Double-pipeline adjusting system for hydrogen-doped gas user

Abstract

The utility model discloses a hydrogen-doped gas user double-pipeline adjusting system, which is used in one or more terminal user units, and at least comprises a gas inlet pipeline, a gas outlet pipeline, a gas outlet pipeline, a gas outlet pipeline and a gas outlet pipeline, the gas inlet pipeline provides a hydrogen-doped gas source for each terminal user unit, a plurality of user terminals are arranged in each terminal user unit, and gas supply is controlled through a gas inlet valve and a user valve; and the air return pipeline collects return air when one or some user valves are closed, and each user terminal controls the return air through a bypass valve and an air return valve. According to the utility model, the gas inlet pipeline and the gas return pipeline are arranged, so that uninterrupted flow of gas in a pipeline system can be realized by utilizing the bypass pipeline and the corresponding bypass valve when gas supply is stopped, and the requirements of gas quality uniformity and hydrogen mixing proportion at any position in the system are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas hydrogen-blended application, in particular to a double-pipeline regulating system for hydrogen-blended fuel gas users. Background Art

[0002] As a renewable secondary energy source, hydrogen has the advantages of wide sources, clean and efficient, and rich application scenarios. The role of hydrogen in the world's energy transformation is becoming increasingly prominent. Blending hydrogen into natural gas for transportation or use is an effective way to achieve the rapid development of the hydrogen energy industry and the goals of carbon peak and carbon neutrality. Direct combustion of natural gas after mixing with hydrogen not only reduces the emission of pollutants such as carbon dioxide and nitrogen oxides, but also effectively improves the combustion performance of equipment.

[0003] There are technical solutions in the prior art for blending hydrogen into natural gas for transportation or utilization. For example, Chinese patent CN219510607U discloses a hydrogen transmission and distribution system for blending natural gas with hydrogen, including a safety relief valve, a conical filter, a mass flow meter, a flow regulating valve, an emergency vent valve and an emergency shut-off valve and corresponding instruments. It is used for hydrogen-blended gas turbine power generation, with stable, safe and reliable operation, and meets the gas quality and gas volume requirements of the gas turbine. This solution is mainly used for industrial needs. Although this type of solution can meet the index requirements of power station gas turbines for blending natural gas with hydrogen, it does not consider countermeasures under special circumstances.

[0004] Whether it is for industrial gas turbines or civil fuel appliances, hydrogen is mixed with natural gas for direct use. Due to the limitations of technical conditions, terminal equipment has certain requirements for the proportion of hydrogen mixed in natural gas. Under normal circumstances, hydrogen can be injected into the natural gas transmission system according to the mixing ratio required by the equipment to supply terminal equipment. However, for some terminals such as gas users where gas use is intermittent, due to the differences in physical properties such as the density of natural gas and hydrogen, uneven gas and gas mixing will occur in the gas supply network during the period when the user stops using gas. Therefore, when the user uses gas again and reactivates the fuel appliance, the gas-hydrogen mixing ratio may not meet the equipment requirements, thereby affecting the service life of the equipment and even causing safety accidents such as explosions. How to ensure that the gas quality of hydrogen-mixed gas always meets user requirements is a problem that must be solved in the current use of natural gas blended with hydrogen.

[0005] Therefore, there is an urgent need for a dual-pipeline regulation system for hydrogen-blended fuel gas users, which can effectively solve the problem of uneven gas quality caused by intermittent gas use by users, thereby affecting the performance of terminal equipment.

[0006] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0007] The utility model aims to provide a dual-pipeline regulating system for hydrogen-blended fuel gas users. By setting dual pipelines for air inlet and air return, during the period of gas supply suspension, a bypass line and a corresponding bypass valve can be used to achieve uninterrupted flow of gas in the pipeline system, thereby ensuring the uniformity of gas quality and the hydrogen mixing ratio requirements at any position in the system.

[0008] To achieve the above-mentioned purpose, the utility model provides a dual-pipeline regulation system for hydrogen-blended fuel gas users, which is used in one or more terminal user units and at least includes: an intake pipeline, which provides a hydrogen-blended fuel gas source for each terminal user unit, each terminal user unit is provided with multiple user terminals and the gas supply is controlled by an intake valve and a user valve; a return gas pipeline, which collects return gas when one or some user valves are closed, and each user terminal controls the return gas through a bypass valve and a return gas valve.

[0009] Furthermore, in the above technical solution, under the air supply condition, the air inlet valve and the air return valve are both in an open state.

[0010] Furthermore, in the above technical solution, when the user terminal uses gas, the corresponding user valve is in an open state and the corresponding bypass valve is in a closed state; when the user terminal stops using gas, the corresponding user valve is in a closed state and the corresponding bypass valve is in an open state.

[0011] Furthermore, in the above technical solution, when the user terminal stops using gas for a first preset time, the opening of the bypass valve can be gradually reduced until it is completely closed.

[0012] Furthermore, in the above technical solution, when the user terminal resumes gas use, if the opening of the corresponding bypass valve is less than 1 / 2 at this time, the bypass valve is opened, and after a second preset time, the corresponding user valve is in a fully open state, and the bypass valve is in a closed state.

[0013] Furthermore, in the above technical solution, when all user valves and bypass valves in a terminal user unit are in a closed state, the air intake valve and air return valve corresponding to the terminal user unit are automatically closed according to a set time interval, and the user unit is converted to a stop gas supply condition.

[0014] Furthermore, in the above technical solution, when any user terminal in the terminal user unit resumes gas use, the air intake valve, the air return valve and the corresponding bypass valve of the terminal user unit are opened in sequence. After the second preset time, the user valve of the user terminal is opened and the corresponding bypass valve is closed at the same time.

[0015] Furthermore, in the above technical solution, the system may also include a controller for automatically controlling the opening and closing of the intake valve, the user valve, the bypass valve, the return valve, and the opening degree of the bypass valve.

[0016] Furthermore, in the above technical solution, a circulating compressor may be provided on the return air pipeline to compress the hydrogen-blended fuel gas collected in the return air pipeline and then send it back into the intake air pipeline.

[0017] Furthermore, in the above technical solution, a first check valve may be provided upstream of the air intake pipeline, and a second check valve and a third check valve may be provided upstream and downstream of the circulating compressor, respectively.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] 1) The utility model sets up dual air intake and return pipelines. During the air supply period, air is supplied through the air intake valve and the user valve of each user terminal; during the stop of air supply, the bypass pipeline and the corresponding bypass valve and return valve can be used to realize the uninterrupted flow of gas in the pipeline system, thereby effectively ensuring the uniformity of gas quality and the requirements of hydrogen mixing ratio at any position in the system;

[0020] 2) The utility model can further ensure the uniformity of gas quality and the requirements of hydrogen mixing ratio at any position in the system by controlling each valve in the double pipeline through the controller, and ensure the stability and reliability of the gas equipment when the user uses gas;

[0021] 3) The utility model can determine the opening and closing of the corresponding bypass valve according to the gas usage frequency of the user. For users or user units that are out of service for a long time, it can effectively save the operating energy consumption of the gas supply pipeline, reduce the overall operating risk of the pipeline network, and has certain safety and economic benefits;

[0022] 4) The utility model provides a circulating compressor on the return air pipeline, so that the loop gas only needs to be slightly pressurized to be injected back into the intake pipeline, which eliminates resource waste and reduces the energy consumption of the pipeline network operation;

[0023] 5) The dual-pipeline regulating system for hydrogen-blended fuel gas users of the utility model has simple process, easy operation, and does not require the installation of complex equipment. It can be realized by simply modifying the existing fuel gas pipeline network.

[0024] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, and at the same time to make the above and other purposes, technical features and advantages of the utility model easier to understand, one or more preferred embodiments are listed below and described in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1It is a connection schematic diagram of a dual-pipeline regulating system for hydrogen-blended fuel gas users of the utility model (showing that one user unit includes six users).

[0026] Figure 2 This is a connection diagram of the utility model hydrogen-blended fuel gas user dual-pipeline regulating system applied to multiple user units (three user units are shown).

[0027] Description of main reference numerals:

[0028] 1-intake valve, 2-user valve, 3-bypass valve, 4-return valve, 5-first check valve, 6-second check valve, 7-circulation compressor, 8-third check valve. DETAILED DESCRIPTION

[0029] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0030] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0031] In this document, for the convenience of description, spatial relative terms such as "below", "below", "down", "above", "above", "upper", etc. may be used to describe the relationship between one element or feature and another element or feature in the accompanying drawings. It should be understood that the spatial relative terms are intended to include different orientations of the object in use or operation in addition to the orientation depicted in the figure. For example, if the object in the figure is turned over, the element described as being "below" or "below" other elements or features will be oriented "above" the element or feature. Therefore, the exemplary term "below" can include both below and above. Objects may also have other orientations (rotated 90 degrees or other orientations) and the spatial relative terms used in this document should be interpreted accordingly.

[0032] In this document, the terms "first", "second", etc. are used to distinguish two different elements or parts, and are not used to limit a specific position or relative relationship. In other words, in some embodiments, the terms "first", "second", etc. can also be interchangeable.

[0033] like Figure 1 , 2 As shown, the utility model provides a dual-pipeline regulation system for hydrogen-blended gas users, which can be used in one or more terminal user units ( Figure 1 Schematic diagram of an end user unit; Figure 2The system includes at least an air inlet pipeline and an air return pipeline, which is also known as the "double pipeline" of the utility model. The air inlet pipeline provides a hydrogen-blended fuel gas source for each end-user unit (see Figure 2 ), each terminal user unit is provided with multiple user terminals ( Figure 1 6 are shown in the figure) and the gas supply is controlled by the intake valve 1 and the user valve 2. Each user terminal is equipped with a corresponding user valve. The return gas pipeline collects the return gas when one or some user valves 2 are closed. Each user terminal controls the return gas through the bypass valve 3 and the return gas valve 4. Each user terminal is equipped with a corresponding bypass valve.

[0034] The utility model sets up double air intake and return pipelines. During the air supply period, air is supplied through the air intake valve 1 and the user valve 2 of each user terminal. During the stop of the air supply, the bypass line and the corresponding bypass valve 3 and the return valve 4 can be used to realize the uninterrupted flow of gas in the pipeline system, thereby effectively ensuring the uniformity of gas quality and the hydrogen mixing ratio requirements at any position in the system.

[0035] The hydrogen-blended fuel gas user dual-pipeline regulation system of the utility model may also include a controller (not shown in the figure), which can be used to automatically control the opening and closing of the intake valve 1, the user valve 2, the bypass valve 3, and the return valve 4, and automatically control the opening of the bypass valve 3 as needed.

[0036] Further Figure 1 As shown, in the dual-pipeline regulation system of the utility model, the air inlet valve 1 and the air return valve 4 are both in the open state under the air supply condition. Figure 1 When user 1) uses gas, the corresponding user valve 2 is in an open state, and the corresponding bypass valve 3 is in a closed state; when the user terminal stops using gas, the user valve 2 of the user 1 is in a closed state, and the bypass valve 3 of the user 1 is in an open state. In this way, the hydrogen-blended fuel gas in the pipeline can always be in a flowing state. When the user terminal stops using gas for a first preset time, the controller controls the opening of the bypass valve 3 to gradually decrease until it is completely closed, that is, as the user valve closing time increases, the bypass valve opening gradually decreases until it is completely closed. The first preset time can be set according to actual needs (such as the length of the bypass pipeline) to ensure the stability of the return gas and the uniformity of the gas quality in the pipeline.

[0037] Further, when the user terminal resumes gas use, if the opening of the bypass valve 3 of the user is less than 1 / 2 at this time, the bypass valve 3 is opened, and after the second preset time, the user valve 2 of the user is in a fully open state, and the bypass valve 3 is in a closed state. The second preset time can also be set according to actual needs (such as the length of the bypass pipeline). Through such a setting method, the stability of gas supply and the uniformity of gas quality in the pipeline can be guaranteed.

[0038] Further, when all user valves 2 and bypass valves 3 (reference Figure 1 When the six user valves and six bypass valves in the terminal user unit are all in the closed state, the air intake valve 1 and the air return valve 4 corresponding to the terminal user unit can be automatically closed according to the set time interval (for example, 15 days). At this time, the user unit is converted to the gas supply stop state. When any user terminal in the terminal user unit that has stopped gas supply resumes gas use, the air intake valve 1, the air return valve 4 of the terminal user unit and the bypass valve 3 corresponding to the user terminal that resumes gas use are opened in sequence. After the aforementioned second preset time, the user valve 2 of the user terminal is opened, and the corresponding bypass valve 3 is closed at the same time.

[0039] The preferred control logic of the controller in the present invention is as follows:

[0040] When the user resumes using gas and opens the user valve 2, the controller's built-in timer is reset and the corresponding bypass valve 3 opening is identified at the same time: if the bypass valve 3 is closed, the controller further determines the intake valve 1 and return valve 4 of the user unit. If the intake valve and return valve are both closed, the controller opens the intake valve 1, return valve 4 and the corresponding bypass valve 3 in sequence, otherwise only the bypass valve 3 needs to be opened; if the bypass valve 3 opening is less than 1 / 2, the controller controls to increase the bypass valve opening until it is fully opened. After the bypass valve is opened for 1 minute, the user valve 2 performs the opening action and the bypass valve 3 is immediately closed.

[0041] When the user stops using gas and closes the user valve 2, the controller starts the timer and controls the bypass valve 3 to open. When the timer counts to 48 hours, that is, the user valve is closed for more than 2 days, the controller starts to reduce the bypass valve opening at a certain preset speed until it is completely closed. When the timer counts to 360 hours, that is, the user valve is closed for more than 15 days, the controller determines whether other user valves and bypass valves in the user unit are all closed. If so, the corresponding intake valve and return valve of the user unit are closed.

[0042] The utility model controls each valve in the dual pipelines through the controller, which can further ensure the uniformity of gas quality and the hydrogen mixing ratio requirements at any position in the system, and ensure the stability and reliability of the gas equipment when the user uses gas; at the same time, the opening and closing of the corresponding bypass valve can be determined according to the user's gas usage frequency. For users or user units that are out of service for a long time, it can effectively save the operating energy consumption of the gas supply pipeline, reduce the overall operating risk of the pipeline network, and has certain safety and economic benefits.

[0043] Further Figure 2 As shown, a circulating compressor 7 is provided on the return air pipeline for compressing the hydrogen-blended fuel gas collected in the return air pipeline and then sending it back into the intake air pipeline. Figure 2 A first check valve 5 is provided at the gas source position in the air return pipe. A second check valve 6 and a third check valve 8 are provided upstream and downstream of the circulating compressor 7, respectively. By setting the circulating compressor on the return air pipeline, the loop gas only needs to be slightly pressurized to be injected back into the intake pipeline, so there is no waste of resources and the energy consumption of the pipeline network operation is low.

[0044] The hydrogen-blended fuel gas user dual-pipeline regulating system of the utility model has simple process, easy operation, and does not require the addition of complex equipment. It can be realized by simply modifying the existing fuel gas pipeline network.

[0045] The foregoing description of specific exemplary embodiments of the utility model is for the purpose of illustration and illustration. These descriptions are not intended to limit the utility model to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the utility model and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the utility model and various different options and changes. Any simple modifications, equivalent changes and modifications made to the above exemplary embodiments should fall within the scope of protection of the utility model.

Claims

1. A dual-pipeline regulation system for hydrogen-blended gas users, characterized in that: For use in one or more end-user units, including: An air intake pipeline, which provides a hydrogen-blended fuel gas source for each of the terminal user units, each of which is provided with a plurality of user terminals and controls the gas supply through an air intake valve and a user valve; The return air pipeline collects the return air when one or some of the user valves are closed, and each of the user terminals controls the return air through a bypass valve and a return air valve.

2. The dual-pipeline regulation system for hydrogen-blended gas users according to claim 1 is characterized in that: Under the air supply condition, the air inlet valve and the air return valve are both in the open state.

3. The dual-pipeline regulation system for hydrogen-blended gas users according to claim 2 is characterized in that: When the user terminal uses gas, the corresponding user valve is in an open state and the corresponding bypass valve is in a closed state; when the user terminal stops using gas, the corresponding user valve is in a closed state and the corresponding bypass valve is in an open state.

4. The dual-pipeline regulation system for hydrogen-blended gas users according to claim 3 is characterized in that: When the user terminal stops using gas for a first preset time, the opening of the bypass valve is gradually reduced until it is completely closed.

5. The dual-pipeline regulation system for hydrogen-blended gas users according to claim 4 is characterized in that: When the user terminal resumes gas use, if the opening of the corresponding bypass valve is less than 1 / 2 at this time, the bypass valve is opened. After a second preset time, the corresponding user valve is in a fully open state, and the bypass valve is in a closed state.

6. The dual-pipeline regulation system for hydrogen-blended gas users according to claim 2 is characterized in that: When all user valves and bypass valves in a terminal user unit are in the closed state, the air intake valve and air return valve corresponding to the terminal user unit are automatically closed according to the set time interval, and the user unit is converted to a stop gas supply condition.

7. The dual-pipeline regulation system for hydrogen-blended fuel gas users according to claim 6 is characterized in that: When any user terminal in the terminal user unit resumes gas use, the air intake valve, the air return valve and the corresponding bypass valve of the terminal user unit are opened in sequence. After a second preset time, the user valve of the user terminal is opened and the corresponding bypass valve is closed at the same time.

8. The dual-pipeline regulation system for hydrogen-blended gas users according to claim 1 is characterized in that: The system also includes a controller for automatically controlling the opening and closing of the intake valve, the user valve, the bypass valve, the return valve, and the opening degree of the bypass valve.

9. The dual-pipeline regulation system for hydrogen-blended gas users according to claim 1 is characterized in that: The return air pipeline is provided with a circulation compressor for compressing the hydrogen-blended fuel gas collected in the return air pipeline and then sending it back into the intake air pipeline.

10. The dual-pipeline regulation system for hydrogen-blended gas users according to claim 9, characterized in that: A first check valve is provided upstream of the air intake pipeline, and a second check valve and a third check valve are provided upstream and downstream of the circulating compressor, respectively.

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