Diesel Exhaust Fluid: Difference between revisions
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=Basics= | =Basics= | ||
*Often abbreviated as DEF | *Often abbreviated as DEF | ||
*A Consumable Fluid Used for [[Selective Catalytic Reduction]] (SCR) systems (essentially wet scrubbers/gas-liquid contactors) mainly on portable diesel engines to reduce NOx emmissions | *A Consumable Fluid Used for [[Selective Catalytic Reduction]] (SCR) systems (essentially wet scrubbers/gas-liquid contactors, but scaled down) mainly on portable diesel engines to reduce NOx emmissions | ||
*Is essentially an aqueous urea solution | *Is essentially an aqueous urea solution | ||
*According to wikipedia: | *According to wikipedia: | ||
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*Most consumers get it in small disposable tanks | *Most consumers get it in small disposable tanks | ||
**Can often be "expired" with this sales model | **Can often be "expired" with this sales model | ||
*Supposedly small issue with excess amonia out of the exhaust if dosage is off (simple control issue) | *Supposedly small issue with excess amonia out of the exhaust if dosage ratio is off (simple control issue) | ||
*May be irrelevant if (near)Stoiceometric Diesel Combustion Can Be Reached (and thus standard [[Catalytic Converter]]s can be used | *May be irrelevant if (near)Stoiceometric Diesel Combustion Can Be Reached (and thus standard [[Catalytic Converter]]s can be used | ||
Latest revision as of 00:55, 9 December 2020
Basics
- Often abbreviated as DEF
- A Consumable Fluid Used for Selective Catalytic Reduction (SCR) systems (essentially wet scrubbers/gas-liquid contactors, but scaled down) mainly on portable diesel engines to reduce NOx emmissions
- Is essentially an aqueous urea solution
- According to wikipedia:
- an aqueous urea solution made with 32.5% urea and 67.5% deionized water
- There are some issues with amonia venting off over time and it thus getting "weaker"
- The injection rate of DEF into the exhaust depends on the specific after-treatment system, but is typically 2–6% of diesel consumption volume
- Commercial Truck Stops Have it "On tap" ie from a pump in most cases
- Most consumers get it in small disposable tanks
- Can often be "expired" with this sales model
- Supposedly small issue with excess amonia out of the exhaust if dosage ratio is off (simple control issue)
- May be irrelevant if (near)Stoiceometric Diesel Combustion Can Be Reached (and thus standard Catalytic Converters can be used
To-Do
- Any way to sense offgassing? Also what sensors are needed, outside of standard oxy-fuel ratio sensors (ie ammonia gas sensor, liquid sensor...)
- DIY Via pelletized/powderized urea? (aggricultural supply, may store better)
- See how far off Stoic Diesel is, if it even is possible