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Method for Assuring Compliance with Aspect of Hydrogen Dispensing Protocol J2601

IP.com Disclosure Number: IPCOM000249946D
Publication Date: 2017-May-05
Document File: 6 page(s) / 58K

Publishing Venue

The IP.com Prior Art Database

Abstract

[0001] Methods for assuring that a receiving tank having an initial pressure less than the set minimum required by any hydrogen dispensing protocol, such as J2601, is not violated. Alternative minimum set pressures, which are higher than the hydrogen dispensing protocol minimum pressure, are used to assure that a vehicle 5 is not filled if the initial pressure in the vehicle is less than the hydrogen dispensing protocol minimum.

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TITLE

Method for Assuring Compliance with Aspect of Hydrogen Dispensing Protocol J2601

ABSTRACT

[0001] Methods for assuring that a receiving tank having an initial pressure less than

the set minimum required by any hydrogen dispensing protocol, such as J2601, is not

violated. Alternative minimum set pressures, which are higher than the hydrogen

dispensing protocol minimum pressure, are used to assure that a vehicle is not filled if 5

the initial pressure in the vehicle is less than the hydrogen dispensing protocol minimum.

DESCRIPTION

[0002] The present disclosure relates to dispensing of hydrogen gas to receiving

vessels, such as fuel tanks on board vehicles. The present disclosure is more specifically 10

related to assuring compliance with the “empty tank test” for the J2601 hydrogen

dispensing protocol.

[0003] As part of the J2601 hydrogen dispensing protocol, dispensing to fuel tanks in

vehicles is not to take place if the fuel tank has an initial pressure less than a set

minimum, e.g. 0.5 MPa. 15

[0004] There is growing interest to use hydrogen as a transportation fuel in cars,

buses, trucks, and other vehicles. Hydrogen is generally stored in a fuel tank on board

the vehicles at high pressure. After most of the on-board hydrogen has been depleted,

the pressure of the hydrogen in the fuel tank is reduced and the fuel tank must be

refueled with hydrogen. 20

[0005] During refueling, hydrogen is dispensed into the fuel tank at a hydrogen

dispensing station. The dispensing station includes a hydrogen supply, which can be one

or more high pressure storage tanks, and/or liquid hydrogen that is converted to high

pressure hydrogen. Hydrogen is transferred from the high pressure storage tank into the

fuel tank of the vehicle. The driving force for transferring hydrogen is the pressure 25

difference between the high pressure storage tank and the vehicle fuel tank.

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[0006] Hydrogen dispensing units (stations) are used to dispense high pressure

hydrogen into hydrogen storage tanks in vehicles such as cars, buses, trucks, and

forklifts.

[0007] The transfer line between the high pressure storage tank and the fuel tank

typically includes various control valves, and block and bleed valves. A block valve 5

blocks the flow from the high pressure storage tank and a bleed valve allows a portion of

the hydrogen trapped between the block valve and the dispensing nozzle to discharge,

thereby reducing the pressure at the dispensing nozzle. Accepted standards, such as

SAE J2600 and ISO 17268, require that the pressure at the nozzle be less than 0.5 MPa

(gauge) before the dispensing nozzle can be disconnected from the fueling receptacle on 10

the vehicle.

[0008] A schematic of an exemplary hydrogen dispensing station is shown in the

figure. The figure shows a process flow diagram for a hydrogen dispensing unit.

[0009] The process flow diagram includes the dispensing unit 1 and receiving tank 118

of a vehicle. The present disclosure may be applied...