Post by cjm on Oct 19, 2022 15:43:05 GMT
Sasol, ArcelorMittal to jointly explore green hydrogen, carbon capture projects
casper1 1 day ago
LOL
The conversion of solar power to useable and store able electrical power is around 92% efficient and rising.
Converting solar to hydrogen you lose about 40% due to the conversion process alone and then you still lose more in the usage cycle dependent on the method employed.
Methinks this generation also never heard of the Hindenburg disaster !!!
LOL
The conversion of solar power to useable and store able electrical power is around 92% efficient and rising.
Converting solar to hydrogen you lose about 40% due to the conversion process alone and then you still lose more in the usage cycle dependent on the method employed.
Methinks this generation also never heard of the Hindenburg disaster !!!
Johan_Buys 23 hours ago
Casper:
A lot depends on how long you need energy storage for and how you use the embedded energy.
Making hydrogen is now cheap because the wind/solar cost per kWh is low – 40c/kWh is easy. It doesn’t really matter if after even poor conversion your energy is costing 60c/kWh as that is half what coal kWh costs. AND your 60c energy is clean.
Storing that as hydrogen for long periods is not easy (compared say diesel) but storing and transporting it as ammonia is easy. That also where carbon capture comes in…
Using it only for electricity is not very efficient (same for diesel or oil) but when you have an industrial use for the heat byproduct, it makes sense. Sasol and Mittal use a lot of heat. Fuel cells your byproduct would I think be the heat plus water – also key.
If they can combine 40c/kWh input cost wind and solar, capture what are unpopular byproducts of their process, and then use the fuel, it could make a lot of sense, doubly so if it adds to their non-Eskom dependence :/
Casper:
A lot depends on how long you need energy storage for and how you use the embedded energy.
Making hydrogen is now cheap because the wind/solar cost per kWh is low – 40c/kWh is easy. It doesn’t really matter if after even poor conversion your energy is costing 60c/kWh as that is half what coal kWh costs. AND your 60c energy is clean.
Storing that as hydrogen for long periods is not easy (compared say diesel) but storing and transporting it as ammonia is easy. That also where carbon capture comes in…
Using it only for electricity is not very efficient (same for diesel or oil) but when you have an industrial use for the heat byproduct, it makes sense. Sasol and Mittal use a lot of heat. Fuel cells your byproduct would I think be the heat plus water – also key.
If they can combine 40c/kWh input cost wind and solar, capture what are unpopular byproducts of their process, and then use the fuel, it could make a lot of sense, doubly so if it adds to their non-Eskom dependence :/