gmsl cng equipment

7/29/2019 GMSL CNG Equipment

http://slidepdf.com/reader/full/gmsl-cng-equipment 1/23

MOTHER-DAUGHTER STATION

1GAS MINT SYSTEMS LTD

Concept

A Mother-Daughter CNG system is a combination of equipment that delivers compressed

natural gas (CNG) from an area serviced by a gas pipeline to another area that is notserviced by a gas pipeline, through the use of compressors and mobile gas storagetrailers.

The basic concept is to compress the gas at a high-capacity compressor (Mother) station

and transport it in storage trailers to one or more booster (Daughter) stations, where itis dispensed to fill vehicles or used for residential/commercial/industrial applications.

Mother-Daughter systems are used in areas where the pipeline infrastructure does notreach the areas that require the delivery of CNG fuel to vehicles and other natural gas

end-users.




Mother Station Flow Chart



Mother Station


The Mother station typically consists of two or more high-capacity CNG compressorsdesigned to fill large mobile storage trailers, but may also have the ability to directly fillvehicles as well. The use of two or more high-capacity compressors provides high flow

capacity as well as system redundancy.

A gas dryer may be used upstream of the compressor if the moisture content of thepipeline gas is too high.

Depending on the use of the station, the gas is either compressed directly to a mobilestorage trailer or a waiting vehicle. For vehicle filling, a priority panel, storage system,and dispenser is required. To fill the mobile storage trailers, a high-capacity fill post isused which has a flexible fill hose, valves and a nozzle to connect the compressordischarge gas to the trailer inlet. These trailers can be filled to 3600 psig

(approximately 250 barg), in order to maximize their carrying capacity. This pressuremay be higher or lower depending on local regulations and the pressure rating of thestorage cylinders.



CNG Mother Station


Gas Engine driven Mother Station



CNG Mother Station


Electric motor driven Mother Station




CNG Mother Station



The Storage Trailers


CNG Transportation tube trailer





CNG Transportation tube loading station



The Storage Tubes


CNG Transportation tubes



The CNG Storage


CNG Ground Storage tubes



The CNG Storage





The CNG Storage Tube Trailers


The CNG storage tubes trailers used to transport the gas are generally made up of

cylinders manifold together as a single storage buffer, whereas stationary storagesystems used at CNG stations are usually made up of cylinders joined into three (3)separate banks: low, medium and high.

Because gas that is transported in mobile storage trailers may require pressure

boosting at the Daughter station. As the gas in the trailer is utilized and thepressure diminishes, it can be diverted through the booster compressor to elevatethe pressure to 3600 psig, then sent to either the dispenser or the stationarystorage system, which is split into two banks (medium and high). In this fashion, byutilizing the storage trailer as Low Bank storage, the Daughter station can operate

as a normal three-bank, fast-fill station.



CNG Dispensers




GAS COMPRESSION AND STORAGE




Daughter Station


The compressor used at a Daughter station can be classified as a booster compressor.It requires only one or two stages of compression since the supply gas (from the mobilestorage trailer) is already at an elevated pressure (435 ~ 3600 psig / 30 ~ 250 barg).

The Daughter system is able to use the full pressure available from the trailer (withoutpressure regulation) making the system the most efficient, since it is capitalizing on thepotential energy already stored in the mobile trailer gas.

Whenever the gas in the storage trailer is higher than the onboard pressure of thevehicle, gas can flow directly from the trailer to the vehicle (or to the ground storage if the pressure is below that of the trailer and no vehicles are filling).

Once the trailer pressure drops below 3000 psig, gas flows through the compressor tobe boosted back up to 3600 psig. Even during compression, gas can continue to flowdirectly from the trailer to the vehicle, emulating Low Bank storage.



Daughter Station (Cont.)


There is also a minimum pressure that the storage trailer should be drawn down tobefore it becomes inefficient to remove more gas. If you use your mobile storage trailer

down to 435 psig, you are removing approximately 90% of the gas by volume.The Daughter compressors can easily operate at a suction pressure of 435 psig, whichprovides the following benefits:

a) Decreases the loss of potential energy in the stored gas

b) Allows the use of a lower cost two-stage booster compressor

c) Eliminates the need for suction pressure regulation

d) Eliminates the need for reheating the depressurized gas (due to extreme cooling)

e) Simplifies the system and lowers the purchase and maintenance costs



GAS COMPRESSION AND STORAGE




CNG Daughter Station




GAS UTILIZATION


BUSES,LORRIES,TRAILERS, TRUCK,

CARS e.t.c

Industrial Consumptionfor Boilers & Generators

CNG DAUGHTER

STATION i.e.CNG FILLING STATION

HOTELCONSUMPTION

HOUSEHOLDCONSUMPTION

MOTHER STATION




www.gasmint.com

Shola Olanisebe

[email protected] [email protected]

08086848071

08033256185

Gas Mint Systems Ltd

22 Road, E Close, Block 2, Flat 1 Festac Town, Lagos State

Tel: 01-801 2763 E-mail: [email protected]

Our Contact

gmsl cng equipment

Documents