Hydrogen and natural gas mixing structure and gas turbine power generation system with same

Abstract

The present application relates to the technical field of fuel supply system of combustion engine power plant, in particular to a hydrogen and natural gas mixing structure and a gas turbine power generation system with the same. The hydrogen and natural gas mixing structure is used for supplying mixed gas of natural gas and hydrogen to the gas turbine power generation system, and comprises a natural gas pipe body and a hydrogen pipe body. One end of the hydrogen pipe body extends into the inner cavity of the natural gas pipe body. The end of the hydrogen pipe body extending into the inner cavity of the natural gas pipe body is closed. A plurality of injection holes are arranged on the part of the hydrogen pipe body extending into the inner cavity of the natural gas pipe body. The hydrogen and natural gas mixing structure provided by the present application can supply mixed gas of natural gas and hydrogen to the gas turbine power generation system. The mixed gas is uniform, the heat value fluctuation of the mixed fuel is reduced, the combustion stability of the gas turbine can be effectively ensured, and the operation stability of the gas turbine when burning the mixed gas of natural gas and hydrogen is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fuel supply system of combustion engine power plant, in particular to a hydrogen and natural gas mixing structure and a gas turbine power generation system with the same. BACKGROUND

[0002] Renewable energy has become a new hotspot of energy utilization due to its advantages of clean and environmental protection, recyclability and the like. However, renewable energy such as solar energy, wind energy and hydroelectricity has intermittency and instability, and when resources are abundant and terminal consumption is in a trough, they cannot be consumed and have to be abandoned. In view of the characteristics of hydrogen such as light weight, good thermal conductivity, ideal calorific value, good combustion performance and zero carbon emission, the excess power can be converted into hydrogen as fuel by electrolysis of water for storage and use, which not only improves the cleanliness of energy, but also guarantees the stability of energy utilization, and solves the problem of consumption of renewable energy.

[0003] As a key equipment for large-scale gaseous fuel power generation, the heavy-duty gas turbine will have great development space if hydrogen fuel is mixed and burned on the existing natural gas fuel gas turbine. However, the heavy-duty gas turbine will emit a large amount of carbon dioxide during operation, and if the natural gas mixed fuel mixed with a certain volume ratio of hydrogen is mixed and burned on the existing gas turbine, the carbon dioxide emission of the heavy-duty gas turbine can be greatly reduced, and the operating power of the heavy-duty gas turbine will not be affected. However, the combustion performance of natural gas and hydrogen fuel is different, and since the density of natural gas and hydrogen is quite different, it is not easy to mix uniformly, which will cause the calorific value of hydrogen-mixed mixed fuel to fluctuate, which will affect the combustion stability of the gas turbine, and when the combustion is unstable, the unit will trip, and in severe cases, the combustion chamber, turbine and other hot channel components of the gas turbine will be damaged.

[0004] HA202209165 SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is to overcome the defect that when natural gas and hydrogen are directly mixed in the gas supply pipeline of the heavy-duty gas turbine power generation system, the hydrogen-mixed mixed fuel is not mixed uniformly, the calorific value of the fuel fluctuates, and the combustion stability of the gas turbine is affected, which causes the unit to trip, so as to provide a hydrogen and natural gas mixing structure and a gas turbine power generation system with the same.

[0006] In order to solve the above technical problems, the present application provides a hydrogen and natural gas mixing structure for supplying mixed gas of natural gas and hydrogen to a gas turbine power generation system, comprising:

[0007] a natural gas pipe body;

[0008] The hydrogen pipe body extends into the inner cavity of the natural gas pipe body, one end of the hydrogen pipe body is closed, and a plurality of injection holes are arranged on the part of the hydrogen pipe body extending into the inner cavity of the natural gas pipe body.

[0009] Optionally, the plurality of injection holes are arranged along the axial direction of the hydrogen pipe body.

[0010] Optionally, a spoiler is arranged on one side of the plurality of injection holes, and the spoiler extends along the axial direction of the hydrogen pipe body.

[0011] Optionally, the plurality of injection holes arranged along the axial direction of the hydrogen pipe body are symmetrically arranged on both sides of the hydrogen pipe body.

[0012] Optionally, the natural gas pipe body is provided with a first connecting piece at both ends, and the first connecting piece is used for connecting with an existing natural gas pipeline.

[0013] Optionally, the hydrogen pipe body is provided with a second connecting piece at one end outside the natural gas pipe body, and the second connecting piece is used for connecting with a hydrogen pipeline.

[0014] Optionally, the axis of the hydrogen pipe body intersects with the axis of the natural gas pipe body.

[0015] Optionally, the axis of the hydrogen pipe body is perpendicular to the axis of the natural gas pipe body.

[0016] Optionally, a filter is arranged in the hydrogen pipe body.

[0017] The application also provides a gas turbine power generation system with the hydrogen and natural gas mixing structure.

[0018] The technical scheme of the application has the following advantages:

[0019] 1. The hydrogen and natural gas mixing structure is used for supplying mixed gas of natural gas and hydrogen to a gas turbine power generation system, and comprises a natural gas pipe body and a hydrogen pipe body.

[0020] The hydrogen and natural gas mixing structure can be based on the existing natural gas fuel supply pipeline, or can be arranged in a new factory as a separate natural gas supply pipeline. When the hydrogen and natural gas mixing structure provided by the application is used to supply gas to a gas turbine power generation system, hydrogen is transported through the hydrogen pipe body and finally injected into the natural gas pipe body from the injection hole to mix with the natural gas. The natural gas enters from one side of the natural gas pipe body and flows through the hydrogen pipe body inserted into the natural gas pipe body. Due to the reduced flow area of the natural gas pipe body, the flow rate of the natural gas gradually increases, the static pressure of the natural gas at the injection hole decreases, and the hydrogen will automatically be injected from the hydrogen pipe. This can effectively solve the problem that hydrogen fuel cannot be well mixed with natural gas due to its light weight and poor penetration. After the natural gas and hydrogen are preliminarily mixed, the flow area gradually increases under the action of the hydrogen pipe body, and a large number of turbulent vortices are formed on one side of the hydrogen pipe body, forming a turbulent vortex mixing zone. Under the action of the turbulent vortex, the further mixing of natural gas and hydrogen is accelerated. The mixed gas after mixing flows out downstream of the natural gas pipe body and is used by the downstream gas turbine power generation equipment. The mixed gas of natural gas and hydrogen supplied by the hydrogen and natural gas mixing structure provided by the application to the gas turbine power generation system is uniformly mixed, reduces the heat value fluctuation of the mixed fuel, effectively ensures the combustion stability of the downstream gas turbine, and improves the operation stability of the gas turbine when burning the mixed gas of natural gas and hydrogen.

[0021] 2. The hydrogen and natural gas mixing structure provided by the application, a plurality of injection holes are arranged along the axial direction of the hydrogen pipe body, and hydrogen is injected into the natural gas pipe body from the injection holes at different levels in the same column to mix with the natural gas. The attractive force experienced by the hydrogen in different injection holes is approximately equal, so that the mixing degree of hydrogen and natural gas injected from different injection holes is the same, which can improve the uniformity of hydrogen and natural gas mixing.

[0022] 3. The hydrogen and natural gas mixing structure provided by the application, a plurality of injection holes are arranged along the axial direction of the hydrogen pipe body, and hydrogen is injected into the natural gas pipe body from the injection holes at different levels in the same column to mix with the natural gas. The attractive force experienced by the hydrogen in different injection holes is approximately equal, so that the mixing degree of hydrogen and natural gas injected from different injection holes is the same, which can improve the uniformity of hydrogen and natural gas mixing.

[0023] 4. The hydrogen and natural gas mixing structure provided by the application, the natural gas pipe body is provided with a first connecting piece at both ends, and the first connecting piece is used to connect with the existing natural gas pipeline. By arranging the first connecting piece, the natural gas pipe body can be connected with the existing natural gas pipeline. When installing, after cutting the existing natural gas pipeline with the same length as the natural gas pipe body, the natural gas pipe body can be installed on the existing pipeline by using the first connecting piece, which is convenient for improving and upgrading the existing pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a front view of a hydrogen and natural gas blending structure provided in an embodiment of the present invention.

[0026] Figure 2 for Figure 1 The diagram shows a cross-sectional view along the A-A direction of the hydrogen and natural gas blend structure.

[0027] Explanation of reference numerals in the attached drawings: 1. Hydrogen pipe body; 2. Natural gas pipe body; 3. Injection hole; 4. Baffle; 5. Turbulent vortex mixing zone; 6. Filter; 7. First connector; 8. Second connector. Detailed Implementation

[0028] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] Example 1

[0033] like Figure 1 and Figure 2 The diagram shows a hydrogen-natural gas blending structure provided in this embodiment, used to supply a gas turbine power generation system with a mixture of natural gas and hydrogen, including a natural gas pipe body 2 and a hydrogen pipe body 1. Figure 1 The horizontal arrow indicates the direction of natural gas flow, and the vertical arrow indicates the direction of hydrogen flow.

[0034] One end of the hydrogen pipe body 1 extends into the inner cavity of the natural gas pipe body 2. The end of the hydrogen pipe body 1 extending into the inner cavity of the natural gas pipe body 2 is closed. Multiple injection holes 3 are spaced apart on the part of the hydrogen pipe body 1 extending into the inner cavity of the natural gas pipe body 2.

[0035] Multiple injection holes 3 are arranged at intervals along the axial direction of the hydrogen pipe body 1. A dune-shaped flow deflector 4 is installed on one side of each injection hole 3, extending along the axial direction of the hydrogen pipe body 1. In actual operation, the flow deflector 4 is located upstream of the natural gas pipe body 2. Two sets of injection holes 3, arranged at intervals along the axial direction of the hydrogen pipe body 1, are symmetrically arranged on both sides of the hydrogen pipe body 1.

[0036] Both ends of the natural gas pipeline body 2 are equipped with connecting flanges serving as first connecting parts 7, which are used to connect to existing natural gas pipelines. Upstream and downstream markings are required on the connecting flanges at both ends of the natural gas pipeline body to determine the upstream and downstream direction of the installation, so that the spoiler 4 is positioned upstream of the injection port 3. The hydrogen pipeline body 1, located outside the natural gas pipeline body 2, is equipped with a connecting flange serving as a second connecting part 8, which is used to connect and connect with a hydrogen pipeline.

[0037] To improve the uniformity of hydrogen and natural gas mixing, in this embodiment, the hydrogen pipe body 1 and the natural gas pipe body 2 are arranged perpendicularly, with the axis of the hydrogen pipe body 1 intersecting the axis of the natural gas pipe body 2. The axes of the hydrogen pipe body 1 and the natural gas pipe body 2 are perpendicular to each other. To ensure the cleanliness of the hydrogen, a mesh filter 6 is installed inside the hydrogen pipe body 1.

[0038] The hydrogen pipe body 1 is vertically inserted into the natural gas pipe body 2, and the connection is welded and sealed. The connecting flange on the hydrogen pipe body 1 connects to the existing hydrogen fuel pipe. The two connecting flanges on the natural gas pipe body 2 connect to the inlet and outlet ends of the existing natural gas pipeline. A hydrogen filter 6 is installed inside the hydrogen pipe body 1, upstream of the injection hole 3. The injection hole 3 is located on the hydrogen pipe body 1 inserted into the natural gas pipe body 2. The direction of the injection hole 3 is perpendicular to the axial direction of the natural gas pipe body 2. A dune-shaped spoiler 4 is installed to the right of the injection hole 3, i.e., upstream of the natural gas pipe body 2. A turbulent vortex mixing zone 5 is located to the left of the hydrogen pipe body 1 inserted into the natural gas pipe body 2. This embodiment is based on the existing natural gas fuel pipeline of the power plant. A natural gas pipeline of the same length as the natural gas pipe body 2 in this embodiment is cut, and the two connecting flanges upstream and downstream of the natural gas pipe body 2 are used to connect it to the existing natural gas pipeline of the power plant. The connecting flange on the hydrogen pipe body 1 is used to connect it to the hydrogen fuel supply pipe. Hydrogen enters from the top of the hydrogen pipe body 1, then flows through the hydrogen filter 6. After being filtered by the hydrogen filter 6, it is ejected from the injection holes 3 at different horizontal heights into the natural gas pipe body 2, where it is mixed with natural gas. Natural gas enters from the right side of the natural gas pipe body 2. As it flows through the hydrogen pipe body 1 inserted inside the natural gas pipe body 2, the flow area decreases, the natural gas velocity gradually increases, and the static pressure decreases. After encountering the sand dune-shaped turbulent vortex 4, the natural gas generates turbulent vortices, further reducing the static pressure at the hydrogen injection hole 3. This facilitates the injection of hydrogen fuel and solves the problem that hydrogen fuel, due to its light weight and poor penetration, cannot be well mixed with natural gas. After the initial mixing of natural gas and hydrogen, the flow area gradually increases under the action of the hydrogen pipe body 1. The initially mixed gas of natural gas and hydrogen forms a large number of turbulent vortices on the left side of the hydrogen pipe body 1, forming a turbulent vortex mixing zone 5. Under the action of the turbulent vortex, the further mixing of natural gas and hydrogen is accelerated. The mixed gas flows out downstream of the natural gas pipe body 2 and is used by the downstream gas turbine power generation equipment.

[0039] Injection holes 3 are opened at different heights on the hydrogen pipe body 1, allowing hydrogen to be well distributed at different horizontal heights on the natural gas pipe body 2, thus improving the mixing effect of hydrogen and natural gas. Furthermore, this invention employs a structure where the hydrogen pipe body 1 is inserted into the natural gas pipe body 2. Under the induction effect of the hydrogen pipeline, the natural gas will form a turbulent vortex downstream of the hydrogen pipeline. This turbulent vortex will further accelerate the mixing of hydrogen and natural gas, making the hydrogen mixing more uniform. This solves the problem of uneven mixing in simple three-way mixing structures, where a large amount of hydrogen entering the natural gas pipeline can only mix with the natural gas at the periphery, resulting in low hydrogen content in the center of the natural gas pipeline and high hydrogen content at the periphery. The hydrogen-natural gas mixing structure provided in this embodiment can be based on existing natural gas pipelines in gas turbine power plants. After simple modification, it can achieve the mixing of hydrogen fuel with natural gas fuel, providing a stable blended fuel for the gas turbine. Compared with the design and construction of hydrogen blending stations, it has the advantage of low cost. At the same time, it does not require pressure vessels such as hydrogen blending tanks in hydrogen blending stations, and has lower requirements for safety distance. It can solve the problem that existing gas turbine power plants cannot build hydrogen blending stations due to land restrictions, thus preventing the realization of hydrogen blending combustion in gas turbines. It helps to promote the widespread application of hydrogen fuel in gas turbine power plants and improves the convenience of blending hydrogen fuel in gas turbine power plants.

[0040] As an alternative implementation, in order to facilitate the direct installation of the hydrogen pipe body and the natural gas pipe body on various existing types of natural gas pipelines, the angle between the axis of the hydrogen pipe body and the axis of the natural gas pipe body is an acute angle, so that the hydrogen pipe body and the natural gas pipe body are inclined together.

[0041] Example 2

[0042] This embodiment also provides a gas turbine power generation system having the hydrogen-natural gas blending structure described in Embodiment 1. By installing the hydrogen-natural gas blending structure described in Embodiment 1, a blended fuel of natural gas and hydrogen is provided to the gas turbine power generation system. The gas is transported through the hydrogen pipeline body and finally injected from the injection port into the natural gas pipeline body to blend with the natural gas. Natural gas enters from one side of the natural gas pipeline. As it flows through the hydrogen pipeline inserted inside, the flow area within the natural gas pipeline decreases, causing the natural gas velocity to gradually increase. This reduces the static pressure of the natural gas at the injection port, allowing hydrogen to be automatically injected from the hydrogen pipeline. This effectively solves the problem of hydrogen fuel's poor mixing with natural gas due to its light weight and poor penetration. After initial mixing, the flow area gradually increases under the influence of the hydrogen pipeline. The initially mixed gas forms numerous turbulent vortices on one side of the hydrogen pipeline, creating a turbulent vortex mixing zone. This turbulent vortex accelerates further mixing of the natural gas and hydrogen. The resulting mixture flows downstream of the natural gas pipeline and is supplied to downstream gas turbine power generation equipment. The hydrogen-natural gas mixing structure provided by this invention provides a uniformly mixed gas-hydrogen mixture for the gas turbine power generation system. This minimizes fluctuations in the calorific value of the mixed fuel, effectively ensuring the combustion stability of the gas turbine and improving its operational stability when the gas turbine is supplied with the mixed gas-hydrogen mixture.

[0043] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A hydrogen-natural gas blending structure, characterized in that, The mixed gas mixture used to supply natural gas and hydrogen to gas turbine power generation systems includes: Natural gas pipeline body (2); The hydrogen pipe body (1) extends into the inner cavity of the natural gas pipe body (2) at one end. The end of the hydrogen pipe body (1) extending into the inner cavity of the natural gas pipe body (2) is closed. Multiple injection holes (3) are provided at intervals on the part of the hydrogen pipe body (1) extending into the inner cavity of the natural gas pipe body (2). Multiple injection holes (3) are arranged at intervals along the axial direction of the hydrogen pipe body (1). A flow deflector (4) is installed on one side of the multiple injection holes (3). The flow deflector (4) extends along the axial direction of the hydrogen pipe body (1) and is located upstream of the injection holes (3) along the flow direction of the fluid in the natural gas pipe body (2). The axis of the hydrogen pipe body (1) is perpendicular to the natural gas pipe body (2).

2. The hydrogen and natural gas blending structure according to claim 1, characterized in that, The plurality of injection holes (3) arranged at intervals along the axial direction of the hydrogen pipe body (1) are symmetrically arranged in two sets on both sides of the hydrogen pipe body (1).

3. The hydrogen and natural gas blending structure according to claim 1 or 2, characterized in that, The natural gas pipe body (2) is provided with a first connector (7) at both ends, which is used to connect with the existing natural gas pipeline.

4. The hydrogen and natural gas blending structure according to claim 3, characterized in that, The hydrogen pipe body (1) is provided with a second connector (8) at one end outside the natural gas pipe body (2), and the second connector (8) is used to connect with the hydrogen pipe.

5. The hydrogen and natural gas blending structure according to claim 1 or 2, characterized in that, A filter (6) is installed inside the hydrogen pipe body (1).

6. A gas turbine power generation system, characterized in that, It has the hydrogen and natural gas blending structure as described in any one of claims 1 to 5.

Images