Engine vent gas purification system with front and rear catalysis bodies and utilization of waste gas secondary combustion

Abstract

The invention discloses an engine exhaust gas purification system which adopts exhaust gas re-combustion and is provided with a pre-catalysis body and a post- catalysis body. Though the existing engine exhaust pipes all apply catalysts to purify, the engine exhaust gas can not be completely purified and cleared up. The invention is provided with an exhaust gas inlet pipe, a pre-catalysis body and a post-catalysis body; the exhaust gas discharge can meet a higher standard after the three process steps of exhaust gas re-combustion, the pre-catalysis and the post-catalysis; on one hand, the incompletely combusted fuel and hot gas in the exhaust gas can be fully used, on the other hand, the key component in the exhaust gas can be individually pre-purified in a target-oriented way to reduce the work load of the post-catalysis body, thus the discharge standard of the exhaust gas is enhanced, the exhaust discharge amount is reduced to be close to zero discharge.

Description

technical field [0001] The invention relates to an engine exhaust gas purification system, in particular to an engine exhaust gas purification system capable of reburning exhaust gas and having front and rear catalytic bodies. Background technique [0002] Engine exhaust emission is one of the main sources of environmental pollution. The main components of engine exhaust are incompletely combusted combustible particles, sulfides, carbon monoxide, carbon dioxide, hydrocarbons, nitrogen oxides and other mixed exhaust gases. In order to reduce the emission of these exhaust gases Emissions, people use catalytic technology, use the catalyst in the catalytic body to purify the exhaust gas of the engine, convert the harmful substances in the exhaust gas into harmless substances and then discharge them, thereby reducing the emission of exhaust gas. What plays a good role in the catalytic conversion of these exhaust gases is the rare earth element composite catalyst added with precio...

AI Technical Summary

Problems solved by technology

Although the current engine exhaust pipes have adopted catalyst purification measures, the exhaust gas of the engine cannot be completely purified and eliminated.

This is mainly because the exhaust pipes currently used all adopt the method of one-time exhaust, and the exhaust gas discharged from the engine cannot be fully utilized, especially the incompletely combusted combustible particles in the exhaust gas are not fully utilized, and are discharged as exhaust gas. On the one hand, it increases the emission of exhaust gas and increases the workload of the catalyst. On the other hand, it is a waste that combustible particles cannot be used.

Secondly, precious metal palladium, platinum, rhodium coating and integrated rare earth composite catalysts cannot focus on one-sided exhaust gas treatment, and are not very targeted to a certain key component in exhaust gas. Partially effective, but not ideal

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