Diesel particulate filter (DPF) and diesel engine

Abstract

The invention provides a diesel particulate filter (DPF). The diesel particulate filter comprises an entryway. The front end of the entryway is coated with a first catalyst coating, the rear end of the entryway is coated with a second catalyst coating, and activity of the first catalyst coating is higher than activity of the second catalyst coating. When the number of caught particulates achieves a certain number, the DPF starts to regenerate; and due to the fact that the activity of the second catalyst coating at the rear end of the entryway is higher than the activity of the first catalyst coating at the front end of the entryway, the particulates at the rear end of the entryway is more easier to regenerate, and exhaust resistance is lowered firstly. Subsequent airflows and energy and active ingredients carried by the subsequent airflows can flow through un-regenerated particulate layers, so that regeneration of the DPF can cover the whole entryway; and generation efficiency of the DPF is guaranteed, generation reliability of the DPF is improved, and the service life of the DPF is improved. Meanwhile, exhaust resistance is reduced, and oil consumption of a diesel engine is lowered. The invention further provides the diesel engine.

Description

technical field [0001] The present invention relates to the technical field of diesel engine exhaust gas treatment, and more specifically relates to a diesel particle catcher, and also relates to a diesel engine with the above-mentioned diesel particle catcher. Background technique [0002] DPF (abbreviation for Diesel Particulate Filter, Diesel Particulate Filter) is a ceramic filter installed in the exhaust system of a diesel engine, which can capture PM emissions before they enter the atmosphere, thereby reducing engine particulate emissions . When the particles captured by the DPF reach a certain limit, it is necessary to remove the particles of the DPF through technical means to realize the recycling of the DPF. [0003] During the use of DPF, affected by the flow direction of the exhaust gas, the temperature of the exhaust gas in the inlet channel of the DPF decreases with the increase of the inlet depth. DPF regeneration is easier to occur first at the front end of t...

AI Technical Summary

Problems solved by technology

However, the rear end of the inlet channel cannot receive subsequent airflow and energy supplementation, and regeneration cannot be performed, resulting in incomplete regeneration of the DPF as a whole; after several regenerations, particles will accumulate at the rear end of the inlet channel, resulting in a shortened effective length of the DPF and exhaust back pressure. The increase will increase the fuel consumption of the diesel engine. In severe cases, the DPF will be completely blocked and scrapped, which will affect the service life of the DPF.

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