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🌐 How BlueD+ Works (AUS32 & AUS40)

BlueD+ (AUS32 and AUS40) is used in engines equipped with SCR – Selective Catalytic Reduction systems.
SCR is an advanced emission-control process designed to significantly reduce NOx (nitrogen oxide) emissions from diesel engines.

Whether it’s Euro 4/5/6 trucks on the road or marine engines at sea, the process works the same way:

🔵 1. Injection Into the Exhaust

BlueD+ fluid is not added to the engine or fuel.
Instead, it is injected into the hot exhaust stream before the SCR catalyst.

  • AUS32 → for trucks, buses, machinery with SCR

  • AUS40 → for marine engines & large industrial diesel systems with SCR

🔵 2. Conversion Into Ammonia

The heat of the exhaust breaks down the urea solution into ammonia (NH₃).

  • AUS32 = 32.5% urea

  • AUS40 = 40% urea
    Higher urea concentration in AUS40 suits the higher exhaust flow of marine engines.

🔵 3. NOx Reduction Inside the SCR Catalyst

Inside the SCR catalyst, ammonia reacts with harmful NOx gases.

NOx + NH₃ → Nitrogen (N₂) + Water Vapour (H₂O)

These are harmless and naturally found in the earth’s atmosphere.

This chemical reaction results in:

  • Up to 90% NOx reduction

  • Cleaner emissions

  • Compliance with Euro 4, 5, 6 & IMO Tier III standards

🔵 4. Continuous Monitoring by Sensors

Modern SCR systems use:

  • NOx sensors

  • Temperature sensors

  • Pressure sensors

  • DEF dosing control modules

These ensure:

  • Correct injection amount

  • Maximum emission reduction

  • No ammonia slip

  • Engine protection

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