METHOD AND DEVICE FOR FILLING A HIGH PRESSURE STORAGE TANK

Abstract

The invention relates to a method for adjusting a hydrogen outlet temperature at a filling station, comprising inter alia a liquid reservoir (1), a cryopump (2), a heat exchanger (6), a gas reservoir (11) and a mixing point (7), wherein a cold hydrogen stream and a warm hydrogen stream are intermixed such that the temperature at the mixing point (7) lies between 30 and 45 C.

Claims

1. A method for adjusting a hydrogen outlet temperature at a filling station that comprises a liquid reservoir, a cryopump, a heat exchanger, a gas reservoir and a mixing point, characterized in that a cold hydrogen stream and a warm hydrogen stream are mixed in such a way that the temperature at the mixing point lies between 30 and 45 C.

2. The method according to claim 1, characterized in that the temperature at the mixing point lies between 33 and 40 C.

3. The method according to claim 1, characterized in that the cold gas stream has a temperature between 243 and 203 C.

4. The method according to claim 1, characterized in that the warm gas stream has an ambient temperature.

5. The method according to claim 1, characterized in that the hydrogen streams have a pressure between 20 and 1500 bar downstream of the cryopump.

6. The method according to claim 5, characterized in that the pressure of the hydrogen streams is adjusted with a pressure controller that is positioned downstream of the gas reservoir.

7. The method according to claim 1, characterized in that hydrogen is stored in the gas reservoir at a pressure of 500 to 2000 bar.

8. The method according to claim 1, characterized in that the quantity of hydrogen being conveyed by the cryopump is controlled with the frequency of the reciprocating piston.

9. The method according to claim 1, characterized in that the hydrogen is warmed up in a heat exchanger.

10. The method according to claim 3, characterized in that the cold gas stream has a temperature between 203 and 80 C.

11. The method according to claim 4, characterized in that the warm gas stream has a temperature between 20 and +40 C.

12. The method according to claim 5, characterized in that the hydrogen streams have a pressure between 350 and 1000 bar.

13. The method according to claim 12, characterized in that the hydrogen streams have a pressure between 700 and 900 bar.

14. The method according to claim 6, characterized in that the hydrogen streams is the warm hydrogen stream.

15. The method according to claim 7, characterized in that hydrogen is stored in the gas reservoir at a pressure of 800 to 1000 bar.

Description

[0030] FIG. 1 shows a preferred embodiment of the inventive method. Hydrogen is stored in liquid form in a liquid reservoir 1. The liquid hydrogen is withdrawn from the liquid reservoir 1 by means of a cryopump 2 and only conveyed or also compressed depending on the respective requirements. The gas stream from the cryopump 2 is divided into a gas line 4 and/or a gas line 5 in a manifold 3. The gas line 4 directly feeds the gas stream from the cryopump 2 to the mixing point 7. The gas stream exiting the cryopump 2 has a temperature between 223 and 210 C. and a pressure of 900 bar. The gas line 5 leads to the mixing point 7 via a heat exchanger 6 and a gas line 8. Starting from the gas line 5, the gas line 9 branches off the gas line 8 downstream of the heat exchanger. The gas line 9 leads to the gas reservoir 11 via a shut-off valve 10. The gas reservoir 11 is a high-pressure reservoir, which is divided into multiple storage containers that can be separated from one another. The hydrogen gas heated by means of the heat exchanger 6 is stored in the gas reservoir 11 at a pressure of 500 to 1000 bar and a temperature of 20 to 40 C. The gas can be once again fed into the gas line 5 by means of the pressure controller 12 and likewise fed to the mixing point 7 via the heat exchanger 6 and the gas line 8. The temperature at the mixing point 7 is measured with a temperature sensor T. The temperature sensor T is connected to the drive unit M of the cryopump 2 via a data link. The temperature measured at the mixing point 7 specifies the temperature, at which the hydrogen is dispensed into the storage tank of the vehicle. This temperature must lie between 33 and 40 C. In order to adjust this temperature, a cold stream, which originates directly from the cryopump and is delivered via the gas line 4, is mixed with the warmer stream from the gas line 8 at the mixing point. A gas line 13 leads from the mixing point 7 into the fuel dispenser 14 and the filling hose 15, by means of which the storage tank of the vehicle is filled with hydrogen.

LIST OF REFERENCE SYMBOLS

[0031] 1 Liquid reservoir [0032] 2 Cryopump [0033] 3 Manifold [0034] 4 Gas line [0035] 5 Gas line [0036] 6 Heat exchanger [0037] 7 Mixing point [0038] 8 Gas line [0039] 9 Gas line [0040] 10 Shut-off valve [0041] 11 Gas reservoir [0042] 12 Pressure controller [0043] 13 Gas line [0044] 14 Fuel dispenser [0045] 15 Filling hose