liquid return system 3. The liquid inlet system 2 is connected to the water inlet chamber of the low-level condenser, and the liquid return system 3 is connected to the water return chamber of the high-level condenser. The water chambers of the two condensers are connected through the U-shaped pipe 4. The chemical dosing device 5 is installed at the outlet of the circulating pump. The homogenized guide plate 6 is installed in the water inlet chamber of each condenser. The butterfly valve isolation device 7 consists of sealing rings inserted into the circumferential holes on both sides of the butterfly valve, and the sealing rings are coated with adhesive and cured to form the first isolation layer. The sealing device 8 is placed on the butterfly valve near the condenser side to form the second isolation layer. The condenser exhaust outlet pipe 9 is a steel wire pipe installed in the exhaust pipe of the condenser water chamber or the level gauge pipe.

[0051] The method of using the cleaning device for the axial exhaust condenser of the gas turbine unit as described above includes:

[0052] The cleaning circuit is formed by welding and flange connecting the circulating pump, liquid inlet system, liquid return system, U-tube, chemical dosing device, homogenized guide plate, and axial exhaust condenser. Personnel enter the circulating water pipes before and after the four butterfly valves through manholes and install the four butterfly valve isolation devices and sealing devices to form a butterfly valve safety isolation layer. The condenser exhaust pipe is connected to the unit drainage tank, with the low-level condenser exhaust valve opened intermittently and the high-level condenser exhaust valve kept open to avoid excessive exhaust volume during the reaction process causing overpressure in the condenser water chamber. The water supply valve is opened to inject water into the condenser water side. After the water is full, the circulating pump is started, and the chemical dosing device is used to inject chemicals into the cleaning system by adjusting the opening of the chemical dosing butterfly valve until the circulation cleaning is completed.

[0053] Many embodiments and applications beyond the examples provided will be apparent to those skilled in the art upon reading the foregoing description. Therefore, the scope of this teaching should not be determined by reference to the foregoing description, but rather by reference to the foregoing claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the applicant has not considered that subject matter as part of the disclosed inventive subject matter.

[0054] The above content provides a further detailed description of the present invention. It should not be construed that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all such deductions or substitutions should be considered to fall within the protection scope of the present invention.

Claims

1. A cleaning device for an axial exhaust condenser of a gas turbine unit, characterized in that: It includes a circulating pump (1), a liquid inlet system (2), a liquid return system (3), a U-tube (4), and a dosing device (5); The circulating pump (1) is connected to the liquid inlet system (2) and the liquid return system (3). The liquid inlet system (2) is connected to the water inlet chamber of the low-level condenser, and the liquid return system (3) is connected to the water return chamber of the high-level condenser. The water chambers of the two condensers are connected through a U-shaped pipe (4). The dosing device (5) is installed at the outlet of the circulating pump (1) and is located on the bypass pipeline of the liquid inlet system (2). The U-shaped pipe (4) has temporary flanges welded at both ends to match the manhole doors of the condenser water chamber, connecting the water outlet chambers of the two stacked condensers to the water inlet chamber manhole doors. It also includes a butterfly valve isolation device (7) and a sealing device (8). The butterfly valve isolation device (7) is formed by inserting a sealing ring into the circumferential holes on both sides of the butterfly valve in the condenser water chamber, and applying glue to the sealing ring for curing to form the first isolation layer. The sealing device (8) is placed on the side of the butterfly valve in the condenser water chamber near the condenser to form the second isolation layer. The sealing device (8) is a sealing air-filling device that matches the diameter of the circulating water pipe. After the first isolation layer is completed, the inner wall of the circulating water pipe is polished. Compressed air is introduced into the air-filling device to make it expand to a pressure of 0.1~0.5MPa. It is placed on the butterfly valve near the condenser side to form the second isolation layer. The circulating pump (1), liquid inlet system (2), liquid return system (3), U-tube (4), dosing device (5), homogeneous guide plate (6) and axial exhaust condenser are connected by flanges to form a cleaning circuit; The butterfly valve isolation device (7) and sealing device (8) are installed to form the butterfly valve safety isolation layer; The condenser exhaust pipe (9) is connected to the unit drainage tank, wherein the low-level condenser exhaust valve is opened intermittently, and the high-level condenser exhaust valve is kept open.

2. The cleaning device for an axial exhaust condenser of a gas turbine unit according to claim 1, characterized in that: It also includes a homogeneous guide plate (6); the homogeneous guide plate (6) is installed at the inlet of the water inlet chamber of each condenser.

3. The cleaning device for an axial exhaust condenser of a gas turbine unit according to claim 1, characterized in that: The condenser exhaust outlet pipe (9) is a steel wire pipe installed in the condenser water chamber exhaust pipe or level gauge pipe.

4. A cleaning device for an axial exhaust condenser of a gas turbine unit according to claim 1, characterized in that: The liquid inlet system (2) is equipped with a dosing butterfly valve, a dosing device, and a level gauge. One side of the liquid inlet system (2) is connected to the flange of the circulating pump, and the other side is connected to the flange of the lowest condenser water chamber.

5. A cleaning device for an axial exhaust condenser of a gas turbine unit according to claim 1, characterized in that: The return liquid system (3) is equipped with a water supply valve, a discharge valve, a sampling valve, and a return water valve. One side of the return liquid system (3) is connected to the flange of the circulating pump, and the other side is connected to the flange of the highest condenser water chamber.

6. A cleaning device for an axial exhaust condenser of a gas turbine unit according to claim 1, characterized in that: The dosing device (5) has shut-off valves at both its inlet and outlet.

7. A method of using the cleaning device for the axial exhaust condenser of a gas turbine unit as described in any one of claims 1 to 6, characterized in that, Includes the following steps: Open the water supply valve to inject water into the condenser water side. After the water is full, start the circulation pump (1). By adjusting the opening of the dosing device (5), use the dosing device (5) to inject the cleaning agent into the cleaning system until the cleaning is completed.

8. The method of use according to claim 7, characterized in that: The amount of exhaust gas from the exhaust pipe can be used to help determine whether the cleaning process is nearing its end. The level gauge of the liquid inlet system is used to determine whether the water side of the condenser is full, and the concentration of the cleaning solution is tested through the sampling gate to determine whether the cleaning is nearing its end.

9. The method of use according to claim 7, characterized in that: Before opening the water inlet valve to inject water into the condenser water side, the following preparation steps are also included: The circulating pump (1), liquid inlet system (2), liquid return system (3), U-tube (4), dosing device (5), homogeneous guide plate (6) and axial exhaust condenser are connected by flanges to form a cleaning circuit; The butterfly valve isolation device (7) and sealing device (8) are installed to form the butterfly valve safety isolation layer; Connect the condenser exhaust pipe (9) to the unit drainage tank, wherein the low-level condenser exhaust valve is opened intermittently and the high-level condenser exhaust valve is kept open.

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