Natural gas and hydrogen mixing system

Abstract

The invention discloses a natural gas and hydrogen mixing system which comprises a natural gas pressure stabilizing assembly, a hydrogen pressure regulating assembly and a mixing assembly. The natural gas pressure stabilizing assembly comprises a natural gas pipeline, a natural gas input port is formed in one end of the natural gas pipeline, a pressure stabilizing unit is arranged on the natural gas pipeline, and a natural gas output port communicated with the mixing assembly is formed in the other end of the natural gas pipeline; the hydrogen pressure regulating assembly comprises a hydrogen pipeline, a hydrogen input port is formed in one end of the hydrogen pipeline, a pressure regulating unit is arranged on the hydrogen pipeline, and a hydrogen output port communicated with the mixing assembly is formed in the other end of the hydrogen pipeline; the mixing assembly comprises a static mixer, the input end of the static mixer is provided with a first input pipeline communicated with the natural gas pipeline and a second input pipeline communicated with the hydrogen pipeline, and the output end of the static mixer is provided with an output pipeline used for outputting mixed gas.

Description

Technical Field

[0001] The present invention relates to the field of natural gas, and particularly to a mixing system for natural gas and hydrogen. Background Art

[0002] Adding hydrogen to natural gas can form a new type of fuel. This new type of fuel combines the advantages of natural gas and hydrogen, has a fast combustion speed, lower carbon emissions, and is more environmentally friendly, which is a new way to cope with the oil crisis. Hydrogen has a small compression ratio and is not easily liquefied, resulting in high transportation costs for automobiles and poor promotion economy. In the prior art, hydrogen is usually transported together with natural gas through long-distance pipelines, which greatly reduces the transportation cost of hydrogen and becomes an excellent method for promoting hydrogen and natural gas. However, hydrogen is more prone to explosion than natural gas and has a certain impact on pipe materials.

[0003] To solve the above problems, a patent document with the patent number 202011634609.6 discloses a device for mixing hydrogen and natural gas in a pipeline, including a control module and a gas mixing module; the control module includes a natural gas circulation pipeline I, a hydrogen circulation pipeline II, a PLC controller, a natural gas return route III, and a hydrogen return route IV; on the natural gas circulation pipeline I, a natural gas distribution tank, a first natural gas cut-off device, a natural gas pressure sensor, a natural gas flow rate sensor, a second natural gas cut-off device, and a natural gas one-way transport valve are sequentially arranged, and on the hydrogen circulation pipeline II, a hydrogen distribution tank, a first hydrogen cut-off device, a hydrogen pressure sensor, a hydrogen flow rate sensor, a second hydrogen cut-off device, and a hydrogen one-way transport valve are sequentially arranged; the components on the natural gas circulation pipeline I and the hydrogen circulation pipeline II are connected to the PLC controller and controlled by it.

[0004] The above technical solution can improve the uniformity of the mixed gas and the efficiency of gas mixing. However, in the above technical solution, only a natural gas and hydrogen flow regulating device is provided at the front end of the mixing device, and there is a lack of a necessary secondary confirmation feedback adjustment device after the natural gas and hydrogen are mixed. Summary of the Invention

[0005] The purpose of the present invention is to provide a mixing system for natural gas and hydrogen to solve the problems existing in the prior art.

[0006] The above technical purpose of the present invention is achieved through the following technical solutions:

[0007] A mixing system for natural gas and hydrogen includes a natural gas pressure stabilizing component, a hydrogen pressure regulating component, and a mixing component;

[0008] The natural gas pressure stabilizing component includes a natural gas pipeline. One end of the natural gas pipeline is provided with a natural gas input port. A pressure stabilizing unit is provided on the natural gas pipeline. The other end of the natural gas pipeline is provided with a natural gas output port communicating with the mixing component.

[0009] The hydrogen pressure regulating component includes a hydrogen pipeline. One end of the hydrogen pipeline is provided with a hydrogen input port. A pressure regulating unit is provided on the hydrogen pipeline. The other end of the hydrogen pipeline is provided with a hydrogen output port communicating with the mixing component.

[0010] The mixing component includes a static mixer. The input end of the static mixer is provided with a first input pipeline communicating with the natural gas pipeline and a second input pipeline communicating with the hydrogen pipeline. The output end of the static mixer is provided with an output pipeline for outputting the mixed gas.

[0011] Further, the pressure stabilizing unit includes a main pipeline and a pressure stabilizing pipeline along the natural gas pipeline.

[0012] A first ball valve, a first pneumatic ball valve, a first pressure regulating valve and a second ball valve are sequentially provided on the main pipeline. A third ball valve is provided on the pressure stabilizing pipeline.

[0013] A first pressure transmitter and a first pressure gauge are provided at the rear ends of the main pipeline and the pressure stabilizing pipeline.

[0014] Further, the other end of the natural gas pipeline is provided with a first branch and a second branch.

[0015] The first branch is used to directly output natural gas. An output ball valve and an output check valve are provided on the first branch. The second branch communicates with the first input pipeline of the mixing component.

[0016] Further, a second pneumatic ball valve, a second pressure transmitter, a first thermometer and a first temperature transmitter are sequentially provided at the hydrogen inlet end of the hydrogen pipeline.

[0017] A first pressure regulating unit and a second pressure regulating unit are provided in parallel between the hydrogen input port and the hydrogen output port of the hydrogen pipeline. Both the first pressure regulating unit and the second pressure regulating unit include a fourth ball valve, a filter, a second pressure gauge, a self-operated split pressure reducing valve, a third pressure transmitter and a fifth ball valve sequentially arranged along the pipeline.

[0018] Further, both the first input pipeline and the second input pipeline include an input main pipeline and an adjustment pipeline arranged in parallel. One ends of the input main pipeline and the adjustment pipeline are used to introduce natural gas or hydrogen. The other ends of the input main pipeline and the adjustment pipeline are communicated with the static mixer through a second check valve.

[0019] A sixth ball valve, a flow transmitter, a fourth pressure transmitter, a second temperature transmitter, a second pressure regulating valve, and a seventh ball valve are sequentially provided on the input main pipeline; an eighth ball valve is provided on the regulating pipeline;

[0020] A third pressure gauge is provided at the ends of the input main pipeline and the regulating pipeline.

[0021] Further, a fourth pressure gauge, a second thermometer, a third temperature transmitter, a fifth pressure transmitter, and a hydrogen analyzer are sequentially provided on the output pipeline. The gas outlet end of the output pipeline is connected to the first branch through a ninth ball valve and a third one-way valve.

[0022] In summary, the present invention has the following beneficial effects:

[0023] The flow rates of the two gas streams (standard state flow rates after temperature and pressure compensation) are detected by the natural gas flowmeter and the hydrogen flowmeter respectively. At the same time, a flow regulating valve is provided on the natural gas pipeline to adjust the load. The hydrogen flow is adjusted following the natural gas flow. A hydrogen analyzer is provided at the end of the mixing component to detect the hydrogen content in the mixed gas and adjust the hydrogen flow according to the hydrogen content. When the hydrogen analyzer detects that the hydrogen content exceeds the limit, the control system issues a signal to cut off the hydrogen pipeline cut-off valve to ensure production safety. Description of the Drawings

[0024] Figure 1 is a schematic diagram of the natural gas and hydrogen mixing system of the present invention.

[0025] Figure 2 is a schematic diagram of the natural gas pressure stabilizing component of the present invention.

[0026] Figure 3 is a schematic diagram of the first branch and the second branch of the present invention.

[0027] Figure 4 is a schematic diagram of the hydrogen pressure regulating component of the present invention.

[0028] Figure 5 is a schematic diagram of the mixing component of the present invention. Detailed Embodiments

[0029] In order to make the technical means, creative features, achieved purposes, and effects of the present invention easy to understand, the present invention will be further described below in conjunction with the drawings and specific embodiments.

[0030] As Figures 1 to 5 shown, a natural gas and hydrogen mixing system proposed by the present invention includes a natural gas pressure stabilizing component 1, a hydrogen pressure regulating component 2, and a mixing component 3;

[0031] The natural gas pressure stabilizing assembly 1 includes a natural gas pipeline 11. One end of the natural gas pipeline 11 is provided with a natural gas input port 12. A pressure stabilizing unit 13 is provided on the natural gas pipeline 11. The other end of the natural gas pipeline 11 is provided with a natural gas output port 14 communicating with the mixing assembly 3.

[0032] The hydrogen pressure regulating assembly 2 includes a hydrogen pipeline 21. One end of the hydrogen pipeline 21 is provided with a hydrogen input port 22. A pressure regulating unit 23 is provided on the hydrogen pipeline 21. The other end of the hydrogen pipeline 21 is provided with a hydrogen output port 24 communicating with the mixing assembly 3.

[0033] The mixing assembly 3 includes a static mixer 31. The input end of the static mixer 31 is provided with a first input pipeline 32 communicating with the natural gas pipeline 11 and a second input pipeline 33 communicating with the hydrogen pipeline 21. The output end of the static mixer 31 is provided with an output pipeline 34 for outputting the mixed gas.

[0034] The pressure stabilizing unit 13 includes a main pipeline and a pressure stabilizing pipeline along the natural gas pipeline 11.

[0035] A first ball valve 131, a first pneumatic ball valve 132, a first pressure regulating valve 133 and a second ball valve 134 are sequentially provided on the main pipeline. A third ball valve 135 is provided on the pressure stabilizing pipeline.

[0036] A first pressure transmitter 136 and a first pressure gauge 137 are provided at the rear ends of the main pipeline and the pressure stabilizing pipeline.

[0037] The other end of the natural gas pipeline 11 is provided with a first branch 101 and a second branch 102.

[0038] The first branch 101 is used to directly output natural gas. An output ball valve 103 and an output check valve 104 are provided on the first branch 101. The second branch 102 communicates with the first input pipeline 32 of the mixing assembly 3.

[0039] A second pneumatic ball valve 25, a second pressure transmitter 26, a first thermometer 27 and a first temperature transmitter 28 are sequentially provided at the hydrogen inlet end of the hydrogen pipeline 21.

[0040] A first pressure regulating unit and a second pressure regulating unit are provided in parallel between the hydrogen input port 22 and the hydrogen output port 24 of the hydrogen pipeline 21. Both the first pressure regulating unit and the second pressure regulating unit include a fourth ball valve 201, a filter 202, a second pressure gauge 203, a self-operated split type pressure reducing valve 204, a third pressure transmitter 205 and a fifth ball valve 206 arranged in sequence along the pipeline.

[0041] The first input pipeline 32 and the second input pipeline 33 both include an input main pipeline and a regulating pipeline arranged in parallel; one end of the input main pipeline and the regulating pipeline is used to introduce natural gas or hydrogen, and the other end of the input main pipeline and the regulating pipeline is connected to the static mixer 31 through a second one-way valve 307;

[0042] A sixth ball valve 301, a flow transmitter 302, a fourth pressure transmitter 303, a second temperature transmitter 304, a second pressure regulating valve 305 and a seventh ball valve 306 are sequentially arranged on the input main pipeline; an eighth ball valve 308 is arranged on the regulating pipeline;

[0043] A third pressure gauge 309 is provided at the ends of the input main pipeline and the regulating pipeline.

[0044] A fourth pressure gauge 401, a second thermometer 402, a third temperature transmitter 403, a fifth pressure transmitter 404 and a hydrogen analyzer 405 are sequentially arranged on the output pipeline 34, and the gas outlet end of the output pipeline 34 is connected to the first branch 101 through a ninth ball valve 406 and a third one-way valve 407.

[0045] The working principle of the present invention is as follows:

[0046] The flow rates of the two gases (standard state flow rates after temperature and pressure compensation) are respectively detected by a natural gas flow meter and a hydrogen flow meter. At the same time, a flow regulating valve is arranged on the natural gas pipeline to adjust the load. The hydrogen flow is adjusted following the natural gas flow. A hydrogen analyzer is arranged at the end where the blending component is provided to detect the hydrogen content in the mixed gas and adjust the hydrogen flow according to the hydrogen content. When the hydrogen analyzer detects that the hydrogen content exceeds the limit, the control system issues a signal to cut off the hydrogen pipeline cut-off valve to ensure production safety.

[0047] In this article, the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only for the sake of clear expression of the technical solution and convenient description, so it cannot be understood as a limitation to the present invention.

[0048] In this article, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, including not only those listed elements, but also other elements not expressly listed.

[0049] The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, various changes and improvements will occur to the present invention, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A blending system for natural gas and hydrogen, characterized in that It includes a natural gas pressure stabilizing component (1), a hydrogen pressure regulating component (2), and a blending component (3); The natural gas pressure stabilizing component (1) includes a natural gas pipeline (11). One end of the natural gas pipeline (11) is provided with a natural gas input port (12). A pressure stabilizing unit (13) is provided on the natural gas pipeline (11). The other end of the natural gas pipeline (11) is provided with a natural gas output port (14) communicating with the blending component (3); The hydrogen pressure regulating component (2) includes a hydrogen pipeline (21). One end of the hydrogen pipeline (21) is provided with a hydrogen input port (22). A pressure regulating unit (23) is provided on the hydrogen pipeline (21). The other end of the hydrogen pipeline (21) is provided with a hydrogen output port (24) communicating with the blending component (3); The blending component (3) includes a static mixer (31). The input end of the static mixer (31) is provided with a first input pipeline (32) communicating with the natural gas pipeline (11) and a second input pipeline (33) communicating with the hydrogen pipeline (21). The output end of the static mixer (31) is provided with an output pipeline (34) for outputting the mixed gas.

2. The blending system for natural gas and hydrogen according to claim 1, characterized in that, The pressure stabilizing unit (13) includes a main pipeline and a pressure stabilizing pipeline along the natural gas pipeline (11); A first ball valve (131), a first pneumatic ball valve (132), a first pressure regulating valve (133), and a second ball valve (134) are successively provided on the main pipeline. A third ball valve (135) is provided on the pressure stabilizing pipeline; A first pressure transmitter (136) and a first pressure gauge (137) are provided at the rear ends of the main pipeline and the pressure stabilizing pipeline.

3. The blending system for natural gas and hydrogen according to claim 1, characterized in that The other end of the natural gas pipeline (11) is provided with a first branch (101) and a second branch (102); The first branch (101) is used to directly output natural gas. An output ball valve (103) and an output check valve (104) are provided on the first branch (101); the second branch (102) communicates with the first input pipeline (32) of the blending component (3).

4. The natural gas and hydrogen blending system according to claim 1, wherein A second pneumatic ball valve (25), a second pressure transmitter (26), a first thermometer (27), and a first temperature transmitter (28) are successively provided at the hydrogen inlet end of the hydrogen pipeline (21); A first pressure regulating unit and a second pressure regulating unit are provided in parallel between the hydrogen input port (22) and the hydrogen output port (24) of the hydrogen pipeline (21). Both the first pressure regulating unit and the second pressure regulating unit include a fourth ball valve (201), a filter (202), a second pressure gauge (203), a self-operated split type pressure reducing valve (204), a third pressure transmitter (205), and a fifth ball valve (206) successively arranged along the pipeline.

5. The natural gas and hydrogen blending system according to claim 1, characterized in that, Both the first input pipeline (32) and the second input pipeline (33) include an input main pipeline and an adjusting pipeline arranged in parallel; one ends of the input main pipeline and the adjusting pipeline are used to introduce natural gas or hydrogen, and the other ends of the input main pipeline and the adjusting pipeline are communicated with the static mixer (31) through a second check valve (307); A sixth ball valve (301), a flow transmitter (302), a fourth pressure transmitter (303), a second temperature transmitter (304), a second pressure regulating valve (305) and a seventh ball valve (306) are successively arranged on the input main pipeline; an eighth ball valve (308) is arranged on the regulating pipeline; A third pressure gauge (309) is arranged at the ends of the input main pipeline and the regulating pipeline.

6. The blending system for natural gas and hydrogen according to claim 1, wherein A fourth pressure gauge (401), a second thermometer (402), a third temperature transmitter (403), a fifth pressure transmitter (404) and a hydrogen analyzer (405) are successively arranged on the output pipeline (34), and the gas outlet end of the output pipeline (34) is communicated with the first branch (101) through a ninth ball valve (406) and a third one-way valve (407).

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