Explain please...

 

emissions reducer?

Explain please...

 

emissions reducer?

 SCR http://https://en.wikipedia.org/wiki/Selective_catalytic_reduction

 

Very popular in coal fired power stations at the moment, along with SNCR, primarily for reducing Nox emissions.

 

Don't ask me any more, that's all I know

https://en.wikipedia.org/wiki/Diesel_exhaust_fluid

Basically water injection.....wow, donkey years old, reduces combustion temperatures............

 

nothing new is there

 

 

Diesel exhaust fluid (DEF) is an aqueous urea solution made with 32.5% urea and 67.5% deionized water

 

 

Urea or carbamide (from the Greek word Ουρία) is an organic compound with the chemical formula CO(NH₂)₂. The molecule has two —NH₂ groups joined by a carbonyl (C=O) functional group.

 

NH2 is mainly nitrogen+hydrogen

Edited 19 January, 201610 yr by lichfielddriver

No, not really.  The adblue goes nowhere near the combustion chambers.

 

Problem: Nitrogen, at very high temperatures reacts (in the combustion chambers) with excess oxygen with undesirable results (nitrogen oxides).

 

Reacting those nitrogen oxides with adblue, in a special catalytic converter downstream, well outside the engine, can convert those nitrogen oxides back into harmless nitrogen and oxygen, and water vapour. Problem solved.

Edited 19 January, 201610 yr by Wino

Thought it was added t the fuel?

 

 

No, not really.  The adblue goes nowhere near the combustion chambers.

 

 

No.

Thought it was added t the fuel?

 

Early ford DPFs used a really crude system that dosed the fuel tank every time you opened and closed the fuel cap with fluid. I think they have moved away from that now because it was rubbish

We're getting AdBlue and Eolys fluid mixed up here. 

 

AdBlue is a Urea additive that is injected into the exhaust gases to reduce the NOx levels, as Wino explains above. Also knows as 'Selective Catalytic Reduction', or SCR as there is an additional catalytic converter downstream of the AdBlue injector. It doesn't go anywhere near the fuel or engine. 

 

Eolys (or whatever it might be called by certain manufacturers) is a fuel additive that reduces the required temperature a DPF has to achieve in order to perform a regeneration. It's also referred to as a fuel borne catalyst additive, or FBC. 

 

It's popular with the PSA group which consists of Citroen, Peugeot and certain Ford diesel engines. VAG use it on certain vehicles, like the PD140 Superb.

 

I think it's falling out of favour as the newer close-coupled Cat/DPF assemblies mean higher regen. temperatures can be achieved without the need to add Eolys. 

Actually if you got a car with Adblue, it can be mapped out (just like EGR, DPF or similar things). I talked to a garage guy and he said that these Adblue things cause lots of trouble. He told me about numerous cases with Adblue related problems (often it happens after warranty period is expired). You see a warning flashing and you think that Adblue tank is empty. Actually it isn't and even filling it doesn't help. Something else in the whole system is to blame - sensors, Adblue injectors, pump, electronics etc. And all this stuff costs a fortune...

That's just one reason why i've opted for the extended warranty package. These emission control devices can be a pain - until the technology matures. 

 

DPFs are a mature technology these days, AdBlue SCR systems will follow.....

AdBlue is probably as mature a technology as DPFs - in Europe, inc the UK, it has been fitted to virtually every HGV, Bus and even some trains for at least 12 years.

"AdBlue is a Urea additive that is injected into the exhaust gases to reduce the NOx levels"

 

To cool the gases or just the cat?

It's not to cool either the gases or the cat, it's a suitable substance to *react with* nitrogen oxides on the surfaces of the (special) catalytic converter to reduce those oxides back to nitrogen gas, oxygen gas, and water vapour.

A few videos that might help explain what's going on with the exhaust gases and what AdBlue is all about. 

 

 

 

The second video is all about some oddball brand called Owdie or something  :p

Edited 21 January, 201610 yr by dstev2000

I've got the mk5 mondeo euro 6 diesel and it doesn't have adblue

You don't need to use AdBlue to achieve Euro6 compliance. Other methods such as increased EGR and a lean NOx trap can get the levels below the EU6 requirements. 

 

The CR150 engine is EU6 and doesn't use AdBlue. The 'SCR' next to the list of available engines in the brochure shows which ones use AdBlue. I believe that includes the CR190 and Greenline CR120. 

Edited 24 January, 201610 yr by dstev2000

I was chatting the other day to a contact at a lubricant manufacturer that also retails Adblue. Apparently one of the biggest concerns with Adblue is behavioural as there have been many problems with users not knowing what to do with it when asked by the car to top up the reservoir as people don't read the manual. A significant number of new users pour it in the fuel tank, the washer bottle, the coolant reservoir (particularly in those cars with blue/green antifreeze) and even into the engine itself via the filler cap or down the dipstick hole.      I guess they are the kind of mistakes that we only make once.

I'm impressed with the adblue range estimate on my 190ps superb. Today it's telling me 4k miles to go, it started at 9k miles. I've only driven it for just over 3k. I've not checked how much it costs but unimpressed so far

Sent from my E6653 using Tapatalk

I'm impressed with the adblue range estimate on my 190ps superb. Today it's telling me 4k miles to go, it started at 9k miles. I've only driven it for just over 3k. I've not checked how much it costs but unimpressed so far

Sent from my E6653 using Tapatalk

Your car will be one with the 'cheat device' deactivated I assume, or never built into the vehicle. Maybe free Adblue refills will be available at VWG Dealerships in the EU.

Your car will be one with the 'cheat device' deactivated I assume, or never built into the vehicle. Maybe free Adblue refills will be available at VWG Dealerships in the EU.

The latest cars with the Euro 6 Adblue engine shouldn't have the "cheat device" anyway. That was the EA189 Euro 5 engine.

Exactly

The Defeat Device (Cheat) on the Euro 5's had them sipping the Adblue.   Without the cheats, drinking like they are alkies.

But my car is Euro 5 and it doesn't have adblue, as far as I know none of the EA189 engines have adblue. They rely on the particulate filter.

Good, so no wuckin furries there.

 You just have the Cheat Device.  

Your future expense might only be the DPF replacement, or have Skoda (VW) pay for that.