Natural gas proportion hydrogen doping proportioning equipment

Abstract

A natural gas proportion hydrogen doping proportioning device is provided with a first adjusting valve and a second adjusting valve, and a pressure balance gas inlet of the first adjusting valve is connected with a pressure balance gas inlet of the second adjusting valve through a pressure adjusting pipeline. Finally, the upper ends and the lower ends of the elastic diaphragms of the first adjusting valve and the second adjusting valve are kept balanced, so that the outlet pressure of the first adjusting valve and the second adjusting valve is the same, the output proportion of hydrogen is accurately adjusted and controlled through the proportional valve, and mixing of natural gas and hydrogen is accurately and efficiently completed.

Description

Technical Field

[0001] The utility model relates to the field of gas proportion mixing equipment, in particular to natural gas proportion hydrogen blending equipment. Background Art

[0002] Natural gas-hydrogen mixed fuel (HCNG) is a gaseous alternative fuel obtained by mixing natural gas and hydrogen in a specific ratio. It combines the advantages of hydrogen's fast combustion rate, wide ignition margin, and natural gas's high volumetric calorific value. However, depending on the application, the ratio of HCNG often requires more stringent requirements. However, existing HCNG mixing equipment cannot accurately and efficiently control the mixing process. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the utility model provides a natural gas-hydrogen mixing proportioning device, which solves the problem that the existing natural gas-hydrogen mixing equipment cannot complete the mixing process accurately and efficiently.

[0004] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0005] A natural gas proportional hydrogen blending device is provided with a natural gas inlet, the natural gas inlet is connected to a natural gas pipeline, a gas mixing port is provided on the natural gas pipeline, and a first regulating valve is provided between the natural gas inlet and the gas mixing port on the natural gas pipeline; a hydrogen inlet is also provided, the hydrogen inlet is connected to a second regulating valve, the second regulating valve is connected to a proportional valve, the proportional valve is connected to the gas mixing port, the first regulating valve and the second regulating valve are both provided with a pressure balancing gas inlet, the pressure balancing gas inlet of the first regulating valve and the pressure balancing gas inlet of the second regulating valve are respectively connected to two ends of a pressure regulating pipeline; a pressure regulating inflation port is provided on the pressure regulating pipeline, and the pressure regulating inflation port is connected to an inflation device.

[0006] Preferably, the first regulating valve and the second regulating valve are provided with a main air cavity and a balancing air cavity, the balancing air cavity and the main air cavity are separated by an elastic diaphragm, and the balancing air cavity and the main air cavity are respectively located at the upper and lower ends of the elastic diaphragm, and a valve seat, an air inlet and an air outlet are provided in the main air cavity, a valve core is fixedly connected to the middle part of the lower end of the elastic diaphragm, the valve core is connected to the valve seat, and the lower end of the elastic diaphragm is also connected to a reset spring.

[0007] Preferably, the inflation device is provided with a gas buffer tank and a tank body inflation port, the pressure regulating inflation port is connected to the side end of the gas buffer tank, the tank body inflation port is connected to the upper end of the gas buffer tank, a first shut-off valve is also provided between the tank body inflation port and the gas buffer tank, and a second shut-off valve and a first pressure gauge are also provided on the gas buffer tank.

[0008] Preferably, the natural gas pipelines merge at the gas mixing port to form a mixed gas pipeline, a measuring port is provided on the mixed gas pipeline, and a second pressure gauge is provided near the measuring port.

[0009] The utility model provides a natural gas hydrogen blending equipment with the following beneficial effects:

[0010] By setting a first regulating valve and a second regulating valve, and connecting the pressure balancing gas inlet of the first regulating valve and the pressure balancing gas inlet of the second regulating valve through a pressure regulating pipeline, and charging the pressure regulating inflation port, the upper and lower ends of the elastic diaphragms of the first regulating valve and the second regulating valve are finally balanced, so that the outlet pressures of the first regulating valve and the second regulating valve are made the same, and then the output ratio of hydrogen is precisely controlled by the proportional valve, so that the mixing of natural gas and hydrogen is completed accurately and efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the connection relationship between the various components of the utility model;

[0012] Figure 2 This is a structural diagram of the first regulating valve or the second regulating valve of the utility model.

[0013] In the figure, 1-natural gas inlet, 11-natural gas pipeline, 2-mixing port, 21-hydrogen inlet, 3a-first regulating valve, 3b-second regulating valve, 31-pressure balancing gas inlet, 32-main gas cavity, 33-balancing gas cavity, 34-elastic diaphragm, 35-valve seat, 36-air inlet, 37-air outlet, 38-valve core, 39-reset spring, 4-proportional valve, 5-pressure regulating pipeline, 51-pressure regulating charging port, 6-charging equipment, 61-gas buffer tank, 62-tank body charging port, 7a-first shut-off valve, 7b-second shut-off valve, 8a-first pressure gauge, 8b-second pressure gauge, 9-mixed gas pipeline, 91-measuring port. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0015] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on specific circumstances.

[0016] In the description of the embodiments of the present invention, it should be noted that the terms "upper", "lower", "inside" and "outside" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the embodiments of the present invention.

[0017] See also Figure 1 , an embodiment of the utility model provides a technical solution: a natural gas proportional hydrogen blending device, provided with a natural gas inlet 1, the natural gas inlet 1 is connected to a natural gas pipeline 11, the natural gas pipeline 11 is provided with a gas mixing port 2, the natural gas pipeline 11 is further provided with a first regulating valve 3a between the natural gas inlet 1 and the gas mixing port 2; a hydrogen inlet 21 is further provided, the hydrogen inlet 21 is connected to a second regulating valve 3b, the second regulating valve 3b is connected to a proportional valve 4, the proportional valve 4 is connected to the gas mixing port 2, the first regulating valve 3a and the second regulating valve 3b are both provided with a pressure balancing gas inlet 31, the pressure balancing gas inlet 31 of the first regulating valve 3a and the pressure balancing gas inlet 31 of the second regulating valve 3b are respectively connected to both ends of a pressure regulating pipeline 5; the pressure regulating pipeline 5 is provided with a pressure regulating charging port 51, and the pressure regulating charging port 51 is connected to a charging device 6. It should be noted that: the inflation device 6 is inflated to the pressure-regulating inflation port 51, and enters the pressure-balancing air inlet 31 set by the first regulating valve 3a and the second regulating valve 3b respectively through the pressure-regulating pipeline 5, so that the outlet pressures of the first regulating valve 3a and the second regulating valve 3b are kept consistent; the working principle of the proportional valve 4 is based on the electronic control method to realize throttling control of the flow rate. It amplifies the power through the proportional amplifier through the command signal, and outputs current proportionally to the proportional electromagnet of the proportional valve 4. The proportional electromagnet outputs force and moves the position of the valve core proportionally. The position sensor monitors the valve core position, feeds back the command signal, and continuously adjusts the position to achieve precise control of the valve core position, thereby achieving precise proportional throttling control.

[0018] See also Figure 2, in this embodiment, the first regulating valve 3a and the second regulating valve 3b are provided with a main air chamber 32 and a balance air chamber 33. The balance air chamber 33 and the main air chamber 32 are separated by an elastic diaphragm 34, and the balance air chamber 33 and the main air chamber 32 are respectively located at the upper and lower ends of the elastic diaphragm 34. A valve seat 35, an air inlet 36, and an air outlet 37 are provided in the main air chamber 32. The middle part of the lower end of the elastic diaphragm 34 is fixedly connected with a valve core 38, and the valve core 38 is connected to the valve seat 35. A return spring 39 is also connected to the lower end of the elastic diaphragm 34. It should be specially noted that: the inflation device 6 respectively leads gas to the pressure balance air inlets 31 of the first regulating valve 3a and the second regulating valve 3b through the pressure regulating pipeline 5. Then, the pressures on the upper ends of the elastic diaphragms 34 of the first regulating valve 3a and the second regulating valve 3b are the same. The elastic diaphragm 34 compresses the return spring 39 and drives the valve core 38 to move towards the valve seat 35, and finally keeps the upper and lower parts of the elastic diaphragm 34 balanced. Then, the pressures of the main air chamber 32 and the balance air chamber 33 are the same, and the pressures of the air outlets 37 of the first regulating valve 3a and the second regulating valve 3b are the same.

[0019] Please refer to Figure 1 , in this embodiment, the inflation device 6 is provided with a gas buffer tank 61 and a tank inflation port 62. The pressure regulating inflation port 51 is connected to the side end of the gas buffer tank 61, and the tank inflation port 62 is connected to the upper end of the gas buffer tank 61. A first cut-off valve 7a is also provided between the tank inflation port 62 and the gas buffer tank 61. A second cut-off valve 7b and a first pressure gauge 8a are also provided on the gas buffer tank 61. It should be specially noted that: the working process of the gas buffer tank 61 is to fill or supplement gas into the gas buffer tank 61 through the tank inflation port 62. Usually, the gas filled is air or nitrogen. The first cut-off valve 7a sets a monitoring value P1. When the pressure in the gas buffer tank 61 is less than P1, the first cut-off valve 7a opens to supplement gas to the gas buffer tank 61. The second cut-off valve 7b sets a monitoring value P2 (P1 < P2). When the pressure value exceeds P2, the second cut-off valve 7b opens to discharge gas, and at the same time, the first cut-off valve 7a closes. In this way, the pressure in the gas buffer tank 61 is always maintained between P1 and P2, which not only avoids the failure of the pressure balance function of the first regulating valve 3a and the second regulating valve 3b due to too small pressure in the pressure regulating pipeline 5, but also avoids danger caused by too large pressure value in the gas buffer tank 61.

[0020] Please refer to Figure 1 , in this embodiment, the natural gas pipeline 11 forms a mixed gas pipeline 9 after converging through the gas mixing port 2. A measuring port 91 is provided on the mixed gas pipeline 9, and a second pressure gauge 8b is provided near the measuring port 91. It should be specially noted that: the measuring port 91 is convenient for detecting the gas mixing ratio, as a verification of the hydrogen blending effect or as a data reference for adjusting the proportional valve 4.

[0021] Working principle and usage process of the utility model: When in use, natural gas is introduced through the natural gas inlet 1, and hydrogen is introduced through the hydrogen inlet 21. The hydrogen converges with the natural gas at the gas mixing port 2 and enters the mixing gas pipeline 9 to form a mixed gas. Gas is filled into the gas buffer tank 61 through the tank body inflation port 62. The first cut-off valve 7a sets the monitoring value P1. When the pressure in the gas buffer tank 61 is less than P1, the first cut-off valve 7a opens to supplement gas to the gas buffer tank 61. The second cut-off valve 7b sets the monitoring value P2 (P1 < P2). When the pressure value exceeds P2, the second cut-off valve 7b opens to discharge gas, and at the same time, the first cut-off valve 7a closes. The gas in the gas buffer tank 61 enters the pressure regulating pipeline 5 through the pressure regulating inflation port 51 and finally enters the balance gas chambers 33 of the first regulating valve 3a and the second regulating valve 3b, making the pressure values at the outlet ports 37 of the first regulating valve 3a and the second regulating valve 3b the same. Then, through the precise throttling control of the hydrogen by the proportional valve 4, the natural gas and hydrogen are mixed efficiently and precisely.

[0022] The above has shown and described the basic principles, main features and advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic features of the utility model, the utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0023] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A natural gas hydrogen blending equipment, characterized in that: A natural gas inlet (1) is provided, the natural gas inlet (1) is connected to a natural gas pipeline (11), a gas mixing port (2) is provided on the natural gas pipeline (11), and a first regulating valve (3a) is provided between the natural gas inlet (1) and the gas mixing port (2) on the natural gas pipeline (11); a hydrogen inlet (21) is also provided, the hydrogen inlet (21) is connected to a second regulating valve (3b), the second regulating valve (3b) is connected to a proportional valve (4), the proportional valve (4) is connected to the gas mixing port (2), the first regulating valve (3a) and the second regulating valve (3b) are both provided with a pressure balancing gas inlet (31), the pressure balancing gas inlet (31) of the first regulating valve (3a) and the pressure balancing gas inlet (31) of the second regulating valve (3b) are respectively connected to two ends of a pressure regulating pipeline (5); a pressure regulating inflation port (51) is provided on the pressure regulating pipeline (5), and the pressure regulating inflation port (51) is connected to an inflation device (6).

2. The natural gas hydrogen blending equipment according to claim 1, characterized in that: The first regulating valve (3a) and the second regulating valve (3b) are provided with a main air cavity (32) and a balancing air cavity (33). The balancing air cavity (33) and the main air cavity (32) are separated by an elastic diaphragm (34), and the balancing air cavity (33) and the main air cavity (32) are respectively located at the upper and lower ends of the elastic diaphragm (34). A valve seat (35), an air inlet (36), and an air outlet (37) are provided in the main air cavity (32). A valve core (38) is fixedly connected to the middle of the lower end of the elastic diaphragm (34), and the valve core (38) is connected to the valve seat (35). A return spring (39) is also connected to the lower end of the elastic diaphragm (34).

3. The natural gas hydrogen blending equipment according to claim 1, characterized in that: The inflation device (6) is provided with a gas buffer tank (61) and a tank body inflation port (62), the pressure regulating inflation port (51) is connected to the side end of the gas buffer tank (61), the tank body inflation port (62) is connected to the upper end of the gas buffer tank (61), a first shut-off valve (7a) is further provided between the tank body inflation port (62) and the gas buffer tank (61), and a second shut-off valve (7b) and a first pressure gauge (8a) are further provided on the gas buffer tank (61).

4. The natural gas hydrogen blending equipment according to claim 1, characterized in that: The natural gas pipeline (11) is merged through the gas mixing port (2) to form a mixed gas pipeline (9). The mixed gas pipeline (9) is provided with a measuring port (91), and a second pressure gauge (8b) is provided near the measuring port (91).

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