Diesel engine tail gas filter

Abstract

The invention relates to a diesel engine tail gas filter. The diesel engine tail gas filter comprises a filter tank (1), wherein an oxidized type catalytic converter (2) and a ceramic honeycomb carrier (3) are arranged in the filter tank (1) along airflow; the inner surface of the filter tank (1) is coated with a silicon dioxide heat insulation coating; the outer surfaces of the oxidized type catalytic converter (2) and the ceramic honeycomb carrier (3) are provided with heat insulation shock absorption layers (7); and a spray head (9) is also arranged at the front end of the filter tank (1). The diesel engine tail gas filter has the beneficial effects that firstly acidic components in tail gases are eliminated by using sodium carbonate water mist, then the tail gases comprising CO, HC, NOx which are main components react to form CO2, H2O, N2 and O2 through the two-stage filtration of the ceramic honeycomb carrier and the oxidized type catalytic converter, and meanwhile the soot particles in waste gases can be effectively filtered by micropores on partition walls and are burned under the effect of a catalyst coating, thereby further improving a tail gas purification effect.

Description

technical field [0001] The invention relates to a diesel exhaust filter, which is used for purifying automobile exhaust. It belongs to the technical field of automobile equipment. Background technique [0002] At present, ordinary automotive diesel exhaust filters emit pollutants containing soot particulate matter (PM), hydrocarbons (HC), CO and NO x Wait. Because of the O in the exhaust 2 The content is higher, so the HC and CO emissions are less, generally only 1 / 10 of gasoline engines, NO x The emission is roughly the same as that of a gasoline engine, while the emission of PM is about dozens of times that of a gasoline engine. Therefore, the existing diesel engine exhaust filter cannot effectively filter soot particles, so that the exhaust exhaust will have a lot of black smoke, causing environmental pollution; now The further elimination of the acidic components of some exhaust gases is a new demand for exhaust gas treatment and urban environmental protection. Co...

AI Technical Summary

Problems solved by technology

Because of the O in the exhaust 2 The content is higher, so the HC and CO emissions are less, generally only 1 / 10 of gasoline engines, NO x The emission is roughly the same as that of a gasoline engine, while the emission of PM is about dozens of times that of a gasoline engine. Therefore, the existing diesel engine exhaust filter cannot effectively filter soot particles, so that the exhaust exhaust will have a lot of black smoke, causing environmental pollution; now The further elimination of the acidic components of some exhaust gases is a new demand for exhaust gas treatment and urban environmental protection.

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