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Compressed Gas Dispensing Methods

IP.com Disclosure Number: IPCOM000250129D
Publication Date: 2017-Jun-02
Document File: 5 page(s) / 72K

Publishing Venue

The IP.com Prior Art Database

Abstract

A first compressed gas dispensing method where the source of compressed gas to the compressor is changed depending on a measured suction pressure and/or temperature of the compressed gas discharged from the compressor. A second compressed gas dispensing method where the flow rate of a cooling fluid, which is used to cool the compressed gas during dispensing, is varied depending on whether compressed gas is being dispensed or not being dispensed.

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Compressed Gas Dispensing Methods

Abstract

A first compressed gas dispensing method where the source of compressed gas to the

compressor is changed depending on a measured suction pressure and/or temperature of the

compressed gas discharged from the compressor. A second compressed gas dispensing method where

the flow rate of a cooling fluid, which is used to cool the compressed gas during dispensing, is varied

depending on whether compressed gas is being dispensed or not being dispensed.

Detailed Description

The methods described in this disclosure relate to dispensing of compressed gases, for example,

dispensing of hydrogen to vehicles.

The first method relates to dispensing compressed gas from a plurality of compressed gas

supply tanks via a gas compressor to a receiving tank. The first method relates more specifically to

switchover criteria for switching the source of compressed gas to the compressor.

Compressors have various design operating limitations, such as the minimum suction pressure

at the inlet, maximum discharge pressure, and maximum discharge temperature. Often, compressors

are designed to automatically shut down if any of the design operating limitations are violated. In the

first method, automatic shutdown is avoided by switching the source of compressed gas as a function of

any of the design operating limitations for a gas compressor.

FIG. 1 is a process flow diagram of a compressed gas dispensing system showing four

compressed gas supply vessels, 1, 2, 3, and 4, a compressor 5, and a receiving vessel 6. Any number of

compressed gas supply vessels may be used. The receiving vessel 6 may be the storage tank on-board a

vehicle or high pressure storage vessel of a compressed gas dispensing station where compressed gas is

dispensed from the high pressure storage vessel to a storage tank on-board a vehicle.

The compressed gas supply vessels 1, 2, 3, and 4 may be initially provided with compressed gas

at the same pressure in each of the compressed gas supply vessels. Alternatively, the pressure in each of

compressed gas supply vessels 1, 2, 3, and 4 may have compressed gas at different pressures. The

pressure of the compressed gas in each of the compressed gas supply vessels may be measured using

pressure sensors (not shown) with signals from the pressure sensors being sent to a controller 7.

In the first method, a valve associated with a first compressed gas supply vessel 1 is opened and

compressed gas is passed from the first compressed gas supply vessel 1 to compressor 5. The pressure

of the compressed gas at the inlet to the compressor (i.e. the suction pressure) is measured by a

pressure sensor 8.

The compressed gas is compressed in compressor 5 and passed to receiving vessel 6. The

temperature of the compressed gas withdrawn from the compressor 5 is measured by temperature

sensor 9 and the pressure of the compressed gas withdrawn from the compressor 5 is measured by

pressure sensor 10.

The pressure sensor 8, temperature sens...