An operating method is provided for a cryopressure tank in which cryogenic hydrogen for supplying a motor vehicle fuel cell can be stored under supercritical pressure at 13 bar or more. In order to compensate the pressure drop resulting from removal of hydrogen from the cryopressure tank, either a h
An operating method is provided for a cryopressure tank in which cryogenic hydrogen for supplying a motor vehicle fuel cell can be stored under supercritical pressure at 13 bar or more. In order to compensate the pressure drop resulting from removal of hydrogen from the cryopressure tank, either a heat transfer medium is supplied to a heat exchanger provided in the cryopressure tank via a control valve over a period of time which significantly exceeds the cycle times of a conventional cycle valve or the heat transfer medium is not supplied to the heat exchanger. Depending on the fill level of the cryopressure tank, the control valve is actuated with respect to a desired temperature or a desired pressure of the hydrogen in the cryopressure tank. As long as there is a risk of liquefaction of the residual hydrogen in the cryopressure tank, as is the case when the temperature falls below the critical temperature of 33 K if the pressure drops below the critical pressure of approximately 13 bar, during the removal of cryogenic hydrogen from the cryopressure tank, the temperature is adjusted such that it does not drop below the critical temperature of 33 Kelvin. If the fill state in the cryopressure tank drops further, the pressure in the cryopressure tank is adjusted when there is no longer a risk of liquefaction such that the pressure does not drop below a minimum pressure value which the hydrogen that is removed from the cryopressure tank must have in order to be usable in the consumer without restricting the function thereof.
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1. An operating method for a cryopressure tank, in which cryogenic hydrogen for supplying a consumer is storable at a supercritical pressure of 13 bar or more, the method comprising the acts of: either supplying a heat transfer medium to a heat exchanger provided in the cryopressure tank via a contr
1. An operating method for a cryopressure tank, in which cryogenic hydrogen for supplying a consumer is storable at a supercritical pressure of 13 bar or more, the method comprising the acts of: either supplying a heat transfer medium to a heat exchanger provided in the cryopressure tank via a control valve, or not supplying the heat transfer medium into said heat exchanger, in order to compensate for pressure loss resulting from hydrogen removal from the cryopressure tank;actuating the control valve with respect to a desired temperature or a desired pressure of the hydrogen in the cryopressure tank based on a fill level of the cryopressure tank; wherein: in a case of a higher filling level and as long as there is a risk of liquefaction of residual hydrogen in the cryopressure tank during the removal of the cryogenic hydrogen from the cryopressure tank, adjusting a temperature of the hydrogen located in the cryopressure tank such that it does not drop below a critical temperature of 33.18 Kelvin, andin a case of a low fill level, when there is no longer the risk of liquefaction during the removal of the cryogenic hydrogen from the cryopressure tank and as long as this is possible with a residual amount of hydrogen contained in the cryopressure tank, adjusting a pressure in the cryopressure tank such that it does not drop below a minimum pressure value which the hydrogen removed from the cryopressure tank must have to be usable in the consumer without limiting the function thereof. 2. The operating method according to claim 1, wherein when the cryopressure tank is completely filled and with the continuous removal of the hydrogen from the cryopressure tank and the pressure prevailing in the cryopressure tank approaching a critical pressure of 12.81 bar, a pressure value in the order of magnitude of 13 bar to 15 bar is set as another control criterion in addition to the adjusting of the temperature of the hydrogen in the cryopressure tank above the critical temperature. 3. The operating method according to claim 2, wherein if the removal of the hydrogen from the cryopressure tank and the supply of the heat into the cryopressure tank in view of maintaining a pressure in the order of magnitude of 13 bar to 15 bar and a temperature of the hydrogen above the critical temperature results in a temperature increase of the hydrogen in the cryopressure tank, the pressure in the cryopressure tank is adjusted to a lower value in the order of magnitude of 3 bar to 7 bar. 4. The operating method according to claim 1, wherein if the removal of the hydrogen from the cryopressure tank and the supply of the heat into the cryopressure tank in view of maintaining a pressure in the order of magnitude of 13 bar to 15 bar and a temperature of the hydrogen above the critical temperature results in a temperature increase of the hydrogen in the cryopressure tank, the pressure in the cryopressure tank is adjusted to a lower value in the order of magnitude of 3 bar to 7 bar. 5. The operating method according to claim 1, wherein fuel removed from the cryopressure tank and heated in the heat exchanger is used as the heat transfer medium and is supplied to the heat exchanger in the cryopressure tank via a branch line branching off of a supply line that leads to the consumer, and after flowing through said heat exchanger, the heat is fed into the supply line downstream of the branch line. 6. The operating method according to claim 5, wherein a pressure control unit is provided in the supply line downstream of the branch line configured to supply hydrogen at the desired pressure to the consumer despite changes in pressure in the supply line upstream of the pressure control unit caused by switching of the control valve. 7. The operating method according to claim 1, wherein a fuel cell system is the consumer, waste heat of the fuel cell system being supplied at least in part to the heat transfer medium if a higher cooling capacity demand of the fuel cell system cannot be completely covered by a cooling system using surrounding air as a temperature sink, wherein depending on a current cooling capacity demand, heat dissipation from the fuel cell system with heat supply into the cryopressure tank is carried out until the hydrogen located in the cryopressure tank has reached a predefined maximum pressure. 8. The operating method according to claim 5, wherein a fuel cell system is the consumer, waste heat of the fuel cell system being supplied at least in part to the heat transfer medium if a higher cooling capacity demand of the fuel cell system cannot be completely covered by a cooling system using surrounding air as a temperature sink, wherein depending on a current cooling capacity demand, heat dissipation from the fuel cell system with heat supply into the cryopressure tank is carried out until the hydrogen located in the cryopressure tank has reached a predefined maximum pressure.
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이 특허에 인용된 특허 (3)
Lehman Jean-Yves (Maisons Alfort FRX) Mirigay Charles (Saint Maur des Fosss FRX), High-pressure gas supply installation.
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