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What is the urea injector?

2025-09-17

The ‌urea injector‌ is a critical component of the ‌Selective Catalytic Reduction (SCR)‌ system in diesel engines, designed to reduce nitrogen oxide (NOx) emissions by precisely spraying ‌urea solution (DEF, Diesel Exhaust Fluid)‌ into the exhaust stream. Here’s a detailed breakdown:

 

Function & Working Principle

  1. Precision Injection‌: The injector atomizes urea solution (32.5% urea + 67.5% deionized water) into the exhaust pipe under ECU control, ensuring optimal reaction with NOx in the SCR catalyst‌12.
  2. Chemical Reaction‌: Urea decomposes into ‌ammonia (NH₃)‌ at high temperatures, which reacts with NOx to form harmless nitrogen (N₂) and water (H₂O)‌13.
  3. System Integration‌: Works with sensors (e.g., NOx sensors) and the SCR catalytic converter to maintain emission compliance‌3.
  4. Key Features

  5. Durability‌: Made from corrosion-resistant materials to withstand harsh exhaust conditions‌2.
  6. Control‌: Adjusts spray volume and timing based on engine load, speed, and exhaust temperature‌3.
  7. Applications

  8. Heavy-duty vehicles‌ (trucks, buses) and ‌industrial diesel engines‌ to meet emission standards like Euro VI or China VI‌12.
  9. Maintenance Considerations

  10. Clogging Risk‌: Poor-quality urea or improper maintenance can block the injector, leading to reduced engine power or system failure‌34.
  11. Professional Service‌: Recommended for installation/replacement due to precision requirements‌45.
  12. For a visual guide, see:

    For deeper technical insights, consult SCR system manuals or manufacturer specifications‌

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Détails des nouvelles
À la maison > Nouvelles >

Actualités de l'entreprise concernant-What is the urea injector?

What is the urea injector?

2025-09-17

The ‌urea injector‌ is a critical component of the ‌Selective Catalytic Reduction (SCR)‌ system in diesel engines, designed to reduce nitrogen oxide (NOx) emissions by precisely spraying ‌urea solution (DEF, Diesel Exhaust Fluid)‌ into the exhaust stream. Here’s a detailed breakdown:

 

Function & Working Principle

  1. Precision Injection‌: The injector atomizes urea solution (32.5% urea + 67.5% deionized water) into the exhaust pipe under ECU control, ensuring optimal reaction with NOx in the SCR catalyst‌12.
  2. Chemical Reaction‌: Urea decomposes into ‌ammonia (NH₃)‌ at high temperatures, which reacts with NOx to form harmless nitrogen (N₂) and water (H₂O)‌13.
  3. System Integration‌: Works with sensors (e.g., NOx sensors) and the SCR catalytic converter to maintain emission compliance‌3.
  4. Key Features

  5. Durability‌: Made from corrosion-resistant materials to withstand harsh exhaust conditions‌2.
  6. Control‌: Adjusts spray volume and timing based on engine load, speed, and exhaust temperature‌3.
  7. Applications

  8. Heavy-duty vehicles‌ (trucks, buses) and ‌industrial diesel engines‌ to meet emission standards like Euro VI or China VI‌12.
  9. Maintenance Considerations

  10. Clogging Risk‌: Poor-quality urea or improper maintenance can block the injector, leading to reduced engine power or system failure‌34.
  11. Professional Service‌: Recommended for installation/replacement due to precision requirements‌45.
  12. For a visual guide, see:

    For deeper technical insights, consult SCR system manuals or manufacturer specifications‌