Hydrogen engines can deliver over 99% reduction in carbon emissions, making them a promising technology for decarbonizing commercial transportation.If green hydrogen is used, these vehicles will also have low to zero “well-to-pump” greenhouse gas emissions.Well-to-pump emissions are the greenhouse gas emissions from the extraction, processing, transportation, and manufacturing of fuel up until it is dispensed at a fuel station.Gray hydrogen has high well-to-pump emissions. It’s made from methane using a common industrial process. Therefore, gray hydrogen shouldn’t be used to reduce a vehicle’s greenhouse gas emissions.Green hydrogen, in contrast, is made using processes that don’t release any greenhouse gases. The electrolysis of water using renewable energy, for example, is a way to manufacture green hydrogen.

Hydrogen engines can deliver over 99% reduction in carbon emissions, making them a promising technology for decarbonizing commercial transportation.
If green hydrogen is used, these vehicles will also have low to zero “well-to-pump” greenhouse gas emissions.
Well-to-pump emissions are the greenhouse gas emissions from the extraction, processing, transportation, and manufacturing of fuel up until it is dispensed at a fuel station.
Gray hydrogen has high well-to-pump emissions. It’s made from methane using a common industrial process. Therefore, gray hydrogen shouldn’t be used to reduce a vehicle’s greenhouse gas emissions.
Green hydrogen, in contrast, is made using processes that don’t release any greenhouse gases. The electrolysis of water using renewable energy, for example, is a way to manufacture green hydrogen.
No fuel is totally free of well-to-pump greenhouse gas emissions. It’s impossible to fully decarbonize all activities connected to supplying fuel. Green hydrogen, though, comes as close to being zero-carbon as any fuel can.
Hydrogen engines and emissions of common air pollutants 
Hydrogen combustion product is primary water vapor, simply because hydrogen fuel doesn’t have other elements such as carbon or sulfur. With hydrogen engines specifically, there are no carbon emissions from the fuel itself. Moreover, when green hydrogen is used, there are also no greenhouse gas emissions from the production of hydrogen fuel.
Hydrogen engines can produce small amounts of NOx during combustion, which can be controlled with an after treatment system.
Manufacturing and operating hydrogen engines with existing resources
Hydrogen engines are a more environmentally friendly and practical option for many commercial applications than hydrogen fuel cells. For example, hydrogen buses can refuel each night using fueling stations located at the central bus depot.
Inevitably, the use of hydrogen engines in medium and heavy-duty applications will lead to a greater availability of green hydrogen. It will also drive  scale in the manufacture of hydrogen storage components used in other hydrogen technologies. As a result, hydrogen engines are well-positioned to prime the hydrogen economy and, indirectly, accelerate the pace of decarbonization.
MJF Lion ER YK Sharma 

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