Design of Onboard Vehicle H2 Fuel Tanks

Because of its very low density, both as a gas or as a liquid, the design of the vehicle fuel tank for a range of >300 miles from one fill is a real challenge.

The systems proposed are:

• A high pressure composite tank with pressure up to 700 bar;

• Liquid hydrogen storage tank which is vacuum super insulated;

• A metallic hydride storage that requires heat transfer during the filling and H2 fuel use cycles;

• A chemical agent that will release hydrogen but then will require regeneration; and

• Carbon-based adsorbents used as a storage medium.

Flammability Limits

-50— Automotive Spark Plug 20

10j- Human Spark

Brush Discharge

Common Static

Fig. 16. Ignition energy of H2, CH4 and gasoline with air

The first two systems are most likely to be used in practice. Figure 17 shows the characteristics of the various storage methods expressed as MJ/litre of tank volume and wt% H2. The US Department of Energy goal of 6 wt% hydrogen can be achieved with a well designed liquid hydrogen tank. Figure 18 shows an example of a liquid hydrogen tank from a BMW car.

Fig. 17. Gravimetric and volumetric storage densities of on-board hydrogen storage vessel systems

Oxygen And Acc Storage Board Vessels
Fig. 18. Passenger Car Liquid H2 Tank (BMW Clean Energy Car)

Fig. 17. Gravimetric and volumetric storage densities of on-board hydrogen storage vessel systems

Oxygen

Coal Water -

Steam

Air Feed

100 bar

Steam

Steam

Oxygen

Coal Water -

Coal

Shift reactors and

Gasification

steam generation

t

Water

Steam

Steam

Air Feed

Gas Turbine

CO2 Recovery

Power

380 MW

H2

220,000 Nm3/hr

Steam

*■ Power

Heat Recovery

Fig. 19. CO2-free power and hydrogen from coal-fuelled system

Gas Turbine

Steam Turbines

Power

Water

Fig. 19. CO2-free power and hydrogen from coal-fuelled system

Guide to Alternative Fuels

Guide to Alternative Fuels

Your Alternative Fuel Solution for Saving Money, Reducing Oil Dependency, and Helping the Planet. Ethanol is an alternative to gasoline. The use of ethanol has been demonstrated to reduce greenhouse emissions slightly as compared to gasoline. Through this ebook, you are going to learn what you will need to know why choosing an alternative fuel may benefit you and your future.

Get My Free Ebook


Post a comment