A mixing valve for hydrogen-blended combustion engine burners

Abstract

The present invention discloses a mixed flow valve supporting a hydrogen-blended gas engine burner, comprising a first-stage valve body and a second-stage valve body, wherein the first-stage valve body and the second-stage valve body are detachably connected, a mixed flow turbine is arranged in the second-stage valve body, and the mixed flow turbine comprises a mixed flow turbine head, a connecting shaft and a turbine bearing, turbine blades and a turbine head fixing fastener are arranged on the mixed flow turbine head, the turbine blades are sleeved on the connecting shaft, one end of the connecting shaft is fixedly connected to the mixed flow turbine head through the turbine head fixing fastener, and the other end of the connecting shaft is rotatably connected to the turbine bearing, thereby ensuring the uniformity of the hydrogen-blended fuel gas entering the combustion chamber of the gas engine, making the combustion flame position and the high-temperature area in the combustion chamber more stable, and effectively reducing the probability of backfire.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrogen blending, and in particular relates to a mixing valve matched with a hydrogen blending gas engine burner. Background Art

[0002] As a green energy carrier, hydrogen can be coupled with renewable energy sources such as wind, solar, and biomass, making it a crucial component of my country's future energy system. For the gas turbine power generation industry, blending natural gas with hydrogen is a key development and application direction. Hydrogen has a smaller molecular weight than natural gas and diffuses more rapidly under the same operating conditions. Mixing hydrogen and natural gas can lead to stratification and uneven mixing. This uneven mixing of hydrogen-blended fuel gas can lead to unstable flame position and high-temperature zones within the combustion chamber of the gas turbine.

[0003] Currently, research on the uniformity of hydrogen and natural gas mixing is mostly focused on upstream stations, during the initial mixing stage of the two gases, while ignoring the stratification problem that occurs during the transportation of hydrogen-blended fuel gas downstream, especially the uniformity of hydrogen-blended natural gas at the burner inlet. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a mixing valve for a hydrogen-blended gas engine burner.

[0005] The specific plan is as follows:

[0006] A mixed flow valve for a hydrogen-blended gas engine burner includes a first-stage valve body and a second-stage valve body, wherein the first-stage valve body and the second-stage valve body are detachably connected, a mixed flow turbine is arranged in the second-stage valve body, and the mixed flow turbine includes a mixed flow turbine head, a connecting shaft and a turbine bearing, turbine blades and a turbine head fixing fastener are arranged on the mixed flow turbine head, the turbine blades are sleeved on the connecting shaft, one end of the connecting shaft is fixedly connected to the mixed flow turbine head via the turbine head fixing fastener, and the other end of the connecting shaft is rotatably connected to the turbine bearing.

[0007] The turbine blades are spiral-shaped, and the spiral angle is 30-45 degrees.

[0008] The mixing valve further includes a flange, which includes an upstream flange and a downstream flange. The upstream flange is fixedly connected to the first valve body, and the downstream flange is fixedly connected to the second valve body.

[0009] The first stage valve body and the second stage valve body are detachably connected by bolts.

[0010] The two-stage valve body is also provided with a grease injection port, which includes an upper grease injection port and a lower grease injection port. The upper grease injection port and the lower grease injection port are symmetrically fixed at the upper and lower ends of the two-stage valve body.

[0011] The upper grease injection port and the lower grease injection port are both provided with threaded plugs, the threaded plugs are detachably connected to the upper grease injection port, and the threaded plugs are also detachably connected to the lower grease injection port.

[0012] The mixing valve also includes an electric die head. A flow meter is provided on the upstream pipeline connected to the mixing valve. The electric die head is fixed on the second-stage valve body. The electric die head and the upstream pipeline flow meter are both electrically connected to the DCS.

[0013] The present invention discloses a mixing valve for a hydrogen-blended gas turbine burner. The mixing valve is installed on an inlet hydrogen-blended fuel gas pipeline near the combustion chamber of the gas turbine, and can solve the problem of uneven re-stratification and mixing of the hydrogen-blended fuel gas during transportation. Compared with the natural gas hydrogen-blending equipment at the upstream gate station, the mixing valve disclosed in the invention has a simple structure, is easy to install and maintain, and has a wide range of applications. It can be used on any pipeline for hydrogen-blended fuel gas transportation, and is particularly suitable for the hydrogen-blended fuel gas pipeline in front of the gas turbine burner, to ensure the uniformity of the hydrogen-blended fuel gas entering the combustion chamber of the gas turbine, make the combustion flame position and high-temperature area in the combustion chamber more stable, and effectively reduce the probability of backfire. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 It is a structural diagram of a mixed flow turbine. DETAILED DESCRIPTION

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the implementation of the present invention, not the entire implementation. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0017] The invention discloses a mixing valve matched with a hydrogen-blended gas engine burner. The mixing valve comprises a valve body including connecting flanges at both ends, a two-section valve body and a built-in mixed flow turbine electric die head.

[0018] like Figures 1 to 2As shown, a mixed flow valve for a hydrogen blending machine burner includes a first-stage valve body 2 and a second-stage valve body 5. The first-stage valve body 2 and the second-stage valve body 5 are detachably connected. A mixed flow turbine 7 is provided in the second-stage valve body 5. The mixed flow turbine 7 includes a mixed flow turbine head 71, a connecting shaft 73 and a turbine bearing 74. The mixed flow turbine head 71 is provided with turbine blades 72 and a turbine head fixing fastener 75. The turbine blades 72 are sleeved on the connecting shaft 73. One end of the connecting shaft 73 is fixedly connected to the mixed flow turbine head 71 through the turbine head fixing fastener 75, and the other end of the connecting shaft 73 is rotatably connected to the turbine bearing 74.

[0019] The mixed flow turbine head 71 is connected to the turbine bearing 74 via a connecting shaft 73 . The connecting shaft 73 supports the mixed flow head 71 . The other end of the connecting shaft 73 is inserted into the turbine bearing 74 , and the whole is supported by the valve seat.

[0020] The turbine blades 72 are spiral-shaped, and the spiral angle is 30-45 degrees.

[0021] The mixing valve also includes a flange 1, which includes an upstream flange 11 and a downstream flange 12. The upstream flange 11 is fixedly connected to the first valve body 2, and the downstream flange 12 is fixedly connected to the second valve body 5.

[0022] The first-stage valve body 2 and the second-stage valve body 5 are detachably connected via bolts 3 .

[0023] The second-stage valve body 5 is further provided with a grease injection port 6 , which includes an upper grease injection port 61 and a lower grease injection port 62 . The upper grease injection port 61 and the lower grease injection port 62 are symmetrically fixed at the upper and lower ends of the second-stage valve body 5 .

[0024] The upper grease injection port 61 is opened on the upper surface of the second-stage valve body 5 of the mixing valve and corresponds to the position of the turbine bearing 74. The lower grease injection port 62 is opened on the lower surface of the second-stage valve body 5 of the mixing valve and corresponds to the position of the turbine bearing 74. The sizes of the upper grease injection port 61 and the lower grease injection port 62 are preferably φ10 grease injection ports.

[0025] The upper grease injection port 61 and the lower grease injection port 62 are both provided with threaded plugs, and the threaded plugs are detachably connected to the upper grease injection port 61 , and the threaded plugs are also detachably connected to the lower grease injection port 62 .

[0026] The mixing valve further comprises an electric die head 4 , a flow meter is provided on the upstream pipeline connected to the mixing valve, the electric die head 4 is fixed on the second-stage valve body 5 , and both the electric die head 4 and the flow meter are electrically connected to the DCS.

[0027] The flanges connected at both ends of the mixing valve adopt standard flanges. The mixing valve flanges are divided into an upstream flange 11 and a downstream flange 12, which can be connected to the pipeline matching flanges using bolts, nuts and other fasteners. The mixing valve body is preferably made of stainless steel. The material of the flange is the same as that of the valve body. The corresponding flange specifications are selected according to different gas turbine models.

[0028] The hydrogen-mixed fuel gas enters the mixing valve through the first stage valve body 2 of the mixing valve. The first stage valve body 2 of the mixing valve and the upstream flange 11 of the mixing valve are an integral forged structure. The first stage valve body 2 of the mixing valve is equipped with a flow guide structure. After passing through the flow guide structure, the hydrogen-mixed fuel gas enters the second stage valve body 5 of the mixing valve. The second stage valve body 5 of the mixing valve and the downstream flange 12 are also an integral forged structure.

[0029] The mixing valve body adopts a two-stage structure, including an upstream first-stage valve body 2 and a downstream second-stage valve body 5. The upstream first-stage valve body 2 has a built-in guide head, and the fluid passing through the guide head enters the second-stage valve body 5 of the mixing valve. The second-stage valve body 5 has a built-in mixed flow turbine 7. The first-stage valve body 2 and the second-stage valve body 5 of the valve body are connected by detachable bolts 3, which is convenient for disassembly of the mixing valve during equipment inspection and maintenance. It can be disassembled regularly to check the degree of wear of the mixing valve turbine head 71, the connecting shaft 73 and the turbine bearing 74.

[0030] The key component of the mixed flow valve is the mixed flow turbine 7, which is located in the second-stage valve body 5 of the mixed flow valve and includes a turbine head 71, turbine blades 72, a connecting shaft 73 and a turbine shaft seat 74. Depending on the specifications of the mixed flow valve, the turbine head is equipped with 2 to 10 spiral blades. The turbine head and blades are made of materials with low density and high strength, which is conducive to improving the rotation speed of the mixed flow turbine. The turbine head 71 is connected to the turbine shaft 73 seat by a connecting shaft 74. A grease injection hole 6 is opened on the second-stage valve body 5 of the mixed flow valve at a position corresponding to the turbine shaft 73. Grease can be injected into the mixed flow turbine without disassembling the valve, and the mixed flow valve can be maintained.

[0031] The mixing valve is equipped with an electric die head 4. The DCS control system of the gas turbine sends an instruction to the electric die head switch of the mixing valve. When the gas turbine is in the ignition condition, the flow rate of the hydrogen-blended fuel gas in the pipeline is small, which can trigger the flow meter in the pipeline to send a signal to the DCS system of the gas turbine. After receiving the signal processing, the DCS sends an opening instruction to the electric die head of the mixing valve. The electric die head drives the mixing valve mixed flow turbine to rotate to mix the gas turbine.

[0032] The hydrogen-blended fuel engine burner is equipped with a mixing valve. The mixing valve operates based on the principle of conservation of fluid momentum and can be installed near the burner on the hydrogen-blended fuel gas inlet pipeline. When the hydrogen-blended fuel gas flows in the pipeline, the fluid passes through the pipeline and impacts the turbine blades, generating a driving force on the turbine, which then causes the turbine to overcome friction torque and fluid resistance torque to generate rotation. Within a certain range, the rotation speed of the mixed flow turbine is proportional to the flow rate of the hydrogen-blended fuel gas. , which allows the mixing valve to operate without external power, so that the hydrogen-blended fuel gas can be mixed evenly again. The evenly mixed fuel gas can immediately enter the combustion chamber without gas stratification due to long-distance transportation, which affects the combustion effect. If the gas turbine is in the ignition low-flow condition with 18% of the full-load fuel volume, the kinetic energy of the fluid is not enough to drive the mixing valve to rotate quickly. The flow meter in the pipeline can send a flow signal to the DCS control system, and the DCS can make a judgment to start the electric die head of the mixing valve, driving the turbine in the mixing valve to rotate, thereby achieving the effect of evenly mixing the hydrogen-blended fuel gas and meeting the requirements of multi-condition operation of the gas turbine.

[0033] The specific working process of the hydrogen-blended gas engine burner supporting mixing valve is as follows:

[0034] The hydrogen-mixed fuel gas passes through the first valve body 2 and enters the second valve body 5 of the mixing valve, impacting the turbine blades 72, generating a driving force on the mixed flow turbine head 71, which then causes the mixed flow turbine head 71 to overcome the friction torque and fluid resistance torque and generate rotation. The fuel gas passing through the mixed flow turbine 7 is remixed, making the hydrogen-mixed fuel gas more uniform.

[0035] The mixing valve is equipped with an electric die head 4, which is interlocked with the flow meter on the mixing pipeline through the DCS. The electric die head is equipped with a 380V power supply and receives analog signals from the DCS. The power level is inversely proportional to the flow rate detected by the flow meter on the hydrogen-blended fuel gas pipeline. That is, the smaller the flow rate, the greater the power, which drives the mixed flow turbine to rotate faster. When the amount of hydrogen-blended fuel gas in the pipeline reaches 30% of the load, the electric die head 4 of the mixing valve can be closed, and the mixed flow turbine is driven by the fluid momentum.

[0036] The grease injection hole is normally sealed by a threaded plug. When the mixed flow turbine 7 needs to be greased, the threaded plug of the grease injection hole is unscrewed and grease is injected inward with a grease gun. Regular maintenance of the valve can be completed without opening the valve body, making the normal operation and maintenance of the mixed flow valve more convenient and cost-effective.

[0037] The present invention discloses a mixing valve for a hydrogen-blended gas turbine burner. The mixing valve is installed on an inlet hydrogen-blended fuel gas pipeline near the combustion chamber of the gas turbine, and can solve the problem of uneven re-stratification and mixing of the hydrogen-blended fuel gas during transportation. Compared with the natural gas hydrogen-blending equipment at the upstream gate station, the mixing valve disclosed in the invention has a simple structure, is easy to install and maintain, and has a wide range of applications. It can be used on any pipeline for hydrogen-blended fuel gas transportation, and is particularly suitable for the hydrogen-blended fuel gas pipeline in front of the gas turbine burner, to ensure the uniformity of the hydrogen-blended fuel gas entering the combustion chamber of the gas turbine, make the combustion flame position and high-temperature area in the combustion chamber more stable, and effectively reduce the probability of backfire.

[0038] The technical means disclosed in the solutions of the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A mixing valve for a hydrogen-blended gas engine burner, characterized by: The mixed flow valve works based on the principle of conservation of fluid momentum and is installed on the hydrogen-blended fuel gas inlet pipeline close to the burner. The mixed flow valve body adopts a two-stage structure, including a first-stage valve body (2) and a second-stage valve body (5). The first-stage valve body (2) and the second-stage valve body (5) are detachably connected. A mixed flow turbine (7) is arranged in the second-stage valve body (5). The mixed flow turbine (7) includes a mixed flow turbine head (71), a connecting shaft (73) and a turbine bearing (74). The mixed flow turbine head (71) is provided with turbine blades (72) and a turbine head fixing fastener (75). The turbine blades (72) are sleeved on the connecting shaft (73). One end of the connecting shaft (73) is fixedly connected to the mixed flow turbine head (71) through the turbine head fixing fastener (75), and the other end of the connecting shaft (73) is rotatably connected to the turbine bearing (74). The upstream valve body (2) has a built-in flow guide head, and the fluid passing through the flow guide head enters the second valve body (5) of the mixing valve, and the second valve body (5) has a built-in mixed flow turbine (7); The mixing valve further comprises an electric die head (4), a flow meter is provided on an upstream pipeline connected to the mixing valve, the electric die head (4) is fixed on the second-stage valve body (5), and the electric die head (4) and the flow meter are both electrically connected to the DCS; When the gas turbine is in the ignition low flow condition with 18% of full load fuel volume, the kinetic energy of the fluid is insufficient to drive the mixing valve to rotate quickly. The flow meter in the pipeline can send a flow signal to the DCS control system, which makes a judgment and starts the electric die head of the mixing valve. The electric die head (4) is interlocked with the flow meter on the mixed flow pipeline through the DCS. The electric die head is equipped with a 380V power supply and receives an analog signal from the DCS. The power is inversely proportional to the flow rate detected by the flow meter on the hydrogen-blended fuel gas pipeline, that is, the smaller the flow rate, the greater the power, and the faster the mixed flow turbine rotates. When the amount of hydrogen-blended fuel gas in the pipeline reaches 30% of the load, the electric die head (4) of the mixed flow valve can be closed, and the mixed flow turbine is driven to rotate by the fluid momentum; the turbine blade (72) is spiral, and the spiral angle is 30~45°.

2. The mixing valve for a hydrogen-blended gas engine burner according to claim 1, characterized in that: The mixing valve further comprises a flange (1), wherein the flange (1) comprises an upstream flange (11) of the mixing valve and a downstream flange (12) of the mixing valve, wherein the upstream flange (11) of the mixing valve is fixedly connected to the first stage valve body (2), and the downstream flange (12) of the mixing valve is fixedly connected to the second stage valve body (5).

3. The mixing valve for a hydrogen-blended gas engine burner according to claim 1, characterized in that: The first-stage valve body (2) and the second-stage valve body (5) are detachably connected via bolts (3).

4. The mixing valve for a hydrogen-blended gas engine burner according to claim 1, characterized in that: The second-stage valve body (5) is also provided with a grease injection port (6), which includes an upper grease injection port (61) and a lower grease injection port (62). The upper grease injection port (61) and the lower grease injection port (62) are symmetrically fixed at the upper and lower ends of the second-stage valve body (5).

5. The mixing valve for a hydrogen-blended gas engine burner according to claim 1, characterized in that: The upper grease injection port (61) and the lower grease injection port (62) are both provided with a threaded plug, the threaded plug is detachably connected to the upper grease injection port (61), and the threaded plug is also detachably connected to the lower grease injection port (62).

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