Stable hydrogen delivery system

Abstract

The utility model relates to the technical field of hydrogen conveying, in particular to a stable hydrogen delivery system. The multiple hydrogen conveying pipelines are arranged, hydrogen is correspondingly conveyed to the hydrogen conveying pipelines through the hydrogen distribution table, the first-stage pressure stabilizing assembly and the second-stage pressure stabilizing assembly are controlled through the DCS to conduct first-stage pressure stabilizing and second-stage pressure stabilizing, and therefore the hydrogen pressure in the hydrogen conveying pipelines is controlled; the hydrogen is uniformly conveyed to the large-flow delivery pipeline and the small-flow delivery pipeline through the delivery hydrogen main pipe, and the three-stage pressure stabilizing assemblies are arranged on the delivery hydrogen main pipe and the large-flow delivery pipeline for three-stage pressure stabilization, so that part of hydrogen is stably conveyed to a user with high hydrogen demand through the large-flow delivery pipeline; part of hydrogen is stably conveyed to a user with a small hydrogen demand through the small-flow delivery pipeline, and the pressure of hydrogen in the hydrogen conveying pipeline, the delivery hydrogen main pipe and the large-flow delivery pipeline is gradually reduced by setting a gradually-reduced pressure threshold value, so that stable delivery of hydrogen is controlled.

Description

TECHNICAL FIELD

[0001] The application relates to the hydrogen delivery technical field, in particular to a hydrogen stable delivery system. BACKGROUND

[0002] Hydrogen energy is a kind of secondary energy with abundant source, green and low carbon and wide application, at present, a large amount of hydrogen by-product is discharged in the chlor-alkali industry electrolysis, and the hydrogen as a kind of clean high-heat energy is directly discharged, which is a serious waste of resources. Through the preliminary investigation and communication, the hydrogen can be directly used for boiler blending, fuel cell power generation, steam production, pressurized filling and the like; the main equipment for producing hydrogen in the chlor-alkali industry is an ion exchange membrane electrolytic cell, and the unstable hydrogen delivery pressure will lead to the fluctuation of the chlorine-hydrogen pressure difference, and further damage the ion exchange membrane; meanwhile, part of the hydrogen in the chlor-alkali industry is used for synthesizing hydrogen chloride, and the production of hydrogen chloride requires that the ratio of hydrogen to chlorine is 1.05-1.1:1, therefore, how to control the stable hydrogen delivery is a technical problem to be solved by the person skilled in the art; the existing pressure stabilizing method mostly controls the hydrogen pressure in the pipeline behind the valve through the pressure regulating valve, when the pressure regulating valve fails, the hydrogen is in an uncontrolled state in a short time, which will cause the damage of the ion exchange membrane, and even affect the production. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at solving the above-mentioned problem, and provides a delivery system capable of stably delivering hydrogen.

[0004] The utility model solves the problem by adopting the technical scheme of:

[0005] A hydrogen stable delivery system, comprising a plurality of hydrogen delivery pipelines, a hydrogen delivery main pipeline, a large-flow delivery pipeline and a small-flow delivery pipeline, the hydrogen delivery pipelines are communicated to the front end of the hydrogen delivery main pipeline, and the large-flow delivery pipeline and the small-flow delivery pipeline are respectively communicated to the rear end of the hydrogen delivery main pipeline; the input end of each hydrogen delivery pipeline is provided with a hydrogen distribution platform, a first-stage pressure stabilizing assembly is arranged on the front end of each hydrogen delivery pipeline and the hydrogen distribution platform, a second-stage pressure stabilizing assembly is arranged at the rear end of each hydrogen delivery pipeline, a third-stage pressure stabilizing assembly is arranged on the hydrogen delivery main pipeline and the large-flow delivery pipeline, and a flow stabilizing assembly is arranged on the small-flow delivery pipeline; the first-stage pressure stabilizing assembly, the second-stage pressure stabilizing assembly, the third-stage pressure stabilizing assembly and the flow stabilizing assembly are connected with a DCS system, and gradually reduced pressure thresholds are arranged in the DCS system corresponding to the first-stage pressure stabilizing assembly, the second-stage pressure stabilizing assembly and the third-stage pressure stabilizing assembly.

[0006] The utility model adopting the above technical scheme has the beneficial effects compared with the prior art:

[0007] The utility model discloses a plurality of hydrogen delivery pipelines are arranged, and hydrogen is correspondingly delivered to the hydrogen delivery pipeline through the hydrogen distribution platform, one -stage pressure stabilizing component and two -stage pressure stabilizing component are arranged on the hydrogen delivery pipeline, and the switch or the opening of one -stage pressure stabilizing component and two -stage pressure stabilizing component is controlled through DCS system, and one -stage pressure stabilizing and two -stage pressure stabilizing are carried out, thereby the hydrogen pressure in the hydrogen delivery pipeline is controlled, hydrogen is stably delivered in the hydrogen delivery pipeline, a plurality of hydrogen delivery pipelines are communicated to the main pipe of external hydrogen delivery, are delivered to the large -flow external delivery pipeline and the small -flow external delivery pipeline through the main pipe of external hydrogen delivery unification, and three -stage pressure stabilizing component is arranged on the main pipe of external hydrogen delivery and the large -flow external delivery pipeline, and three -stage pressure stabilizing is carried out, and part hydrogen is stably delivered to the user of hydrogen demand larger through the large -flow external delivery pipeline, and the flow stabilizing component is arranged on the small -flow external delivery pipeline, and part hydrogen is stably delivered to the user of hydrogen demand smaller through the small -flow external delivery pipeline, and through setting gradually reducing pressure threshold, the hydrogen pressure in the hydrogen delivery pipeline, the main pipe of external hydrogen delivery and the large -flow external delivery pipeline gradually reduces, thereby hydrogen is stably delivered.

[0008] As preferred, the utility model further provides a technical scheme:

[0009] The first pressure gauge is used for detecting the internal pressure of the hydrogen distribution platform, one end of the first venting pipeline is communicated with the hydrogen distribution platform, the other end of the first venting pipeline is used for emptying, and the first venting valve is arranged on the first venting pipeline. The first pressure gauge, the first pressure regulating valve and the first venting valve are connected with the DCS system respectively. The internal pressure of the hydrogen distribution platform is detected through the first pressure gauge. When the pressure value detected by the first pressure gauge received by the DCS system exceeds the pressure threshold, the first venting valve is controlled to open, and the hydrogen is vented through the first venting pipeline, thereby relieving the internal pressure of the hydrogen distribution platform, so that the hydrogen distribution platform stably outputs the hydrogen, and the first pressure regulating valve is used for adjusting the hydrogen pressure output by the hydrogen distribution platform.

[0010] The second pressure gauge is arranged on the hydrogen delivery pipeline at the rear end of the first pressure regulating valve, the input end of the second venting pipeline is communicated with the hydrogen delivery pipeline between the first pressure regulating valve and the second pressure gauge, the other end of the second venting pipeline is communicated with the first venting pipeline, the second venting valve is arranged on the second venting pipeline, and the second pressure gauge and the second venting valve are connected with the DCS system respectively. The internal pressure of the hydrogen delivery pipeline from the first pressure regulating valve to the main pipe of external hydrogen delivery is detected through the second pressure gauge. When the pressure value detected by the second pressure gauge received by the DCS system exceeds the pressure threshold, the second venting valve is controlled to open, and the hydrogen is vented through the second venting pipeline and the first venting pipeline, thereby relieving the internal pressure of the pipeline at the front end of the hydrogen delivery pipeline, so that the hydrogen at the rear end of the hydrogen delivery pipeline is stably delivered.

[0011] The three-stage pressure stabilization assembly includes a third pressure gauge, a fourth pressure gauge, a third vent pipe, a third vent valve, and a second pressure regulating valve. The third pressure gauge and the second pressure regulating valve are arranged on the hydrogen delivery main pipe, and the fourth pressure gauge is arranged on the high-flow delivery pipe. One end of the third vent pipe is connected to the high-flow delivery pipe, and the other end of the third vent pipe is connected to the second vent pipe at the rear end of the second vent valve. The third vent valve is arranged on the third vent pipe. The third pressure gauge, the fourth pressure gauge, the third vent valve, and the second pressure regulating valve are respectively connected to the DCS system. The internal pressure of the hydrogen delivery main pipe is detected by the third pressure gauge, and the internal pressure of the high-flow delivery pipe is detected by the fourth pressure gauge. When the internal pressure of the high-flow delivery pipe exceeds a pressure threshold, the third vent valve is controlled to open, and some hydrogen is vented through the third vent pipe and the second vent pipe, thereby alleviating the internal pressure of the high-flow delivery pipe and ensuring stable hydrogen transportation in the high-flow delivery pipe.

[0012] One end of the small flow rate delivery pipeline is connected to the hydrogen delivery main pipe. The small flow rate delivery pipeline is provided with a first flow meter, a flow rate regulating valve and a fifth pressure gauge. The first flow meter, the flow rate regulating valve and the fifth pressure gauge are connected to the DCS system. The hydrogen flow rate in the small flow rate delivery pipeline is detected by the first flow meter, and the internal pressure of the small flow rate delivery pipeline is detected by the fifth pressure gauge. This facilitates the DCS system to control the opening of the flow rate regulating valve according to the above-mentioned detection values, thereby adjusting the internal flow rate and pressure of the small flow rate delivery pipeline to achieve stable hydrogen delivery.

[0013] A second flow meter is also provided at the rear end of the hydrogen main pipe, which is connected to the DCS system. The second flow meter detects the flow rate in the pipeline at the rear end of the hydrogen main pipe and can serve as a backup pressure detection device when the fourth pressure gauge fails.

[0014] The other end of each first vent pipe is connected to a positive water seal, the output end of which is connected to a nitrogen pipeline and a steam pipeline. The nitrogen pipeline is provided with a nitrogen valve, and the steam pipeline is provided with a steam valve. The positive water seal prevents hydrogen from flowing back through the first vent pipe. In the event of a hydrogen fire, the nitrogen and steam valves are opened to suffocate the fire with nitrogen, steam, and hydrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Fig. 1 It is a structural diagram of an embodiment of the present application;

[0016] Fig. 2 This is a schematic diagram of the hydrogen delivery direction of an embodiment of the present application;

[0017] In the figure: 1, first venting pipeline; 2, second venting pipeline; 3, hydrogen conveying pipeline; 4, main hydrogen delivery pipeline; 5, third venting pipeline; 6, large-flow delivery pipeline; 7, small-flow delivery pipeline; 8, steam pipeline; 9, nitrogen pipeline. DETAILED DESCRIPTION

[0018] The utility model will be further explained in combination with examples, the purpose is only in better understanding the utility model content, therefore, the example does not limit the protection scope of the utility model.

[0019] Referring Figs. 1-2 , the application embodiment discloses a hydrogen stable delivery system, including three hydrogen conveying pipeline 3, main hydrogen delivery pipeline 4, large-flow delivery pipeline 7 and small-flow delivery pipeline 6, each hydrogen conveying pipeline 3 is communicated to the front end of main hydrogen delivery pipeline 4, large-flow delivery pipeline 7 and small-flow delivery pipeline 6 are connected respectively at the rear end of main hydrogen delivery pipeline, large-flow delivery pipeline 7 is used to deliver hydrogen to the user with large hydrogen demand, and small-flow delivery pipeline 6 is used to deliver hydrogen to the user with small hydrogen demand;The input end of each hydrogen conveying pipeline 3 is provided with a hydrogen distribution platform, a first pressure stabilizing component is arranged on the front end of each hydrogen conveying pipeline 3 and the hydrogen distribution platform, a second pressure stabilizing component is arranged at the rear end of each hydrogen conveying pipeline 3, a third pressure stabilizing component is arranged on main hydrogen delivery pipeline 4 and large-flow delivery pipeline 7, and a flow stabilizing component is arranged on small-flow delivery pipeline 6, the first pressure stabilizing component, the second pressure stabilizing component and the third pressure stabilizing component are connected with a DCS system, gradually reduced pressure thresholds are arranged in the DCS system corresponding to the first pressure stabilizing component, the second pressure stabilizing component and the third pressure stabilizing component, the DCS system is used to detect the internal pressure of the pipeline through the first pressure stabilizing component, the second pressure stabilizing component and the third pressure stabilizing component, compare the pipeline pressure with the corresponding pressure threshold, control the switch or opening degree of the first pressure stabilizing component, the second pressure stabilizing component and the third pressure stabilizing component, adjust the hydrogen conveying pressure in hydrogen conveying pipeline 3, main hydrogen delivery pipeline 4 and large-flow delivery pipeline 7, thereby stabilizing the pressure.

[0020] In the embodiment, the first pressure stabilizing assembly comprises a first pressure gauge PT1, a first venting pipeline 1, a first venting valve PV1 and a first pressure regulating valve PIC1. The first pressure gauge PT1 is used to detect the internal pressure of the hydrogen distribution station. The input end of the first venting pipeline 1 is connected to the hydrogen distribution station. The output end of the first venting pipeline 1 is used for venting. The first venting valve PV1 is arranged on the first venting pipeline 1. The first pressure regulating valve PIC1 is arranged at the front end of the hydrogen conveying pipeline 3. The first pressure gauge PT1, the first pressure regulating valve PIC1 and the first venting valve PV1 are respectively connected to the DCS system. The first pressure threshold is set in the DCS system. The internal pressure of the hydrogen distribution station is detected by the first pressure gauge PT1. When the pressure value detected by the first pressure gauge PT1 received by the DCS system exceeds the pressure threshold, the first venting valve PV1 is controlled to be opened. The hydrogen is vented through the first venting pipeline 1, so as to relieve the internal pressure of the hydrogen distribution station, to make the hydrogen distribution station stably output hydrogen, and the first pressure regulating valve PIC1 is used to adjust the hydrogen pressure output by the hydrogen distribution station.

[0021] In the embodiment, the second pressure stabilizing assembly comprises a second pressure gauge PT2, a second venting pipeline 2 and a second venting valve PV2. The second pressure gauge PT2 is arranged on the hydrogen conveying pipeline 3 at the rear end of the first pressure regulating valve PIC1. The input end of the second venting pipeline 2 is connected to the hydrogen conveying pipeline 3 between the first pressure regulating valve PIC1 and the second pressure gauge PT2. The output end of the second venting pipeline 2 is connected to the first venting pipeline 1 at the rear end of the first venting valve PV1. The second venting valve PV2 is arranged on the second venting pipeline 2. The second pressure gauge PT2 and the second venting valve PV2 are respectively connected to the DCS system. The second pressure threshold is set in the DCS system. The internal pressure of the hydrogen conveying pipeline 3 between the lower opening of the first pressure regulating valve PIC1 and the main hydrogen conveying pipeline 4 is detected by the second pressure gauge PT2. When the pressure value detected by the second pressure gauge PT2 received by the DCS system exceeds the second pressure threshold, the second venting valve PV2 is controlled to be opened. The hydrogen is vented through the second venting pipeline 2 and the first venting pipeline 1, so as to relieve the internal pressure of the pipeline at the front end of the hydrogen conveying pipeline 3, to make the hydrogen at the rear end of the hydrogen conveying pipeline 3 be stably conveyed.

[0022] In the embodiment, the third pressure gauge PT3 and the second pressure regulating valve PIC2 are arranged on the main hydrogen delivery pipe 4, the fourth pressure gauge PT4 is arranged on the large-flow delivery pipe 7, the input end of the third venting pipe 5 is communicated with the large-flow delivery pipe 7, the output end of the third venting pipe 5 is communicated with the second venting pipe 2 at the rear end of one of the second venting valves PV2, the third venting valve PV3 is arranged on the third venting pipe 5, the third pressure gauge PT3, the fourth pressure gauge PT4, the third venting valve PV3 and the second pressure regulating valve PIC2 are respectively connected with the DCS system, and the third pressure threshold is arranged in the DCS system. The internal pressure of the main hydrogen delivery pipe 4 at the front end of the second pressure regulating valve PIC2 is detected by the third pressure gauge PT3, the internal pressure of the large-flow delivery pipe 7 is monitored by the fourth pressure gauge PT4, when the pressure value detected by the fourth pressure gauge PT4 exceeds the third pressure threshold, the third venting valve PV3 is controlled to be opened, and part of the hydrogen in the large-flow delivery pipe 7 is vented through the third venting pipe 5 and the second venting pipe 2, so as to relieve the internal pressure of the large-flow delivery pipe 7 and stabilize the delivery of the hydrogen in the large-flow delivery pipe 7.

[0023] In the embodiment, the input end of the small-flow delivery pipe 6 is connected with the main hydrogen delivery pipe 4, the first flow meter LT1, the flow regulating valve LV and the fifth pressure gauge PT5 are arranged on the small-flow delivery pipe 6, the first flow meter LT1, the flow regulating valve LV and the fifth pressure gauge PT5 are connected with the DCS system, the hydrogen flow in the small-flow delivery pipe 6 is detected by the first flow meter LT1, the internal pressure of the small-flow delivery pipe 6 is detected by the fifth pressure gauge PT5, the opening of the flow regulating valve is controlled by the DCS system according to the detection values, so as to adjust the internal flow and pressure of the small-flow delivery pipe 6 and realize the stable delivery of the hydrogen.

[0024] In the embodiment, the second flow meter LT2 is further arranged on the large-flow delivery pipe 7 and connected with the DCS system. When the fourth pressure gauge PT4 fails, the second flow meter LT2 can be used as a substitute pressure detection device.

[0025] In the embodiment, the output end of each first venting pipe 1 is connected with a positive water seal, the output pipeline of the positive water seal is connected with a steam pipeline 8 and a nitrogen pipeline 9, the steam valve HV1 is arranged on the steam pipeline 8, the nitrogen valve HV2 is arranged on the nitrogen pipeline 9, the positive water seal is a one-way flow structure, which avoids the backflow of the hydrogen through the first venting pipe 1, when the hydrogen is on fire, the DCS system controls the steam valve HV1 and the nitrogen valve HV2 to be opened, the steam and the nitrogen enter the output pipeline of the positive water seal, so as to suffocate the fire.

[0026] The working principle of the embodiment is as follows:

[0027] The three hydrogen distribution stations of the embodiment correspond to delivering hydrogen to the hydrogen delivery pipeline 3 respectively, preferably, the first pressure threshold value, the second pressure threshold value and the third pressure threshold value of the DCS system are 102 Kpa, 85 Kpa and 65 Kpa respectively, the DCS system controls the internal pressure of the hydrogen distribution station to be maintained at 100 Kpa through the first pressure regulating valve PIC1, when the internal pressure of the hydrogen distribution station detected by the first pressure gauge PT1 is greater than 102 Kpa, the DCS system controls the corresponding first vent valve PV1 to be opened, and part of the hydrogen in the hydrogen distribution station is discharged to the corresponding positive water seal through the corresponding first vent pipeline 1; when the internal pressure in the hydrogen delivery pipeline 3 between the back end of the first pressure regulating valve PIC1 and the external hydrogen delivery main pipeline 4 detected by the second pressure gauge PT2 is greater than 85 Kpa, the DCS system controls the corresponding second vent valve PV2 to be opened, and part of the hydrogen in the hydrogen delivery pipeline 3 is discharged through the second vent pipeline 2 and the first vent pipeline 1 until the internal pressure in the hydrogen delivery pipeline 3 is less than 85 Kpa; when the internal pressure of the large-flow external delivery pipeline 7 detected by the fourth pressure gauge PT4 is greater than 65 Kpa, the DCS system controls the third vent valve PV3 to be opened, and part of the hydrogen in the large-flow external delivery pipeline 7 is discharged through the third vent pipeline 5 and the second vent pipeline 2 until the internal pressure of the large-flow external delivery pipeline 7 is less than 65 Kpa. Through the three-stage pressure stabilizing structure, part of the hydrogen is stably delivered to the users with larger hydrogen demand through the hydrogen delivery pipeline 3, the external hydrogen delivery main pipeline 4 and the large-flow external delivery pipeline 7, and the other part of the hydrogen is stably delivered to the users with smaller hydrogen demand through the hydrogen delivery pipeline 3, the external hydrogen delivery main pipeline 4 and the small-flow external delivery pipeline 6.

[0028] The above only describes the preferred and feasible embodiments of the utility model, and does not limit the scope of the utility model, and equivalent changes made by applying the utility model specification and its drawings are included in the scope of the utility model.

Claims

1. A stable hydrogen delivery system, characterized by: It includes multiple hydrogen transmission pipelines, external hydrogen delivery mains, large-flow external delivery pipelines and small-flow external delivery pipelines. Each hydrogen transmission pipeline is connected to the front end of the external hydrogen delivery main, and the large-flow external delivery pipeline and the small-flow external delivery pipeline are respectively connected to the rear end of the external hydrogen delivery main; the input end of each hydrogen transmission pipeline is provided with a hydrogen distribution platform, the front end of each hydrogen transmission pipeline and the hydrogen distribution platform are provided with a first-level pressure stabilizing component, the rear end of each hydrogen transmission pipeline is provided with a second-level pressure stabilizing component, the external hydrogen delivery main and the large-flow external delivery pipeline are provided with a third-level pressure stabilizing component, and the small-flow external delivery pipeline is provided with a flow stabilizing component; the first-level pressure stabilizing component, the second-level pressure stabilizing component, the third-level pressure stabilizing component and the flow stabilizing component are all connected to the DCS system, and the DCS system is provided with gradually decreasing pressure thresholds corresponding to the first-level pressure stabilizing component, the second-level pressure stabilizing component and the third-level pressure stabilizing component.

2. The stable hydrogen delivery system according to claim 1, characterized in that: The first-level pressure stabilization component includes a first pressure gauge, a first vent pipe, a first vent valve and a first pressure regulating valve; the first pressure gauge is used to detect the internal pressure of the hydrogen distribution platform, one end of the first vent pipe is connected to the hydrogen distribution platform, the other end of the first vent pipe is used for emptying, and the first vent valve is arranged on the first vent pipe; the first pressure regulating valve is arranged at the front end of the hydrogen delivery pipeline, and the first pressure gauge, the first pressure regulating valve and the first vent valve are respectively connected to the DCS system.

3. The stable hydrogen delivery system according to claim 2, characterized in that: The secondary pressure stabilization assembly includes a second pressure gauge, a second vent pipe and a second vent valve. The second pressure gauge is arranged on the hydrogen delivery pipe at the rear end of the first pressure regulating valve. The input end of the second vent pipe is connected to the hydrogen delivery pipe between the first pressure regulating valve and the second pressure gauge. The other end of the second vent pipe is connected to the first vent pipe. The second vent valve is arranged on the second vent pipe. The second pressure gauge and the second vent valve are respectively connected to the DCS system.

4. The stable hydrogen delivery system according to claim 3, characterized in that: The three-stage pressure stabilization assembly includes a third pressure gauge, a fourth pressure gauge, a third vent pipe, a third vent valve and a second pressure regulating valve. The third pressure gauge and the second pressure regulating valve are arranged on the hydrogen delivery main pipe, and the fourth pressure gauge is arranged on the large-flow delivery pipe. One end of the third vent pipe is connected to the large-flow delivery pipe, and the other end of the third vent pipe is connected to the second vent pipe at the rear end of the second vent valve. The third vent valve is arranged on the third vent pipe. The third pressure gauge, the fourth pressure gauge, the third vent valve and the second pressure regulating valve are respectively connected to the DCS system.

5. The stable hydrogen delivery system according to claim 1, characterized in that: One end of the small flow delivery pipeline is connected to the hydrogen delivery main pipe, and the small flow delivery pipeline is provided with a first flow meter, a flow regulating valve and a fifth pressure gauge, which are connected to the DCS system.

6. The stable hydrogen delivery system according to claim 1, characterized in that: A second flow meter is also provided at the rear end of the hydrogen delivery main pipe, and the second flow meter is connected to the DCS system.

7. The stable hydrogen delivery system according to claim 2, characterized in that: The other end of each first vent pipe is connected to a positive water seal, and the output end of the positive water seal is connected to a nitrogen pipeline and a steam pipeline. A nitrogen valve is provided on the nitrogen pipeline, and a steam valve is provided on the steam pipeline.

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