Hebei Hanlan Delivers Generator Exhaust Purification Project, Achieving U.S. Tier 4 Emission Standar

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Recently, Hebei Hanlan Environmental Technology Co., Ltd. (hereinafter referred to as "Hebei Hanlan") has made significant strides in both domestic and international markets: its 1000KW diesel generator set exhaust gas purifier, customized for an overseas client, has been successfully delivered and accepted. The project successfully treated the exhaust emissions of the generator set to meet the stringent U.S. Tier 4 standards.

The project aimed to address the high initial emissions of the client’s existing 1000KW diesel generator set. Hebei Hanlan provided a comprehensive "turnkey" service, covering the entire process from core equipment design, production and manufacturing, domestic and international transport, to on-site commissioning and operational training. The scope of supply fully covered the entire exhaust treatment process, from the intake flange of the black smoke purifier to the exhaust flange of the SCR reactor.

Facing technical challenges, Hebei Hanlan’s technical team precisely customized an efficient and cost-effective solution for the client. The system integrated two core modules: an economical diesel particulate filter (DPF) for efficiently removing particulate matter (PM) and a Selective Catalytic Reduction (SCR) system for accurately reducing nitrogen oxides (NOx). Under operating conditions where the generator set exhaust parameters (e.g., 300-450°C working temperature) met design requirements, the system operated stably and treated the emissions effectively. Final testing showed that the purified exhaust emissions were stable at NOx: 0.67g/kw.h and PM: 0.03g/kw.h, meeting the U.S. Tier 4 emission standards and successfully passing the project acceptance.

Despite initial challenges such as high initial pollutant concentrations in the exhaust, the successful achievement of the expected environmental goals was made possible through close consultation, detailed communication, and collaboration between the two parties. The successful collaboration has garnered high recognition and praise from the client, thanks to the superior purification results that exceeded expectations.

This success not only highlights Hebei Hanlan’s technical strength in the field of internal combustion engine exhaust gas treatment but also lays a solid foundation for further expansion into both domestic and international markets. Hebei Hanlan will continue to uphold its customer-centered philosophy, offering professional customized solutions to contribute to global customers' green and sustainable industrial development.

Appendix: About Tier 4
The U.S. Tier 4 standards are the most stringent non-road diesel engine emission regulations set by the U.S. Environmental Protection Agency (EPA). They require a significant reduction in nitrogen oxides and particulate matter emissions, achieved through complex technologies such as DPF and SCR. These standards are an important driver for advancing diesel engine technology toward cleaner and more environmentally friendly solutions.

What is Tier 4?
Tier 4 is the most stringent level in the EPA’s series of non-road diesel engine emission standards. The series starts with Tier 1 and gradually becomes more stringent, aiming to significantly reduce diesel engine emissions and improve air quality and public health.

Applicable Scope: It mainly applies to non-road equipment, such as:
Construction machinery: excavators, bulldozers, loaders, cranes
Agricultural machinery: tractors, harvesters
Industrial equipment: forklifts, air compressors, generator sets
Others: forestry equipment, airport ground support equipment, etc.
Note: It does not apply to on-road vehicles like passenger cars, trucks, and buses, which are subject to separate standards like "EPA 2010."

What Pollutants Does Tier 4 Control?
The Tier 4 standards set strict limits on the emissions of the following harmful substances:
Nitrogen oxides (NOx): Major contributors to smog and acid rain.
Particulate matter (PM): Commonly known as "black smoke," which consists of fine carbon particles visible to the naked eye and poses significant health risks to the lungs.
Hydrocarbons (HC): Unburned fuel, a precursor to ozone formation.
Carbon monoxide (CO): A toxic gas that inhibits the delivery of oxygen in the blood.
Compared to the earlier Tier 3 standards, Tier 4 requirements are extremely stringent:
Particulate matter (PM) emissions must be reduced by approximately 90%.
Nitrogen oxides (NOx) emissions must be reduced by approximately 90%.

Implementation Timeline of Tier 4
The Tier 4 standards are implemented in stages, based on engine power output:
Tier 4 Final (Final Stage): For high-power engines above 175 horsepower, mandatory implementation began on January 1, 2015.
For lower-power engines, the implementation started earlier (e.g., 2013-2014).
All newly manufactured non-road equipment with engines on the market must meet the Tier 4 Final standards.

How Do Manufacturers Meet Tier 4 Standards?
To meet such stringent emission limits, engine manufacturers must adopt advanced exhaust aftertreatment technologies, usually a combination of solutions:
diesel particulate filter (DPF): Captures and collects particulate matter (PM), effectively eliminating black smoke.
Selective Catalytic Reduction (SCR): Injects a reductant called Diesel Exhaust Fluid (DEF) into the exhaust stream to convert harmful nitrogen oxides (NOx) into harmless nitrogen (N₂) and water (H₂O).
Exhaust gas recirculation (EGR): Recirculates part of the exhaust gas back into the cylinders to lower combustion temperatures and reduce NOx formation.
Diesel oxidation catalyst (DOC): Converts carbon monoxide (CO) and hydrocarbons (HC) into carbon dioxide (CO₂) and water (H₂O).

Impact on Users: The main change for users is the need to regularly add DEF fluid, and the DPF system may require periodic "regeneration" to burn off accumulated particulate matter.