Method for transporting hydrogen using a water pipe and transport line

Abstract

The application discloses a method and a conveying pipeline for conveying hydrogen by using a water pipe, relates to the hydrogen energy conveying technical field, and aims at solving the problem of high cost of independently laying a hydrogen conveying pipeline; the application is characterized in that: the existing water conveying pipeline made of hydrogen-permeation-resistant material is reformed, or the to-be-built water conveying pipeline is designed as a hydrogen-permeation-resistant material; vacuum is first extracted at the front end of the water inflow direction of the water pipe where hydrogen is to be introduced, purity after hydrogen is introduced subsequently is guaranteed, hydrogen is introduced into the water pipe after vacuum extraction and is mixed with water for conveying, the gas-water mixture is injected into a water tank when conveying to a user to realize gas-water separation, hydrogen is extracted from the upper end of the water tank, water is output from the lower part, and tail end conveying is realized by different pipelines respectively; the method is simple and reasonable, hydrogen mixed conveying can be realized by using the existing or to-be-built water pipe, and the cost of a special hydrogen conveying pipeline and construction time can be greatly saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the hydrogen energy delivery field, in particular to a method for delivering hydrogen gas by using water pipes and a delivery pipeline. BACKGROUND

[0002] Hydrogen energy is an ideal clean energy with great development potential. In the field of hydrogen delivery, how to conveniently, efficiently and safely deliver hydrogen gas has become a problem to be solved. At present, hydrogen delivery mainly adopts three ways: high-pressure tank delivery, low-temperature liquid delivery and pipeline delivery. According to the hydrogen delivery distance, hydrogen demand and terminal user distribution, considering the economy and environmental protection, in the case of large hydrogen delivery and long distance, using pipeline to deliver hydrogen gas is the most efficient and economical way.

[0003] The hydrogen pipeline construction in China is still in its infancy and is mainly constructed in the Bohai Bay, Yangtze River Delta and other regions. New hydrogen delivery pipelines require a lot of cost and time, and need to consider the problem of hydrogen embrittlement. If the existing laid pipelines or other resource delivery pipelines to be laid can be used to realize safe delivery of hydrogen gas, the resource and time cost can be greatly reduced. Therefore, a method for delivering hydrogen gas by using water pipes and a delivery pipeline are needed to solve this problem. SUMMARY

[0004] The purpose of the present application is to provide a method for delivering hydrogen gas by using water pipes and a delivery pipeline to solve the problem of high cost of independently laying hydrogen delivery pipelines.

[0005] To achieve the above purpose, the present application provides the following technical solutions: a method for delivering hydrogen gas by using water pipes, on the basis of the existing water delivery pipeline made of hydrogen gas permeation resistant material, the water delivery pipeline to be built is designed to be made of hydrogen gas permeation resistant material; vacuum is first extracted at the front end of the water pipe where hydrogen gas is to be introduced in the direction of incoming water to ensure the purity after hydrogen gas is introduced subsequently, and then hydrogen gas is introduced into the water pipe after vacuum extraction and mixed with water for delivery; when delivered to the user, the gas-water mixture is injected into a water tank to realize gas-water separation, hydrogen gas is extracted from the upper end of the water tank, water is output from the lower part, and tail end delivery is realized through different pipelines respectively.

[0006] Another technical solution provided by the present application is a delivery pipeline for delivering hydrogen gas by using water pipes, which comprises a water supply pipeline and a water delivery pipeline, and further comprises a hydrogen gas supply pipeline, a hydrogen gas delivery pipeline and a gas-water two-phase flow pipeline; the inlet end of the gas-water two-phase flow pipeline is divided into two paths and connected to the hydrogen gas supply pipeline and the water supply pipeline respectively, the outlet end of the gas-water two-phase flow pipeline is connected to a sealed water tank, the upper end of the water tank is provided with a gas outlet pipe for connecting to the hydrogen gas delivery pipeline, and the lower part is connected to the water delivery pipeline.

[0007] The middle part of the hydrogen gas supply pipeline is also connected with a hydrogen gas buffer tank for storing a certain amount of hydrogen gas and stabilizing the pipe network pressure, and the hydrogen gas supply pipeline is connected with a hydrogen gas ejector device at the end close to the gas-water two-phase flow pipeline.

[0008] Preferably, the hydrogen gas supply pipeline is also connected with an air extraction device and a gas-liquid separation device, wherein the air extraction device is connected at the end close to the closed water tank for providing hydrogen gas transmission power, and the gas-liquid separation device is provided with a plurality of gas pipes at the upper part and liquid collecting funnels at the lower part, and the lower end of the liquid collecting funnel is connected to the water transmission pipeline through a liquid discharge pipe.

[0009] Preferably, a check valve is further connected between the hydrogen gas ejector device and the gas-water two-phase flow pipeline for preventing water from flowing back to the hydrogen gas buffer tank.

[0010] Preferably, the inlet end of the gas-water two-phase flow pipeline is provided with a diameter expansion pipe, and the cross-sectional area of the diameter expansion pipe is greater than that of the water supply pipeline.

[0011] Preferably, the hydrogen gas supply pipeline, the hydrogen gas transmission pipeline, the water supply pipeline, the water transmission pipeline and the gas-water two-phase flow pipeline are all composite pipes made of plastic materials capable of preventing hydrogen gas permeation.

[0012] Compared with the prior art, the present application has the following beneficial effects:

[0013] 1. The method for transporting hydrogen gas by using water pipes is simple and reasonable, and can realize hydrogen gas mixed transportation by using existing or to-be-built water pipes, thereby greatly saving the expenses and construction time of special hydrogen gas transmission pipelines.

[0014] 2. The hydrogen gas transmission pipeline by using water pipes can realize safe transportation of hydrogen gas to users, and can effectively solve the transportation and utilization problem of hydrogen gas in enterprises. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic view of one embodiment of the transmission pipeline of the present application.

[0016] In the figure: 11, hydrogen gas supply pipeline; 12, hydrogen gas transmission pipeline; 21, water supply pipeline; 22, water transmission pipeline; 3, hydrogen gas buffer tank; 4, hydrogen gas ejector device; 5, vacuum extraction device; 6, gas-water two-phase flow pipeline; 7, closed water tank; 8, air extraction device; 9, gas-liquid separation device. DETAILED DESCRIPTION

[0017] The solution provided by the present invention can be used to modify existing water pipelines made of hydrogen-resistant materials, or to design water pipelines to be built with hydrogen-resistant materials. Specifically, the water pipelines made of hydrogen-resistant materials should preferably be made of composite pipes made of plastic materials, such as polyethylene.

[0018] During the renovation design, it is necessary to first vacuum the front end of the water pipe where hydrogen is to be introduced to ensure the purity of the subsequent hydrogen introduction, and then introduce the hydrogen into the vacuumed water pipe to achieve mixed transportation of hydrogen and water; when transporting to the user's location, the gas-water mixture is injected into the water tank to achieve gas-water separation, and hydrogen is extracted from the upper end of the water tank and water is output from the lower end and transported to the tail end through different pipelines.

[0019] In order to ensure the effective implementation of the above method, the present invention also provides a pipeline for transporting hydrogen using a water pipe, see Figure 1 , including a water supply pipeline 21 and a water delivery pipeline 22, and also including a hydrogen supply pipeline 11, a hydrogen delivery pipeline 12 and a gas-water two-phase flow pipeline 6; wherein the inlet end of the gas-water two-phase flow pipeline 6 is divided into two paths respectively connected to the hydrogen supply pipeline 11 and the water supply pipeline 21, and the outlet end of the gas-water two-phase flow pipeline 6 is connected to a closed water tank 7, the upper end of which is provided with an air outlet pipe for connecting to the hydrogen delivery pipeline 12, and the lower part is connected to the water delivery pipeline 22. The closed water tank 7 can generally be set near the terminal hydrogen user point, that is, the main mixed transportation part of hydrogen and water is the gas-water two-phase flow pipeline 6;

[0020] The middle part of the hydrogen supply pipeline 11 is also connected to a hydrogen buffer tank 3 for storing a certain amount of hydrogen and stabilizing the pipeline pressure. The end of the hydrogen supply pipeline 11 close to the gas-water two-phase flow pipeline 6 is connected to a hydrogen ejector 4 for pressing the hydrogen into the gas-water two-phase flow pipeline 6. For reference, a check valve can also be connected between the hydrogen ejector 4 and the gas-water two-phase flow pipeline 6 to prevent water from flowing back to the hydrogen buffer tank 3; the upper end of the water supply pipeline 21 is connected to several vacuum pumping devices 5 for extracting the air in the water supply pipeline 21 to ensure the purity of the hydrogen.

[0021] Specifically, the hydrogen gas transmission pipeline 12 is also connected to an exhaust device 8 and a gas-liquid separation device 9, wherein the exhaust device 8 is connected to one end close to the sealed water tank 7, and is used to provide hydrogen transmission power and extract hydrogen from the water tank. There can be several gas-liquid separation devices 9, and its structure can be that it includes an air pipe located at the upper part and a liquid collecting funnel located at the lower part. The lower end of the liquid collecting funnel is connected to the water transmission pipeline 22 through a drain pipe. Furthermore, a valve can generally be provided in the middle of the drain pipe, and a certain liquid level should be maintained in the drain pipe to avoid hydrogen leakage.

[0022] In a preferable embodiment, the inlet end of the gas-water two-phase flow pipeline 6 is provided with a diameter expansion pipe, the cross-sectional area of which is larger than that of the water supply pipeline 21, so as to ensure the simultaneous transportation of hydrogen and water in the pipeline.

[0023] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical scope disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be defined by the protection scope of the claims.

[0024] The parts not described in the present application are the known technology of the person skilled in the art.

Claims

1. A delivery pipeline, comprising a water supply pipeline (21) and a water delivery pipeline (22), characterized in that: It also includes a hydrogen supply pipeline (11), a hydrogen transmission pipeline (12) and a gas-water two-phase flow pipeline (6); wherein the inlet end of the gas-water two-phase flow pipeline (6) is divided into two paths connected to the hydrogen supply pipeline (11) and the water supply pipeline (21) respectively, and the outlet end of the gas-water two-phase flow pipeline (6) is connected to a closed water tank (7), the upper end of which is provided with an air outlet pipe for connecting to the hydrogen transmission pipeline (12), and the lower part is connected to the water transmission pipeline (22); the middle part of the hydrogen supply pipeline (11) is also connected to a hydrogen buffer tank (3) for storing a certain amount of hydrogen and stabilizing the pipeline network pressure, and the end of the hydrogen supply pipeline (11) close to the gas-water two-phase flow pipeline (6) is connected to a hydrogen ejector device (4); the upper end of the water supply pipeline (21) is connected to a plurality of vacuum devices (5) for extracting air from the water supply pipeline (21); The hydrogen gas transmission pipeline (12) is further connected to an air extraction device (8) and a gas-liquid separation device (9), wherein the air extraction device (8) is connected to one end close to the sealed water tank (7) for providing hydrogen transmission power, and the gas-liquid separation device (9) is provided with a plurality of gas-liquid separation devices (9), which include an air pipe at the upper part and a liquid collecting funnel at the lower part, and the lower end of the liquid collecting funnel is connected to the water transmission pipeline (22) through a drain pipe; A check valve is also connected between the hydrogen ejector device (4) and the gas-water two-phase flow pipeline (6) to prevent water from flowing back into the hydrogen buffer tank (3); The inlet end of the gas-water two-phase flow pipeline (6) is provided with an expansion pipe, the cross-sectional area of ​​which is larger than the cross-sectional area of ​​the water supply pipeline (21); The hydrogen supply pipeline (11), hydrogen transmission pipeline (12), water supply pipeline (21), water transmission pipeline (22), and gas-water two-phase flow pipeline (6) all adopt composite pipes made of plastic material that can prevent hydrogen from penetrating.

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