A nitrogen detector for DC power station converter valve cooling system

Abstract

A nitrogen detector for a converter valve cooling system in a DC power station belongs to the technical field of detection instruments and includes a detection part and a movable part. The detection part includes a nitrogen detection sensor, a controller, and three detection modules. The data output end of the nitrogen detection sensor is connected to the first data acquisition end of the controller. The data output end of the first detection module is connected to the second data acquisition end of the controller. The data output end of the second detection module is connected to the third data acquisition end of the controller. The data output end of the third detection module is connected to the fourth data acquisition end of the controller. The first output end of the controller is connected to an alarm module. The detection part is arranged on the movable part. The instrument can detect accidental nitrogen leaks or normal nitrogen emissions. It can be moved between two locations prone to leakage, making it easier to detect whether there is a leak, improving the efficiency of equipment use, and increasing the alarm accuracy, thereby ensuring the safety of personnel and equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of detection instruments, and in particular relates to a nitrogen detector for a converter valve cooling system of a DC power station. Background Art

[0002] Nitrogen leakage sometimes occurs in the cooling system of the converter valves in current DC power plants, but there is no alarm system. Nitrogen leakage can be divided into two situations: normal nitrogen emissions and accidental nitrogen leaks, which are usually difficult to distinguish. Summary of the Invention

[0003] The object of the present invention is to provide a nitrogen detector for a DC power station converter valve cooling system, which can detect accidental nitrogen leakage or normal nitrogen emission.

[0004] The nitrogen system is part of the converter valve cooling system and is used to stabilize the pressure of the entire valve cooling system, maintaining a positive pressure throughout the system. This is used to compensate for operating losses, thermal expansion, and contraction.

[0005] The technical solution adopted is:

[0006] A nitrogen detector for a converter valve cooling system of a DC power station comprises a detection part.

[0007] The technical points are:

[0008] The detection part includes a nitrogen detection sensor, a controller, a first detection module, a second detection module / a third detection module and an alarm module.

[0009] The data output terminal of the nitrogen detection sensor is connected to the first data acquisition terminal of the controller.

[0010] The data output terminal of the first detection module is connected to the second data acquisition terminal of the controller.

[0011] The data output terminal of the second detection module is connected to the third data acquisition terminal of the controller.

[0012] The data output terminal of the third detection module is connected to the fourth data acquisition terminal of the controller.

[0013] The first output terminal of the controller is connected to the alarm module.

[0014] The first detection module is used to detect whether the electric three-way valve of the converter valve cooling system is actuated.

[0015] The second detection module is used to detect whether the external air cooling fan of the converter valve cooling system is switched.

[0016] The third detection module is used to detect whether the main circulation pump of the converter valve cooling system is started or stopped.

[0017] The alarm module is used for alarm.

[0018] The controller processes the collected data and outputs an alarm signal to the alarm module.

[0019] The detecting portion is provided on the moving portion.

[0020] Its advantages are:

[0021] This device determines nitrogen exposure based on the alarm condition.

[0022] There are three situations where the controller will not issue an alarm during status confirmation: 1. Whether the electric three-way valve of the converter valve cooling system is actuated. 2. Whether the external air cooling fan is started or stopped. 3. Whether the main circulation pump is switched on or off.

[0023] Any nitrogen leakage detected by the nitrogen detection sensor in any of the three situations other than those mentioned above is an abnormal leakage, which requires on-site detection of the leak point and timely treatment.

[0024] Therefore, this instrument can detect accidental nitrogen leaks or normal nitrogen emissions.

[0025] In addition, the device can be moved between two locations prone to leakage, making it easier to detect whether there is a leak, improving the efficiency of equipment use, and increasing the alarm accuracy, thereby ensuring the safety of personnel and equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is the circuit schematic diagram of the detection part.

[0027] Figure 2 Schematic diagram of the structure of the moving part.

[0028] Figure 3 A top view of the guide rail.

[0029] Figure 4 A side view of the guide rail.

[0030] First detection module 1, second detection module 2, third detection module 3, nitrogen detection sensor 4, controller, guide rail 5, slider 6, nitrogen bottle 7, alarm module 8, expansion tank 9.

[0031] Support plate 10 , lead screw 11 , shaft seat 12 , coupling 13 , motor housing 14 , guide bar 15 , guide groove 16 . DETAILED DESCRIPTION

[0032] It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present application may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs.

[0033] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0034] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of this application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for clarity, the thickness of layers and regions is exaggerated, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0035] The nitrogen system is part of the converter valve cooling system and is used to stabilize the pressure of the entire valve cooling system, maintaining a positive pressure throughout the system. This is used to compensate for operating losses, thermal expansion, and contraction.

[0036] An embodiment of the present application provides a nitrogen detector for a DC power station converter valve cooling system, including a detection part.

[0037] The detection part includes a nitrogen detection sensor 4, a controller, a first detection module 1, a second detection module 2 and a third detection module 3.

[0038] The nitrogen detection sensor 4, controller, first detection module 1, second detection module 2 and third detection module 3 are arranged in a shell, and the shell can be fixed to a fixed position by screws, such as a wall, and the probe of the nitrogen detection sensor 4 extends out of the shell.

[0039] The data output terminal of the nitrogen detection sensor 4 is connected to the first data acquisition terminal of the controller.

[0040] The data output terminal of the first detection module 1 is connected to the second data acquisition terminal of the controller.

[0041] The data output terminal of the second detection module 2 is connected to the third data acquisition terminal of the controller.

[0042] The data output terminal of the third detection module 3 is connected to the fourth data acquisition terminal of the controller. The first output terminal of the controller is connected to the alarm module 8.

[0043] The first detection module 1 is used to detect whether the electric three-way valve of the converter valve cooling system is in operation.

[0044] The second detection module 2 is used to detect whether the external air cooling fan of the converter valve cooling system is switched.

[0045] The third detection module 3 is used to detect whether the main circulation pump of the converter valve cooling system is started or stopped.

[0046] The nitrogen detection sensor 4 is used to detect nitrogen in the environment.

[0047] The alarm module 8 is used for alarming.

[0048] When the nitrogen detection sensor 4 is used to detect nitrogen in the environment, the controller determines that if at least one of the first detection module 1, the second detection module 2 and the third detection module 3 detects a signal, no alarm is issued.

[0049] When the nitrogen detection sensor 4 is used to detect nitrogen in the environment, the controller determines that if any one of the first detection module 1, the second detection module 2 and the third detection module 3 does not detect a signal, an alarm is issued.

[0050] The controller processes the collected data and outputs an alarm signal to the alarm module.

[0051] The controller may be a PLC.

[0052] Furthermore, a nitrogen detector for a DC power station converter valve cooling system also includes a moving part, which includes a guide rail 5. The original components of the detection part are arranged on a corresponding circuit board, installed in a shell, and then fixed to a slider 6 of the guide rail 5 by screws. The guide rail 5 is arranged between a nitrogen bottle 7 and an expansion tank 9.

[0053] The guide rail 5 includes a support plate 10 and a lead screw 11 .

[0054] Both ends of the lead screw 11 are arranged on the support plate 10 through the shaft seat 12, the motor housing 14 is fixed to one side of the support plate 10, and the motor output shaft is fixedly connected to one end of the lead screw 11 through the coupling 13.

[0055] The slider 6 is threadedly connected to the lead screw 11 .

[0056] A guide bar 15 is provided at the bottom of the support plate 10 , and a guide groove 16 is provided at the bottom of the slider 6 . The guide groove 16 and the guide bar 15 are slidably matched.

[0057] The motor shaft drives the lead screw 11 to rotate, and the slider 6 moves back and forth along the lead screw 11 under the cooperative guidance of the guide groove 16 and the guide bar 15.

[0058] Nitrogen cylinder 7 in the converter valve cooling system may leak after replacement, and the expansion tank 9 in the converter valve cooling system has an exhaust valve that may also leak. Therefore, using an electric guide rail to move between these two positions at a fixed time or temporarily moved by personnel can improve detection efficiency. Guide rail 5 can be supported on the ground using a bracket.

[0059] Furthermore, the second output end of the controller of the detection part can also be connected to a data storage module for storing data. The first detection module 1 is electrically connected to the electric three-way valve of the converter valve cooling system.

[0060] The second detection module 2 is electrically connected to the external air cooling fan of the converter valve cooling system.

[0061] The third detection module 3 is electrically connected to the main circulation pump of the converter valve cooling system.

[0062] This device determines nitrogen exposure based on the alarm condition.

[0063] There are three situations in which the controller will not issue an alarm during status verification: 1. Whether the electric three-way valve of the converter valve cooling system is operating. 2. Whether the external air cooling fan is started or stopped. 3. Whether the main circulation pump is switched. No alarm will be issued if the status of the electric three-way valve, external air cooling fan, and / or main circulation pump changes.

[0064] In the cases other than the above three, any nitrogen leakage detected by the nitrogen detection sensor 4 is an abnormal leakage, which requires on-site detection of the leakage point and timely treatment.

[0065] The electric three-way valve of the converter valve cooling system, whether to start or stop the external air cooling fan, and the connection and use of the main circulation pump are all known technologies.

[0066] 1. When the outside temperature is lower than the set temperature, for example 28 degrees Celsius, close the electric three-way valve.

[0067] When the outside temperature is higher than the set temperature, for example 28 degrees Celsius, the electric three-way valve is opened.

[0068] The operation of the electric three-way valve will cause the pressure of the entire system to change, and a nitrogen pressure stabilizing system is required to replenish water.

[0069] 2. The start and stop of the outdoor air cooling fan will cause great thermal expansion and contraction, and water needs to be added.

[0070] 3. When switching the main circulation pump, because the pump is based on the eddy current principle, the switching will definitely cause water level changes and water replenishment is also required.

[0071] Those skilled in the art can implement this technical solution by themselves according to the teachings of the specification.

[0072] This technical solution uses three detection modules to detect whether the nitrogen emission is normal to distinguish whether the nitrogen detection sensor will alarm after detecting nitrogen.

[0073] And data can be stored in the storage module.

[0074] Furthermore, a new design is created which uses a moving part to move the detection part between the expansion tank 9 and the nitrogen cylinder 7, thus overcoming the shortcoming of the conventional detection table having a fixed position and lacking flexibility.

[0075] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A nitrogen detector for a DC power station converter valve cooling system, comprising a detection section, characterized in that: The detection part includes a nitrogen detection sensor (4), a controller, a first detection module (1), a second detection module (2), a third detection module (3) and an alarm module (8); The data output terminal of the nitrogen detection sensor (4) is connected to the first data acquisition terminal of the controller; The data output terminal of the first detection module (1) is connected to the second data acquisition terminal of the controller; The data output terminal of the second detection module (2) is connected to the third data acquisition terminal of the controller; The data output terminal of the third detection module (3) is connected to the fourth data acquisition terminal of the controller; The first output terminal of the controller is connected to an alarm module (8); The first detection module (1) is used to detect whether the electric three-way valve of the converter valve cooling system is in operation; The second detection module (2) is used to detect whether the external air cooling fan of the converter valve cooling system is switched; The third detection module (3) is used to detect whether the main circulation pump of the converter valve cooling system is started or stopped; The alarm module (8) is used for alarming; it also includes a moving mechanism, The detection part is arranged on the moving part; The moving part includes a guide rail (5), the detection part is arranged on a slider (6) of the guide rail (5), and the guide rail (5) is used to be arranged between the nitrogen bottle (7) and the expansion tank (9); The guide rail (5) includes a support plate (10) and a lead screw (11); Both ends of the lead screw (11) are arranged on the support plate (10) through the shaft seat (12), the motor housing (14) is fixed to one side of the support plate (10), and the motor output shaft is fixedly connected to one end of the lead screw (11) through the coupling (13); The lead screw (11) is threadedly connected with a slider (6); A guide bar (15) is provided at the bottom of the support plate (10), and a guide groove (16) is provided at the bottom of the slider (6). The guide groove (16) and the guide bar (15) are slidably matched.

2. The nitrogen detector for a DC power station converter valve cooling system according to claim 1, characterized in that: The second output end of the controller is also connected to a data storage module for storing data.

3. A nitrogen detector for a DC power station converter valve cooling system according to claim 1 or 2, characterized in that: The controller is PLC.

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