Low energy consumption diesel engine exhaust treatment system suitable for high exhaust flow

Abstract

The invention discloses a low energy consumption diesel engine tail gas treatment system suitable for high exhaust flow rate, which includes a controller and two alternately used regeneration systems, one system includes an air supply unit, an ignition unit, a three-way air channel and wrapped with The packaging unit of DPF, the fuel supply unit is connected to the ignition unit, the first temperature sensor and the second temperature sensor are arranged on the upstream and downstream of the DPF, the pressure sensor and the differential pressure sensor are connected to the DPF, and the outlet of the air supply unit is equipped with a mass flow sensor; another system includes auxiliary air channel, auxiliary ignition unit, auxiliary three-way air channel and auxiliary packaging unit wrapped with auxiliary DPF. The auxiliary ignition unit is connected with a fuel supply unit, and the upstream and downstream of the auxiliary DPF are provided with a third The temperature sensor and the fourth temperature sensor are connected to the auxiliary DPF with an auxiliary pressure sensor and an auxiliary differential pressure sensor. The present invention enables regeneration at high exhaust flow rates with minimal energy consumption.

Description

technical field [0001] The invention relates to a tail gas treatment system, in particular to a low energy consumption diesel engine tail gas treatment system suitable for high exhaust flow. Background technique [0002] Engine exhaust has been identified as a major contributor to air pollution. In order to remove air pollutants in the exhaust gas, an exhaust gas treatment system is required. Diesel particulate filters (DPFs) are commonly used in exhaust treatment systems to capture particulate matter (PM), which may include unburned hydrocarbon particles or soot and small amounts of other particles such as metal oxide particles or ash. PM particles accumulate in the DPF, increasing the engine back pressure, and before the engine back pressure becomes too high, a regeneration process is required to remove the accumulated soot. [0003] Typically, during regeneration, a heating device is used to raise the temperature of the exhaust gas to a level where the soot can be effec...

AI Technical Summary

Problems solved by technology

However, DOC requires a higher PGM (precious metal) load, and only when the exhaust gas temperature is higher than the light-off temperature (usually higher than 200 ° C), the metered injection of fuel can only be started

At the same time, the PGM in DOC is sensitive to the sulfur content in fuel oil, because the high sulfur content in the exhaust gas can poison and make the PGM catalyst ineffective

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