Low-energy diesel engine off-gas treatment system suitable for high exhaust flow

Abstract

The invention discloses a low-energy diesel engine off-gas treatment system suitable for high exhaust flow. The low-energy diesel engine off-gas treatment system comprises a controller and two regeneration systems used alternately, one regeneration system comprises an air supply unit, an ignition unit, a three-way air channel and a packaging unit wrapped with DPF, a fuel oil supply unit is connected to the ignition unit, a first temperature sensor and a second temperature sensor are correspondingly arranged on the upstream and downstream of the DPF, a pressure sensor and a differential pressure sensor are connected to the DPF, and a mass flow sensor is arranged at the outlet of the air supply unit; and the other regeneration system comprises a secondary air channel, a secondary ignition unit, a secondary three-way air channel and a secondary packaging unit wrapped with secondary DPF, a fuel oil supply unit is connected to the secondary ignition unit, a third temperature sensor and a fourth temperature sensor are arranged on the upstream and downstream of the secondary DPF, and a secondary pressure sensor and a secondary differential pressure sensor are connected to the secondary DPF. The low-energy diesel engine off-gas treatment system can regenerate with minimum energy consumption under high exhaust flow.

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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