Medium pressure hydrogen, natural gas and coke oven gas storage and blended delivery system

Abstract

The application discloses a medium-pressure hydrogen, natural gas and coke oven gas storage and mixed delivery system. The system comprises a natural gas tank body, a hydrogen tank body is arranged in the natural gas tank body, a natural gas inlet and a natural gas outlet are arranged on the natural gas tank body, a natural gas pipeline is arranged on the natural gas outlet, a hydrogen inlet and a hydrogen outlet are arranged on the hydrogen tank body, a hydrogen pipeline is arranged on the hydrogen outlet, the hydrogen inlet and the hydrogen outlet are led out on the natural gas tank body through pipelines, a safety discharge system is arranged on the natural gas tank body and the hydrogen tank body, a coke oven gas pipeline is further arranged, and a mixed pipeline is arranged between the natural gas pipeline and the hydrogen pipeline and between the coke oven gas pipeline and the hydrogen pipeline. The hydrogen, the coke oven gas or the natural gas mixed process system is simulated and calculated through software flow field, safety facilities are additionally arranged, and the safe and reliable operation of the pipeline network system is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of medium pressure hydrogen, natural gas and coke oven gas storage and mixed delivery system. BACKGROUND

[0002] Hydrogen energy is an ideal clean energy, with great development potential. In the field of hydrogen storage and transportation, how to store and transport hydrogen conveniently and efficiently becomes a problem to be solved. According to the different forms of hydrogen, there are currently mainly solid hydrogen storage, low-temperature liquid hydrogen storage, high-pressure gaseous hydrogen storage and organic liquid hydrogen storage, each has its own characteristics and application range. Among them, high-pressure gaseous hydrogen storage is the most widely used hydrogen storage technology at present. However, the widely used metal materials at present stage, especially the high-strength materials that can be used to manufacture high-pressure containers, will be affected by hydrogen embrittlement when in contact with hydrogen for a long time, that is, the strength and plasticity will be significantly reduced, and hydrogen-induced delayed fracture under low stress will occur, which is generally referred to as hydrogen embrittlement or hydrogen damage. The existence of hydrogen embrittlement risk may cause the failure of hydrogen storage tank, and combined with the flammable and explosive characteristics of hydrogen, it is easy to cause fire, explosion and even major disaster. Therefore, hydrogen storage, especially high-pressure hydrogen storage, has higher requirements for storage tank conditions. China's hydrogen pipeline construction is still in its infancy, mainly in the Bohai Bay, Yangtze River Delta and other regions. Since a large amount of cost and time is needed for the construction of new hydrogen pipelines, many countries have begun to use existing natural gas pipelines for hydrogen-natural gas blending research and experiments. SUMMARY

[0003] In view of the above defects, the purpose of the present application is to provide a medium pressure hydrogen, natural gas and coke oven gas storage and mixed delivery system, which realizes large-capacity safe hydrogen storage and utilization of existing pipeline hydrogen transmission in the plant.

[0004] To achieve the above purpose, the medium pressure hydrogen, natural gas and coke oven gas storage and mixed delivery system of the present application comprises a natural gas tank body, a hydrogen tank body is arranged in the natural gas tank body;

[0005] A natural gas inlet and a natural gas outlet are arranged on the natural gas tank body, and a natural gas pipeline is arranged at the natural gas outlet;

[0006] A hydrogen inlet and a hydrogen outlet are arranged on the hydrogen tank body, and a hydrogen pipeline is arranged at the hydrogen outlet;

[0007] The hydrogen inlet and the hydrogen outlet are led out of the natural gas tank body through a pipeline;

[0008] A safety discharge system is arranged on the natural gas tank body and the hydrogen tank body;

[0009] It also includes a coke oven gas pipeline;

[0010] A mixing pipeline is installed between the natural gas pipeline and the hydrogen pipeline, as well as between the coke oven gas pipeline and the hydrogen pipeline.

[0011] Furthermore, the coke oven gas pipeline is pressurized by a pressurizer.

[0012] Furthermore, the natural gas and hydrogen mixing pipeline mixes medium-pressure hydrogen with medium-pressure natural gas, and the pipeline is equipped with safety facilities such as regulating valves, safety valves, and temperature and pressure measuring points.

[0013] Furthermore, the coke oven gas and hydrogen mixing pipeline mixes the pressurized coke oven gas with medium-pressure hydrogen, and the pipeline is equipped with safety facilities such as regulating valves, safety valves, and temperature and pressure measuring points.

[0014] Furthermore, the natural gas tank is made of high-strength alloy steel.

[0015] Furthermore, the hydrogen tank is made of carbon fiber composite material.

[0016] Furthermore, both the natural gas tank and the hydrogen tank are equipped with safety emission systems and tank heads.

[0017] Furthermore, the safety emission system includes an overpressure emission safety valve, a purge vent, a pressure gauge port, and a maintenance manhole.

[0018] The storage, mixing, and conveying system of this invention features a novel dual-tank system for medium-pressure hydrogen and natural gas, offering excellent sealing, a large nominal volume, and safe and reliable operation. The hydrogen mixing process with coke oven gas or natural gas incorporates safety features through software flow field simulation and calculation, ensuring the safe and reliable operation of the pipeline system. Its economic benefits have been verified in practical operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the dual full-tank structure for medium-pressure hydrogen and natural gas in this invention.

[0020] Figure 2 This is a schematic diagram of a medium-pressure hydrogen, natural gas, and coke oven gas storage, blending, and transportation system. Detailed Implementation

[0021] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0022] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] like Figure 1 As shown. This invention relates to a novel medium-pressure dual-tank for hydrogen and natural gas, specifically applied to hydrogen storage.

[0026] The system includes a natural gas tank (1), a hydrogen tank (12), a natural gas inlet (2), a natural gas outlet (3), a hydrogen inlet (4), a hydrogen outlet (5), a coke oven gas pipeline (6), a natural gas and hydrogen mixing pipeline (7), a coke oven gas and hydrogen mixing pipeline (8), a natural gas pipeline (9), a mixed gas pipeline (10), a coke oven gas pipeline (11), a natural gas safety emission system (14), a natural gas tank end cap (16), a hydrogen safety emission system (15), and a hydrogen tank end cap (13). The natural gas tank is made of high-strength alloy steel, and the tank wall thickness and weld quality meet the requirements for pressure vessels.

[0027] The coke oven gas pipeline is equipped with several valves and is pressurized by a compressor. The natural gas and hydrogen mixing pipeline mixes medium-pressure hydrogen with medium-pressure natural gas; the pipeline is equipped with regulating valves, safety valves, and safety devices such as temperature and pressure measuring points. The coke oven gas and hydrogen mixing pipeline mixes the pressurized coke oven gas with medium-pressure hydrogen; the pipeline is equipped with regulating valves, safety valves, and safety devices such as temperature and pressure measuring points.

[0028] The mixed gas pipeline can be a mixture of natural gas and hydrogen, a mixture of coke oven gas and hydrogen, or a mixture of natural gas, coke oven gas, and hydrogen. The mixing ratio of different gases can be adjusted by regulating the control valves on the natural gas and hydrogen mixing pipeline 7 and the coke oven gas and hydrogen mixing pipeline 8.

[0029] The hydrogen tank body is made of carbon fiber composite material, which has good tensile strength and corrosion resistance.

[0030] The pipeline is equipped with natural gas inlet and outlet, and features safety facilities such as regulating valves, safety valves, check valves, and temperature and pressure measuring points for the intake and exhaust of natural gas from the outer tank.

[0031] The pipeline is equipped with a hydrogen inlet and outlet, and features safety facilities such as a regulating valve, safety valve, check valve, and temperature and pressure measuring points for the intake and exhaust of hydrogen in the inner tank.

[0032] The natural gas tank safety venting system and tank head, including overpressure venting safety valves, purging vents, pressure gauge ports, and maintenance manholes, ensure the safe operation and convenient maintenance of the outer tank.

[0033] The hydrogen tank safety venting system and tank end caps, including overpressure venting safety valves, purging vents, pressure gauge ports, and maintenance manholes, ensure the safe operation of the inner tank and facilitate maintenance.

[0034] Under normal operating conditions, the hydrogen tank is used to store hydrogen, and the natural gas tank is used to store natural gas and hydrogen leaked from the inner tank. This allows for simultaneous storage of natural gas and hydrogen, effectively solving the problem of high leakage rates in hydrogen storage. This invention presents a medium-pressure hydrogen, natural gas, and coke oven gas storage and mixing and transportation system. The novel dual-tank system for medium-pressure hydrogen and natural gas features excellent sealing, a large nominal volume, and safe and reliable operation. The hydrogen mixing process with coke oven gas or natural gas, through software flow field simulation and calculation, incorporates safety features to ensure the safe and reliable operation of the pipeline system. Its economic benefits have been verified in practical operation.

[0035] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described above. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Many other changes and modifications made without departing from the concept and scope of the present invention should be considered within the scope of protection of the present invention.

[0036] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0037] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A medium-pressure hydrogen, natural gas, and coke oven gas storage, blending, and conveying system, characterized in that: Includes a natural gas tank, and a hydrogen tank is installed inside the natural gas tank; The natural gas tank is provided with a natural gas inlet and a natural gas outlet, and a natural gas pipeline is provided at the natural gas outlet. The hydrogen tank is provided with a hydrogen inlet and a hydrogen outlet, and a hydrogen pipeline is provided at the hydrogen outlet. The hydrogen inlet and hydrogen outlet are led out of the natural gas tank through pipelines; The natural gas tank and hydrogen tank are equipped with safety emission systems; This also includes coke oven gas pipelines; A mixing pipeline is installed between the natural gas pipeline and the hydrogen pipeline, and between the coke oven gas pipeline and the hydrogen pipeline; the coke oven gas pipeline is pressurized by a compressor. The natural gas and hydrogen mixing pipeline mixes medium-pressure hydrogen with medium-pressure natural gas, and is equipped with regulating valves, safety valves, and safety facilities such as temperature and pressure measuring points. The coke oven gas and hydrogen mixing pipeline mixes pressurized coke oven gas with medium-pressure hydrogen. The pipeline is equipped with regulating valves, safety valves, and safety facilities such as temperature and pressure measuring points. Both the natural gas tank and the hydrogen tank are equipped with safety emission systems and tank heads; The aforementioned safety discharge system includes an overpressure discharge safety valve, a purge vent, a pressure gauge port, and a maintenance manhole.

2. The medium-pressure hydrogen, natural gas, and coke oven gas storage, blending, and conveying system according to claim 1, characterized in that: The natural gas tank is made of high-strength alloy steel.

3. The medium-pressure hydrogen, natural gas, and coke oven gas storage, blending, and conveying system according to claim 1, characterized in that: The hydrogen tank is made of carbon fiber composite material.

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