Pipeline structure for preventing hydrogen in hydrogen-doped pipeline from being locally gathered
By designing a bent pipe structure in the hydrogen-doped pipeline to block the diffusion of hydrogen, the problem of uneven gas mixing caused by local aggregation of hydrogen is solved, and the uniform mixing of hydrogen and natural gas is achieved, ensuring the normal operation of gas-fueled gas equipment and having strong economicality.
Patent Information
- Application Number
- CN202421766385.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-07-25
AI Technical Summary
Hydrogen in existing hydrogen-doped pipelines tends to accumulate locally, resulting in uneven gas mixing and affecting the normal operation of gas-fueled gas equipment.
A pipeline structure is designed, including at least one section of bent pipe, whose ends are higher than the middle of the bent pipe, the intake end of the bent pipe is connected to the first gas pipeline, the exhaust end is connected to the second gas pipeline, and the second gas pipeline is higher than the first gas pipeline to block the diffusion of hydrogen.
Effectively prevent hydrogen from gathering locally in the pipeline, ensure uniform mixing of hydrogen and natural gas, avoid combustion failures, and have less investment in transformation and strong economicality.
Smart Images
Figure CN222880679U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hydrogen-doped pipelines, in particular to a pipeline structure for preventing local accumulation of hydrogen in a hydrogen-doped pipeline. Background Art
[0002] At present, the gas consumption structure has transitioned to a form where natural gas is the dominant gas source, and the corresponding gas transmission pipelines are also built in accordance with the technical requirements of natural gas. Hydrogen energy, as a clean secondary energy source, is conducive to reducing the emission of greenhouse gases and other pollutants, and will definitely occupy an important position in the future energy system. The use of existing natural gas pipeline facilities to blend hydrogen for transportation can greatly reduce the investment cost of hydrogen transportation.
[0003] Due to the differences in physical properties and combustion characteristics between hydrogen and natural gas, the amount of hydrogen in the natural gas pipeline should be maintained at a specific ratio, while the amount of gas usually has obvious peak and valley characteristics. When the gas consumption is low, the natural gas flow rate in the pipeline network is slow or even the gas in the local pipeline is static. At this time, hydrogen and natural gas are very likely to be stratified. If there is a large height difference between the pipelines, hydrogen will gather in the high pipeline, resulting in uneven gas mixing. Gas terminal equipment is basically based on combustion utilization, and has high requirements for gas quality. Uneven gas mixing will cause combustion failures in most gas equipment. Therefore, it is necessary to carry out technical transformation of the existing urban gas pipeline network, while taking into account the economic feasibility of the transformation to avoid large-scale demolition and construction and waste of investment. Utility Model Content
[0004] In order to overcome the technical defect of the existing hydrogen blending pipeline that hydrogen is easy to locally gather and cause uneven gas mixing, the utility model provides a pipeline structure for preventing the local gathering of hydrogen in the hydrogen blending pipeline.
[0005] The utility model provides a pipeline structure for preventing local accumulation of hydrogen in a hydrogen blending pipeline, comprising at least one section of bent pipe, both ends of the bent pipe being higher than the middle of the bent pipe, and the air inlet end of the bent pipe being connected to a first gas pipeline, and the exhaust end of the bent pipe being connected to a second gas pipeline, and the second gas pipeline being higher than the first gas pipeline.
[0006] Optionally, the bent pipe is U-shaped or arc-shaped.
[0007] Optionally, the first gas pipeline is a horizontal pipeline, and the second gas pipeline is a vertical pipeline.
[0008] Optionally, the first gas pipeline and the second gas pipeline are collinear and arranged obliquely.
[0009] Optionally, the first gas pipeline or the second gas pipeline is provided with a hydrogen-natural gas mixing device.
[0010] Compared with the prior art, the technical solution provided by the utility model has the following advantages:
[0011] The utility model provides a pipeline structure for preventing local accumulation of hydrogen in a hydrogen blending pipeline, which is provided with an elbow, the two ends of which are higher than the middle of the elbow. When hydrogen blending is transported, natural gas will occupy the relatively low middle position of the elbow due to its high density, so that the hydrogen in the first gas pipeline and the second gas pipeline is blocked by the natural gas in the elbow, and the hydrogen cannot diffuse from the first gas pipeline to the second gas pipeline, thereby avoiding local accumulation of hydrogen, and then ensuring uniform mixing of hydrogen and natural gas when the gas resumes rapid flow. In addition, the pipeline structure makes full use of existing natural gas pipeline network facilities, with less investment in transformation and strong economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.
[0013] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0014] Figure 1 Schematic diagram showing the application of the pipeline structure in the embodiment of the utility model Figure 1 ;
[0015] Figure 2 Schematic diagram showing the application of the pipeline structure in the embodiment of the utility model Figure 2 .
[0016] In the figure:
[0017] 1. Bend pipe; 2. First gas pipeline; 3. Second gas pipeline; 4. Hydrogen and natural gas mixing device. DETAILED DESCRIPTION
[0018] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the scheme of the utility model will be further described below. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.
[0019] In the description, it should be noted that the terms "first" and "second" are only used for descriptive purposes and should not be understood as indicating or implying relative importance. It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.
[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.
[0021] The specific embodiments of the present utility model are described in detail below with reference to the accompanying drawings.
[0022] Reference Figure 1 and Figure 2 The present embodiment provides a pipeline structure for preventing local accumulation of hydrogen in a hydrogen blending pipeline, comprising at least one section of an elbow 1, both ends of the elbow 1 being higher than the middle of the elbow 1, and the air inlet end of the elbow 1 being connected to a first gas pipeline 2, and the exhaust end of the elbow 1 being connected to a second gas pipeline 3, and the second gas pipeline 3 being higher than the first gas pipeline 2.
[0023] It is easy to understand that at least one section of the elbow 1 is one section or two sections or more. When the elbow 1 is provided with multiple sections, it should be installed in sections at a certain distance, so that the hydrogen can be divided in the pipeline between adjacent elbows 1 to avoid hydrogen accumulation in the entire pipeline due to the height difference of the pipeline. This structure is suitable for the scenario where the second gas pipeline 3 is higher than the second gas pipeline 3. In specific implementation, the number of elbows 1 can be determined according to the scenario requirements.
[0024] Specifically, the curved pipe 1 is U-shaped or arc-shaped. The arc-shaped includes a semicircular shape and a major arc shape or a minor arc shape. Of course, the curved pipe 1 can also be a curved pipe 1 that is convex downward.
[0025] Specifically, Figure 1 As shown, the first gas pipeline 2 is a horizontal pipeline, and the second gas pipeline 3 is a vertical pipeline. At the intersection of the horizontal pipeline and the vertical pipeline, when the hydrogen-blended natural gas flows slowly or is stationary, the hydrogen with a lower density tends to diffuse into the vertical pipeline and gather in the vertical pipeline. This structure can block the hydrogen in the horizontal pipeline and the vertical pipeline by arranging an elbow 1 at the intersection of the horizontal pipeline and the vertical pipeline, thereby preventing the hydrogen from gathering in the vertical pipeline.
[0026] Specifically, Figure 2 As shown, the first gas pipeline 2 and the second gas pipeline 3 are arranged in a colinear manner and tilted, that is, the gas pipeline has a certain slope. When the hydrogen-blended natural gas flows slowly or is stationary, the hydrogen with a lower density tends to diffuse into the relatively high second gas pipeline 3 and gather in the second gas pipeline 3. This structure can block the hydrogen in the two gas pipelines by setting the elbow 1, thereby preventing the hydrogen from gathering in the relatively high second gas pipeline 3.
[0027] Furthermore, the first gas pipeline 2 or the second gas pipeline 3 is provided with a hydrogen-natural gas mixing device 4. The hydrogen-natural gas mixing device 4 is used to achieve mixing of hydrogen and natural gas, and in particular to remix the stratified gas evenly when the gas resumes its flow rate. The hydrogen-natural gas mixing device 4 is a mature structure in the art and will not be described in detail here.
[0028] The working principle of the pipeline structure of this embodiment for preventing local accumulation of hydrogen in the hydrogen blending pipeline is as follows:
[0029] When the hydrogen-blended natural gas flows slowly or is stationary, stratification occurs in the gas pipeline. Due to the presence of the elbow 1, the natural gas with a higher density will be filled in the relatively low middle position of the elbow 1, so that the hydrogen in the upper layer of the first gas pipeline 2 cannot continue to diffuse into the second gas pipeline 3. If the elbows 1 are installed in sections at a certain distance on the gas pipeline, the hydrogen can be divided in the gas pipeline between adjacent elbows 1 to prevent hydrogen from gathering in the entire pipeline due to the height difference of the pipeline. When the gas in the gas pipeline resumes rapid flow, the hydrogen and natural gas mixing device can remix the stratified gas evenly.
[0030] The above is only a specific implementation of the utility model, so that those skilled in the art can understand or implement the utility model. Although detailed descriptions are given with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.
Claims
1. A pipeline structure for preventing local accumulation of hydrogen in a hydrogen blending pipeline, characterized in that: The invention comprises at least one section of curved pipe (1), wherein both ends of the curved pipe (1) are higher than the middle of the curved pipe (1), and the air inlet end of the curved pipe (1) is connected to a first gas pipeline (2), and the air outlet end of the curved pipe (1) is connected to a second gas pipeline (3), and the second gas pipeline (3) is higher than the first gas pipeline (2).
2. The pipeline structure for preventing local accumulation of hydrogen in a hydrogen blending pipeline according to claim 1, characterized in that: The curved pipe (1) is U-shaped or arc-shaped.
3. The pipeline structure for preventing local accumulation of hydrogen in a hydrogen blending pipeline according to claim 1, characterized in that: The first gas pipeline (2) is a horizontal pipeline, and the second gas pipeline (3) is a vertical pipeline.
4. The pipeline structure for preventing local accumulation of hydrogen in a hydrogen blending pipeline according to claim 1, characterized in that: The first gas pipeline (2) and the second gas pipeline (3) are collinear and arranged obliquely.
5. The pipeline structure for preventing local accumulation of hydrogen in a hydrogen blending pipeline according to any one of claims 1 to 4, characterized in that: The first gas pipeline (2) or the second gas pipeline (3) is provided with a hydrogen-natural gas mixing device (4).