Dual Reduction Post Treament for Diesel Engine DOC DPF SCR
According to the requirements of transformation and treatment of in-service diesel vehicle market, the product should meet not only the requirementsof reducing particulate matter (PM) in exhaust gas, but also meet therequirements of reducing nitrogen oxides (NOx). Therefore, Sinocat has specially developed a dual reduction post-treatment for diesel engine DOC DPF SCR system to better satisfy market demand.
Working Principle of Post Treatment for Diesel Engine DOC DPF SCR
Sinocat has successfully developed a DOC+CDPF+SCR dual reduction post-treatment product by integrating Diesel Oxidation Catalyst (DOC), Diesel Particulate Filter (DPF), and NOx Selective Catalytic Reduction (SCR) (a catalytic converter with a precious metal catalyst coated on a DPF carrier, namely CDPF). On the one hand, the DOC in this product oxidizes NO to NO2 in an appropriate temperature range, providing sufficient NO2 for the downstream CDPF to achieve passive regeneration smoothly, while also supplying NO2 for the rapid reduction reaction for SCR. On the other hand, by using excellent fuel ignitability of DOC, CDPF’s active regeneration can be realized smoothly, improving CDPF’s active regeneration efficiency, reducing fuel consumption, therefore booting economic efficiency of fuel.
The DOC+CDPF+SCR system integrates numerous modern high technologies such as precious metal catalysts for diesel automobiles, selective catalytic reduction technology, polymer ceramic materials, high-precision sensor technology, SCR injection control technology and online supervision and alarm technology. It is the industry-leading product of China’s road diesel exhaust emission control technology.
The product monitors the internal working conditions of the system in real time through temperature and pressure sensors, and uploads the informations to the monitoring platform of the modified vehicle. At the same time, it precisely controls the treatment of NOx through multiple temperature and nitrogen-oxygen sensors, gas flow or speed sensors
By optimizing the integrated system of DOC+CDPF+SCR, the CO, HC, NOx and PM in exhaust gas of reformed diesel engine are significantly reduced and meet emission requirements. After the product is installed, fuel consumption increases by no more than 5% and urea consumption will not exceed 5% of fuel consumption.