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Post by Baron von Lotsov on Nov 25, 2022 20:52:17 GMT
Use hydrogen generated by huge wind turbines and solar farms. China is currently moving into the green hydrogen business in a massive way. The Gobi desert get a lot of sun and land is cheap there.
The professor's arguments are misinformed. China, as always, is one step ahead.
Hydrogen is 3x the energy of petrol and it burns to produce water.
Yes, BVL, but this is just making the diesel mistake again. We were told by our politicians to change to diesels because they generate slightly less CO2 than petrol (because of the slightly higher efficiency of their high compression engines). Then they belatedly realised that higher compression ratios mean that they burn fuel at a higher temperature - high enough to cause the oxidation of the nitrogen in the atmosphere. So it cut CO2 but it generated far more NOX (NO2 in particular) which is poisonous. Unfortunately hydrogen is exactly the same deal. If you burn it you get no CO2 but because it burns at an even higher temperature you get vast amounts of NOX. However green hydrogen is a very good way of storing the renewable energy generated by solar and wind. It's much cheaper than batteries and much greener. If our government were to actually think about their energy policy what they would be doing is storing renewable energy in hydrogen and using that hydrogen in hydrogen fuel cell electric cars - and abandoning BEVs which are less green than petrol. Will they do it? Of course not. They get EVERYTHING wrong. NOx is only produced in quantity above 1300C. It has to split the N2. No nitrogen in hydrogen fuel.
Unfortunately fuel cells use rare elements like palladium.
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Post by steppenwolf on Nov 26, 2022 7:22:16 GMT
Yes, BVL, but this is just making the diesel mistake again. We were told by our politicians to change to diesels because they generate slightly less CO2 than petrol (because of the slightly higher efficiency of their high compression engines). Then they belatedly realised that higher compression ratios mean that they burn fuel at a higher temperature - high enough to cause the oxidation of the nitrogen in the atmosphere. So it cut CO2 but it generated far more NOX (NO2 in particular) which is poisonous. Unfortunately hydrogen is exactly the same deal. If you burn it you get no CO2 but because it burns at an even higher temperature you get vast amounts of NOX. However green hydrogen is a very good way of storing the renewable energy generated by solar and wind. It's much cheaper than batteries and much greener. If our government were to actually think about their energy policy what they would be doing is storing renewable energy in hydrogen and using that hydrogen in hydrogen fuel cell electric cars - and abandoning BEVs which are less green than petrol. Will they do it? Of course not. They get EVERYTHING wrong. NOx is only produced in quantity above 1300C. It has to split the N2. No nitrogen in hydrogen fuel.
Unfortunately fuel cells use rare elements like palladium.
There's obviously no nitrogen in hydrogen fuel (or carbon) but if you burn hydrogen in air (which is predominantly nitrogen) you end up with more NOX than from a diesel engine. HFCs use rare elements but in limited quantities. Li ion batteries use vast amounts of Li and Co which are also relatively rare and also highly toxic. |
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Post by Baron von Lotsov on Nov 26, 2022 11:48:21 GMT
NOx is only produced in quantity above 1300C. It has to split the N2. No nitrogen in hydrogen fuel.
Unfortunately fuel cells use rare elements like palladium.
There's obviously no nitrogen in hydrogen fuel (or carbon) but if you burn hydrogen in air (which is predominantly nitrogen) you end up with more NOX than from a diesel engine. HFCs use rare elements but in limited quantities. Li ion batteries use vast amounts of Li and Co which are also relatively rare and also highly toxic. There are other technologies. There are sodium batteries and also flow batteries. The sodium ones are nowhere near as energy dense but due to the cheapness they may be OK for storing energy for buildings. With flow batteries after their useful life you just recycle the electrolyte and they are then as good as new.
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