Introduction: Reducing NOx Emissions with Precise DEF Injection
Diesel engines in automotive, marine, and industrial applications produce nitrogen oxide (NOx) emissions, which contribute to air pollution and must comply with stringent environmental regulations like Euro VI, EPA Tier 4, or IMO Tier III. Diesel Dosing Systems inject diesel exhaust fluid (DEF), a 32.5% urea solution, into the exhaust stream to facilitate selective catalytic reduction (SCR), converting NOx into nitrogen and water. Precise dosing and uniform DEF mixing are critical to maximize NOx reduction, minimize urea consumption, and prevent ammonia slip or system clogging due to crystallization.
Premix Technologies, based in Ahmedabad, Gujarat, India, designs advanced Diesel Dosing Systems for NOx emission reduction. Our systems integrate agitators for homogeneous DEF mixing, ensuring accurate dosing to optimize SCR performance. With robust safety features and global standard compliance, we provide reliable solutions for diesel-powered vehicles, marine vessels, and stationary engines.
Why Choose Premix Technologies for Diesel Dosing Systems?
Premix Technologies offers innovative, safe, and efficient DEF dosing solutions, distinguished by:
- Precision Dosing and Mixing for Optimal NOx Reduction
- Accurate DEF Delivery: Our systems dose DEF (0.1-5 mL/s, adjustable) with ±0.5% accuracy, tailored to exhaust flow rates, using API 675-compliant metering pumps.
- Homogeneous Mixing: Integrated agitators with propeller or turbine impellers ensure uniform DEF mixing in storage tanks, preventing urea crystallization or sedimentation.
- Real-Time Control: Inline flow meters and urea quality sensors enable automated dosing adjustments, optimizing NOx reduction (up to 90%) while minimizing ammonia slip (
- Robust Safety and Regulatory Compliance
- Explosion-Proof Design: Certified to ATEX/IECEx Zone 1/2, our systems ensure safe operation in environments with flammable diesel exhaust gases.
- Material Compatibility: Corrosion-resistant materials (e.g., SS316L, HDPE, PTFE) withstand DEF’s corrosive properties, ensuring system durability.
- Safety Mechanisms: Includes pressure relief valves, leak detection, spill containment drip pans, and emergency shutdown (ESD) systems to mitigate risks from DEF handling.
- Industry Standards: Compliant with API 675, ISO 22241 (DEF quality), Euro VI, EPA Tier 4, IMO Tier III, and ISO 9001, ensuring regulatory adherence.
- High Reliability and Operational Efficiency
- Continuous Operation: Engineered for 24/7 performance in demanding applications like heavy-duty vehicles or marine engines, handling exhaust flow rates up to 100,000 Nm³/hr.
- Low Maintenance: Durable components, including robust agitators and modular skids, reduce downtime, with easy access for cleaning to prevent urea buildup.
- Smart Automation: PLC-based controls with SCADA HMI enable real-time monitoring, automated dosing, and remote diagnostics for efficient NOx control.
- Customizable, Turnkey Solutions
- Tailored Design: Systems are customized for specific exhaust flow rates, DEF concentrations, and pressures (up to 10 barg), meeting unique SCR requirements.
- Skid-Mounted Modularity: Compact skids simplify installation and integration into diesel engine exhaust systems, with robust piping for leak-free operation.
- Comprehensive Support: From 3D modeling to commissioning, we provide training, maintenance, and spare parts support for long-term reliability.
Key Applications
Premix Technologies’ Diesel Dosing Systems are vital for:
- Automotive SCR Systems: Reduce NOx in heavy-duty trucks and buses to meet Euro VI and EPA Tier 4 standards.
- Marine Engines: Controls NOx emissions in ship exhausts for compliance with IMO Tier III regulations.
- Stationary Diesel Engines: Enhance NOx reduction in power generation and industrial diesel engines.
- Locomotive Engines: Supports emission control in rail transport diesel systems.
- Construction Equipment: Ensures NOx compliance in off-road machinery like excavators and bulldozers.
Technical Specifications
Our Diesel Dosing Systems are engineered for precision, safety, and durability, with specifications optimized for NOx emission reduction:
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System Component
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Capabilities & Features
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Value for NOx Emission Reduction
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Exhaust Flow Rate
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Up to 100,000 Nm³/hr, customizable
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Supports high-volume SCR systems in diesel engines.
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DEF Dosing Rate
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0.1-5 mL/s, adjustable
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Precise dosing optimizes NOx reduction, minimizing DEF use.
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Storage Tank
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100–5000 L, SS316L or HDPE
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Safe storage for DEF, preventing degradation or crystallization.
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Agitator
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0.18–2 kW motor, propeller/turbine impeller, low RPM
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Ensures homogeneous DEF mixing, preventing urea sedimentation.
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Metering Pump
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Diaphragm, ±0.5% accuracy, API 675-compliant
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Reliable dosing for consistent SCR performance.
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Flow Meter
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Ultrasonic or Coriolis, ±0.2% accuracy
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Accurate flow data ensures precise DEF-to-exhaust ratios.
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Urea Quality Sensor
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Inline, ±0.1% accuracy
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Monitors DEF quality to prevent system clogging.
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Control System
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PLC-based, SCADA HMI, auto-dosing, alarms
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Enables precise, remote operation with safety monitoring.
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Materials
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SS316L, HDPE, PTFE
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Resists DEF corrosion, ensuring longevity.
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Safety Compliance
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ATEX/IECEx Zone 1/2, pressure relief, ESD, spill containment
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Safe handling of DEF in flammable environments.
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Skid Design
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Structural steel or SS, drip pan for spill containment
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Compact, durable for mobile and stationary applications.
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Piping System
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SS316L or HDPE seamless piping, flanged, with check valves
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Ensures leak-free operation and component protection.
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