The DPF initiative regenerating system and regenerating method

Abstract

The invention discloses a DPF initiative regenerating system and a regenerating method, and belongs to the technical field of engine tail gas treatment. The regenerating system comprises a control unit, an LNT device and a DPF device, wherein the LNT device and the DPF device are connected in sequence, and an exhaust pipe of a diesel engine is sequentially connected with the LNT device and the DPFdevice so that the tail gas of the diesel engine can be purified. The regenerating method is carried out in a way that the control unit controls an engine oil sprayer to perform far-back spraying ornot according to temperature of the LNT device and the exhaust back pressure of the DPF device; the control unit controls the engine oil sprayer to perform far-back spraying when the exhaust back pressure of the DPF device and the temperature of the LNT device reach set values, and mixed gas formed by the far-back spraying is quickly discharged into the exhaust pipe; noble metal catalysts in the LNT device is used for oxidizing CO and hydrocarbon compounds at a certain temperature to generate a large amount of heat; and when the high-temperature tail gas passes through the DPF device, particulate matter trapped by the DPF device are combusted so that the purpose of regenerating the DPF device can be achieved.

Description

technical field [0001] The invention belongs to the technical field of engine tail gas treatment, and in particular relates to a DPF active regeneration system and a regeneration method. Background technique [0002] Nitrogen oxides and soot particles are the main harmful substances in diesel engine exhaust emissions. Nitrogen oxides are mainly removed by selective catalytic reduction technology and nitrogen oxide storage and reduction technology, while DPF (diesel particulate filter) is currently used to reduce diesel engine soot particles The most efficient device for emissions. DPF is used to capture the particulate matter in the exhaust gas. As the working time increases, when the particulate matter captured by the DPF reaches a certain amount, the exhaust back pressure of the DPF increases, the exhaust resistance increases, and the power performance and economic performance of the diesel engine decrease significantly. . This requires measures to remove the particulate...

AI Technical Summary

Problems solved by technology

Burner fuel injection heating regeneration needs to provide additional fuel and requires a constant burner temperature; electric heating regeneration has high requirements on the control system and high power consumption, which is not suitable for small and medium power diesel engines; the key to microwave heating regeneration The technology lies in how to excite as many modes as possible in the resonant cavity and control the combustion temperature of the soot particles in the cavity, so as to prevent the filter body from being damaged due to excessive temperature

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