A hydrogen leakage detection system for a generator area of a thermal power plant

Abstract

The utility model discloses a kind of thermal power plant generator area hydrogen leakage detection system, including the first hydrogen leakage monitoring probe being arranged in sealed container and multiple second hydrogen leakage monitoring probes being arranged outside the sealed container, multiple the second hydrogen leakage monitoring probe is distributed on hydrogen-cooled generator set, the first hydrogen leakage monitoring probe is located at the top of the sealed container, the range of the first hydrogen leakage monitoring probe is greater than the range of the second hydrogen leakage monitoring probe, the first hydrogen leakage monitoring probe and the second hydrogen leakage monitoring probe are connected with hydrogen leakage monitoring host computer. The utility model can be more accurate to the hydrogen leakage condition detection of entire hydrogen-cooled generator set, avoid data frequent overrun or alarm, and significantly improve hydrogen leakage detection success rate, can effectively reduce the security risk caused by generator area hydrogen leakage.

Description

Technical Field

[0001] This utility model belongs to the field of hydrogen leakage detection technology in generator areas, and particularly relates to a hydrogen leakage detection system for generator areas in thermal power plants. Background Technology

[0002] To prevent power production accidents, hydrogen leakage in key parts of hydrogen-cooled generator units in thermal power plants needs to be monitored in real time. Currently, in conventional thermal power plants, point-type hydrogen leakage sensors are usually installed at typical locations such as the stator cooling water tank, the sealing oil return pipeline, each phase of the generator enclosed bus, and the neutral point. The hydrogen leakage monitoring host collects the monitoring data from each sensor and outputs real-time data and alarm signals to the control system to monitor hydrogen leakage at each typical location. However, the applicant discovered that during actual operation, due to the complex operating environment of the hydrogen-cooled unit, hydrogen may leak through multiple pathways, including the stator cooling water system, end cover seals, and hydrogen pipelines. Furthermore, because the density of hydrogen is much lower than the average density of air, leaked hydrogen tends to accumulate in the water tank and inside the equipment casing, resulting in uneven distribution within the space. This means that the density of hydrogen varies significantly within the same space, leading to substantial discrepancies between point-based monitoring results and actual conditions. For example, at locations where hydrogen accumulates, the detection data frequently exceeds limits, rendering the monitoring ineffective. This can easily cause inaccurate hydrogen leakage monitoring data in the generator area, thereby affecting production or potentially causing production accidents. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a hydrogen leakage detection system for the generator area of ​​a thermal power plant. This system can more accurately detect hydrogen leakage in the entire hydrogen-cooled generator unit, avoid frequent data exceeding limits or alarms, and significantly improve the success rate of hydrogen leakage detection, thereby effectively reducing safety hazards caused by hydrogen leakage in the generator area.

[0004] The objective of this utility model is achieved through the following technical solution: A hydrogen leakage detection system for generator area in a thermal power plant includes a first hydrogen leakage monitoring probe installed inside a sealed container and a plurality of second hydrogen leakage monitoring probes installed outside the sealed container. The plurality of second hydrogen leakage monitoring probes are distributed on a hydrogen-cooled generator set. The first hydrogen leakage monitoring probe is located at the top of the sealed container. The range of the first hydrogen leakage monitoring probe is greater than the range of the second hydrogen leakage monitoring probes. Both the first and second hydrogen leakage monitoring probes are connected to a hydrogen leakage monitoring host. This implementation method utilizes two hydrogen leakage monitoring probes with different ranges, a first and a second, distributed in different areas to monitor hydrogen leakage in hydrogen-cooled generator units operating in complex environments. The larger-range first probe is positioned at the top of the sealed container to accurately monitor areas prone to hydrogen accumulation, preventing frequent data exceedances or alarms and significantly improving the operational guidance provided by the leakage detection data. Simultaneously, the smaller-range second probe monitors areas outside the sealed container of the hydrogen-cooled generator unit. Information collected by both probes is transmitted to the main hydrogen leakage monitoring unit for accurate monitoring of the entire area, significantly improving the success rate of leakage detection and effectively reducing safety hazards caused by hydrogen leakage in the generator area.

[0005] In one embodiment, the maximum range of the first hydrogen leakage monitoring probe is 20%.

[0006] In one embodiment, the maximum range of the second hydrogen leakage monitoring probe is 4%.

[0007] In one embodiment, the system further includes a flow rate and hydrogen concentration monitoring device disposed on the exhaust pipe of the sealed container, the flow rate and hydrogen concentration monitoring device being connected to a hydrogen leakage concentration integrator. This implementation method utilizes flow rate and hydrogen concentration monitoring devices in conjunction with a hydrogen leakage accumulation algorithm to calculate the actual hydrogen leakage concentration in the sealed container area, enabling operators to monitor the hydrogen leakage situation in localized areas of the sealed container of the hydrogen chiller unit.

[0008] In one embodiment, the hydrogen leakage concentration integrator is connected to the hydrogen leakage monitoring host; This embodiment transmits the actual hydrogen leakage concentration information of the sealed container area to the hydrogen leakage monitoring host to monitor the overall hydrogen cooling unit and the local hydrogen-prone areas, thereby improving the hydrogen leakage monitoring effect.

[0009] In one embodiment, an exhaust bypass is also provided in parallel on the exhaust pipe of the sealed container.

[0010] In one embodiment, both the first hydrogen leakage monitoring probe and the second hydrogen leakage monitoring probe are connected to the hydrogen leakage monitoring host via cables.

[0011] In one embodiment, both the inlet ends of the first hydrogen leakage monitoring probe and the second hydrogen leakage monitoring probe are connected to a condenser.

[0012] In one embodiment, the inlet ends of the first hydrogen leakage monitoring probe and the second hydrogen leakage monitoring probe are also connected to ball valves.

[0013] The beneficial effects of this utility model are as follows: This invention provides a hydrogen leakage detection system for the generator area of ​​a thermal power plant. It utilizes two hydrogen leakage monitoring probes with different ranges, a first probe and a second probe, distributed in different areas to monitor hydrogen leakage in hydrogen-cooled units operating in complex environments. The larger-range first probe is positioned at the top inside the sealed container, accurately monitoring areas where large amounts of hydrogen tend to accumulate, preventing frequent data exceedances or alarms, and significantly improving the guidance of hydrogen leakage detection data for operation. A flow rate and hydrogen concentration monitoring device installed on the exhaust pipe of the sealed container, combined with a hydrogen leakage integrator algorithm, calculates the actual hydrogen leakage concentration in the sealed container area, allowing operators to understand the hydrogen leakage situation in localized areas of the hydrogen-cooled unit's sealed container. Simultaneously, a smaller-range second probe monitors hydrogen leakage outside the sealed container of the hydrogen-cooled generator unit. The first and second probes, along with the hydrogen leakage concentration integrator, transmit the collected information to the main hydrogen leakage monitoring unit for accurate monitoring of the entire area's hydrogen leakage situation, significantly improving the success rate of hydrogen leakage detection and effectively reducing safety hazards caused by hydrogen leakage in the generator area. Attached Figure Description

[0014] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings. Wherein: Figure 1 A system schematic diagram of this utility model is shown; In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.

[0015] Figure label: 1-First hydrogen leakage monitoring probe, 2-Second hydrogen leakage monitoring probe, 3-Flow rate and hydrogen concentration monitoring device, 4-Cable, 5-Hydrogen leakage monitoring host, 6-Hydrogen leakage concentration integrator, 7-Condenser, 8-Ball valve, 9-Exhaust bypass, 10-Chilled water tank. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] This utility model provides a hydrogen leakage detection system for the generator area of ​​a thermal power plant, such as... Figure 1 As shown, it includes a first hydrogen leakage monitoring probe 1 installed inside a sealed container and multiple second hydrogen leakage monitoring probes 2 installed outside the sealed container. The multiple second hydrogen leakage monitoring probes 2 are distributed on the hydrogen-cooled generator set. The first hydrogen leakage monitoring probe 1 is located at the top of the sealed container. The range of the first hydrogen leakage monitoring probe 1 is greater than the range of the second hydrogen leakage monitoring probe 2. Both the first hydrogen leakage monitoring probe 1 and the second hydrogen leakage monitoring probe 2 are connected to the hydrogen leakage monitoring host 5. Specifically, the maximum range of the first hydrogen leakage monitoring probe 1 is 20%, the maximum range of the second hydrogen leakage monitoring probe 2 is 4%, and both the first hydrogen leakage monitoring probe 1 and the second hydrogen leakage monitoring probe 2 are connected to the hydrogen leakage monitoring host 5 via cable 4. It should be noted that in actual operation, due to the complex operating environment of the hydrogen-cooled unit, hydrogen may leak through multiple pathways, including the stator cooling water system, end cover seals, and hydrogen pipelines. Furthermore, because the density of hydrogen is much lower than the average density of air, leaked hydrogen tends to accumulate locally in sealed containers (such as inside the stator cooling water tank 10, the generator excitation casing, the turbine main oil tank, and the top of the equipment casing). In other words, the distribution of leaked hydrogen in space is uneven. In this embodiment, two different ranges of hydrogen leakage monitoring probes, a first hydrogen leakage monitoring probe 1 and a second hydrogen leakage monitoring probe 2, are distributed in different areas to monitor hydrogen leakage in the complex operating environment of the hydrogen-cooled unit. Specifically, the large-range first hydrogen leakage monitoring probe... The first hydrogen leak detection probe 1 is positioned at the top inside the sealed container to accurately monitor areas where large amounts of hydrogen are prone to accumulate, preventing frequent data exceedances or alarms. This significantly improves the guidance role of hydrogen leak detection data in operation. Simultaneously, it works in conjunction with a small-range second hydrogen leak detection probe 2 to monitor hydrogen leaks in areas outside the sealed container of the hydrogen-cooled generator set. The first and second hydrogen leak detection probes 1 and 2 transmit the collected information to the hydrogen leak monitoring host 5 to accurately monitor the hydrogen leak situation in the entire area and obtain the average hydrogen leak concentration information for the entire area. This facilitates operators in judging the actual hydrogen leak situation, significantly improves the success rate of hydrogen leak detection, and effectively reduces safety hazards caused by hydrogen leaks in the generator area.

[0018] In one embodiment, it also includes a flow and hydrogen concentration monitoring device 3 installed on the exhaust pipe of the sealed container. The flow and hydrogen concentration monitoring device 3 is connected to a hydrogen leakage concentration totalizer 6, the hydrogen leakage concentration totalizer 6 is connected to a hydrogen leakage monitoring host 5, and an exhaust bypass 9 is also installed in parallel on the exhaust pipe of the sealed container. It should be noted that the flow rate and hydrogen concentration monitoring device 3 installed on the exhaust pipe of the sealed container, together with the hydrogen leakage totalization algorithm, calculates the actual hydrogen leakage concentration in the sealed container area, that is, obtains the hydrogen leakage concentration in the local area of ​​the sealed container. The hydrogen leakage concentration totalizer 6 is connected to the hydrogen leakage monitoring host 5 to transmit the calculated local area hydrogen leakage concentration information to the monitoring host, so that the operator can grasp the hydrogen leakage situation in the local area of ​​the sealed container of the hydrogen-cooled unit. That is, the average hydrogen leakage concentration information of the entire hydrogen-cooled generator unit area can be used to judge the hydrogen leakage situation of the hydrogen-cooled generator unit and / or the hydrogen leakage concentration information of the local area of ​​the sealed container can be used to judge the hydrogen leakage situation of the hydrogen-cooled generator unit, thus ensuring the safe production of the thermal power plant. In one embodiment, the inlet ends of both the first hydrogen leakage monitoring probe 1 and the second hydrogen leakage monitoring probe 2 are connected to a condenser 7, and the inlet ends of both the first hydrogen leakage monitoring probe 1 and the second hydrogen leakage monitoring probe 2 are also connected to a ball valve 8. That is, after the hydrogen is condensed by the condenser 7, it enters the first hydrogen leakage monitoring probe 1 or the second hydrogen leakage monitoring probe 2 for hydrogen concentration monitoring.

[0019] In the description of this utility model, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] While specific embodiments of the present invention have been described herein with reference to them, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A hydrogen leakage detection system for the generator area of ​​a thermal power plant, characterized in that, The device includes a first hydrogen leakage monitoring probe installed inside a sealed container and multiple second hydrogen leakage monitoring probes installed outside the sealed container. The multiple second hydrogen leakage monitoring probes are distributed on the hydrogen-cooled generator set. The first hydrogen leakage monitoring probe is located at the top of the sealed container. The range of the first hydrogen leakage monitoring probe is greater than the range of the second hydrogen leakage monitoring probes. Both the first and second hydrogen leakage monitoring probes are connected to a hydrogen leakage monitoring host.

2. The hydrogen leakage detection system for the generator area of ​​a thermal power plant according to claim 1, characterized in that, The maximum range of the first hydrogen leakage monitoring probe is 20%.

3. A hydrogen leakage detection system for the generator area of ​​a thermal power plant according to claim 1 or 2, characterized in that, The maximum range of the second hydrogen leakage monitoring probe is 4.

4. A hydrogen leakage detection system for generator area in a thermal power plant according to claim 1, characterized in that, It also includes a flow rate and hydrogen concentration monitoring device installed on the exhaust pipe of the sealed container, the flow rate and hydrogen concentration monitoring device being connected to a hydrogen leakage concentration integrator.

5. A hydrogen leakage detection system for generator area in a thermal power plant according to claim 4, characterized in that, The hydrogen leakage concentration integrator is connected to the hydrogen leakage monitoring host.

6. A hydrogen leakage detection system for generator area in a thermal power plant according to claim 4, characterized in that, An exhaust bypass is also connected in parallel on the exhaust pipe of the sealed container.

7. A hydrogen leakage detection system for generator area in a thermal power plant according to claim 1, characterized in that, Both the first hydrogen leakage monitoring probe and the second hydrogen leakage monitoring probe are connected to the hydrogen leakage monitoring host via cables.

8. A hydrogen leakage detection system for generator area in a thermal power plant according to claim 1, characterized in that, The inlet ends of both the first and second hydrogen leakage monitoring probes are connected to condensers.

9. A hydrogen leakage detection system for the generator area of ​​a thermal power plant according to claim 1 or 8, characterized in that, The inlet ends of the first hydrogen leakage monitoring probe and the second hydrogen leakage monitoring probe are also connected to ball valves.

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