Diesel Engine Test Bed Exhaust Gas Purification Solution — DOC + Black Smoke Purifier + SCR Denitrification

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Hebei Hanlan delivers integrated DOC + black smoke purifier + SCR solutions for diesel engine test beds, ensuring NOx, CO, HC and PM removal with low backpressure, long service life and no secondary pollution.

Application Scenario
Diesel engine test beds generate substantial exhaust emissions during testing, containing nitrogen oxides (NOx), carbon monoxide (CO), non-methane hydrocarbons (NMHC), and soot particulate matter (PM). These emissions must be effectively treated to meet stringent environmental standards before discharge.

The Challenge
Engine test bed exhaust presents unique purification challenges. The flue gas contains oil mist and black smoke particles that can clog catalysts and DOC units, significantly reducing purification efficiency and equipment lifespan. Additionally, test beds operate under highly variable load conditions, requiring a purification system that remains stable and effective across the full operating range.

Integrated Solution
Hebei Hanlan provides a complete, integrated exhaust gas purification system specifically engineered for diesel engine test beds. The system combines three core treatment stages:
DOC Oxidation Catalyst Unit — Removes carbon monoxide (CO) and hydrocarbons (HC) from the exhaust stream.
Automatic Self-Cleaning Black Smoke Purifier — Captures and removes soot particulate matter (PM) while automatically purging accumulated particles, reducing operator maintenance workload.
SCR Denitrification System — Utilizes selective catalytic reduction technology with urea solution as the reducing agent to convert NOx into harmless nitrogen (N₂) and water (H₂O).
The complete system also includes urea storage tanks and a precision control and metering system.

Key Advantages
Low Backpressure: Exhaust backpressure at 100 mm from the engine outlet is ≤5 kPa, ensuring minimal impact on engine performance.
No Additional Heating Required: The system operates effectively under existing exhaust temperature conditions without supplementary heating.
Noise Compliance: The equipment operates within Class II noise requirements during stable operation.
Compact and Accessible Design: Optimized equipment layout reduces floor space while providing convenient access for operation, maintenance, and inspection. Walkways and access platforms are installed where required.
Built for Continuous Operation: Corrosion-resistant housing and robust construction ensure long service life under continuous operation.
Comprehensive Monitoring: Sampling ports for both raw exhaust and treated exhaust are provided for regulatory testing and performance verification.
No Secondary Pollution: The purification process generates no secondary pollutants.

Project Delivery
Hebei Hanlan provides end-to-end project execution for test bed exhaust treatment, covering system design, manufacturing, packaging, transportation, equipment inspection, on-site installation, operator training, commissioning, and after-sales service. Installation positioning is optimized based on actual site conditions and confirmed by the client prior to execution.

Project Outcome
A diesel engine test bed exhaust treatment project delivered by Hebei Hanlan successfully passed acceptance testing, with all treated exhaust emissions meeting discharge standards. The system effectively eliminated visible black smoke at the stack outlet while maintaining stable, continuous operation. The client expressed full satisfaction with the system performance and project delivery.