A highly integrated new natural gas hydrogen blending device

Abstract

The utility model discloses a kind of highly integrated novel natural gas hydrogen mixing device, including natural gas intake block, gas mixing block and control module, and natural gas intake block is provided with natural gas inlet, natural gas flowmeter and natural gas flow regulating valve, gas mixing block is provided with hydrogen gas inlet, mixed gas outlet, mixed gas flowmeter;Control module is electrically connected with natural gas flowmeter, natural gas flow regulating valve and mixed gas flowmeter respectively, and control module is according to the data feedback of natural gas flowmeter, mixed gas flowmeter Real-time dynamic adjustment hydrogen mixing ratio.The utility model cooperates through control module, flow regulating valve, flowmeter, can realize closed-loop control, autonomous dynamic adjustment hydrogen mixing ratio, and pass through the structure of optimization mixing chamber Quality stability of mixed gas is guaranteed, adapts multiple application scenarios, help to promote natural gas hydrogen mixing technology industrialization, intelligent application.

Description

Technical Field

[0001] This utility model relates to the field of gas mixing equipment technology, and in particular to a novel natural gas hydrogen blending device that is based on closed-loop control, can precisely adjust the hydrogen blending ratio, and is highly integrated. Background Technology

[0002] Driven by the "dual carbon" goal, natural gas blending with hydrogen, as a low-carbon energy utilization approach, can leverage the existing natural gas pipeline network system, combining the cleanliness of hydrogen energy with the convenience of natural gas. However, existing blending units have significant shortcomings:

[0003] 1. Poor mixing uniformity: Relying on natural gas diffusion, it is easy to cause fluctuations in the hydrogen doping ratio, which affects the stability of downstream combustion equipment (such as unstable flame, backfire, etc.).

[0004] 2. Low flow regulation accuracy: It lacks efficient closed-loop control and is difficult to adapt to the precise hydrogen blending requirements of different scenarios (such as residential gas and industrial kilns).

[0005] 3. Lack of dynamic adjustment: The lack of real-time monitoring and dynamic adjustment of the mixed gas makes it impossible to ensure the long-term stability of the hydrogen blending ratio, which restricts the large-scale promotion of natural gas hydrogen blending technology.

[0006] In summary, traditional mixing methods (such as simple pipeline mixing and static mixers) cannot meet the requirements of "precise and intelligent" hydrogen doping due to low mixing efficiency and slow control. There is an urgent need to innovate the structure and control logic to break through the technical bottleneck. Utility Model Content

[0007] This invention aims to provide a novel, highly integrated natural gas hydrogen blending device based on closed-loop control, capable of precisely adjusting the hydrogen blending ratio. By integrating a high-precision flow regulating valve, a flow meter, and closed-loop control logic, a closed-loop system of "intake-regulation-mixing-monitoring-feedback regulation" is formed. This system achieves efficient mixing of natural gas and hydrogen, precise control of the hydrogen blending ratio, and dynamic adaptive adjustment, ensuring stable mixed gas quality, adapting to diverse application scenarios, and promoting the industrialization and intelligent application of natural gas hydrogen blending technology.

[0008] To achieve the above objectives, the following technical solution is provided:

[0009] A novel, highly integrated natural gas hydrogen blending device includes a natural gas inlet block, a gas mixing block, and a control module. The natural gas inlet block and the gas mixing block are connected by screws. The natural gas inlet block is provided with a natural gas inlet, and has a first flow channel and a second flow channel inside. It is externally connected to a natural gas flow meter and a natural gas flow regulating valve. The gas mixing block is provided with a hydrogen inlet and a mixed gas outlet, and has an ejector and a mixing chamber inside. It is externally connected to a mixed gas flow meter.

[0010] One end of the first flow channel is connected to the natural gas inlet, and the other end is connected to the inlet of the natural gas flow regulating valve. The natural gas flow meter is connected to the side wall of the first flow channel. One end of the second flow channel is connected to the outlet of the natural gas flow regulating valve, and the other end is connected to the beginning of the constriction flow channel of the ejector. The end of the constriction flow channel of the ejector, the hydrogen inlet, and the inlet of the mixing chamber are interconnected. The mixed gas flow meter is connected to the side wall of the mixing chamber.

[0011] The control module is electrically connected to the natural gas flow meter, the natural gas flow regulating valve, and the mixed gas flow meter, respectively. The control module dynamically adjusts the opening degree of the natural gas flow regulating valve based on the flow data feedback from the natural gas flow meter and the mixed gas flow meter and the set hydrogen blending ratio.

[0012] Preferably, a safety valve is connected to the gas mixing block, and the safety valve is connected to the gas outlet of the mixed gas to ensure timely pressure release in case of abnormal pressure, and to ensure stable and reliable operation of the device.

[0013] Preferably, the flow channel of the mixing chamber adopts a variable cross-section long flow channel structure, with its cross-section gradually increasing from left to right. This structural design of the mixing chamber can ensure that natural gas and hydrogen are fully mixed.

[0014] Preferably, the inner wall of the mixing chamber is provided with an anti-corrosion coating, which can reduce the flow resistance of the mixed gas, prevent the accumulation of impurities, and ensure the long-term stable operation of the device.

[0015] Preferably, the inner walls of the first flow channel, the second flow channel, the constriction flow channel of the ejector, and the mixing chamber are all chamfered.

[0016] Preferably, the natural gas flow regulating valve adopts a central hole for air intake and an edge for air exhaust, and the inlet and outlet of the natural gas flow regulating valve are respectively provided with a first sealing ring and a second sealing ring.

[0017] Preferably, a third sealing ring is provided at the interface between the natural gas intake block and the gas mixing block, and a fourth sealing ring is provided on the outer circumference of the ejector.

[0018] Preferably, the control module is fixed on the gas mixing block.

[0019] Compared with the prior art, this utility model has the following advantages:

[0020] (1) This utility model can achieve precise control of the hydrogen doping ratio through the collaboration of high-precision instruments and closed-loop control, so that the hydrogen doping ratio error is ≤0.5%, which meets the requirements of hydrogen doping accuracy in harsh application scenarios.

[0021] (2) By optimizing the structure of the mixing chamber for natural gas and hydrogen and adopting a longer and variable cross-section flow channel design, this utility model can improve the uniformity of gas mixing.

[0022] (3) This utility model can dynamically respond to changes in gas source pressure and load, automatically adjust the hydrogen doping ratio, and adapt to various scenarios.

[0023] (4) This utility model adopts a reasonable sealing method, with excellent sealing performance, safety and reliability, and is suitable for the flammable characteristics of hydrogen.

[0024] (5) This utility model has made anti-corrosion and low resistance design for the flow channel surface, which can ensure long-term stable operation and extend the equipment life. Attached Figure Description

[0025] Figure 1 This is a structural diagram of a highly integrated novel natural gas hydrogen blending device according to an embodiment of the present invention;

[0026] Figure 2 This is a cross-sectional view of a highly integrated novel natural gas hydrogen blending device according to an embodiment of the present invention;

[0027] Reference numerals: 1. Natural gas inlet block; 11. First mounting hole; 12. Natural gas inlet; 13. First flow channel; 14. Second flow channel; 2. Gas mixing block; 21. Second mounting hole; 22. Hydrogen inlet; 23. Mixed gas outlet; 24. Mixing chamber; 241. Anti-corrosion coating; 25. Third sealing ring; 26. Screw; 3. Natural gas flow regulating valve; 31. First sealing ring; 32. Second sealing ring; 4. Natural gas flow meter; 5. Ejector; 51. Contraction channel of ejector; 52. Fourth sealing ring; 6. Mixed gas flow meter; 7. Control module; 8. Safety valve. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0030] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0031] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0032] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0033] like Figure 1 The diagram shows the structure of a highly integrated novel natural gas hydrogen blending device according to this invention. It includes a natural gas inlet block 1 and a gas mixing block 2, which are connected by screws 26. The natural gas inlet block 1 and the gas mixing block 2 are respectively provided with a plurality of first mounting holes 11 and a plurality of second mounting holes 21, facilitating the fixed installation of this invention on other equipment.

[0034] The natural gas intake block 1 is equipped with a natural gas inlet 12, and has a first flow channel 13 and a second flow channel 14 inside. A natural gas flow regulating valve 3 and a natural gas flow meter 4 are connected to the natural gas intake block 1. The gas mixing block 2 is equipped with a hydrogen inlet 22 and a mixed gas outlet 23, and has an ejector 5 and a mixing chamber 24 inside. Externally, it is connected to a mixed gas flow meter 6, a control module 7, and a safety valve 8.

[0035] The natural gas flow regulating valve 3 is a high-precision electric proportional regulating valve with a central inlet for air intake and an edge outlet for air exhaust. The natural gas inlet 12 can be designed with either a threaded connection or a compression fitting connection as needed.

[0036] The control module 7 is electrically connected to the natural gas flow regulating valve 3, the natural gas flow meter 4, and the mixed gas flow meter 6, respectively, and is used to precisely control the hydrogen blending ratio of natural gas.

[0037] like Figure 2The diagram shows a cross-sectional view of a highly integrated novel natural gas hydrogen blending device according to this invention. One end of the first flow channel 13 is connected to the natural gas inlet 12, and the other end is connected to the inlet of the natural gas flow regulating valve 3. The natural gas flow meter 4 is connected to the side wall of the first flow channel 13 and is used to collect natural gas inlet flow data in real time. One end of the second flow channel 14 is connected to the outlet of the natural gas flow regulating valve 3, and the other end is connected to the head end of the constriction channel 51 of the ejector 5. The end of the constriction channel 51 of the ejector 5 is connected to the hydrogen inlet 2. The inlet of mixing chamber 24 and mixing chamber 2 are interconnected. Mixed gas flow meter 6 is connected to the side wall of mixing chamber 24 and is used to collect the discharge flow rate of mixed gas in real time. The end of mixing chamber 24 is connected to mixed gas outlet 23. After natural gas and hydrogen are fully mixed in mixing chamber 24, they are discharged through mixed gas outlet 23 and enter combustion equipment (such as steam turbine and gas stove). Safety valve 8 is connected to mixed gas outlet 23 to ensure timely pressure release in case of abnormal pressure and ensure stable and reliable operation of the device.

[0038] The ejector 5 adopts a variable cross-section design. The cross-section of the constriction channel 51 of the ejector 5 gradually narrows, the flow velocity increases, and the hydrogen inlet 22 forms a negative pressure, which ejects the hydrogen into the mixing chamber 24. The mixing chamber 24 adopts a variable cross-section design from small to large and has a long flow channel to ensure that the hydrogen and natural gas are fully mixed. The first flow channel 13, the second flow channel 14, the constriction channel 51 of the ejector 5 and the inner wall of the mixing chamber 24 are all chamfered, and the inner wall of the mixing chamber 24 is provided with an anti-corrosion coating 241 to reduce gas flow resistance, avoid impurity accumulation and ensure long-term stable operation.

[0039] The natural gas flow regulating valve 3 is provided with a first sealing ring 31 and a second sealing ring 32 at its center hole and edge outlet, respectively; the natural gas inlet block 1 and the gas mixing block 2 adopt an end face sealing structure, and a third sealing ring 25 is provided on the connection interface; the ejector 5 and the gas mixing block 2 adopt an axial sealing structure, and a fourth sealing ring 52 is provided on the outer circumference of the ejector.

[0040] Working principle of this utility model:

[0041] Natural gas is injected through the natural gas inlet 12, passing through the first flow channel 13, the natural gas flow rate 4, the natural gas flow rate regulating valve 3, the second flow channel 14, and the contraction flow channel 51 of the ejector 5 before entering the mixing chamber 24. Hydrogen gas is injected into the mixing chamber 24 through the hydrogen inlet 22 under the action of the ejector 5. The natural gas and hydrogen gas are thoroughly and uniformly mixed in the mixing chamber 24, and then discharged through the mixed gas outlet 23. The natural gas flow meter 4 monitors the natural gas inlet flow rate in real time, the mixed gas flow meter 6 monitors the mixed gas outlet flow rate in real time, and the control module 7 calculates the hydrogen blending ratio in real time according to the following formula:

[0042] Hydrogen blending ratio = (mixed gas discharge flow rate - natural gas inlet flow rate) / mixed gas discharge flow rate;

[0043] Then, based on the hydrogen blending ratio, the flow rate of the natural gas flow regulating valve 3 is adjusted in a timely manner to change the hydrogen blending ratio. The adjusted hydrogen blending ratio is then compared with the preset value until the preset hydrogen blending ratio is reached. If the natural gas inlet flow rate fluctuates, the hydrogen blending ratio can also be dynamically adjusted to ensure that the natural gas flow rate dynamically matches the target hydrogen blending ratio.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A novel, highly integrated natural gas hydrogen blending device, characterized in that, The system includes a natural gas inlet block, a gas mixing block, and a control module. The natural gas inlet block and the gas mixing block are connected by screws. The natural gas inlet block is provided with a natural gas inlet, and has a first flow channel and a second flow channel inside. It is externally connected to a natural gas flow meter and a natural gas flow regulating valve. The gas mixing block is provided with a hydrogen inlet and a mixed gas outlet, and has an ejector and a mixing chamber inside. It is externally connected to a mixed gas flow meter. One end of the first flow channel is connected to the natural gas inlet, and the other end is connected to the inlet of the natural gas flow regulating valve. The natural gas flow meter is connected to the side wall of the first flow channel. One end of the second flow channel is connected to the outlet of the natural gas flow regulating valve, and the other end is connected to the beginning of the constriction flow channel of the ejector. The end of the constriction flow channel of the ejector, the hydrogen inlet, and the inlet of the mixing chamber are interconnected. The mixed gas flow meter is connected to the side wall of the mixing chamber. The control module is electrically connected to the natural gas flow meter, the natural gas flow regulating valve, and the mixed gas flow meter, respectively. The control module dynamically adjusts the opening degree of the natural gas flow regulating valve based on the flow data feedback from the natural gas flow meter and the mixed gas flow meter and the set hydrogen blending ratio.

2. The highly integrated novel natural gas hydrogen blending device according to claim 1, characterized in that, A safety valve is connected to the gas mixing block, and the safety valve is connected to the gas outlet of the mixed gas.

3. The highly integrated novel natural gas hydrogen blending device according to claim 2, characterized in that, The mixing chamber adopts a variable cross-section long flow channel structure, with its cross-section gradually increasing from left to right.

4. The highly integrated novel natural gas hydrogen blending device according to claim 3, characterized in that, The inner wall of the mixing chamber is provided with an anti-corrosion coating.

5. The highly integrated novel natural gas hydrogen blending device according to claim 4, characterized in that, The inner walls of the first flow channel, the second flow channel, the constriction flow channel of the ejector, and the mixing chamber are all chamfered.

6. The highly integrated novel natural gas hydrogen blending device according to claim 1, characterized in that, The natural gas flow regulating valve adopts a central hole for air intake and an edge outlet for air exhaust. The inlet and outlet of the natural gas flow regulating valve are respectively equipped with a first sealing ring and a second sealing ring.

7. The highly integrated novel natural gas hydrogen blending device according to claim 1, characterized in that, A third sealing ring is provided at the interface between the natural gas intake block and the gas mixing block, and a fourth sealing ring is provided on the outer circumference of the ejector.

8. The highly integrated novel natural gas hydrogen blending device according to claim 1, characterized in that, The control module is fixed on the gas mixing block.

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