Green Valley DOCF+SCR | The innovative choice of diesel generator exhaust purification ​

With increasingly stringent national environmental regulations, emission control standards for particulate matter (PM) and nitrogen oxides (NOx) in diesel engine exhaust have become more rigorous. Diesel generator exhaust treatment has long faced multiple challenges: traditional equipment struggles to effectively manage both PM and NOx simultaneously, while DPF clogging occurs frequently, SCR denitrification efficiency fluctuates, and ammonia slip corrosion increases hidden costs through frequent filter replacements. Conventional purification systems cannot effectively address multiple pollutants simultaneously. Green Valley Environmental Protection’s DOCF+SCR synergistic purification system addresses these challenges by achieving both high-efficiency purification and low-cost operation, providing an innovative, reliable, and highly efficient exhaust treatment solution for diesel generators across various industries.​

The DOCF+SCR of Green Valley Environmental Protection is a system integrating diesel oxidation catalytic capture technology (DOCF) and selective catalytic reduction technology (SCR). Based on the deep coordination of pollutant treatment logic, it forms a multi-dimensional treatment scheme of “first removing particles, then reducing nitrogen and oxygen”.

DOCF: Pre-purification to clear the obstacles for SCR​

As the “first line of defense” in exhaust purification, Green Valley Environmental Protection’s DOCF (Diesel Oxidation Catalyst + Particulate Collector Integrated System) plays a core role in pretreatment and particulate removal. First, the DOC (Diesel Oxidation Catalyst) oxidizes CO and HC in exhaust into harmless CO₂ and H₂O, while partially converting NO into NO₂ to create conditions for subsequent SCR reactions. Then, the DPF (Diesel Particulate Collector) captures over 95% of PM particles through high-precision metal filter elements, preventing blockage of SCR catalyst pores and ensuring long-term stable operation of the SCR system, thereby extending catalyst lifespan.​

SCR: precision denitration, conquer the problem of NOx emission ​

The purified exhaust gas undergoes DOFC pretreatment before entering the SCR denitrification system, where nitrogen oxides (NOx) are processed. By precisely spraying urea solution under the catalytic action, the SCR system selectively reacts NOx (NO and NO₂) with NH₃ (urea decomposition products), generating harmless N₂ and H₂O. This achieves a denitrification efficiency exceeding 95%, effectively reducing NOx emissions from thousands of mg/m³N to below 50mg/m³N, meeting both National VI and stricter environmental standards.​.

From pretreatment to deep purification, DOCF and SCR form a seamless treatment chain, which not only avoids the interference of particulate matter on SCR, but also improves the denitration efficiency of SCR through DOC and NO₂ generation, truly realizing the synergistic value of “1+1>2″.

For instance, in high-stability-demand environments like data centers and computing hubs, diesel generators emit large volumes of complex exhaust gases during operation. Traditional exhaust purification systems face challenges with high maintenance costs and frequent malfunctions. The Green Valley DOCF+SCR integrated system effectively purifies emissions while ensuring stable generator performance. This innovation not only resolves emission concerns but also maintains uninterrupted power supply, establishing an eco-friendly safeguard for secure data storage and efficient computing operations.

 Weichai Chile USA Project

Type: DOCF+SCR

Model: GRVNES80-ZT-20

Model: 2420KW unit

NOx decreased from 4.9g/kwh to 0.67g/kwh​

In order to achieve the “particulate matter + nitrogen oxide” emission standards, and to cope with more stringent environmental regulations in the future, Green Valley Environmental Protection will continue to promote green development through technological innovation, and jointly protect the blue sky, clear water and clean land.