Disturbance type gas mixing device and gas turbine power generation system
By designing a disturbed gas blending device, the structure of the diffusion section, blending section and shrinking section, combined with the diffusion cone and the flow-sharing blade, the problem of poor natural gas hydrogen-doping combustion blending effect in the gas turbine power generation industry is solved, and more efficient and economical gas blending is achieved, which is suitable for the transformation of built power plants.
Patent Information
- Application Number
- CN202420409334.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-01
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-03-01
AI Technical Summary
When the prior art is used to burn natural gas hydrogen in the gas turbine power generation industry, the blending effect is poor, and a large volume and high-power high-pressure blending tank is required, the investment cost is high, and the space requirements are strict, making it difficult to implement in the built gas turbine power plant.
A disturbing gas blending device is designed, including a diffusion section, a blending section and a shrinking section. Through structures such as the flow cone and the flow-sharing blade, uniform gas mixing is achieved, reducing the requirements for space and investment.
It improves the uniformity of gas blending, reduces the volume and power requirements of the equipment, reduces investment costs, and is suitable for the renovation of built gas turbine power plants.
Smart Images
Figure CN222616951U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of mixing devices, and in particular relates to a disturbance type gas mixing device and a gas turbine power generation system. Background Art
[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.
[0003] In the industrial production process, there is often a need to mix two different types of gases. For example, for the gas turbine power generation industry, the transformation of natural gas blended with hydrogen combustion not only meets the requirements of green and low-carbon, but also improves the operating flexibility of the power plant, which is of great significance.
[0004] However, according to the inventors' understanding, due to the different types, qualities and properties of the two gases, the blending effect is often poor, or the blending needs to have a larger volume, higher power, etc. Take natural gas blending with hydrogen as an example. At present, high-pressure tanks are often used for blending. The airflow velocity in the high-pressure blending tank is slow, which can improve the blending uniformity of the fuel, but its flow resistance is large, the investment cost is high, and the safety distance requirements are high. It is necessary to plan a certain space to arrange related equipment and pipelines. For the built gas turbine power plants, generally no land is reserved for the construction of hydrogen blending systems. Summary of the invention
[0005] In order to solve the above problems, the utility model proposes a disturbance type gas mixing device and a gas turbine power generation system, which have a simple structure and can improve mixing uniformity.
[0006] According to some embodiments, the utility model adopts the following technical solutions:
[0007] A disturbance type gas mixing device comprises a diffusion section, a mixing section and a contraction section which are arranged in sequence, wherein the sections are smoothly connected, the diameter of the diffusion section changes gradually from small to large, and the diameter of the contraction section changes gradually from large to small;
[0008] The front end of the diffusion section is provided with a first inlet for the entry of the first gas;
[0009] The outer circumference of the mixing section is provided with a plurality of second inlets for the entry of the second gas;
[0010] The end of the contraction section is provided with an outlet for outputting the mixed gas;
[0011] A guide cone is provided inside the gas mixing device, the front end of the guide cone is in a cone shape with a diameter from small to large, and the guide cone extends from the first inlet to the outlet;
[0012] The second inlet is connected to the outer wall of the guide cone through a pipeline, the pipeline and the guide cone are not connected, and each adjacent pipeline is connected through a plurality of pipelines, and the pipelines and the pipelines are both provided with a plurality of through holes;
[0013] A plurality of flow balancing blades are arranged on the outside of the guide cone, in the area inside the contraction section.
[0014] In the above scheme, the gas entering through the first inlet is guided to the mixing section through the guide cone, while the gas entering through the second inlet enters the mixing section through the through holes in the pipeline. The two gases are mixed in the mixing section, and because the gas at the first inlet changes direction and produces turbulent vortices after passing through the diffusion section, the gas at the second inlet can be mixed faster and more evenly. By setting the flow-equalizing blades, the mixing uniformity is further improved, ensuring that the mixed gas at the outlet has better uniformity, and also plays the role of deracemization and flow equalization.
[0015] As an optional embodiment, the diffuser section, the mixing section and the contraction section are coaxially connected.
[0016] As an optional implementation, the guide cone is arranged at the center.
[0017] As an optional implementation, a plurality of guide blades are evenly arranged on the circumference of the guide cone in the diffusion section.
[0018] As a further feature, the guide blades have a certain degree of twist, and flow channels are provided between the guide blades.
[0019] As a further feature, the arrangement direction of the guide blades forms a certain angle with the axis of the guide cone, and the arrangement angles of the guide blades are the same.
[0020] As an optional implementation, a plurality of annular pipes are provided between the adjacent pipelines, and the annular pipes are concentrically arranged.
[0021] As a further feature, the pipeline is connected to the conduit.
[0022] As an optional implementation, a through hole is provided on a surface of the pipeline and the conduit facing away from the diffuser section.
[0023] As a further feature, the through holes are evenly distributed.
[0024] As an optional implementation, in the contraction section, a plurality of radial flow balancing blades are evenly arranged between the guide cone and the inner wall of the contraction section, a plurality of circumferential flow balancing blades are arranged between each radial flow balancing blade, and the two types of flow balancing blades form a de-rotation guide blade group.
[0025] A gas turbine power generation system comprises a disturbance type gas mixing device, wherein the diffusion section of the mixing device is connected to a natural gas pipeline, the contraction section is connected to the natural gas pipeline, and the second inlet is used for mixing hydrogen.
[0026] Compared with the prior art, the beneficial effects of the utility model are:
[0027] The natural gas in the diffusion section of the utility model changes direction and generates turbulent vortices under the action of the swirling guide blades and then enters the mixing section, thereby facilitating the mixing of the two gases in the mixing section.
[0028] The utility model evenly opens holes on the entire cross section of the mixing pipeline of the second gas in the mixing section, so that the gas is evenly mixed in the entire cross section, which solves the problem of uneven mixing caused by different gas masses and different penetrations to a certain extent.
[0029] The through hole of the utility model is located on the leeward side of the air inlet pipe, and a Karman vortex street is formed when the first gas flows through the pipe, which is beneficial to the ejection of the gas and further improves the mixing uniformity of the two gases.
[0030] The de-rotation guide device in the contraction section of the utility model can de-rotate and equalize the turbulent mixed gas at the outlet of the mixing section, so that the mixed gas at the outlet of the contraction section can achieve the purpose of equal flow and uniform mixing.
[0031] When applying gas turbine power generation, it is only necessary to install a blending device on the natural gas pipeline. There is no need to set up pressure vessels such as high-pressure blending tanks, nor is there a need to add hydrogen mixing stations. This can reduce the floor space and project investment, and is more conducive to the transformation of existing gas turbine power plants to hydrogen blending combustion.
[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.
[0034] Figure 1 It is a schematic diagram of the structure of the disturbance type gas mixing device of the utility model;
[0035] Figure 2 yes Figure 1 AA perspective structure diagram;
[0036] Figure 3 yes Figure 1 Internal connection diagram of
[0037] Figure 4 yes Figure 3 BB perspective structure diagram;
[0038] Figure 5 yes Figure 3 CC perspective structure diagram;
[0039] Figure 6 yes Figure 3 DD perspective structure diagram.
[0040] Among them, 1. diffusion section, 2. mixing section, 3. contraction section, 4. first inlet, 5. second inlet, 6. guide cone, 7. rotation guide blade, 8. de-rotation guide blade, 9. flow channel, 10. through hole, 11. radial flow balancing blade, 12. circumferential flow balancing blade, I. not connected. DETAILED DESCRIPTION
[0041] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0042] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.
[0043] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0044] In the absence of conflict, the embodiments in this application and the features in the embodiments may be combined with each other.
[0045] Embodiment 1
[0046] This embodiment is described by taking the application in the field of power generation to mix hydrogen and natural gas as an example, but it does not mean that the device provided in this embodiment can only be used for mixing the above two gases.
[0047] In this embodiment, if Figure 1 As shown, a mixing device is arranged on the natural gas pipeline, and the mixing device consists of three parts: a diffusion section 1, a mixing section 2 and a contraction section 3.
[0048] The diffuser section 1 is connected to the natural gas pipeline, and the back is connected to the mixing section 2. The first inlet 4 at the front end of the diffuser section 1 is used to introduce natural gas. The diffuser section 1 is used to guide the natural gas, so that the natural gas changes direction and produces turbulent vortices in the diffuser section 1. The internal guide cone 6 is set at the center line of the pipeline, and the cone continues to the outlet of the contraction section 3. Figure 2 As shown, 12 twisted swirling guide vanes 7 are evenly arranged at equal angles between the internal guide cone 6 and the inner wall of the diffuser section 1. When the natural gas flows through the swirling guide vanes 7 in the diffuser section 1, a change in direction and turbulent vortices are generated.
[0049] The mixing section 2 is located after the diffusion section 1 and before the contraction section 3. The diameter of the mixing section 2 is larger than the original natural gas pipe diameter, so that when the guide cone 6 and the hydrogen mixing pipeline are arranged inside, a relatively low flow rate is maintained to avoid excessive natural gas pressure drop.
[0050] like Figure 3 , Figure 4 As shown, the mixing section 2 is provided with an internal guide cone 6 and a hydrogen mixing pipeline and other components. The hydrogen mixing pipeline and the external hydrogen gas pipeline have four second inlets 5, so as to achieve the purpose of uniform air intake. The hydrogen pipeline in the mixing section 2 has four radial straight pipes and two annular pipes. One end of each straight pipe is connected to the external hydrogen pipeline for hydrogen entry, and the other end is welded to the internal guide cone 6 to play a fixing role, but it is not connected to the internal space of the internal cone.
[0051] A through hole 10 is opened at the leeward side (i.e., the downstream side of the natural gas flow) of the straight pipe at an appropriate position to form a hydrogen nozzle for the entry of mixed hydrogen. Two annular pipes are evenly distributed between the internal guide cone 6 and the inner wall, welded with the four straight pipes, and connected internally. Through holes 10 are opened at equal angles at appropriate positions on the leeward side of the annular pipes, such as Figure 5 As shown, a hydrogen nozzle is formed for the entry of mixed hydrogen.
[0052] The natural gas changes direction and generates turbulent vortices in the diffusion section 1. When it flows into the hydrogen blending pipeline in the blending section 2, it further generates turbulence, creating a negative pressure area on the leeward side of the hydrogen pipeline. The high-pressure hydrogen just enters from these negative pressure positions on the leeward side of the hydrogen pipeline, and is quickly and evenly mixed into the natural gas under the strong entrainment and disturbance of the natural gas.
[0053] like Figure 6 As shown, the contraction section 3 is located behind the mixing section 2 and is connected to a natural gas pipeline. In the contraction section 3, 12 radial flow-averaging blades 11 are evenly arranged between the internal guide cone 6 and the inner wall of the contraction section 3. One end of each radial flow-averaging blade 11 is welded to the internal guide cone 6, and the other end is welded to the inner wall of the contraction section 3 to play a fixing role.
[0054] Three circles of circumferential equalizing blades 12 are evenly arranged between the inner guide cone 6 and the inner wall of the contraction section 3. The circumferential equalizing blades 12 are welded to the radial equalizing blades 11 to play a fixing role. The radial equalizing blades 11 and the axial equalizing blades form a group of de-rotation guide blades 8 to de-rotate and equalize the rotating turbulent natural gas and hydrogen mixed gas at the outlet of the mixing section 2, so that the mixed gas at the outlet of the contraction section 3 can achieve the purpose of equal flow and uniform mixing.
[0055] The number of each component in the above embodiment can be adjusted or changed in other embodiments according to the requirements of gas type, gas characteristics, gas mixing ratio, etc., which will not be described in detail here.
[0056] In this embodiment, the natural gas in the diffusion section 1 undergoes a change in direction and turbulent vortices under the action of the swirling guide vanes 7 and then enters the mixing section 2 , thereby facilitating the mixing of hydrogen and natural gas in the mixing section 2 .
[0057] The hydrogen blending pipeline has holes evenly opened on the entire cross section in the blending section 2, so that hydrogen can be evenly blended in the entire cross section, which to a certain extent solves the problem of uneven mixing caused by the light weight and poor penetration of hydrogen.
[0058] The hydrogen outlet is located on the leeward side of the hydrogen pipeline. When natural gas flows through the circular hydrogen pipeline, a Karman vortex street is formed, which is beneficial to the ejection of the hydrogen pipeline and further improves the uniformity of the mixing of hydrogen and natural gas.
[0059] The de-racemation guide device in the contraction section 3 can de-racemize and equalize the rotating turbulent natural gas and hydrogen mixed gas at the outlet of the blending section 2, so that the mixed gas at the outlet of the contraction section 3 can achieve the purpose of equal flow and uniform blending.
[0060] When this embodiment is applied, it is only necessary to install a blending device on the natural gas pipeline. There is no need to set up pressure vessels such as high-pressure blending tanks, nor is there any need to add hydrogen mixing stations. This can reduce the floor space and project investment, and is more conducive to the transformation of existing gas turbine power plants to hydrogen blending combustion.
[0061] The burner, flow components, and natural gas pipeline after blending of the gas turbine do not need to be modified to adapt to the working conditions of hydrogen blending.
[0062] Of course, the device provided in the above embodiment can also be used for mixing other different gases or mixing cold and hot air in power plants, etc., which are not listed here in full.
[0063] The above description is only the preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made by those skilled in the art within the spirit and principle of the utility model without creative labor shall be included in the protection scope of the utility model.
Claims
1. A disturbance type gas mixing device, characterized in that: It comprises a diffusion section, a mixing section and a contraction section which are arranged in sequence, and each section is smoothly connected. The diameter of the diffusion section changes gradually from small to large, and the diameter of the contraction section changes gradually from large to small. The front end of the diffusion section is provided with a first inlet for the entry of the first gas; The outer circumference of the mixing section is provided with a plurality of second inlets for the entry of the second gas; The end of the contraction section is provided with an outlet for outputting the mixed gas; A guide cone is provided inside the gas mixing device, the front end of the guide cone is in a cone shape with a diameter from small to large, and the guide cone extends from the first inlet to the outlet; The second inlet is connected to the outer wall of the guide cone through a pipeline, the pipeline and the guide cone are not connected, and each adjacent pipeline is connected through a plurality of pipelines, and the pipelines and the pipelines are both provided with a plurality of through holes; A plurality of flow balancing blades are arranged on the outside of the guide cone, in the area inside the contraction section.
2. A disturbance type gas mixing device as claimed in claim 1, characterized in that: The diffusion section, the mixing section and the contraction section are coaxially connected.
3. A disturbance type gas mixing device as claimed in claim 1, characterized in that: The guide cone is arranged at the center.
4. A disturbance type gas mixing device as claimed in claim 1, characterized in that: The guide cone is provided with a plurality of guide blades evenly arranged on the circumference of the diffusion section.
5. A disturbance type gas mixing device as claimed in claim 4, characterized in that: The guide blades have a certain degree of twist, and flow channels are arranged between the guide blades.
6. A disturbance type gas mixing device as claimed in claim 5, characterized in that: The arrangement direction of the guide blades forms a certain angle with the axis of the guide cone, and the setting angles of the guide blades are the same.
7. A disturbance type gas mixing device as claimed in claim 1, characterized in that: A plurality of annular pipes are arranged between the adjacent pipes, and the annular pipes are arranged concentrically; The annular pipe is communicated with the pipeline.
8. A disturbance type gas mixing device as claimed in claim 6, characterized in that: The pipeline and the conduit are provided with a through hole on one side facing away from the diffusion section; The through holes are evenly distributed.
9. A disturbance type gas mixing device as claimed in claim 1, characterized in that: In the contraction section, a plurality of radial flow balancing blades are evenly arranged between the guide cone and the inner wall of the contraction section, a plurality of circumferential flow balancing blades are arranged between each radial flow balancing blade, and the two types of flow balancing blades form a de-rotation guide blade group.
10. A gas turbine power generation system, characterized in that: It comprises the disturbance type gas blending device according to any one of claims 1 to 9, wherein the diffusion section of the blending device is connected to a natural gas pipeline, the contraction section is connected to a natural gas pipeline, and the second inlet is used for blending hydrogen.