A dpf regeneration system and control method

Abstract

The invention provides a DPF regenerating system and a control method. The system mainly comprises an NTP injection system, a double-DPF system, a heat-to-electricity conversion device and a control module. Air is used as an air source of the NTP injection system, an NTP generator discharges to generate active substances, and the active substances are sprayed out via a nozzle mounted at the front end of each DPF, and enter each DPF to be regenerated. The double-DPF system comprises two DPFs which are connected in parallel, and a diesel engine can run normally during on-line alternate DPF regeneration of the NTP injection system. The heat-to-electricity conversion device controls the temperature of the DPFs by using electric heating layers which wrap DPF shells, so that the DPFs are at optimal regeneration temperature. The NTP injection system, the double-DPF system and the heat-to-electricity conversion device are connected with the control module. In a running state of the diesel engine, on-line real-time DPF regeneration can be realized, and the problem that NTP utilization rate is reduced due to over large exhaust flow is solved effectively.

Description

technical field [0001] The invention relates to the technical field of post-treatment of diesel engine exhaust, in particular to a DPF regeneration system and a control method. Background technique [0002] Due to its good fuel economy, high reliability, high thermal efficiency and long service life, diesel engines are widely used in transportation, industrial and agricultural production and other fields. The main pollutants emitted by diesel engines are nitrogen oxides NO X And particulate matter (PM for short), especially PM, seriously endanger human health. In recent years, increasingly stringent emission regulations have put forward higher requirements on PM emissions from diesel engines. Diesel particulate filter (DPF for short) technology is considered to be the most effective post-treatment method to reduce PM at present, and the collection efficiency can reach more than 90%. However, as the DPF continues to capture PM in the exhaust, the DPF will be blocked, which...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that the DPF cannot be regenerated online in real time, and an effective online regeneration strategy cannot be provided for the DPF system with diesel engines running for a long time

However, the disadvantage of this method is that the exhaust flow rate is much greater than the NTP flow rate during online regeneration, and this method fails to solve the problems of decreased NTP utilization rate and low regeneration efficiency.

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