Natural gas hydrogen doping system

Abstract

The utility model relates to a natural gas hydrogen doping system, and belongs to the field of gas energy. The natural gas pipeline comprises a natural gas conveying pipe, and the natural gas conveying pipe is sequentially connected with a first switch valve, a first temperature sensor, a first pressure regulating valve and a first flow meter in the gas flow direction and then connected with the gas inlet end of the mixer; the hydrogen pipeline comprises a hydrogen pipe, the hydrogen pipe is sequentially connected with a second switch valve, a second pressure regulating valve, a second flowmeter, a flow control valve and a second temperature sensor in the airflow direction and then connected with the gas inlet end of the mixer, and the gas outlet end of the mixer is connected with a mixed gas outlet pipeline; terminal mixing is achieved by arranging the mixer and arranging the flow control valve on the hydrogen pipeline, flow meters are arranged on the natural gas pipeline and the hydrogen pipeline in a matched mode, the mixing proportion of hydrogen and natural gas is controlled through the flow meters and the flow control valve, a terminal user can conveniently adjust the mixing proportion at any time according to needs, and various requirements of the user are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to a gas energy field especially relates to a natural gas hydrogen blending system. BACKGROUND

[0002] The delivery of hydrogen has been a problem restricting the development of hydrogen energy industry chain, compared, pure hydrogen pipeline delivery, natural gas pipeline hydrogen blending delivery can realize long-distance, large-scale, low-energy consumption transportation of hydrogen energy, but pure hydrogen pipeline construction in China is not mature, large-scale hydrogen delivery needs a long period. Natural gas hydrogen blending delivery not only can utilize the natural gas pipeline in use for delivery, can realize the purpose of safe, efficient, large-scale and long-distance hydrogen delivery to the end user, and natural gas hydrogen blending can also reduce carbon emission standard, therefore, natural gas suppliers will blend hydrogen in natural gas for this purpose in some cases. At present, many natural gas hydrogen blending delivery demonstration projects have been carried out at home and abroad, however, the current natural gas hydrogen blending delivery system is mixed in the intermediate station and then delivered to the terminal by the delivery pipe, the user cannot adjust the mixing ratio according to the need, and cannot meet the various needs of the user. SUMMARY

[0003] The existing natural gas hydrogen blending system is mixed in the intermediate station and then delivered to the terminal by the delivery pipe, the user cannot adjust the mixing ratio according to the need, and cannot meet the various needs of the user, at least one aspect or one purpose of the present application can solve the above problems, a natural gas hydrogen blending system is specifically designed, which adopts the technical scheme of:

[0004] A natural gas hydrogen blending system, comprising:

[0005] A protective shell;

[0006] A natural gas pipeline is arranged in the protective shell and comprises: a natural gas delivery pipe, the natural gas delivery pipe is connected with the gas inlet end of a mixer in sequence along the gas flow direction after being connected with a first switch valve, a first temperature sensor, a first pressure regulating valve and a first flow meter.

[0007] A hydrogen pipeline is arranged in the protective shell and comprises: a hydrogen pipe, the hydrogen pipe is connected with the gas inlet end of the mixer in sequence along the gas flow direction after being connected with a second switch valve, a second pressure regulating valve, a second flow meter, a flow control valve and a second temperature sensor, and the gas outlet end of the mixer is connected with a mixed gas outlet pipeline.

[0008] Preferably, the first pressure sensor and the second pressure sensor are arranged on the natural gas delivery pipe corresponding to the two sides of the first pressure regulating valve, the first pressure sensor is arranged close to the inlet side of the natural gas delivery pipe, and the second pressure sensor is arranged close to the side of the mixer.

[0009] Preferably, a first filter is arranged on the natural gas conveying pipe at the side of the first pressure sensor, the first filter is arranged at the side close to the inlet of the natural gas conveying pipe, a first check valve is further connected to the natural gas conveying pipe between the first flow meter and the second pressure sensor, and a first safety valve is further arranged between the first check valve and the first flow meter.

[0010] Preferably, a first nitrogen purge pipe is further connected to the natural gas pipeline, and the inlet of the first nitrogen purge pipe is connected to the natural gas conveying pipe between the first switch valve and the first pressure regulating valve.

[0011] Preferably, the first nitrogen purge pipe is sequentially provided with a first nitrogen switch valve and a first nitrogen check valve along the gas flow direction.

[0012] Preferably, a third pressure sensor and a fourth pressure sensor are arranged on the hydrogen pipe at the two sides of the second pressure regulating valve, the third pressure sensor is arranged at the side close to the inlet of the hydrogen pipe, and the fourth pressure sensor is arranged at the side close to the flow control valve.

[0013] Preferably, a third temperature sensor is further arranged on the hydrogen pipe at the side of the third pressure sensor, the third temperature sensor is arranged at the side close to the second pressure regulating valve, a second filter and a second check valve are arranged on the hydrogen pipe at the side of the third pressure sensor, the second check valve and the second filter are sequentially arranged along the flow direction of the hydrogen pipe, and a second safety valve is further connected to the hydrogen pipe between the second flow meter and the fourth pressure sensor.

[0014] Preferably, a second nitrogen purge pipe is further connected to the hydrogen pipeline, and the second nitrogen purge pipe is connected to the inlet of the hydrogen pipe.

[0015] Preferably, a second nitrogen switch valve and a second nitrogen check valve are sequentially arranged on the second nitrogen purge pipe along the gas flow direction.

[0016] Preferably, a fifth pressure sensor and a fourth temperature sensor are connected to the mixed gas pipeline.

[0017] The utility model discloses a flow control valve is arranged on the hydrogen pipeline, and the flow meter is arranged on the natural gas pipeline and the hydrogen pipeline, the mixed proportion of hydrogen and natural gas is controlled through the flow meter and the flow control valve, the flow control valve is arranged in the terminal, and the mixed proportion is adjusted at any time according to the need of the terminal user through the terminal mixing, and the multiple needs of the user are satisfied. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the principle drawing of the system;

[0019] Figure 2 It is the front view of the mixer.

[0020] In the figure, 1, protective shell, 2, natural gas pipeline, 3, first nitrogen purge pipeline, 4, hydrogen pipeline, 5, second nitrogen purge pipeline, 6, mixer, 7, mixed gas outlet pipeline, 8, fifth pressure sensor, 9, fourth temperature sensor.

[0021] 201, first switch valve, 202, first filter, 203, first pressure sensor, 204, first temperature sensor, 205, first pressure regulating valve, 206, first flow meter, 207, first check valve, 208, second pressure sensor, 209, first safety valve;

[0022] 301, first nitrogen switch valve, 302, first nitrogen check valve;

[0023] 401, second switch valve, 402, second check valve, 403, second filter, 404, third pressure sensor, 405, third temperature sensor, 406, second pressure regulating valve, 407, second flow meter, 408, fourth pressure sensor, 409, flow control valve, 410, second temperature sensor, 411, second safety valve;

[0024] 501, second nitrogen switch valve, 502, second nitrogen check valve. DETAILED DESCRIPTION

[0025] In order to clearly illustrate the technical features of the present application, the present application will be described in detail below with specific embodiments and in conjunction with the accompanying drawings.

[0026] In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0027] As shown in Figures 1-2 A natural gas hydrogen blending system, comprising a protective shell 1, the protective shell 1 is integrated with a natural gas pipeline 2, a mixer 6 and a hydrogen pipeline 4, the natural gas pipeline 2 and the hydrogen pipeline 4 are connected with the inlet of the mixer 6 respectively, and after mixing in the mixer 6, the mixed gas is transported to the end user by a mixed gas outlet pipeline 7.

[0028] The above-mentioned mixer 6 is realized by using the existing structure, which is essentially a Venturi tube. Hydrogen and natural gas are mixed and accelerated in the Venturi tube and then discharged. The specific structure is shown in Figure 2 .

[0029] The natural gas pipeline 2 includes a natural gas delivery pipe, the inlet of which is connected to an external natural gas delivery pipe network, and the natural gas delivery pipe is connected in sequence along the gas flow direction to a first switch valve 201, a first temperature sensor 204, a first pressure regulating valve 205, a first flow meter 206, and then to the gas inlet end of the mixer 6. The first switch valve 201 is used to control the on-off of the natural gas delivery pipe. In an actual hydrogen blending system, the first switch valve 201 can include multiple switch valves, such as a series of manual ball valves and pneumatic ball valves. The pneumatic ball valves can be automatically opened and closed to achieve automatic control, while the manual ball valves can be used to control the on-off of the entire pipeline during pipeline maintenance. The first temperature sensor 204 can detect the temperature of the natural gas and output temperature and display temperature data. The first pressure regulating valve 205 reduces the pressure of the natural gas from 4 MPa to 0.4 MPa, and the reduced pressure natural gas improves the safety of the natural gas delivery pipe. The first flow meter 206 detects the flow of the natural gas delivery pipe, so the flow of the natural gas entering the mixer 6 can be known.

[0030] The hydrogen pipeline 4 includes a hydrogen pipe, the inlet of which is connected to an external hydrogen tank truck, and the hydrogen pipe is connected in sequence along the gas flow direction to a second switch valve 401, a second pressure regulating valve 406, a second flow meter 407, a flow control valve 409, a second temperature sensor 410, and then to the gas inlet end of the mixer 6, and the gas outlet end of the mixer 6 is connected to a mixed gas outlet pipeline 7. The second switch valve 401 can also include multiple switch valves, such as a series of manual ball valves and pneumatic ball valves. The pneumatic ball valves are mainly used for automatic control, and the manual ball valves can be used to control the on-off of the entire pipeline during pipeline maintenance. The second pressure regulating valve 406 can reduce the pressure of the hydrogen in the hydrogen pipe from 20 MPa to 0.5 MPa, and then the flow of the hydrogen pipe is detected by the second flow meter 407. According to the required mixing ratio, the flow control valve 409 is adjusted to control the flow of the hydrogen, and then the user can adjust it according to their own requirements, which is convenient for the user's various needs. The second temperature sensor 410 can detect the temperature of the hydrogen in the hydrogen pipe.

[0031] It should be noted that each component connected to the natural gas delivery pipe and each component connected to the hydrogen pipe are electrically connected to an external controller, which is controlled by the controller.

[0032] Further, the first pressure sensor 203 and the second pressure sensor 208 are arranged on the natural gas conveying pipe corresponding to the two sides of the first pressure regulating valve 205. The first pressure sensor 203 is arranged near the side of the natural gas conveying pipe inlet, and the second pressure sensor 208 is arranged near the side of the mixer 6. The first pressure sensor 203 detects the pressure before the first pressure regulating valve 205 is regulated, and the second pressure sensor 208 detects the pressure after the first pressure regulating valve 205 is regulated. Whether the pressure after the first pressure regulating valve 205 is regulated reaches the requirement is detected by the second pressure sensor 208.

[0033] Further, the first filter 202 is arranged on the natural gas conveying pipe on the side of the first pressure sensor 203. The first filter 202 is arranged near the side of the natural gas conveying pipe inlet. The first filter 202 can filter the impurities of the entering natural gas, so that the natural gas is more clean. The first one-way valve 207 is further connected to the natural gas conveying pipe between the first flow meter 206 and the second pressure sensor 208. The first one-way valve 207 can prevent backflow. The first safety valve 209 is further arranged between the first one-way valve 207 and the first flow meter 206. The first safety valve 209 ensures the safe conveying of the natural gas.

[0034] Further, in order to empty the air in the pipeline before conveying the natural gas, the first nitrogen purging pipeline 3 is further connected to the natural gas pipeline 2. The first nitrogen purging pipeline 3 cleans the pipeline, so as to avoid that the air in the pipeline participates in the reaction or causes inaccurate or explosion problems. Specifically, the inlet of the first nitrogen purging pipeline 3 is connected to the natural gas conveying pipe between the first switch valve 201 and the first pressure regulating valve 205. In this way, the nitrogen in the first nitrogen purging pipeline 3 can pass through the entire natural gas pipeline 2, so as to realize that the nitrogen empties the air in the entire natural gas pipeline 2, and reduces the residual air in the pipeline.

[0035] Further, the first nitrogen switch valve 301 and the first nitrogen one-way valve 302 are arranged on the first nitrogen purging pipeline 3 in sequence along the air flow direction. The first nitrogen switch valve 301 is mainly a manual switch valve. Because it is not frequently used, the manual switch valve can meet the requirement. The first nitrogen one-way valve 302 can avoid the backflow of the nitrogen.

[0036] Further, the third pressure sensor 404 and the fourth pressure sensor 408 are arranged on the hydrogen pipe corresponding to the two sides of the second pressure regulating valve 406 in the above hydrogen pipeline 4. The third pressure sensor 404 is arranged near the side of the hydrogen pipe inlet, and the fourth pressure sensor 408 is arranged near the side of the flow control valve 409. The third pressure sensor 404 is used to detect the pressure before the second pressure regulating valve 406 is regulated, and the fourth pressure sensor 408 is used to detect the pressure after the second pressure regulating valve 406 is regulated. Whether the pressure after the second pressure regulating valve 406 is regulated reaches the requirement can be known.

[0037] Further, the hydrogen pipe on the side of the third pressure sensor 404 is further provided with a third temperature sensor 405, the third temperature sensor 405 is arranged close to the side of the second pressure regulating valve 406, the third temperature sensor 405 can detect the temperature of hydrogen before pressure reduction, and it cooperates with the second temperature sensor 410 to detect the temperature before and after the second pressure regulating valve 406. The hydrogen pipe on the other side of the third pressure sensor 404 is provided with a second filter 403 for filtering impurities in hydrogen, and a second check valve 402 for controlling hydrogen backflow, the second filter 403 and the second check valve 402 are sequentially arranged along the flow direction of the hydrogen pipe, and the hydrogen pipe between the second flow meter 407 and the fourth pressure sensor 408 is further connected with a second safety valve 411, which ensures safe hydrogen delivery.

[0038] Further, in order to empty the air in the pipeline before delivering hydrogen, a second nitrogen purging pipeline 5 is generally connected to the hydrogen pipeline 4, the second nitrogen purging pipeline 5 is connected to the inlet of the hydrogen pipe, so as to empty the air in the entire hydrogen pipeline 4 and reduce the residual air in the pipe.

[0039] Further, the second nitrogen purging pipeline 5 is sequentially provided with a second nitrogen on-off valve 501 and a second nitrogen check valve 502 along the flow direction, the second nitrogen on-off valve 501 is mainly a manual on-off valve, and the second nitrogen check valve 502 can prevent nitrogen backflow.

[0040] Further, in order to detect the output pressure and temperature of the mixed natural gas and hydrogen, a fifth pressure sensor 8 and a fourth temperature sensor 9 are connected to the mixed gas outlet pipeline 7.

[0041] The above specific embodiments cannot be regarded as a limitation on the protection scope of the present application, and any alternative improvement or change made by the person skilled in the art to the embodiments of the present application falls within the protection scope of the present application.

[0042] The details not described in the present application are the known technology of the person skilled in the art.

Claims

1. A natural gas hydrogen blending system characterized by, The utility model relates to a kind of hydrogen-natural gas mixing device, including: Protective shell; Natural gas pipeline, be arranged in the protective shell, including: natural gas delivery pipe, the natural gas delivery pipe is sequentially connected with the first switch valve, first temperature sensor, first pressure regulating valve, first flowmeter along the direction of airflow and with the gas inlet of mixer connects; Hydrogen pipeline, be arranged in the protective shell, including: hydrogen pipe, the hydrogen pipe is sequentially connected with the second switch valve, second pressure regulating valve, second flowmeter, flow control valve, second temperature sensor along the direction of airflow and with the gas inlet of the mixer connects, and the gas outlet of the mixer is connected with mixed gas outlet pipeline.

2. A hydrogen-blended natural gas system as in claim 1, wherein, Corresponding the first pressure regulating valve two sides on the natural gas delivery pipe, corresponding first pressure sensor and second pressure sensor are equipped, the first pressure sensor is close to the side of natural gas delivery pipe entrance and is arranged, and the second pressure sensor is close to the side of the mixer and is arranged.

3. A hydrogen-enriched natural gas system according to claim 2, wherein First filter is equipped on the natural gas delivery pipe of the side of the first pressure sensor, and the first filter is arranged on the side close to natural gas delivery pipe entrance, and first check valve is also connected on the natural gas delivery pipe between the first flowmeter and the second pressure sensor, and first safety valve is also equipped between the first check valve and the first flowmeter.

4. A hydrogen-enriched natural gas system according to claim 1 or 2 or 3, characterized in that First nitrogen purge pipeline is also connected on the natural gas pipeline, and the inlet of the first nitrogen purge pipeline is connected on the natural gas delivery pipe between the first switch valve and the first pressure regulating valve.

5. A hydrogen-enriched natural gas system according to claim 4, wherein First nitrogen switch valve and first nitrogen check valve are sequentially arranged on the first nitrogen purge pipeline along the direction of airflow.

6. The hydrogen-blend natural gas system of claim 1, wherein, Corresponding the second pressure regulating valve two sides on the hydrogen pipe, corresponding third pressure sensor and fourth pressure sensor are equipped, the third pressure sensor is close to the side of hydrogen pipe entrance and is arranged, and the fourth pressure sensor is close to the side of flow control valve and is arranged.

7. A hydrogen-enriched natural gas system according to claim 6, wherein Third temperature sensor is also equipped on the hydrogen pipe of the side of the third pressure sensor, and the third temperature sensor is close to the side of the second pressure regulating valve and is arranged, second filter and second check valve are equipped on the hydrogen pipe of the side of the third pressure sensor, and the second check valve and the second filter are sequentially arranged along the flow direction of the hydrogen pipe, and second safety valve is also connected on the hydrogen pipe between the second flowmeter and the fourth pressure sensor.

8. A hydrogen-enriched natural gas system according to claim 7, wherein Second nitrogen purge pipeline is also connected on the hydrogen pipeline, and the second nitrogen purge pipeline is connected with the inlet of the hydrogen pipe.

9. A hydrogen-enriched natural gas system according to claim 8, wherein Second nitrogen switch valve and second nitrogen check valve are sequentially arranged on the second nitrogen purge pipeline along the direction of airflow.

10. The hydrogen-enriched natural gas system of claim 1, wherein, Fifth pressure sensor and fourth temperature sensor are connected on the mixed gas outlet pipeline.

Images