Tier 2 and Tier 3/Tier 3 Stage 4 Emissions

[skobylenski]

Can you point us to a link at the EPA website?



As an aside, a Diesel Technology degree sounds very cool. What are your plans after school?



-Ryan

I don't have any website link unfortunately, although I beleve the Powerpoint we were viewing was put out by the EPA a few months ago. I'm just giving the facts that we were given, and we were told that Cat is working on urea systems, however I won't argue with RoadGoes, since he does work for Cat, and I would assume knows what he's talking about. Maybe whoever created the entire slideshow was mistaken? Who knows, it is the government



Anyway, Ryan, to answer your question, I'll be working for about 6 months, then I'm signed up to spend another 18 or so months at Ohio Technical College in Cleveland so I can get an ASE certification in Diesel Equipment Technology, and I might do the power generation systems program as well. After that, I have no idea what I'm going to do

 

[rbattelle]

After that, I have no idea what I'm going to do

Ahhh, there are few things more wonderful than a wide-open future. Best of luck.



-Ryan

 

[NoSeeUm]

NOx is not produced just by burning more fuel. Nitrogen and oxygen are both elements that come from the air going in the engine. Burning more fuel alone does not add more nitrogen or oxygen. Also, all emissions numbers that the EPA looks at are a brake specific calculation. In other words, it is how much emissions the engine produces per hp*hr, so to meet the laws, if an engine made more NOx at a given point, it would have to make more power too, so no, the overal NOx output is less for each incremental change in regulations. Hope that makes sense.

Well said, regulation changes usually are hard to understand.



The rate of NOx production is really a function of combustion temperature for a given fuel burn rate (fuel flow rate). The higher the temperature the higher the rate of NOx production. Consequently, the lower the temperature the higher the rate of CO production. Combustion temperature control is pretty much a balancing act of give and take.



Irregardless, even under optimum conditions more fuel is more NOx. The concentration can be held more or less constant with combustion controls, but the NOx flow rate is generally portional to fuel flow rate. Increase the fuel gph and you increase the NOx pph. The amount of BHp produced does not matter at all, it has only to do with the combustion of fuel. BHp is a side effect.



EGR reduces the available O2 for combustion and so reduces the combustion temperature. This IMO is the poor mans solution to reducing NOx and like was said before reduces power output for a given amount of fuel.



Ammonia injection into a SCR on a moving vehicle will just be nasty in about any form. Although, you can get a 5 to 1 NOx reduction pretty easy. I think thats probably why it is being considered.



Jim