RE: Really??17 Jan 2019 15:30
Seadangler, fuel cell cars aren't economic yet. How long, who knows and maintenance reliability etc etc. Thats why the hybrid/full electric is the most prevelent.
Fuel stations in the uk are starting to have H2 installed as well as H2 tanker burns less fuel than a 40TonnerGaseous hydrogen can be transported in small to medium quantities in compressed gas containers by lorry. For transporting larger volumes, several pressurized gas cylinders or tubes are bundled together on so-called CGH 2 tube trailers. The large tubes are bundled together inside a protective frame.
The tubes are usually made of steel and have a high net weight. This can lead to mass-related transport restrictions. The newest pressurized storage systems use lighter composite storage containers for lorry transport.
The low density of hydrogen also has an impact on its transport: under standard conditions (1.013 bar and 0°C), hydrogen has a density of 0.0899 kg per cubic meter (m3), also called normal cubic meter (Nm3 ). If hydrogen is compressed to 200 bar, the density under standard conditions increases to 15.6 kg hydrogen per cubic meter, and at 500 bar it would reach 33 kg H 2 /m3.
A tube trailer cannot store compressed gas as compactly as a tanker for liquid fuels (petrol or diesel fuel). This means that the available tank volume for hydrogen per tanker is lower. Single tube trailers carry approximately 500 kg of hydrogen, depending on the pressure and container material.
The largest tank volumes for gaseous hydrogen transport are currently 26 cubic meters. Taking account of the low hydrogen density factor at 500 bar, this results in a load of around 1,100 kg hydrogen per lorry. This figure extrapolates to approximately 12,000 normal cubic meters of hydrogen. At 250 bar both the weight of hydrogen and its transport volume in Nm 3 would be roughly halved.Liquid Transport
As an alternative, hydrogen can be transported in liquid form in lorries or other means of transport. In comparison to pressure gas vessels, more hydrogen can be carried with an LH 2 trailer, as the density of liquid hydrogen is higher than that of gaseous hydrogen. Since the density even of liquid hydrogen is well below that of liquid fuels, at approx. 800 kg/m 3 , in this case too only relatively moderate masses of hydrogen are transported. At a density of 70.8 kg/m3 , around 3,500 kg of liquid hydrogen or almost 40,000 Nm 3 can be carried at a loading volume of 50 m3. Over longer distances it is usually more cost-effective to transport hydrogen in liquid form, since a liquid hydrogen tank can hold substantially more hydrogen than a pressurized gas tank. For the purposes of liquid transport the hydrogen is loaded into insulated cryogenic tanks. LH 2 trailers have a range of approximately 4,000 km. Over the journey time the cryogenic hydrogen heats up, causing the pressure in the container to rise.
TBC