Generator stator cooling water hydrogen leakage detection device

Abstract

The utility model relates to the technical field of generator stator cooling water systems, in particular to a generator stator cooling water hydrogen leakage detection device, which is provided with an exhaust pipeline and a first branch pipe, and a hydrogen leakage sensor is arranged in the first branch pipe, so that gas flowing through the exhaust pipeline can be detected under the condition that the circulation of gas in an exhaust main pipe is not influenced; the circulation degree of mixed gas is improved, gas accumulation is reduced, the measurement error of the hydrogen leakage sensor is reduced, water vapor is removed through the condenser and the steam-water separator, water vapor corrosion is effectively avoided, the service life of the hydrogen leakage sensor is prolonged, the mixing mechanism is arranged, various kinds of gas in the main exhaust pipe can be mixed conveniently, and the safety of the hydrogen leakage sensor is improved. The hydrogen leakage amount in the exhaust pipeline can be measured, and the device has wide application prospects in the technical field of generator stator cooling water systems.

Description

Technical Field

[0001] The utility model relates to the technical field of generator cooling water systems, in particular to a generator cooling water hydrogen leakage detection device. Background Art

[0002] Generators using a "water-hydrogen-hydrogen" cooling method use water internal cooling for the stator windings, hydrogen internal cooling for the rotor windings, and hydrogen cooling for the stator core. Under normal circumstances, the hydrogen system and the water cooling system are completely isolated and independent. The hydrogen system comprises a closed-loop system consisting of the generator stator housing, end caps, hydrogen cooler, sealing pads, and sealing oil. The stator cooling water system is also a closed-loop system, using high-purity cooling water to transfer heat from the stator windings back to the stator cooling water tank. The water is then pressurized by the stator cooling water pump, exchanged through the cooler, and then returned to the generator stator windings for heat absorption.

[0003] Under normal operating conditions, the generator's stator cooling water system cannot decompose and produce hydrogen. However, tests have shown that during normal operation of a water-hydrogen-cooled generator system, the operating pressure of hydrogen within the generator (0.4 MPa) is greater than the operating pressure of the cooling water (0.25 MPa). Therefore, trace amounts of hydrogen on the hydrogen side will always leak into the cooling water through micropores in the PTFE tubing. If there are problems with components in the stator water circuit within the generator (such as cracks in the hollow conductors, leaking water joints, sand holes in the water inlet pipes, water seepage in the manifold joints, or gasket failure), hydrogen can leak from these components into the cooling water system and dissolve. Once the hydrogen reaches saturation in the cooling water, it gradually precipitates in the cooling water tank with the flow of the cooling water, accumulates inside the tank, and is discharged from the top of the tank. This is considered an internal leak in the generator's hydrogen system. If the leakage is large enough, the hydrogen will not have time to dissolve and may flow directly back into the cooling water tank with the water flow. Alternatively, it may accumulate in certain generator piping, forming a vapor blockage, seriously threatening the generator's safe operation.

[0004] When a generator cooling water system leaks, hydrogen may escape, causing a safety accident. Therefore, real-time detection of hydrogen leakage in the generator cooling water system is of great significance.

[0005] The existing hydrogen leakage detection device for cooling water tanks has the following main problems: First, when detecting the leaked gas, it will affect the speed of gas circulation and discharge, increasing gas accumulation; second, under long-term operation, the water tank temperature is higher than the ambient temperature, and the gas condenses into small water droplets when discharged, causing corrosion to the sensor and affecting the measurement accuracy.

[0006] Therefore, a generator cooling water hydrogen leakage detection device is invented to solve the problems arising from the above-mentioned background technology. Utility Model Content

[0007] In order to solve the problems arising from the above background technology, a generator cooling water hydrogen leakage detection device is invented.

[0008] The utility model provides a generator cooling water hydrogen leakage detection device, comprising a cooling water tank, an exhaust pipe is provided at the exhaust end of the cooling water tank, wherein a pipeline flow meter is provided in the exhaust pipe, the other end of the exhaust pipe is connected to the external space, a first branch pipe is provided in the exhaust pipe, the air inlet end of the first branch pipe is located in the exhaust pipe, the exhaust end of the first branch pipe is connected to the exhaust pipe, a condenser is provided in the first branch pipe, a steam-water separator connected to the condenser is provided in the first branch pipe, and a hydrogen leakage sensor is provided at the outlet end of the steam-water separator for detecting the hydrogen content in the gas after passing through the condenser and the steam-water separator.

[0009] Preferably, a mixing mechanism is provided in the exhaust main pipe, and the mixing mechanism is used to evenly mix the gas in the pipe. The mixing mechanism includes a rotating body that can rotate in the exhaust main pipe, and the end of the rotating body close to the fixed cooling water tank is set to be conical, and the other end of the rotating body is provided with a spiral spiral groove. The gas in the exhaust main pipe drives the rotating body to rotate when passing through the rotating body.

[0010] Preferably, a concave ring is provided in the exhaust main pipe, and a rotatable rotating shaft is provided in the exhaust main pipe. The end of the rotating shaft close to the fixed cooling water tank passes through the concave ring and is fixedly connected to the rotating body.

[0011] Preferably, the cross-sectional area of ​​the first branch pipe is in a certain ratio to the cross-sectional area of ​​the exhaust main pipe.

[0012] The technical solution of the present invention can achieve the following beneficial effects:

[0013] (1) An exhaust pipe and a first branch pipe are provided. By arranging a hydrogen leakage sensor in the first branch pipe, the gas flowing through the exhaust pipe can be detected without affecting the flow of gas in the exhaust main pipe, thereby improving the flow of mixed gas, reducing gas accumulation, and reducing the measurement error of the hydrogen leakage sensor;

[0014] (2) Water vapor is removed through the condenser and steam-water separator, effectively avoiding water vapor corrosion and extending the service life of the hydrogen leakage sensor;

[0015] (3) A mixing mechanism is provided to facilitate mixing of various gases in the exhaust pipe, which is beneficial for measuring the amount of hydrogen leakage in the exhaust pipe; BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an axonometric drawing of the present invention.

[0017] Figure 2 It is the main view of the present utility model.

[0018] Figure 3 It is a top view of the utility model.

[0019] Figure 4 It is a front view full cutaway view of the present utility model.

[0020] Figure 5 It is an enlarged view of the mixing mechanism of the present utility model.

[0021] Among them, 1. Constant cooling water tank, 2. Exhaust main pipe, 3. Pipeline flow meter, 4. First branch pipe, 5. Condenser, 6. Steam-water separator, 7. Hydrogen leakage sensor, 8. Rotating body, 9. Concave ring, 10. Rotating shaft. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions of the various embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0023] In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0024] like Figures 1 to 5The generator cooling water hydrogen leakage detection device shown in the figure, a specific embodiment is, including a cooling water tank 1, the exhaust end of the cooling water tank 1 is connected to an exhaust pipe 2, the exhaust pipe 2 is used to discharge the gas generated by the cooling water tank 1, wherein a pipeline flow meter 3 is fixedly connected to the exhaust pipe 2, the pipeline flow meter 3 is located at the exhaust end of the cooling water tank 1, the pipeline flow meter 3 is a prior art, and its structure is not described in detail here, the pipeline flow meter 3 is used to monitor the gas flowing in the exhaust pipe 2, the other end of the exhaust pipe 2 is connected to the external space, the exhaust pipe 2 is fixedly connected to a first branch pipe 4, the air inlet end of the first branch pipe 4 is located in the exhaust pipe 2, and the gas flowing through the exhaust pipe 2 is The separated gas will enter the first branch pipe 4, the exhaust end of the first branch pipe 4 is connected to the exhaust main pipe 2, the first branch pipe 4 is fixedly connected with a condenser 5, the first branch pipe 4 is fixedly connected with a steam-water separator 6 connected to the condenser 5, the outlet end of the steam-water separator 6 is fixedly connected with a hydrogen leakage sensor 7 for detecting the hydrogen content in the gas after passing through the condenser 5 and the steam-water separator 6, the gas passing through the hydrogen leakage sensor 7 enters the exhaust main pipe 2, the gas entering the first branch pipe 4 passes through the condenser 5 and the steam-water separator 6 to remove impurities such as water vapor therein, to prevent the water vapor in the first branch pipe 4 from corroding the hydrogen leakage sensor 7, and finally the dry gas enters the hydrogen leakage sensor 7 for detection.

[0025] like Figures 1 to 5 The generator fixed cooling water hydrogen leakage detection device shown in the figure has a specific embodiment as follows: a mixing mechanism is provided in the exhaust main pipe 2, the mixing mechanism is used to uniformly mix the gas in the pipe, and the mixing mechanism includes a rotating body 8 that can rotate in the exhaust main pipe 2, and the rotating body 8 is opened into a cone shape at one end close to the fixed cooling water tank 1, and a spiral spiral groove is opened at the other end of the rotating body 8. When the gas in the exhaust main pipe 2 passes through the rotating body 8, the rotating body 8 is driven to rotate. Through the mixing mechanism, various gases in the exhaust main pipe 2 are easily mixed, which is beneficial to measure the amount of hydrogen leakage in the exhaust pipe.

[0026] like Figures 1 to 5 The generator cooling water hydrogen leakage detection device shown in the figure has a specific embodiment as follows: a concave ring 9 is fixedly connected to the exhaust main pipe 2, a rotatable rotating shaft 10 is rotatably connected to the exhaust main pipe 2, and the end of the rotating shaft 10 close to the cooling water tank 1 passes through the concave ring 9 and is fixedly connected to the rotating body 8. The gas passing through the rotating body 8 passes through the concave ring 9 and then enters the first branch pipe 4.

[0027] like Figures 1 to 5The generator cooling water hydrogen leakage detection device shown in the figure has a specific embodiment in which the cross-sectional area of ​​the first branch pipe 4 is in a certain ratio to the cross-sectional area of ​​the exhaust main pipe 2. Specifically, the ratio of the cross-sectional area of ​​the first branch pipe 4 to the cross-sectional area of ​​the exhaust main pipe 2 is 1:4. When the device is in use, the number and position of the exhaust main pipe 2, the condenser 5, the steam-water separator 6 and the hydrogen leakage sensor 7 can be adjusted as needed to adapt to generator cooling water tanks 1 of different models and specifications.

[0028] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A generator cooling water hydrogen leakage detection device, comprising a cooling water tank (1), wherein an exhaust pipe (2) is provided at the exhaust end of the cooling water tank (1), and characterized in that: A pipeline flowmeter (3) is provided in the exhaust main pipe (2), the other end of the exhaust main pipe (2) is connected to the external space, a first branch pipe (4) is provided in the exhaust main pipe (2), an air inlet end of the first branch pipe (4) is located in the exhaust main pipe (2), an exhaust end of the first branch pipe (4) is communicated with the exhaust main pipe (2), a condenser (5) is provided in the first branch pipe (4), a steam-water separator (6) connected to the condenser (5) is provided in the first branch pipe (4), and a hydrogen leakage sensor (7) is provided at the outlet end of the steam-water separator (6) for detecting the hydrogen content in the gas after passing through the condenser (5) and the steam-water separator (6).

2. The generator cooling water hydrogen leakage detection device according to claim 1, characterized in that: A mixing mechanism is provided in the exhaust main pipe (2), and the mixing mechanism is used to uniformly mix the gas in the pipe. The mixing mechanism includes a rotating body (8) that can rotate in the exhaust main pipe (2), and the rotating body (8) is configured to be conical at one end close to the fixed cooling water tank (1). The other end of the rotating body (8) is provided with a spiral groove. When the gas in the exhaust main pipe (2) passes through the rotating body (8), the rotating body (8) is driven to rotate.

3. The generator cooling water hydrogen leakage detection device according to claim 1, characterized in that: A concave ring (9) is provided in the exhaust main pipe (2), and a rotatable rotating shaft (10) is provided in the exhaust main pipe (2). The rotating shaft (10) passes through the concave ring (9) at one end close to the fixed cooling water tank (1) and is fixedly connected to the rotating body (8).

4. The generator cooling water hydrogen leakage detection device according to claim 1, characterized in that: The cross-sectional area of ​​the first branch pipe (4) is in a certain proportion to the cross-sectional area of ​​the exhaust main pipe (2).

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