Diesel Particulate filter (DPF) is a device installed in the exhaust system of diesel vehicles to reduce particulate matter (PM) in the exhaust by filtering. DPF captures particles through a mixture of surface and internal filtration devices, such as diffusion precipitation, inertial precipitation or linear interception, which can effectively purify 70% to 90% of the particles in the exhaust, and is one of the most effective and direct methods for purifying diesel particulate matter, which has been commercialized internationally. In order to meet the emission regulations of Euro VI or the United States 2010, the diesel exhaust post-treatment system will be more complex, and it is necessary to integrate the diesel oxidation catalytic catalytic converter (DOC), diesel particle filter (DPF), selective catalytic reduction device (SCR) and so on to control diesel emissions.
Installation Instructions
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Why replace the diesel particulate filter?
When the engine of a diesel car is running, the exhaust gas from combustion passes through the filter in the DPF, where tiny particles are trapped and larger gas molecules are emitted through the filter. If the engine is running poorly, such as through incomplete combustion, a large amount of carbon will be deposited in the DPF filter and block the intake and exhaust holes of the filter, thereby reducing the filtration efficiency and affecting the engine performance, and eventually the DPF filter needs to be replaced.
The diesel particulate filter (DPF) is a device designed to filter diesel particulate matter (DPM) or soot from exhaust gases. When exhaust gas containing soot enters the DPF, the filter traps anything larger than 1 micron while allowing the gas to pass through. Over time, soot builds up in the DPF, causing the engine control unit (ECU) to detect back pressure that requires regeneration. The coating and substrate combine high temperatures with a mixture of precious metals to turn the soot into ash, making the DPF regenerated and ready for use. Our high-quality diesel particulate filters, with cordierite walls flowing through filters, capture substances larger than 1 micron and are protected by a stainless steel metal housing to withstand extreme temperatures.
DPF INTRODUCTION
DPF is the only option to satisfy particle number emissions. Common DPF support materials are ceramics, aluminum titanate and silicon carbide. The choice of carrier material is mainly based on the use of DPF and regeneration strategy, including carbon back pressure, filtration efficiency, regeneration temperature, time and so on. All three carriers are now on the market. Our DPF coating technologies are based on a high thermal stable wash coat formulation with excellent NO2 formation.
DOC INTRODUCTION
DOC is one of the most important catalysts for diesel engine reprocessing. Its main function is to oxidize the unburned hydrocarbons (HC) in the engine and the carbon monoxide (CO) produced during combustion into harmless water and carbon dioxide. At the same time, it can also convert NO into NO2 for passive regeneration of downstream catalyst particle trap (CDPF) and improve NOx conversion efficiency of SCR. Depending on the emission requirements, it is sometimes necessary to integrate multiple functions on DOC, which also brings great challenges to the design of DOC. We can provide the following conventional DOC products, but also according to the customer's engine emissions input to provide customized DOC products.
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