1) H2 is mixed into the gas pipeline and thus is burnt along with the methane (cause they are mixed ;-) ) 2) An Itm stack uses electricity to turn water into H2 and O2. There is no gas mix passing over ITM's stack. 3) There are fuel cells that take H2 and O2 and convert back to water releasing the energy that they are fuel cells as in a Toyota car. Efficiencies in the 70 to 80% which is way above that generated in say a car (30% region being normal) 4) Point being, sorry I lost you? 5) I think you mean can you reclaim H2 from the gas grid. Not sure why you want to and what the benefit would be, there are technologies that do this but why, seems to me you either want H2 in which case you store it or you want burnable gas in which case a H2 CH4 mix sounds good to me.
I think there is a good argument to store H2 pure and release it via a fuel cell back into the electricity grid, certainly the efficiencies are there, but you would need a lot of storage which is where the methane grid comes in, it is already built and they already have turbines and electrical grids joined up. However as the idea of the intelligent grid becomes more the norm, small generators become more sensible. So we are still a bit chicken and egg here.
Interestingly Germany are further down the road on energy storage than the UK is but less far down the road on the intelligent grid so I suspect we both have to catch up. Germany has a history of building localised water storage plants for electricity storage. I guess which is why they are leading the field on H2 storage in CH4.
Anyone know? When the excess power is converted to hydrogen and stored in the Gas Grid, is that gas burned along with the methane? (Thats OK with me). But I saw something unclear that implied (seemed maybe perhaps) that that gas mix passed over an ITM stack could produce more electricity (though it would be extremely inefficient). Point being, you suddenly have electricity demand (eg when work starts) and this provides it. I'm only referring to reclaiming power from the gas grid. Seems doubtful. Anyone know?
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