Carbon dioxide supply device and gas replacement system for hydrogen-cooled generator

Abstract

The present invention discloses a carbon dioxide supply device for a hydrogen-cooled generator and a gas replacement system thereof, wherein the carbon dioxide supply device for a hydrogen-cooled generator comprises an air filling pipe, a plurality of carbon dioxide gas storage parts, a pressure reducer, a heating element and a temperature detection component, wherein the air filling pipe has an air supply port and an air inlet connected to the hydrogen-cooled generator; a plurality of the carbon dioxide gas storage parts are connected in parallel and connected to the air supply port; the pressure reducer is arranged on the air filling pipe; the heating element is arranged on the air filling pipe and is located between the air supply port and the pressure reducer; the temperature detection component is arranged on the air filling pipe and is arranged adjacent to the pressure reducer. The carbon dioxide supply device for a hydrogen-cooled generator of the technical solution of the present invention can effectively reduce the freezing of the pipeline and save energy.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen-cooled generators, and in particular to a carbon dioxide supply device for a hydrogen-cooled generator and a gas replacement system thereof. Background Art

[0002] At present, when hydrogen-cooled generators are shut down for inspection or maintenance, in order to avoid the mixing of air and hydrogen and the generation of explosive gas, carbon dioxide needs to be used as an intermediate isolation gas to replace the hydrogen, so as to prevent oil from entering the generator, prevent damage to the generator oil-water-hydrogen system equipment, reduce the amount of operation by operators, and improve the unit availability factor. However, when the existing hydrogen-cooled generators use the carbon dioxide replacement of the bus, the liquid carbon dioxide releases gas from the gas cylinder and absorbs a large amount of heat, causing the heat exchange valves and bus pipes to freeze, and the release speed is limited, affecting the safety of the unit, and prolonging the gas replacement time, affecting the start-up and shutdown time of the unit. Summary of the invention

[0003] The main purpose of the present invention is to provide a carbon dioxide supply device for a hydrogen-cooled generator, aiming to eliminate the freezing phenomenon during gas replacement and shorten the start-up and grid-connection time of the unit.

[0004] To achieve the above object, the carbon dioxide supply device for a hydrogen-cooled generator proposed in the present invention comprises:

[0005] An air charging pipe, the air charging pipe having an air supply port and an air inlet connected to the hydrogen-cooled generator;

[0006] A plurality of carbon dioxide gas storage components, which are connected in parallel and communicated with the gas supply port;

[0007] A pressure reducer, the pressure reducer being arranged on the inflation pipe;

[0008] A heating element, which is disposed in the inflation pipe and located between the air replenishment port and the pressure reducer; and

[0009] A temperature detection component is disposed in the inflation pipe and is adjacent to the pressure reducer.

[0010] In an optional embodiment, a heat-insulating component is further included, and the heat-insulating component is arranged around the outer periphery of the heating component.

[0011] In an optional embodiment, the thermal insulation component is made of rock wool tube, glass wool or silk wool.

[0012] In an optional embodiment, the heating element is an electric heating tape.

[0013] In an optional embodiment, the outer peripheral wall of the inflation pipe is provided with highland barley paper, and the heating element is arranged around the outer peripheral edge of the highland barley paper.

[0014] In an optional embodiment, the inflation pipe includes a first section and a second section connected to each other, the port of the second section away from the first section is the air inlet, the port of the first section away from the second section is the air supply port, and the first section includes two branch pipelines arranged in parallel, each of the branch pipelines is provided with the pressure reducer and the heater.

[0015] In an optional embodiment, the length range of the branch pipeline is 600 mm±10 mm.

[0016] In an optional embodiment, the length of the heating element is the same as the length of each of the branch pipelines.

[0017] In an optional embodiment, a control device is further included, wherein the control device is electrically connected to the heating element and the temperature detection component, respectively, so as to automatically control the start and stop of the heating element according to the detection result of the temperature detection component.

[0018] The present invention also provides a hydrogen-cooled generator gas replacement system, comprising a hydrogen-cooled generator and a carbon dioxide supply device for the hydrogen-cooled generator as described above, wherein the hydrogen-cooled generator has a receiving cavity connected to the air inlet.

[0019] The carbon dioxide supply device of the hydrogen-cooled generator of the technical solution of the present invention includes an air charging pipeline and a plurality of carbon dioxide gas storage parts connected to the air supply port thereof. The plurality of carbon dioxide gas storage parts are arranged in parallel, so as to form a busbar, realize centralized gas supply, facilitate maintenance, and improve production efficiency and safety. At the same time, a pressure reducer and a heating element are arranged on the air charging pipeline, which can heat the air charging pipeline after the gas is released from the carbon dioxide gas storage part, thereby increasing the gas temperature inside the pipeline, preventing water in the air from condensing on the pipeline, and then the heated gas flows through the pressure reducer without freezing the pressure reducer, thereby ensuring the release speed, improving safety, and shortening the start-up and grid-connected time of the hydrogen-cooled generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of pipeline connections of an embodiment of a carbon dioxide supply device for a hydrogen-cooled generator of the present invention;

[0022] Figure 2The figure is a schematic diagram of pipeline connections of an embodiment of a gas replacement system for a hydrogen-cooled generator of the present invention.

[0023] Description of Figure Numbers:

[0024]

[0025] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be 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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] Carbon dioxide gas is used as the intermediate isolation gas for replacing air and hydrogen during startup and shutdown. It is operated many times and takes a long time. During the entire carbon dioxide gas replacement, ice blockage is prone to occur in the pipeline and the pressure reducing valve. Usually, it is replaced by heating with a heating lamp, which is inefficient and prone to fire hazards. This application optimizes the layout of the pipeline and installs heating elements on the pipeline to eliminate the freezing of valves and pipelines during carbon dioxide replacement. It also installs a temperature sensing automatic detection device. When it is lower than the preset threshold, the heating element is automatically put into operation to ensure that the pipeline and the pressure reducing valve remain unobstructed, realizing that the gas replacement time of the generator is shortened from the original 24 hours to 16 hours. Each unit saves about 8 hours of gas replacement time, effectively improving work efficiency, saving manpower and improving safety. At the same time, it lays a solid foundation for the early grid-connected power generation of the unit after maintenance, and effectively solves the safety production problems that have plagued the company for a long time.

[0031] Please refer to Figure 1 In an embodiment of the present invention, the carbon dioxide supply device 10 of the hydrogen-cooled generator includes:

[0032] An air charging pipe 11, wherein the air charging pipe 11 has an air supply port 1111 and an air inlet 1131 communicating with the hydrogen-cooled generator 30;

[0033] A plurality of carbon dioxide gas storage components 13, wherein the plurality of carbon dioxide gas storage components 13 are connected in parallel and communicated with the gas replenishing port 1111;

[0034] A pressure reducer 15, wherein the pressure reducer 15 is arranged on the inflation pipe 11;

[0035] A heating element 17, wherein the heating element 17 is disposed in the inflation pipe 11 and is located between the air replenishment port 1111 and the pressure reducer 15; and

[0036] The temperature detection component 19 is disposed in the inflation pipe 11 and is adjacent to the pressure reducer 15 .

[0037] In this embodiment, the carbon dioxide gas storage component 13 can be a movable carbon dioxide high-pressure steel cylinder, or a carbon dioxide gas storage tank fixed at a certain position, which is not limited here. Multiple carbon dioxide gas storage components are arranged in parallel to form a carbon dioxide gas bus, that is, a device that brings together multiple gas containers to realize centralized gas supply, which can be easily fixed and simplify the fixing device, while also saving space, and can be centrally inspected and maintained to improve work efficiency and production safety. The bottle mouths or tank mouths of multiple carbon dioxide gas storage components 13 are connected to the gas replenishment port 1111 of the inflation pipeline 11 through pipes, and control valves are arranged on the multiple pipes to control the gas replenishment amount of each carbon dioxide gas storage component 13 for precise control; or a control valve is arranged at the gas replenishment port 1111 of the inflation pipeline 11 to centrally control whether carbon dioxide is replenished, which is convenient for control.

[0038] It is understandable that, because the pressure of the carbon dioxide released from the carbon dioxide storage member 13 is relatively high, it needs to be depressurized by the pressure reducer 15 before being transmitted to the air inlet 1131 to supply gas to the hydrogen-cooled generator 30. In the pipeline between the air supply port 1111 and the pressure reducer 15, carbon dioxide absorbs more heat, so a heating element 17 is provided on the inflation pipe 11 between the two, so that the inflation pipe 11 of this section can be heated, thereby effectively reducing the icing inside and outside the pipe. Here, the heating element 17 can be an electric heating tape, so that it can be directly wrapped around the outer periphery of the pipe, which is convenient for fixing and does not take up too much space. The heating speed is fast, which significantly improves the heating effect. Of course, in other embodiments, the heating element 17 can also be a heating resistor or other component that can heat the pipe.

[0039] In addition to the heating element 17, a temperature detection component 19 is also provided. The temperature detection component 19 is provided on the inflation pipe 11 and is provided near the pressure reducer 15, so that the temperature of the inflation pipe 11 around the pressure reducer 15 can be detected at any time, and the temperature of the inflation pipe 11 can be known at any time. When the temperature of the inflation pipe 11 is low, the heating element 17 is started again to heat the inflation pipe 11. In this way, energy consumption can be saved and heat waste caused by excessive heating of the heating element 17 can be prevented. The temperature detection component 19 can be a temperature sensor or a thermistor, etc., which is not limited here. In addition, when the distance is short, the air inlet 1131 of the inflation pipe 11 can be directly connected to the hydrogen-cooled generator 30; when the distance is far, it can also be connected to the hydrogen-cooled generator 30 through a pipeline.

[0040] The carbon dioxide supply device 10 of the hydrogen-cooled generator of the technical solution of the present invention includes an air charging pipe 11 and a plurality of carbon dioxide gas storage parts 13 connected to the air supply port 1111 thereof. The plurality of carbon dioxide gas storage parts 13 are arranged in parallel, so as to form a bus, realize centralized gas supply, facilitate maintenance, and improve production efficiency and safety. At the same time, a pressure reducer 15 and a heating element 17 are arranged on the air charging pipe 11, which can heat the air charging pipe 11 after the gas is released from the carbon dioxide gas storage part 13, thereby increasing the gas temperature inside the air, preventing water in the air from condensing on the pipe, and then the heated gas flows through the pressure reducer 15, and the pressure reducer 15 will not be frozen, thereby ensuring the release speed, improving safety, and shortening the start-up and grid-connected time of the hydrogen-cooled generator 30.

[0041] In an optional embodiment, a heat-insulating component 16 is further included, and the heat-insulating component 16 is arranged around the outer periphery of the heating component 17 .

[0042] In this embodiment, since the heating element 17 is located at the outer periphery of the inflation pipe 11, part of the heat will be wasted by exchanging with the surrounding air. Therefore, in order to improve the utilization rate of heat, a heat-insulating element 16 is provided around the outer periphery of the heating element 17, so that the heat generated by the heating element 17 can be insulated, so that the heat is slowly dissipated to the inflation pipe 11, ensuring the heating effect and effectively saving energy consumption. Specifically, in an optional embodiment, the material of the heat-insulating element 16 is at least one of rock wool tube, glass wool and silk wool. For example, the rock wool tube has a good heat-insulating effect, and also has good waterproof and fire-proof properties. The rock wool tube is also convenient to be installed on the outer periphery of the heating element 17, and plays a role in fixing the heating element 17, making the structure more stable.

[0043] In an optional embodiment, a barley paper 18 is attached to the outer peripheral wall of the inflation pipe 11 , and the heating element 17 is arranged around the outer peripheral edge of the barley paper 18 .

[0044] In this embodiment, in order to further improve the heat exchange performance between the heating element 17 and the inflation pipe 11, a highland barley paper 18 is sandwiched between the inflation pipe 11 and the heating element 17. The highland barley paper 18 has good mechanical strength and dielectric properties, and has good moisture absorption performance, and can quickly transfer the heat of the heating element 17 to the inflation pipe 11.

[0045] In an optional embodiment, the inflation pipe 11 includes a first section 111 and a second section 113 connected to each other, the port of the second section 113 away from the first section 111 is the air inlet 1131, the port of the first section 111 away from the second section 113 is the air replenishment port 1111, and the first section 111 includes two branch pipelines 1113 arranged in parallel, and each of the branch pipelines 1113 is provided with the pressure reducer 15 and the heating element 17.

[0046] In this embodiment, the gas charging pipeline 11 includes a first section 111 and a second section 113 connected to each other. The first section 111 is arranged near the carbon dioxide gas storage member 13, and the second end is arranged near the hydrogen-cooled generator 30. In order to ensure continuous gas supply, the first section 111 includes two branch pipelines 1113 arranged in parallel. Each branch pipeline 1113 is provided with a pressure reducer 15 and a heating element 17. When one branch pipeline 1113 needs to be repaired or maintained, another branch pipeline 1113 can be used, so as not to affect the gas supply to the hydrogen-cooled generator 30. Moreover, if multiple carbon dioxide gas storage members 13 are set as a group of gas supply components, two or three groups of parallel gas supply components can be set to connect with the first section 111, so as to increase the gas supply reserve of carbon dioxide and further improve the integration.

[0047] In an optional embodiment, the length range of the branch pipeline 1113 is 600 mm±10 mm.

[0048] In this embodiment, by lengthening the length of the branch pipeline 1113, the distance between the air supply port 1111 and the pressure reducer 15 can be increased, so that the carbon dioxide released from the air supply port 1111 can fully receive the heat of the heating element 17 and will not absorb too much heat from the air, thereby reducing the probability of ice or frost.

[0049] In an optional embodiment, the length of the heating element 17 is the same as the length of each branch pipeline 1113. Here, when the heating element 17 is an electric heating cable, when it is wrapped around the branch pipeline 1113, in order to further improve the heating effect, the length of the heating element 17 can be set to be the same as the length of the branch pipeline 1113, that is, the heating element 17 covers the entire branch pipeline 1113, of course, excluding the position of the pressure reducer 15, so that the contact area between the branch pipeline 1113 and the heating element 17 can be increased, so that each position of the branch pipeline 1113 is not easy to frost or ice.

[0050] In an optional embodiment, a control device is further included, which is electrically connected to the heating element 17 and the temperature detection component 19 respectively, so as to automatically control the start and stop of the heating element 17 according to the detection result of the temperature detection component 19.

[0051] In this embodiment, the control device can be set up separately, or the control device can be set up together with the control component of the product to which it is applied, and it can be electrically connected to the heating element 17 and the temperature detection component 19 at the same time, so that it can receive the detection result of the temperature detection component 19, and control the start and stop of the heating element 17 according to the detection result. In this way, there is no need for manual monitoring, and automatic control is realized, which saves labor costs and energy.

[0052] Specifically, the control process of the control device has the following steps:

[0053] S1: receiving the pipeline temperature detected by the temperature detection component 19;

[0054] Here, the temperature detection component 19 can be set to detect at a fixed time, or it can monitor in real time, or it can monitor in real time and send it to the control device regularly.

[0055] S2: Determine whether the pipeline temperature is lower than a preset threshold;

[0056] Here, the preset threshold is first set to 25°C±1°C, so that the received pipe temperature is compared with the preset threshold to determine whether the temperature of the inflation pipe 11 is too low.

[0057] S3: If yes, control the heating element 17 to heat the pipeline;

[0058] Here, if the pipe temperature is lower than the preset threshold, the heating element 17 can receive a heating signal from the control device, thereby heating the inflation pipe 11 to prevent frost or ice on the inflation pipe 11. The heating signal can also set the heating time limit and heating temperature, for example, heating for 15 minutes, and automatically stopping heating after reaching the required temperature. Of course, the control device can also receive the pipe temperature in real time, and when the required temperature is reached, send a signal to stop heating to the heating element 17, and the heating element 17 stops heating after receiving the signal.

[0059] S4: If not, continue to execute the step of “receiving the pipeline temperature detected by the temperature detection component 19”.

[0060] Here, if the pipeline temperature is not lower than the preset threshold, heating may not be performed, and the step of continuing to monitor the pipeline temperature is performed to carry out real-time prevention and control.

[0061] Please refer to Figure 2 The present invention further proposes a gas replacement system for a hydrogen-cooled generator 30, comprising a hydrogen-cooled generator 30 and a carbon dioxide supply device 10 for a hydrogen-cooled generator as described above, wherein the hydrogen-cooled generator 30 has a accommodating cavity connected to the air inlet 1131. Since the structure of the gas replacement system 100 for the hydrogen-cooled generator includes the structure of any of the carbon dioxide supply devices 10 for the hydrogen-cooled generators described above, the effective effects brought about by this will not be repeated here.

[0062] Among them, the gas replacement system 100 of the hydrogen-cooled generator also includes a hydrogen supply device 50 and a dehumidification device 70 or a drying device 90 for dehumidifying and drying hydrogen. The specific gas replacement process can refer to the existing gas replacement process, which will not be described in detail here. The gas replacement system 100 of the hydrogen-cooled generator optimizes the layout of the pipeline, increases the length of the bus pipe, installs a heating element 17 on the pipeline to eliminate the freezing of valves and pipelines during carbon dioxide replacement, insulates the pipeline, and installs a temperature sensing automatic detection device. When it is 25 degrees Celsius lower than the indoor temperature, the heating element 17 is automatically put into operation to ensure the smooth state of the pipeline and the pressure reducing valve, saving about 8 hours of gas replacement time. Based on a daily power generation income of 1.2 million, the replacement 8 hours in advance should increase the company's economic benefits by 400,000 and effectively improve work efficiency.

[0063] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A carbon dioxide supply device for a hydrogen-cooled generator, characterized in that: include: An air charging pipeline, the air charging pipeline having an air supply port and an air inlet connected to the hydrogen-cooled generator, the air charging pipeline comprising a first section and a second section connected to each other, the port of the second section away from the first section being the air inlet, the port of the first section away from the second section being the air supply port, the first section comprising two branch pipelines arranged in parallel, the length range of the branch pipelines being 600 mm ± 10 mm; A plurality of carbon dioxide gas storage components, which are connected in parallel and communicated with the gas supply port; A pressure reducer, the pressure reducer being arranged on the inflation pipe; A heating element, which is arranged in the inflation pipe and located between the air supply port and the pressure reducer, and the length of the heating element is the same as the length of each branch pipeline; a temperature detection component, the temperature detection component being disposed in the inflation pipe and adjacent to the pressure reducer; and Highland barley paper is attached to the outer peripheral wall of the inflation pipe, and the heating element is arranged around the outer peripheral edge of the highland barley paper.

2. The carbon dioxide supply device for a hydrogen-cooled generator according to claim 1, characterized in that: It also includes a heat-insulating component, which is arranged around the outer periphery of the heating component.

3. The carbon dioxide supply device for a hydrogen-cooled generator according to claim 2, characterized in that: The thermal insulation component is made of rock wool tube, glass wool or silk wool.

4. The carbon dioxide supply device for a hydrogen-cooled generator according to claim 1, characterized in that: The heating element is an electric heating tape.

5. The carbon dioxide supply device for a hydrogen-cooled generator according to claim 1, characterized in that: It also includes a control device, which is electrically connected to the heating element and the temperature detection component respectively, so as to automatically control the start and stop of the heating element according to the detection result of the temperature detection component.

6. A gas replacement system for a hydrogen-cooled generator, characterized in that: The invention comprises a hydrogen-cooled generator and a carbon dioxide supply device for the hydrogen-cooled generator according to any one of claims 1 to 5, wherein the hydrogen-cooled generator has a receiving cavity communicated with the air inlet.

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