Filling system based on cold energy recovery

Abstract

The utility model discloses a filling system based on cold energy recovery, including ammonia filling unit and hydrogen storage unit, ammonia filling unit includes reheater, and the liquid ammonia feed pipe and hydrogen storage device that communicate therewith, reheater medium end intercommunication circulating water pipe and backwater pipe no.

Description

Technical Field

[0001] This utility model relates to the field of gas filling technology, specifically a filling system based on cold energy recovery. Background Technology

[0002] Ammonia tanker filling generally requires the temperature to be controlled above 0℃, otherwise the tanker is prone to frost or even ice formation. For this reason, a liquid ammonia reheater has been added to the existing filling system, using circulating water for reheating. Since the temperature of liquid ammonia is below -30℃, the temperature of the circulating water return water drops significantly, providing considerable cooling energy.

[0003] Solid-state hydrogen storage modules are a novel type of hydrogen storage device. Unlike hydrogen cylinder filling or tube-mounted filling, they typically utilize the physical adsorption of hydrogen by solid materials to store hydrogen within the solid material, releasing it by increasing the temperature or decreasing the pressure. Because the physical adsorption process generates heat, cryogenic filling is usually required to meet the hydrogen storage capacity requirements. However, current technologies require chilled water to lower the filling temperature during the hydrogen storage module filling process.

[0004] In summary, if the cold energy generated during the ammonia filling process is utilized in the hydrogen storage module, energy conservation and consumption reduction can be achieved. Utility Model Content

[0005] The purpose of this invention is to provide a filling system based on cold energy recovery, which uses the cold energy generated during the reheating process of liquid ammonia to cool the hydrogen storage module, thereby improving hydrogen storage capacity while achieving the goal of energy conservation and consumption reduction.

[0006] To achieve the above objectives, the solution of this utility model is as follows:

[0007] The filling system based on cold energy recovery includes an ammonia filling unit and a hydrogen storage unit. The ammonia filling unit includes a reheater, a liquid ammonia feed pipe connected to it, and an ammonia storage device. The medium end of the reheater is connected to a circulating water pipe and a return water pipe one. The hydrogen storage unit includes a hydrogen storage module, a chilled water pipe connected to it, and a return water pipe two. The return water pipe one is connected to the chilled water pipe. The hydrogen storage module is filled with solid adsorbent material for physical adsorption of hydrogen.

[0008] Furthermore, the chilled water pipe is connected to the output end of the chiller unit.

[0009] Preferably, the return water pipe 2 is connected to the water tank 2; the lower part of the water tank 2 is equipped with a pump 2 connected to the input end of the chiller unit.

[0010] More preferably, the upper part of the second water tank is provided with an overflow pipe and / or a water supply pipe.

[0011] Furthermore, the return water pipe is connected to the chilled water pipe via the water tank and the pump.

[0012] Furthermore, the return water pipe is also connected to a circulating water return pipe.

[0013] Furthermore, the liquid ammonia feed pipe is connected to the output end of the filling pump.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] The filling system described in this utility model uses the cold energy generated by the reheating of liquid ammonia in the ammonia filling unit to cool the hydrogen storage unit, thereby improving hydrogen storage capacity while saving energy and reducing consumption, and achieving cost reduction and efficiency improvement. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall filling system based on cold energy recovery provided by this utility model.

[0017] The attached figures are labeled as follows:

[0018] 10. Circulating water pipe; 11. Return water pipe 1; 12. Circulating water return pipe; 20. Chilled water pipe; 21. Return water pipe 2; 22. Overflow pipe; 23. Make-up water pipe; 100. Liquid ammonia pipe; 200. Hydrogen pipe; C1. Refrigeration unit; FP1. Filling pump; P1. Pump 1; P2. Pump 2; R1. Reheater; S1. Ammonia storage device; S2. Hydrogen storage module; T1. Water tank 1; T2. Water tank 2. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be understood that the terms "upper", "lower", "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 utility model 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 utility model.

[0021] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0022] In one embodiment, such as Figure 1 As shown, a filling system based on cold energy recovery is proposed, including an ammonia filling unit and a hydrogen storage unit. The ammonia filling unit includes a reheater R1, a liquid ammonia feed pipe 100 connected to it, and an ammonia storage device S1. The medium end of the reheater R1 is connected to a circulating water pipe 10 and a return water pipe 11. The hydrogen storage unit includes a hydrogen storage module S2, a chilled water pipe 20 connected to it, a return water pipe 21, and a hydrogen pipe 200 for feeding. The return water pipe 11 is connected to the chilled water pipe 20. The hydrogen storage module S2 is filled with solid adsorption material for physical adsorption of hydrogen.

[0023] In the above embodiment, the temperature of liquid ammonia rises after passing through the reheater R1, and at this point it is above the freezing point to avoid frost or even ice formation on the tank during filling. At the same time, the temperature of the circulating water, which serves as the reheating medium, drops and is used as the cooling medium for the hydrogen storage module S2, thereby improving the utilization rate of cooling capacity and increasing the hydrogen storage capacity.

[0024] It is understood that the circulating water temperature in the circulating water pipe 10 is at room temperature. Under one operating condition, when the circulating water reheats the liquid ammonia to 3°C, the water temperature can drop to 7°C, which meets the standard for chilled water and can replace the refrigeration unit to cool the hydrogen storage module S2.

[0025] It is understood that the ammonia filling unit can be used to fill the ammonia storage device S1 with ammonia gas or liquid ammonia. To improve the ammonia storage capacity, pressurized storage can be used.

[0026] In the above embodiments, the solid adsorbent material filled in the hydrogen storage module S2 is a common porous adsorbent material, such as activated carbon, metal-organic frameworks (MOFs), and carbon nanotubes. These materials have a high specific surface area and can adsorb a large number of hydrogen molecules. Based on the basic principle of exothermic physical adsorption, the adsorption effect can be improved and the hydrogen storage capacity can be increased by lowering the adsorption temperature without changing the pressure.

[0027] In a preferred embodiment, the return water pipe 11 is connected to the chilled water pipe 20 via a water tank T1 and a pump P1. This is to improve the stability of the flow rate of the medium used for cooling the hydrogen storage module S2, and also to allow the low-temperature return water in the return water pipe 11 to be temporarily stored in the water tank T1 when hydrogen storage is not in use, so that the pump P1 can be started to output the water when needed.

[0028] In a preferred embodiment, the return water pipe 11 is also connected to the circulating water return pipe 21. When hydrogen storage is not performed, the low-temperature return water in the return water pipe 11 can be directly returned to the circulating water.

[0029] In a preferred embodiment, a filling pump FP1 is provided at the front end of the liquid ammonia feed pipe 100, which can quickly and accurately complete the filling process, ensuring the accuracy and efficiency of filling.

[0030] In a preferred embodiment, the chilled water pipe 20 is connected to the output end of the chiller unit C1. When the return water pipe 11 stops or the supply of low-temperature return water is insufficient, the hydrogen storage module S2 can be cooled through the chiller unit C1.

[0031] In a preferred embodiment, to ensure the operational stability of the chiller unit C1, the second return water pipe 21 is connected to the second water tank T2; the lower part of the second water tank T2 is equipped with a second pump P2 connected to the input end of the chiller unit C1. More preferably, the upper part of the second water tank T2 is equipped with an overflow pipe 22 and a water supply pipe 23. When the first return water pipe 11 supplies cooling water to the hydrogen storage unit, the continuous return water entering the second water tank T2 will cause the liquid level to rise, and the overflow pipe 22 is used to discharge the excess water; when the second return water pipe 21 stops supplying chilled water, there is a certain amount of consumption during the operation of the chiller unit C1 and the return water storage process, which can be replenished through the water supply pipe 23 to ensure the normal water level.

[0032] It is understandable that the materials of the components used in the ammonia filling unit and hydrogen storage unit can be selected according to the requirements of low temperature corrosion resistance, and commonly used instruments, meters or valves can also be selected or added according to the operational requirements. All of the above are within the design scope of this solution and will not be elaborated here.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A filling system based on cold energy recovery, characterized in that, It includes an ammonia filling unit and a hydrogen storage unit; the ammonia filling unit includes a reheater (R1), a liquid ammonia feed pipe (100) connected to it, and an ammonia storage device (S1); the medium end of the reheater (R1) is connected to a circulating water pipe (10) and a return water pipe one (11); the hydrogen storage unit includes a hydrogen storage module (S2), a chilled water pipe (20) connected to it, and a return water pipe two (21); the return water pipe one (11) is connected to the chilled water pipe (20); the hydrogen storage module (S2) is filled with solid adsorption material for physical adsorption of hydrogen.

2. The filling system according to claim 1, characterized in that, The chilled water pipe (20) is connected to the output end of the chiller unit (C1).

3. The filling system according to claim 2, characterized in that, The return water pipe 2 (21) is connected to the water tank 2 (T2); the lower part of the water tank 2 (T2) is equipped with pump 2 (P2) which is connected to the input end of the chiller unit (C1).

4. The filling system according to claim 3, characterized in that, The upper part of the water tank (T2) is provided with an overflow pipe (22) and / or a water supply pipe (23).

5. The filling system according to claim 1, characterized in that, The return water pipe (11) is connected to the chilled water pipe (20) via the water tank (T1) and the pump (P1).

6. The filling system according to claim 1, characterized in that, The return water pipe (11) is also connected to the circulating water return pipe (12).

7. The filling system according to claim 1, characterized in that, The liquid ammonia feed pipe (100) is connected to the output end of the filling pump (FP1).

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