A hydrogen - mixed device system and method for a gas turbine

Abstract

The present invention relates to a hydrogen - mixed device system and method for a gas turbine. By arranging a transition unit before the hydrogen - mixed device, the natural gas and hydrogen are subjected to sufficient pre - mixing pretreatment in the transition unit, effectively improving the uniformity of the mixture of hydrogen and natural gas and the stability of flow, which is conducive to achieving an efficient and sufficient combustion effect. By using a control device to display the volume flow rates of natural gas and hydrogen in real time, calculate the hydrogen - mixing ratio in real time, and control the opening degree of the flow regulating valve of the hydrogen pipeline, the final error of the hydrogen - mixing ratio is as low as 0.25%, achieving high - precision control of the hydrogen - mixing ratio, which is conducive to reaching the preset load of the gas turbine and realizing the safe and stable operation of the gas turbine.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas hydrogen mixing, and particularly relates to a hydrogen mixing device system and method for a gas turbine. Background Technique

[0002] Gas power generation systems have gradually become important peak shaving power sources in the energy and power system due to their advantages such as fast start-stop speed, strong load regulation ability, and few restricted conditions. However, at present, gas power generation systems still have prominent problems such as tight gas source supply, high natural gas power generation cost, and carbon dioxide emissions. Therefore, the development of hydrogen fuel gas turbines will be beneficial to resolving many problems such as natural gas scarcity and energy security, and realizing the consumption and utilization of renewable energy such as abandoned wind and abandoned light and low-carbon emissions on the power generation side.

[0003] Hydrogen co-firing has relatively high requirements for the precise control of the hydrogen mixing ratio. The instantaneous change of the fuel composition will affect the combustion stability and the safe operation of the gas turbine. At the same time, hydrogen co-firing also requires strict control of the mixing uniformity and flow stability of hydrogen and natural gas.

[0004] CN 217635105U discloses a gas hydrogen mixing device, including a hydrogen pipeline structure, a gas pipeline structure, a mixed gas pipeline structure, and a control structure; when in use, the upstream natural gas enters the flowmeter after pressure regulation at pressure P1. The flowmeter transmits the standard flow signal after temperature and pressure compensation to the control system. The control system controls the opening of the explosion-proof electric control valve according to the preset flow ratio and the instantaneous flow rate of hydrogen, so that hydrogen enters the static mixer at a flow rate calculated according to the set mixing ratio at a pressure P2 higher than P1 and mixes with natural gas. The mixed gas is further fully mixed through the stainless steel orifice plate corrugated packing built in the static mixer.

[0005] CN 111992071A discloses a hydrogen energy utilization gas blending system and a hydrogen and natural gas ratio control method. The source hydrogen enters the mixing gas pipeline through the inlet ball valve, pneumatic cut-off valve, and filter, measures the hydrogen flow rate through the flowmeter, and then enters the mixing device through the outlet ball valve after adjusting the hydrogen consumption through the regulating valve; the source natural gas enters the mixing gas pipeline through the inlet ball valve, filter cut-off valve, is pressure-regulated and metered, and then enters the mixing device through the regulating valve to the outlet ball valve; the detection equipment at the mixing gas outlet and the flow value after temperature and pressure compensation jointly control the opening of the regulating valves on the natural gas and hydrogen pipelines, control the hydrogen volume flow rate, and perform online adjustment and automatic following of the hydrogen addition amount to achieve the ratio of natural gas and hydrogen.

[0006] In the hydrogen - mixing device provided in the above - mentioned prior art, natural gas and hydrogen are divided into two paths and are sent to the fuel system of the gas turbine after freely mixing in the mixing device. This mixing method cannot effectively ensure the uniformity of the mixture of hydrogen and natural gas and the stability of the flow, and it is extremely easy to cause the operation of the gas turbine to deviate from the preset working conditions, affecting the safe and stable operation of the gas turbine.

[0007] Aiming at the deficiencies of the prior art, there is an urgent need to provide a gas - turbine hydrogen - mixing device system that can accurately control the hydrogen - doping ratio and achieve uniform mixing and stable flow of natural gas and hydrogen. Summary of the Invention

[0008] The purpose of the present invention is to provide a gas - turbine hydrogen - mixing device system and method. By optimizing the design of devices such as the transition unit, the uniformity of the mixture of hydrogen and natural gas and the stability of the flow are improved. At the same time, the hydrogen - doping ratio can be accurately controlled, and the error of the hydrogen - doping ratio is reduced to the lowest range.

[0009] To achieve the purpose of this invention, the following technical solutions are adopted:

[0010] In the first aspect, the present invention provides a gas - turbine hydrogen - mixing device system, which includes a transition unit, a hydrogen - mixing device, a heat - exchange device, and a gas - component analysis device connected in sequence.

[0011] The transition unit includes a premixing device and a rectifying device connected in sequence. The premixing device is independently connected to a natural - gas pipeline and a hydrogen pipeline respectively. The natural - gas pipeline and the hydrogen pipeline are respectively provided with a flow - regulating valve, a pressure transmitter, and a flowmeter. The pressure transmitter and the flowmeter are respectively used to measure the pressure and flow rate of the natural gas and hydrogen in real - time and send the measurement signals to the control device. The gas - component analysis device is used to measure the volume flow rates of natural gas and hydrogen in the mixed fuel gas in real - time and send the measurement signals to the control device. The control device is used to calculate the hydrogen - mixing ratio in real - time and control the opening degree of the flow - regulating valve of the hydrogen pipeline.

[0012] In the gas - turbine hydrogen - mixing device system provided by the present invention, by setting a transition unit before the hydrogen - mixing device, the natural gas and hydrogen are fully pre - treated before mixing in the premixing device and the rectifying device, effectively improving the uniformity of the mixture of hydrogen and natural gas and the stability of the flow. By using the control device to display the volume flow rates of natural gas and hydrogen in real - time, calculate the hydrogen - mixing ratio in real - time, and control the opening degree of the flow - regulating valve of the hydrogen pipeline, the final error of the hydrogen - mixing ratio is as low as 0.25%, achieving high - precision control of the hydrogen - mixing ratio.

[0013] Preferably, the axial and radial directions of the premixing device are uniformly provided with air - guiding holes, and the air - guiding holes are connected to the hydrogen pipeline.

[0014] Preferably, the number of the air guide holes is 1 - 100, for example, it can be 1, 9, 16, 25, 50 or 100, but not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0015] Hydrogen is led out from the upstream hydrogen pipeline and evenly divided into multiple branches and injected into the premixing device through each air guide hole, so as to achieve sufficient premixing with the natural gas led out from the pipeline after the upstream pressure regulating station.

[0016] Preferably, the diameter of the air guide holes is 50 - 100 mm, for example, it can be 50 mm, 60 mm, 70 mm, 80 mm or 100 mm, but not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0017] Preferably, a filter screen is arranged inside the rectifying device.

[0018] After the fuel gas mixed with natural gas and hydrogen passes through the filter screen, the flow stability and uniformity of the mixed fuel gas will be further improved.

[0019] Preferably, the mesh number of the filter screen is 300 - 600 meshes, for example, it can be 300 meshes, 350 meshes, 400 meshes, 500 meshes or 600 meshes, but not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0020] Preferably, a flow guiding device is arranged inside the hydrogen mixing device, and the flow guiding device includes a first flow guiding plate and a second flow guiding plate.

[0021] Preferably, the included angle between the first flow guiding plate and the second flow guiding plate is 90°.

[0022] The flow guiding device can improve the distribution effect of the mixed fuel gas and eliminate the uneven flow during the actual operation to a certain extent.

[0023] Preferably, the included angle between the first flow guiding plate and the horizontal plane is 30 - 60°, for example, it can be 30°, 35°, 40°, 50° or 60°, but not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0024] Preferably, the included angle between the second flow guiding plate and the horizontal plane is 120 - 150°, for example, it can be 120°, 125°, 130°, 140° or 150°, but not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0025] Preferably, the hydrogen mixing device includes a hydrogen mixing tank.

[0026] Preferably, the heat exchange device includes a shell and tube heat exchanger.

[0027] The mixed fuel gas composed of natural gas and hydrogen enters the shell-and-tube heat exchanger and exchanges heat with the medium-pressure boiler feed water in the shell-and-tube heat exchanger. After the mixed fuel gas is heated, the molecular motion will be further enhanced, and the Wobbe index and mixing effect of the fuel gas will be improved.

[0028] Preferably, the gas composition analysis device includes a gas composition analyzer.

[0029] Preferably, the control device includes a control cabinet.

[0030] In a second aspect, the present invention provides a method for hydrogen mixing using the gas turbine hydrogen mixing device system described in the first aspect. The method includes the following steps:

[0031] Natural gas and hydrogen are successively subjected to premixing treatment, rectification treatment, mixing treatment, and heat exchange treatment. The obtained mixed fuel gas is subjected to volume flow measurement and hydrogen mixing ratio calculation to obtain the actual value of the hydrogen mixing ratio. The flow rate of the hydrogen is adjusted until the actual value of the hydrogen mixing ratio reaches the set value of the hydrogen mixing ratio, and then the mixed fuel gas is sent for combustion treatment.

[0032] The method provided by the present invention controls the flow rate and initial pressure of natural gas and hydrogen, and performs premixing treatment and rectification treatment before mixing treatment, so as to further improve the mixing uniformity and flow stability of natural gas and hydrogen, which is conducive to achieving efficient and complete combustion effects. By measuring the volume flow rate of the mixed fuel gas, calculating the actual value of the hydrogen mixing ratio, further regulating the hydrogen flow rate to reach the set value of the hydrogen mixing ratio, and then sending it for combustion treatment, the error of the hydrogen mixing ratio is as low as 0.25%, realizing high-precision control of the hydrogen mixing ratio, which is conducive to achieving the preset load of the gas turbine and realizing the safe and stable operation of the gas turbine.

[0033] Preferably, the pressure of the natural gas is 3 - 4 MPa, for example, it can be 3 MPa, 3.2 MPa, 3.5 MPa, 3.8 MPa or 4 MPa, but is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0034] Preferably, the flow rate of the natural gas is 15000 - 20000 m 3 / h, for example, it can be 15000 m 3 / h, 16000 m 3 / h, 18000 m 3 / h, 19000 m 3 / h or 20000 m 3 / h, but is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0035] Preferably, the pressure of the hydrogen gas is 3 - 4 MPa. For example, it can be 3 MPa, 3.2 MPa, 3.5 MPa, 3.8 MPa or 4 MPa, but is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0036] Preferably, the flow rate of the hydrogen gas is 3000 - 7000 m 3 / h. For example, it can be 3000 m 3 / h, 4000 m 3 / h, 5000 m 3 / h, 6000 m 3 / h or 7000 m 3 / h, but is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0037] Preferably, the time for the premixing treatment is 5 - 15 s. For example, it can be 5 s, 8 s, 10 s, 12 s or 15 s, but is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0038] Preferably, the time for the rectification treatment is 5 - 15 s. For example, it can be 5 s, 8 s, 10 s, 12 s or 15 s, but is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0039] Preferably, the time for the mixing treatment is 5 - 15 s. For example, it can be 5 s, 8 s, 10 s, 12 s or 15 s, but is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0040] Preferably, the temperature of the medium-pressure boiler feed water used for the heat exchange treatment is 150 - 250 °C. For example, it can be 150 °C, 180 °C, 200 °C, 220 °C or 250 °C, but is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0041] As a preferred technical solution of the method of the present invention, the method comprises the following steps:

[0042] Natural gas with a pressure of 3 - 4 MPa and a flow rate of 15000 - 20000 m 3 / h and hydrogen gas with a pressure of 3 - 4 MPa and a flow rate of 3000 - 7000 m 3 / h are successively subjected to a premixing treatment for 5 - 15 s, a rectification treatment for 5 - 15 s, a mixing treatment for 5 - 15 s, and a heat exchange treatment with medium-pressure boiler feed water at 150 - 250 °C. The obtained mixed fuel gas is subjected to volume flow measurement and hydrogen mixing ratio calculation to obtain the actual value of the hydrogen mixing ratio; the flow rate of the hydrogen gas is adjusted until the actual value of the hydrogen mixing ratio reaches the set value of the hydrogen mixing ratio, and then the mixed fuel gas is sent for combustion treatment.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] The hydrogen - mixing device system of the gas turbine provided by the present invention pre - processes natural gas and hydrogen before full mixing in the pre - mixing device and the rectifying device by setting a transition unit before the hydrogen - mixing device, effectively improving the uniformity of the hydrogen - natural gas mixture and the stability of the flow, which is beneficial to achieving an efficient and sufficient combustion effect; by using the control device to display the volume flow rates of natural gas and hydrogen in real time, calculate the hydrogen - mixing ratio in real time, and control the opening degree of the flow - regulating valve of the hydrogen pipeline, the final error of the hydrogen - mixing ratio is as low as 0.25%, achieving high - precision control of the hydrogen - mixing ratio, which is beneficial to reaching the preset load of the gas turbine and realizing the safe and stable operation of the gas turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a schematic structural diagram of the hydrogen - mixing device system of the gas turbine provided in Embodiment 1 of the present invention;

[0046] Wherein: 1, hydrogen - mixing tank; 2, shell - and - tube heat exchanger; 3, gas composition analyzer; 4, pre - mixing device; 5, rectifying device; 6, first flow - regulating valve; 7, first pressure transmitter; 8, second pressure transmitter; 9, third pressure transmitter; 10, first flowmeter; 11, second flowmeter; 12, third flowmeter; 13, second flow - regulating valve; 14, third flow - regulating valve; 15, fourth flow - regulating valve; 16, fifth flow - regulating valve; 17, fourth pressure transmitter; 18, fifth pressure transmitter; 19, sixth pressure transmitter; 20, seventh pressure transmitter; 21, fourth flowmeter; 22, fifth flowmeter; 23, sixth flowmeter; 24, seventh flowmeter; 25, control cabinet; 26, flow - guiding device; 27, stop valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0047] The technical solution of the present invention will be further described below through specific embodiments. Those skilled in the art should understand that the embodiments are only for helping to understand the present invention and should not be regarded as specific limitations on the present invention.

[0048] Embodiment 1

[0049] This embodiment provides a hydrogen - mixing device system of a gas turbine, as Figure 1 shown, the hydrogen - mixing device system of the gas turbine includes a transition unit, a hydrogen - mixing tank 1, a shell - and - tube heat exchanger 2, and a gas composition analyzer 3 connected in sequence;

[0050] The transition unit includes a premixing device 4 and a rectifying device 5 connected in sequence; the premixing device 4 is independently connected to a natural gas pipeline and a hydrogen pipeline respectively; the natural gas pipeline is provided with a first flow regulating valve 6, a first pressure transmitter 7, a second pressure transmitter 8, a third pressure transmitter 9, a first flowmeter 10, a second flowmeter 11, and a third flowmeter 12; the hydrogen pipeline is provided with a second flow regulating valve 13, a third flow regulating valve 14, a fourth flow regulating valve 15, a fifth flow regulating valve 16, a fourth pressure transmitter 17, a fifth pressure transmitter 18, a sixth pressure transmitter 19, a seventh pressure transmitter 20, a fourth flowmeter 21, a fifth flowmeter 22, a sixth flowmeter 23, and a seventh flowmeter 24; the pressure transmitters and flowmeters are respectively used to measure the pressure and flow rate of the natural gas and hydrogen in real time, and send the measurement signals to the control cabinet 25;

[0051] The axial and radial directions of the premixing device 4 are uniformly provided with 16 air guide holes with a diameter of 80 mm, and the air guide holes are connected to the hydrogen pipeline; the inside of the rectifying device 5 is provided with a filter screen with a mesh number of 400 meshes;

[0052] Six flow guiding devices 26 are uniformly arranged inside the hydrogen mixing tank 1, and the flow guiding device 26 includes a first flow guiding plate and a second flow guiding plate with an included angle of 90°; the included angle between the first flow guiding plate and the horizontal plane is 40°; the included angle between the second flow guiding plate and the horizontal plane is 130°;

[0053] The shell-and-tube heat exchanger 2 is provided with a medium-pressure boiler feed water inlet and a medium-pressure boiler feed water outlet;

[0054] The gas composition analyzer 3 is used to measure the volume flow rate of natural gas and hydrogen in the mixed fuel gas in real time, and send the measurement signals to the control cabinet 25; the control cabinet 25 is used to calculate the hydrogen mixing ratio in real time and control the opening degrees of the second flow regulating valve 13, the third flow regulating valve 14, the fourth flow regulating valve 15, and the fifth flow regulating valve 16; a stop valve 27 is arranged on the air supply pipeline where the gas composition analyzer 3 is located, and is used to control the mixed fuel gas to enter the fuel system of the gas turbine.

[0055] Embodiment 2

[0056] This embodiment provides a gas turbine hydrogen mixing device system, which is different from Embodiment 1 in that the diameter of the air guide hole is adjusted to 50 mm, the mesh number of the filter screen is adjusted to 300 meshes, the included angle between the first flow guiding plate and the horizontal plane is adjusted to 30°, and the included angle between the second flow guiding plate and the horizontal plane is adjusted to 120°, and the rest are the same as Embodiment 1.

[0057] Embodiment 3

[0058] This embodiment provides a gas turbine hydrogen mixing device system, which is different from that of Embodiment 1 in that the diameter of the air guide hole is adjusted to 100 mm, the mesh number of the filter screen is adjusted to 600 meshes, the included angle between the first deflector and the horizontal plane is adjusted to 60°, the included angle between the second deflector and the horizontal plane is adjusted to 150°, and the rest are the same as those in Embodiment 1.

[0059] Embodiment 4

[0060] This embodiment provides a gas turbine hydrogen mixing device system, which is different from that of Embodiment 1 in that the air guide hole is adjusted to a single hydrogen inlet, and the rest are the same as those in Embodiment 1.

[0061] Embodiment 5

[0062] This embodiment provides a gas turbine hydrogen mixing device system, which is different from that of Embodiment 1 in that the filter screen is not provided inside the rectifying device 5, and the rest are the same as those in Embodiment 1.

[0063] Embodiment 6

[0064] This embodiment provides a gas turbine hydrogen mixing device system, which is different from that of Embodiment 1 in that the flow guiding device 26 is not provided inside the hydrogen mixing tank 1, and the rest are the same as those in Embodiment 1.

[0065] Comparative Example 1

[0066] This comparative example provides a gas turbine hydrogen mixing device system, which is different from that of Embodiment 1 in that the transition unit has no premixing device 4, and the rest are the same as those in Embodiment 1.

[0067] Comparative Example 2

[0068] This comparative example provides a gas turbine hydrogen mixing device system, which is different from that of Embodiment 1 in that the transition unit has no rectifying device 5, and the rest are the same as those in Embodiment 1.

[0069] Application Example 1

[0070] This application example provides a method for hydrogen mixing using the gas turbine hydrogen mixing device system provided in Application Example 1. The method includes the following steps:

[0071] Natural gas with a pressure of 3.5 MPa and a flow rate of 18000 m 3 / h and natural gas with a pressure of 3.5 MPa and a flow rate of 5000 m 3The hydrogen gas at [flow rate] / h is successively subjected to premixing treatment for 10 s, rectification treatment for 10 s, mixing treatment for 10 s, and heat exchange treatment with medium-pressure boiler feed water at 200 °C. The obtained mixed fuel gas is subjected to volume flow measurement and hydrogen mixing ratio calculation to obtain the actual value of the hydrogen mixing ratio. The flow rate of the hydrogen gas is adjusted until the actual value of the hydrogen mixing ratio reaches the set value of the hydrogen mixing ratio, and then the mixed fuel gas is sent to combustion treatment.

[0072] In this application example, when hydrogen mixing is carried out using the said method, the mixing uniformity and flow stability of natural gas and hydrogen in the obtained mixed fuel gas are relatively good, and the error of the hydrogen mixing ratio is within 0.25%.

[0073] Application Example 2

[0074] This application example provides a method for hydrogen mixing using the gas turbine hydrogen mixing device system provided in Application Example 1. The method includes the following steps:

[0075] Natural gas with a pressure of 3 MPa and a flow rate of 20000 m 3 / h and hydrogen with a pressure of 3 MPa and a flow rate of 7000 m 3 / h are successively subjected to premixing treatment for 15 s, rectification treatment for 15 s, mixing treatment for 15 s, and heat exchange treatment with medium-pressure boiler feed water at 150 °C. The obtained mixed fuel gas is subjected to volume flow measurement and hydrogen mixing ratio calculation to obtain the actual value of the hydrogen mixing ratio. The flow rate of the hydrogen gas is adjusted until the actual value of the hydrogen mixing ratio reaches the set value of the hydrogen mixing ratio, and then the mixed fuel gas is sent to combustion treatment.

[0076] In this application example, when hydrogen mixing is carried out using the said method, the mixing uniformity and flow stability of natural gas and hydrogen in the obtained mixed fuel gas are relatively good, and the error of the hydrogen mixing ratio is within 0.28%.

[0077] Application Example 3

[0078] This application example provides a method for hydrogen mixing using the gas turbine hydrogen mixing device system provided in Application Example 1. The method includes the following steps:

[0079] Natural gas with a pressure of 4 MPa and a flow rate of 15000 m 3 / h and hydrogen with a pressure of 4 MPa and a flow rate of 3000 m 3 / h are successively subjected to premixing treatment for 5 s, rectification treatment for 5 s, mixing treatment for 5 s, and heat exchange treatment with medium-pressure boiler feed water at 250 °C. The obtained mixed fuel gas is subjected to volume flow measurement and hydrogen mixing ratio calculation to obtain the actual value of the hydrogen mixing ratio. The flow rate of the hydrogen gas is adjusted until the actual value of the hydrogen mixing ratio reaches the set value of the hydrogen mixing ratio, and then the mixed fuel gas is sent to combustion treatment.

[0080] In this application example, when hydrogen mixing is carried out by using the said method, the mixing uniformity and flow stability of natural gas and hydrogen in the obtained mixed fuel gas are relatively good, and the error of the hydrogen mixing ratio is within 0.30%.

[0081] Application Example 4

[0082] This application example provides a method for hydrogen mixing by using the gas turbine hydrogen mixing device system provided in Application Example 2, and the steps of the method are the same as those in Application Example 1.

[0083] In this application example, when hydrogen mixing is carried out by using the said method, the mixing uniformity and flow stability of natural gas and hydrogen in the obtained mixed fuel gas are relatively good, and the error of the hydrogen mixing ratio is within 0.26%.

[0084] Application Example 5

[0085] This application example provides a method for hydrogen mixing by using the gas turbine hydrogen mixing device system provided in Application Example 3, and the steps of the method are the same as those in Application Example 1.

[0086] In this application example, when hydrogen mixing is carried out by using the said method, the mixing uniformity and flow stability of natural gas and hydrogen in the obtained mixed fuel gas are relatively good, and the error of the hydrogen mixing ratio is within 0.28%.

[0087] Application Example 6

[0088] This application example provides a method for hydrogen mixing by using the gas turbine hydrogen mixing device system provided in Application Example 4, and the steps of the method are the same as those in Application Example 1.

[0089] In this application example, when hydrogen mixing is carried out by using the said method, since the 16 air guide holes for hydrogen to enter the premixing device are adjusted to a single air inlet, the mixing uniformity of natural gas and hydrogen decreases, and the error of the hydrogen mixing ratio is within 0.50%.

[0090] Application Example 7

[0091] This application example provides a method for hydrogen mixing by using the gas turbine hydrogen mixing device system provided in Application Example 5, and the steps of the method are the same as those in Application Example 1.

[0092] In this application example, when hydrogen mixing is carried out by using the said method, since no filter screen is provided in the rectifying device, both the mixing uniformity and flow stability of natural gas and hydrogen decrease, and the error of the hydrogen mixing ratio is within 0.40%.

[0093] Application Example 8

[0094] This application example provides a method for hydrogen mixing by using the gas turbine hydrogen mixing device system provided in Application Example 6, and the steps of the method are the same as those in Application Example 1.

[0095] In this application example, the method is used for hydrogen mixing. Since no flow guide device is provided in the hydrogen mixing tank, the distribution effect of natural gas and hydrogen is poor, the mixed fuel gas flows unevenly, and the error of the hydrogen mixing ratio is 0.45%.

[0096] Comparative application example 1

[0097] This comparative application example provides a method for mixing hydrogen using the gas turbine hydrogen mixing device system provided in comparative example 1. There is no premixing treatment in the steps of the method, and the rest is the same as application example 1.

[0098] In this comparative application example, there is no premixing step, and the mixing uniformity and flow stability of natural gas and hydrogen are significantly reduced, and the error of the hydrogen mixing ratio is 0.75%.

[0099] Comparative Application Example 2

[0100] This comparative application example provides a method for hydrogen mixing using the gas turbine hydrogen mixing device system provided in comparative example 2. There is no rectification treatment in the steps of the method, and the rest is the same as application example 1.

[0101] In this comparative application example, there is no rectification step, and the mixing uniformity and flow stability of natural gas and hydrogen are significantly reduced, and the error of the mixed hydrogen ratio is 0.40%.

[0102] In summary, the gas turbine hydrogen mixing device system provided by the present invention, by arranging a transition unit before the hydrogen mixing device, pre-treats the natural gas and hydrogen in the pre-mixing device and the rectifying device before fully mixing, effectively improves the uniformity of the mixing of hydrogen and natural gas and the stability of the flow, which is conducive to achieving efficient and sufficient combustion effects; by using a control device to display the volume flow of natural gas and hydrogen in real time, calculate the hydrogen mixing ratio in real time, and control the opening of the flow regulating valve of the hydrogen pipeline, the final error of the hydrogen mixing ratio is reduced to 0.25%, thereby achieving high-precision control of the hydrogen mixing ratio, which is conducive to achieving the preset load of the gas turbine and realizing safe and stable operation of the gas turbine.

[0103] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention are within the protection scope and disclosure scope of the present invention.

Claims

1. A hydrogen - mixing device system for a gas turbine, characterized in that, The gas turbine hydrogen - mixing device system includes a transition unit, a hydrogen - mixing device, a heat - exchange device, and a gas - composition analysis device connected in sequence; The transition unit includes a premixing device and a rectifying device connected in sequence; the premixing device is independently connected to a natural - gas pipeline and a hydrogen pipeline respectively. The natural - gas pipeline and the hydrogen pipeline are respectively provided with a flow - regulating valve, a pressure transmitter, and a flowmeter. The pressure transmitter and the flowmeter are respectively used to measure the pressure and flow rate of the natural gas and hydrogen in real time, and send the measurement signals to the control device; the gas - composition analysis device is used to measure the volume flow rates of the natural gas and hydrogen in the mixed fuel gas in real time, and send the measurement signals to the control device; the control device is used to calculate the hydrogen - mixing ratio in real time and control the opening degree of the flow - regulating valve of the hydrogen pipeline.

2. The gas turbine hydrogen mixing device system according to claim 1, characterized in that The axial and radial directions of the premixing device are evenly provided with gas - guiding holes, and the gas - guiding holes are connected to the hydrogen pipeline.

3. The gas turbine hydrogen mixing device system according to claim 2, characterized in that, The diameter of the gas - guiding hole is 50 - 100 mm.

4. The gas turbine hydrogen mixing device system according to claim 1, characterized in that, A filter screen is arranged inside the rectifying device.

5. The gas turbine hydrogen mixing device system according to claim 4, characterized in that, The mesh number of the filter screen is 300 - 600 meshes.

6. The hydrogen - mixing device system of a gas turbine according to claim 1, wherein, A flow - guiding device is arranged inside the hydrogen - mixing device, and the flow - guiding device includes a first flow - guiding plate and a second flow - guiding plate.

7. The gas turbine hydrogen mixing device system according to claim 6, wherein, The included angle between the first flow - guiding plate and the second flow - guiding plate is 90°.

8. The hydrogen - mixing device system of a gas turbine according to claim 6, characterized in that, The included angle between the first flow - guiding plate and the horizontal plane is 30 - 60°.

9. The gas turbine hydrogen mixing device system according to claim 6, characterized in that, The included angle between the second flow - guiding plate and the horizontal plane is 120 - 150°.

10. A method for hydrogen mixing using the gas turbine hydrogen mixing device system according to any one of claims 1-9, characterized in that, The method includes the following steps: The natural gas and hydrogen are sequentially subjected to premixing treatment, rectifying treatment, mixing treatment, and heat - exchange treatment. The obtained mixed fuel gas is subjected to volume - flow measurement and hydrogen - mixing - ratio calculation to obtain the actual value of the hydrogen - mixing ratio; the flow rate of the hydrogen is adjusted until the actual value of the hydrogen - mixing ratio reaches the set value of the hydrogen - mixing ratio, and then the mixed fuel gas is sent for combustion treatment.

11. The method according to claim 10, characterized in that, The pressure of the natural gas is 3 - 4 MPa.

12. The method according to claim 10, characterized in that, The flow rate of the natural gas is 15,000 - 20,000 m 3 / h.

13. The method according to claim 10, characterized in that, The pressure of the hydrogen is 3 - 4 MPa.

14. The method according to claim 10, wherein The flow rate of the hydrogen gas is 3000 - 7000 m 3 / h.

15. The method according to claim 10, wherein The time of the premixing treatment is 5 - 15 s.

16. The method according to claim 10, wherein The time of the rectifying treatment is 5 - 15 s.

17. The method according to claim 10, wherein The time of the mixing treatment is 5 - 15 s.

18. The method according to claim 10, characterized in that, The temperature of the medium - pressure boiler feed water used for the heat - exchange treatment is 150 - 250 °C.

19. The method according to claim 10, wherein The method includes the following steps: Natural gas with a pressure of 3 - 4 MPa and a flow rate of 15,000 - 20,000 m 3 / h and hydrogen with a pressure of 3 - 4 MPa and a flow rate of 3,000 - 7,000 m 3 / h are successively subjected to premixing treatment for 5 - 15 s, rectification treatment for 5 - 15 s, mixing treatment for 5 - 15 s, and heat exchange treatment with medium-pressure boiler feed water at 150 - 250 °C. The obtained mixed fuel gas is subjected to volume flow measurement and hydrogen mixing ratio calculation to obtain the actual value of the hydrogen mixing ratio; the flow rate of the hydrogen is adjusted until the actual value of the hydrogen mixing ratio reaches the set value of the hydrogen mixing ratio, and then the mixed fuel gas is sent to combustion treatment.

Images