Hi guys,
I just joined the forum and I really hope there is someone out there who can help me. I am so confused. It's a long read but by the time you get to the bottom you will have learned something new so bear with me.....
I have put my money into a technology that looks very promising. It's a startup company run by a veteran chemist who really knows her stuff. I am marketing the product but whenever I question what she tells me she gets very offended that I would dare ask, so I thought better I post here.
This is a basic summary of the product:
On site:
1) water tank
2) methanol fuel tank
3) air compressor
4) Our device, the fuel pro (http://fuels.pro)
5) 220v power supply
6) Customer's engine (stationary, not in a small vehicle)
How it works:
1) User starts the Fuel Pro by turning on 220V switch
2) it warms up (typical 35 minutes)
2) After warming up methanol and water are drawn into the Fuel Pro.
3) Air is pumped in via the air compressor
4) The Fuel Pro processes the ingredients into an output gas: 37% H2, 18.5% CO2 and CO, 44.5% N2
5) This gas comes out of a tube from the fuel pro and enters the engine air intake
6) The gas displaces some air and some diesel that would normally enter the engine cylinder
7) Because air is displaced from the engine, in particular oxygen there is less opportunity for toxic nitrous oxides to form (NO and NO2 referred to as NOx). This happens when nitrogen and oxygen are present at high temperatures and high pressure
8) The hydrogen and CO burn together with diesel and air
9) Because hydrogen burns much hotter and faster than diesel the following happens:
- the combustion works well because hydrogen much needs less oxygen than diesel to burn
- any diesel present burns with the air that is not displaced by the Fuel Pro gas
- The combustion happens faster and at the peak of the engine compression stroke because of the rapid speed of hydrogen combustion. Diesel normally burns slower and hence the more diesel is displaced the faster the explosion and better the engine efficiency.
- lower NOx is created
- because there is less diesel less of another pollutant, particulate matter is created
The result is, claims the manufacturer: A more efficient engine, lower emissions, greater fuel economy.
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Ok that's the theory. I have seen NOx numbers and perhaps they were cherry picked at low engine temperature but they look very very good, so I am not concerned about the deNOx effect. Although some academic research shows at high engine temperature/load NOx increases in hydrogen augmented systems, all the results from our system look fantastic.
What I am confused about is the manufacturer claim that reforming the methanol into hydrogen + inert gases and adding it to the diesel engine results in vastly superior combustion to the extent that 1 litre of methanol once reformed into this gas can substitute for 3 litres of diesel. I have asked repeatedly about this and I only succeeded in making the expert very angry. The claim is based on a table which shows that hydrogen's fuel/air heat energy is more than double that of diesel for a cubic metre. This confuses me from the beginning because I assume a cubic metre of hydrogen is measured at room temperature and diesel is a liquid at room temperature so we can't be talking about cubic metres of diesel as a gas. Nevertheless I am in possession of a table which gives the following numbers :
Hydrogen intrinsic energy 10800 kJ/m3, Hydrogen fuel/air heat energy 10930 kJ/m3
No figure for diesel but a figure for gasoline which has a very similar intrinsic energy:
Gasoline intrinsic energy 44000 kJ/Kg, Gasoline fuel/air heat energy 3720 kJ/m3
So supposedly the gasoline doesn't release close to its intrinsic energy when it burns with air.....? But note the Gasoline intrinsic energy is in Kg and the fuel/air energy is in m3. Apples with oranges?
If anyone can clear that up it would be wonderful, but let's continue....
I have seen other threads here on CR4 where people have claimed a little hydrogen can lead to up to a 30% increase in fuel efficiency, and this is NOT through substitution as claimed by my manufacturer. They claim is't something akin to hydrogen being a catalyst that helps the diesel fuel burn better. In other words a little hydrogen will help but more will not. Any comments to this? Would it make any difference that we are injecting also inert gases and our hydrogen will always be diluted, perhaps overcoming the issue of flooding the engine with too much hydrogen.
And finally now the juicy part. The reformers are now under construction. You can be sure I will get one tested as soon as it's ready. I need to design a rig where I bring an engine, probably a diesel generator. To design this test I need help!
THE TEST:
My plan is to rent an 80kW generator and set it to run at 75% and then to inject our reformate gas via air intake. When the gas is added the engine governor should return unused diesel so I should be able to measure the substitution rate of reformate gas for diesel.
What I am not sure about is:
- Measuring the fuel flow. How is this normally done? I have seen there are such things as fuel flow meters. Where is this connected? I suppose in the fuel line going into and returning from the engine.
- How to ensure the work done by the engine is constant. It should run at constant speed because of the governor, but does this mean constant load and hence constant work? Is it normal to measure the load somehow to prove the work done? How to load it? A brake? Get it to run some electrical heaters at full output?
- How best to conduct the test? Weigh the diesel at the start and at the end in scenario 1? And weigh the methanol and diesel at the start and end of scenario 2? Run the tests for equal periods of time?
- the generator size. The manufacturer was testing on a 1.2L plain vanilla Nissan engine about 10 years old. I looked up figures for a similar 1.2L engine and I guess it would be around 45kW. Nissan claims 5.5L per 100km which I guess is around 1800 rpm ... 30% of max load? Unloaded in our factory engine ran an hour at 2000 RPM using gas from around 1.3L of methanol. The fuel pro consumes 5.5L at normal capacity meaning it will need an engine 4x the size (but remember the engine was not loaded in the factory). Finally when I rent a generator the power output is KVA of electrical energy. Can I compare this with the kW of a road engine quoted by Nissan? I understand there are some losses converting the power to electricity.
Any help designing this test would be wonderful :)
Apologies for the length of the post but now it's all in there. Go at it.
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